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<div class="headertitle"><div class="title">MFCC Q31<div class="ingroups"><a class="el" href="group__groupTransforms.html">Transform Functions</a> » <a class="el" href="group__MFCC.html">MFCC</a></div></div></div>
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a id="func-members" name="func-members"></a>
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Functions</h2></td></tr>
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<tr class="memitem:ga758406a367635b2878ea1f59107087db"><td class="memItemLeft" align="right" valign="top"><a class="el" href="arm__math__types_8h.html#a5e459c6409dfcd2927bb8a57491d7cf6">arm_status</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__MFCCQ31.html#ga758406a367635b2878ea1f59107087db">arm_mfcc_init_q31</a> (<a class="el" href="structarm__mfcc__instance__q31.html">arm_mfcc_instance_q31</a> *S, uint32_t fftLen, uint32_t nbMelFilters, uint32_t nbDctOutputs, const <a class="el" href="arm__math__types_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> *dctCoefs, const uint32_t *filterPos, const uint32_t *filterLengths, const <a class="el" href="arm__math__types_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> *filterCoefs, const <a class="el" href="arm__math__types_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> *windowCoefs)</td></tr>
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<tr class="memdesc:ga758406a367635b2878ea1f59107087db"><td class="mdescLeft"> </td><td class="mdescRight">Generic initialization of the MFCC Q31 instance structure. <a href="group__MFCCQ31.html#ga758406a367635b2878ea1f59107087db">More...</a><br /></td></tr>
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<tr class="separator:ga758406a367635b2878ea1f59107087db"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:gaf600d13d2afb6575c08c98371a36d88c"><td class="memItemLeft" align="right" valign="top"><a class="el" href="arm__math__types_8h.html#a5e459c6409dfcd2927bb8a57491d7cf6">arm_status</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__MFCCQ31.html#gaf600d13d2afb6575c08c98371a36d88c">arm_mfcc_init_32_q31</a> (<a class="el" href="structarm__mfcc__instance__q31.html">arm_mfcc_instance_q31</a> *S, uint32_t nbMelFilters, uint32_t nbDctOutputs, const <a class="el" href="arm__math__types_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> *dctCoefs, const uint32_t *filterPos, const uint32_t *filterLengths, const <a class="el" href="arm__math__types_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> *filterCoefs, const <a class="el" href="arm__math__types_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> *windowCoefs)</td></tr>
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<tr class="memdesc:gaf600d13d2afb6575c08c98371a36d88c"><td class="mdescLeft"> </td><td class="mdescRight">Initialization of the MFCC Q31 instance structure for 32 sample MFCC. <a href="group__MFCCQ31.html#gaf600d13d2afb6575c08c98371a36d88c">More...</a><br /></td></tr>
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<tr class="separator:gaf600d13d2afb6575c08c98371a36d88c"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:gab2f377799d0d6c524fbdd3b21618a90a"><td class="memItemLeft" align="right" valign="top"><a class="el" href="arm__math__types_8h.html#a5e459c6409dfcd2927bb8a57491d7cf6">arm_status</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__MFCCQ31.html#gab2f377799d0d6c524fbdd3b21618a90a">arm_mfcc_init_64_q31</a> (<a class="el" href="structarm__mfcc__instance__q31.html">arm_mfcc_instance_q31</a> *S, uint32_t nbMelFilters, uint32_t nbDctOutputs, const <a class="el" href="arm__math__types_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> *dctCoefs, const uint32_t *filterPos, const uint32_t *filterLengths, const <a class="el" href="arm__math__types_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> *filterCoefs, const <a class="el" href="arm__math__types_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> *windowCoefs)</td></tr>
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<tr class="memdesc:gab2f377799d0d6c524fbdd3b21618a90a"><td class="mdescLeft"> </td><td class="mdescRight">Initialization of the MFCC Q31 instance structure for 64 sample MFCC. <a href="group__MFCCQ31.html#gab2f377799d0d6c524fbdd3b21618a90a">More...</a><br /></td></tr>
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<tr class="separator:gab2f377799d0d6c524fbdd3b21618a90a"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:ga742e2526ceeb559832769d20ca51a568"><td class="memItemLeft" align="right" valign="top"><a class="el" href="arm__math__types_8h.html#a5e459c6409dfcd2927bb8a57491d7cf6">arm_status</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__MFCCQ31.html#ga742e2526ceeb559832769d20ca51a568">arm_mfcc_init_128_q31</a> (<a class="el" href="structarm__mfcc__instance__q31.html">arm_mfcc_instance_q31</a> *S, uint32_t nbMelFilters, uint32_t nbDctOutputs, const <a class="el" href="arm__math__types_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> *dctCoefs, const uint32_t *filterPos, const uint32_t *filterLengths, const <a class="el" href="arm__math__types_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> *filterCoefs, const <a class="el" href="arm__math__types_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> *windowCoefs)</td></tr>
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<tr class="memdesc:ga742e2526ceeb559832769d20ca51a568"><td class="mdescLeft"> </td><td class="mdescRight">Initialization of the MFCC Q31 instance structure for 128 sample MFCC. <a href="group__MFCCQ31.html#ga742e2526ceeb559832769d20ca51a568">More...</a><br /></td></tr>
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<tr class="separator:ga742e2526ceeb559832769d20ca51a568"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:gab27a895d360c8ee12f0bde2ec0ff7c98"><td class="memItemLeft" align="right" valign="top"><a class="el" href="arm__math__types_8h.html#a5e459c6409dfcd2927bb8a57491d7cf6">arm_status</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__MFCCQ31.html#gab27a895d360c8ee12f0bde2ec0ff7c98">arm_mfcc_init_256_q31</a> (<a class="el" href="structarm__mfcc__instance__q31.html">arm_mfcc_instance_q31</a> *S, uint32_t nbMelFilters, uint32_t nbDctOutputs, const <a class="el" href="arm__math__types_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> *dctCoefs, const uint32_t *filterPos, const uint32_t *filterLengths, const <a class="el" href="arm__math__types_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> *filterCoefs, const <a class="el" href="arm__math__types_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> *windowCoefs)</td></tr>
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<tr class="memdesc:gab27a895d360c8ee12f0bde2ec0ff7c98"><td class="mdescLeft"> </td><td class="mdescRight">Initialization of the MFCC Q31 instance structure for 256 sample MFCC. <a href="group__MFCCQ31.html#gab27a895d360c8ee12f0bde2ec0ff7c98">More...</a><br /></td></tr>
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<tr class="separator:gab27a895d360c8ee12f0bde2ec0ff7c98"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:gae1b3d5cd7b77def16e1b4c6b0ab2984e"><td class="memItemLeft" align="right" valign="top"><a class="el" href="arm__math__types_8h.html#a5e459c6409dfcd2927bb8a57491d7cf6">arm_status</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__MFCCQ31.html#gae1b3d5cd7b77def16e1b4c6b0ab2984e">arm_mfcc_init_512_q31</a> (<a class="el" href="structarm__mfcc__instance__q31.html">arm_mfcc_instance_q31</a> *S, uint32_t nbMelFilters, uint32_t nbDctOutputs, const <a class="el" href="arm__math__types_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> *dctCoefs, const uint32_t *filterPos, const uint32_t *filterLengths, const <a class="el" href="arm__math__types_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> *filterCoefs, const <a class="el" href="arm__math__types_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> *windowCoefs)</td></tr>
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<tr class="memdesc:gae1b3d5cd7b77def16e1b4c6b0ab2984e"><td class="mdescLeft"> </td><td class="mdescRight">Initialization of the MFCC Q31 instance structure for 512 sample MFCC. <a href="group__MFCCQ31.html#gae1b3d5cd7b77def16e1b4c6b0ab2984e">More...</a><br /></td></tr>
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<tr class="separator:gae1b3d5cd7b77def16e1b4c6b0ab2984e"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:gabe57572879701c8f2e89497d9d99d2ca"><td class="memItemLeft" align="right" valign="top"><a class="el" href="arm__math__types_8h.html#a5e459c6409dfcd2927bb8a57491d7cf6">arm_status</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__MFCCQ31.html#gabe57572879701c8f2e89497d9d99d2ca">arm_mfcc_init_1024_q31</a> (<a class="el" href="structarm__mfcc__instance__q31.html">arm_mfcc_instance_q31</a> *S, uint32_t nbMelFilters, uint32_t nbDctOutputs, const <a class="el" href="arm__math__types_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> *dctCoefs, const uint32_t *filterPos, const uint32_t *filterLengths, const <a class="el" href="arm__math__types_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> *filterCoefs, const <a class="el" href="arm__math__types_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> *windowCoefs)</td></tr>
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<tr class="memdesc:gabe57572879701c8f2e89497d9d99d2ca"><td class="mdescLeft"> </td><td class="mdescRight">Initialization of the MFCC Q31 instance structure for 1024 sample MFCC. <a href="group__MFCCQ31.html#gabe57572879701c8f2e89497d9d99d2ca">More...</a><br /></td></tr>
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<tr class="separator:gabe57572879701c8f2e89497d9d99d2ca"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:ga4cac48e9fe3bccb133f5eff66189c7f4"><td class="memItemLeft" align="right" valign="top"><a class="el" href="arm__math__types_8h.html#a5e459c6409dfcd2927bb8a57491d7cf6">arm_status</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__MFCCQ31.html#ga4cac48e9fe3bccb133f5eff66189c7f4">arm_mfcc_init_2048_q31</a> (<a class="el" href="structarm__mfcc__instance__q31.html">arm_mfcc_instance_q31</a> *S, uint32_t nbMelFilters, uint32_t nbDctOutputs, const <a class="el" href="arm__math__types_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> *dctCoefs, const uint32_t *filterPos, const uint32_t *filterLengths, const <a class="el" href="arm__math__types_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> *filterCoefs, const <a class="el" href="arm__math__types_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> *windowCoefs)</td></tr>
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<tr class="memdesc:ga4cac48e9fe3bccb133f5eff66189c7f4"><td class="mdescLeft"> </td><td class="mdescRight">Initialization of the MFCC Q31 instance structure for 2048 sample MFCC. <a href="group__MFCCQ31.html#ga4cac48e9fe3bccb133f5eff66189c7f4">More...</a><br /></td></tr>
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<tr class="separator:ga4cac48e9fe3bccb133f5eff66189c7f4"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:gac18f077b210098746a10b9c2e6017c6d"><td class="memItemLeft" align="right" valign="top"><a class="el" href="arm__math__types_8h.html#a5e459c6409dfcd2927bb8a57491d7cf6">arm_status</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__MFCCQ31.html#gac18f077b210098746a10b9c2e6017c6d">arm_mfcc_init_4096_q31</a> (<a class="el" href="structarm__mfcc__instance__q31.html">arm_mfcc_instance_q31</a> *S, uint32_t nbMelFilters, uint32_t nbDctOutputs, const <a class="el" href="arm__math__types_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> *dctCoefs, const uint32_t *filterPos, const uint32_t *filterLengths, const <a class="el" href="arm__math__types_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> *filterCoefs, const <a class="el" href="arm__math__types_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> *windowCoefs)</td></tr>
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<tr class="memdesc:gac18f077b210098746a10b9c2e6017c6d"><td class="mdescLeft"> </td><td class="mdescRight">Initialization of the MFCC Q31 instance structure for 4096 sample MFCC. <a href="group__MFCCQ31.html#gac18f077b210098746a10b9c2e6017c6d">More...</a><br /></td></tr>
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<tr class="separator:gac18f077b210098746a10b9c2e6017c6d"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:ga7ab98731e9e4a7705be0b3ca0c5bd94c"><td class="memItemLeft" align="right" valign="top"><a class="el" href="arm__math__types_8h.html#a5e459c6409dfcd2927bb8a57491d7cf6">arm_status</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__MFCCQ31.html#ga7ab98731e9e4a7705be0b3ca0c5bd94c">arm_mfcc_q31</a> (const <a class="el" href="structarm__mfcc__instance__q31.html">arm_mfcc_instance_q31</a> *S, <a class="el" href="arm__math__types_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> *pSrc, <a class="el" href="arm__math__types_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> *pDst, <a class="el" href="arm__math__types_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> *pTmp)</td></tr>
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<tr class="memdesc:ga7ab98731e9e4a7705be0b3ca0c5bd94c"><td class="mdescLeft"> </td><td class="mdescRight">MFCC Q31. <a href="group__MFCCQ31.html#ga7ab98731e9e4a7705be0b3ca0c5bd94c">More...</a><br /></td></tr>
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<tr class="separator:ga7ab98731e9e4a7705be0b3ca0c5bd94c"><td class="memSeparator" colspan="2"> </td></tr>
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</table>
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<a name="details" id="details"></a><h2 class="groupheader">Description</h2>
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<h2 class="groupheader">Function Documentation</h2>
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<a id="gabe57572879701c8f2e89497d9d99d2ca" name="gabe57572879701c8f2e89497d9d99d2ca"></a>
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<h2 class="memtitle"><span class="permalink"><a href="#gabe57572879701c8f2e89497d9d99d2ca">◆ </a></span>arm_mfcc_init_1024_q31()</h2>
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<td class="memname"><a class="el" href="arm__math__types_8h.html#a5e459c6409dfcd2927bb8a57491d7cf6">arm_status</a> arm_mfcc_init_1024_q31 </td>
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<td>(</td>
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<td class="paramtype"><a class="el" href="structarm__mfcc__instance__q31.html">arm_mfcc_instance_q31</a> * </td>
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<td class="paramname"><em>S</em>, </td>
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<td class="paramtype">uint32_t </td>
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<td class="paramname"><em>nbMelFilters</em>, </td>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">uint32_t </td>
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<td class="paramname"><em>nbDctOutputs</em>, </td>
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<td></td>
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<td class="paramtype">const <a class="el" href="arm__math__types_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> * </td>
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<td class="paramname"><em>dctCoefs</em>, </td>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">const uint32_t * </td>
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<td class="paramname"><em>filterPos</em>, </td>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">const uint32_t * </td>
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<td class="paramname"><em>filterLengths</em>, </td>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">const <a class="el" href="arm__math__types_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> * </td>
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<td class="paramname"><em>filterCoefs</em>, </td>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">const <a class="el" href="arm__math__types_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> * </td>
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<td class="paramname"><em>windowCoefs</em> </td>
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<td></td>
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<td>)</td>
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</div><div class="memdoc">
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<dl class="params"><dt>Parameters</dt><dd>
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<table class="params">
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<tr><td class="paramdir">[out]</td><td class="paramname">S</td><td>points to the mfcc instance structure </td></tr>
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<tr><td class="paramdir">[in]</td><td class="paramname">nbMelFilters</td><td>number of Mel filters </td></tr>
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<tr><td class="paramdir">[in]</td><td class="paramname">nbDctOutputs</td><td>number of Dct outputs </td></tr>
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<tr><td class="paramdir">[in]</td><td class="paramname">dctCoefs</td><td>points to an array of DCT coefficients </td></tr>
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<tr><td class="paramdir">[in]</td><td class="paramname">filterPos</td><td>points of the array of filter positions </td></tr>
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<tr><td class="paramdir">[in]</td><td class="paramname">filterLengths</td><td>points to the array of filter lengths </td></tr>
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<tr><td class="paramdir">[in]</td><td class="paramname">filterCoefs</td><td>points to the array of filter coefficients </td></tr>
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<tr><td class="paramdir">[in]</td><td class="paramname">windowCoefs</td><td>points to the array of window coefficients</td></tr>
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</table>
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</dd>
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</dl>
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<dl class="section return"><dt>Returns</dt><dd>error status</dd></dl>
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<dl class="section user"><dt>Description</dt><dd>The matrix of Mel filter coefficients is sparse. Most of the coefficients are zero. To avoid multiplying the spectrogram by those zeros, the filter is applied only to a given position in the spectrogram and on a given number of FFT bins (the filter length). It is the reason for the arrays filterPos and filterLengths.</dd></dl>
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<p>window coefficients can describe (for instance) a Hamming window. The array has the same size as the FFT length.</p>
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<p >The folder Scripts is containing a Python script which can be used to generate the filter, dct and window arrays. </p>
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<a id="ga742e2526ceeb559832769d20ca51a568" name="ga742e2526ceeb559832769d20ca51a568"></a>
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<h2 class="memtitle"><span class="permalink"><a href="#ga742e2526ceeb559832769d20ca51a568">◆ </a></span>arm_mfcc_init_128_q31()</h2>
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<td class="memname"><a class="el" href="arm__math__types_8h.html#a5e459c6409dfcd2927bb8a57491d7cf6">arm_status</a> arm_mfcc_init_128_q31 </td>
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<td>(</td>
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<td class="paramtype"><a class="el" href="structarm__mfcc__instance__q31.html">arm_mfcc_instance_q31</a> * </td>
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<td class="paramname"><em>S</em>, </td>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">uint32_t </td>
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<td class="paramname"><em>nbMelFilters</em>, </td>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">uint32_t </td>
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<td class="paramname"><em>nbDctOutputs</em>, </td>
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</tr>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">const <a class="el" href="arm__math__types_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> * </td>
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<td class="paramname"><em>dctCoefs</em>, </td>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">const uint32_t * </td>
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<td class="paramname"><em>filterPos</em>, </td>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">const uint32_t * </td>
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<td class="paramname"><em>filterLengths</em>, </td>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">const <a class="el" href="arm__math__types_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> * </td>
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<td class="paramname"><em>filterCoefs</em>, </td>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">const <a class="el" href="arm__math__types_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> * </td>
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<td class="paramname"><em>windowCoefs</em> </td>
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<td></td>
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<td>)</td>
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<td></td><td></td>
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</div><div class="memdoc">
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<dl class="params"><dt>Parameters</dt><dd>
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<table class="params">
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<tr><td class="paramdir">[out]</td><td class="paramname">S</td><td>points to the mfcc instance structure </td></tr>
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<tr><td class="paramdir">[in]</td><td class="paramname">nbMelFilters</td><td>number of Mel filters </td></tr>
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<tr><td class="paramdir">[in]</td><td class="paramname">nbDctOutputs</td><td>number of Dct outputs </td></tr>
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<tr><td class="paramdir">[in]</td><td class="paramname">dctCoefs</td><td>points to an array of DCT coefficients </td></tr>
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<tr><td class="paramdir">[in]</td><td class="paramname">filterPos</td><td>points of the array of filter positions </td></tr>
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<tr><td class="paramdir">[in]</td><td class="paramname">filterLengths</td><td>points to the array of filter lengths </td></tr>
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<tr><td class="paramdir">[in]</td><td class="paramname">filterCoefs</td><td>points to the array of filter coefficients </td></tr>
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<tr><td class="paramdir">[in]</td><td class="paramname">windowCoefs</td><td>points to the array of window coefficients</td></tr>
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</table>
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</dd>
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</dl>
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<dl class="section return"><dt>Returns</dt><dd>error status</dd></dl>
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<dl class="section user"><dt>Description</dt><dd>The matrix of Mel filter coefficients is sparse. Most of the coefficients are zero. To avoid multiplying the spectrogram by those zeros, the filter is applied only to a given position in the spectrogram and on a given number of FFT bins (the filter length). It is the reason for the arrays filterPos and filterLengths.</dd></dl>
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<p>window coefficients can describe (for instance) a Hamming window. The array has the same size as the FFT length.</p>
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<p >The folder Scripts is containing a Python script which can be used to generate the filter, dct and window arrays. </p>
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</div>
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</div>
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<a id="ga4cac48e9fe3bccb133f5eff66189c7f4" name="ga4cac48e9fe3bccb133f5eff66189c7f4"></a>
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<h2 class="memtitle"><span class="permalink"><a href="#ga4cac48e9fe3bccb133f5eff66189c7f4">◆ </a></span>arm_mfcc_init_2048_q31()</h2>
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<td class="memname"><a class="el" href="arm__math__types_8h.html#a5e459c6409dfcd2927bb8a57491d7cf6">arm_status</a> arm_mfcc_init_2048_q31 </td>
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<td>(</td>
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<td class="paramtype"><a class="el" href="structarm__mfcc__instance__q31.html">arm_mfcc_instance_q31</a> * </td>
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<td class="paramname"><em>S</em>, </td>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">uint32_t </td>
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<td class="paramname"><em>nbMelFilters</em>, </td>
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</tr>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">uint32_t </td>
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<td class="paramname"><em>nbDctOutputs</em>, </td>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">const <a class="el" href="arm__math__types_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> * </td>
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<td class="paramname"><em>dctCoefs</em>, </td>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">const uint32_t * </td>
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<td class="paramname"><em>filterPos</em>, </td>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">const uint32_t * </td>
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<td class="paramname"><em>filterLengths</em>, </td>
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</tr>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">const <a class="el" href="arm__math__types_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> * </td>
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<td class="paramname"><em>filterCoefs</em>, </td>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">const <a class="el" href="arm__math__types_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> * </td>
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<td class="paramname"><em>windowCoefs</em> </td>
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<td></td>
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<td>)</td>
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<td></td><td></td>
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</div><div class="memdoc">
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<dl class="params"><dt>Parameters</dt><dd>
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<table class="params">
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<tr><td class="paramdir">[out]</td><td class="paramname">S</td><td>points to the mfcc instance structure </td></tr>
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<tr><td class="paramdir">[in]</td><td class="paramname">nbMelFilters</td><td>number of Mel filters </td></tr>
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<tr><td class="paramdir">[in]</td><td class="paramname">nbDctOutputs</td><td>number of Dct outputs </td></tr>
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<tr><td class="paramdir">[in]</td><td class="paramname">dctCoefs</td><td>points to an array of DCT coefficients </td></tr>
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<tr><td class="paramdir">[in]</td><td class="paramname">filterPos</td><td>points of the array of filter positions </td></tr>
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<tr><td class="paramdir">[in]</td><td class="paramname">filterLengths</td><td>points to the array of filter lengths </td></tr>
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<tr><td class="paramdir">[in]</td><td class="paramname">filterCoefs</td><td>points to the array of filter coefficients </td></tr>
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<tr><td class="paramdir">[in]</td><td class="paramname">windowCoefs</td><td>points to the array of window coefficients</td></tr>
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</table>
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</dd>
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</dl>
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<dl class="section return"><dt>Returns</dt><dd>error status</dd></dl>
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<dl class="section user"><dt>Description</dt><dd>The matrix of Mel filter coefficients is sparse. Most of the coefficients are zero. To avoid multiplying the spectrogram by those zeros, the filter is applied only to a given position in the spectrogram and on a given number of FFT bins (the filter length). It is the reason for the arrays filterPos and filterLengths.</dd></dl>
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<p>window coefficients can describe (for instance) a Hamming window. The array has the same size as the FFT length.</p>
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<p >The folder Scripts is containing a Python script which can be used to generate the filter, dct and window arrays. </p>
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</div>
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</div>
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<a id="gab27a895d360c8ee12f0bde2ec0ff7c98" name="gab27a895d360c8ee12f0bde2ec0ff7c98"></a>
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<h2 class="memtitle"><span class="permalink"><a href="#gab27a895d360c8ee12f0bde2ec0ff7c98">◆ </a></span>arm_mfcc_init_256_q31()</h2>
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<td class="memname"><a class="el" href="arm__math__types_8h.html#a5e459c6409dfcd2927bb8a57491d7cf6">arm_status</a> arm_mfcc_init_256_q31 </td>
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<td>(</td>
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<td class="paramtype"><a class="el" href="structarm__mfcc__instance__q31.html">arm_mfcc_instance_q31</a> * </td>
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<td class="paramname"><em>S</em>, </td>
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</tr>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">uint32_t </td>
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<td class="paramname"><em>nbMelFilters</em>, </td>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">uint32_t </td>
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<td class="paramname"><em>nbDctOutputs</em>, </td>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">const <a class="el" href="arm__math__types_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> * </td>
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<td class="paramname"><em>dctCoefs</em>, </td>
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</tr>
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<tr>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">const uint32_t * </td>
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<td class="paramname"><em>filterPos</em>, </td>
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</tr>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">const uint32_t * </td>
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<td class="paramname"><em>filterLengths</em>, </td>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">const <a class="el" href="arm__math__types_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> * </td>
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<td class="paramname"><em>filterCoefs</em>, </td>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">const <a class="el" href="arm__math__types_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> * </td>
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<td class="paramname"><em>windowCoefs</em> </td>
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</tr>
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<tr>
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<td></td>
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<td>)</td>
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<td></td><td></td>
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</div><div class="memdoc">
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<dl class="params"><dt>Parameters</dt><dd>
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<table class="params">
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<tr><td class="paramdir">[out]</td><td class="paramname">S</td><td>points to the mfcc instance structure </td></tr>
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<tr><td class="paramdir">[in]</td><td class="paramname">nbMelFilters</td><td>number of Mel filters </td></tr>
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<tr><td class="paramdir">[in]</td><td class="paramname">nbDctOutputs</td><td>number of Dct outputs </td></tr>
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<tr><td class="paramdir">[in]</td><td class="paramname">dctCoefs</td><td>points to an array of DCT coefficients </td></tr>
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<tr><td class="paramdir">[in]</td><td class="paramname">filterPos</td><td>points of the array of filter positions </td></tr>
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<tr><td class="paramdir">[in]</td><td class="paramname">filterLengths</td><td>points to the array of filter lengths </td></tr>
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<tr><td class="paramdir">[in]</td><td class="paramname">filterCoefs</td><td>points to the array of filter coefficients </td></tr>
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<tr><td class="paramdir">[in]</td><td class="paramname">windowCoefs</td><td>points to the array of window coefficients</td></tr>
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</table>
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</dd>
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</dl>
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<dl class="section return"><dt>Returns</dt><dd>error status</dd></dl>
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<dl class="section user"><dt>Description</dt><dd>The matrix of Mel filter coefficients is sparse. Most of the coefficients are zero. To avoid multiplying the spectrogram by those zeros, the filter is applied only to a given position in the spectrogram and on a given number of FFT bins (the filter length). It is the reason for the arrays filterPos and filterLengths.</dd></dl>
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<p>window coefficients can describe (for instance) a Hamming window. The array has the same size as the FFT length.</p>
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<p >The folder Scripts is containing a Python script which can be used to generate the filter, dct and window arrays. </p>
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</div>
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<a id="gaf600d13d2afb6575c08c98371a36d88c" name="gaf600d13d2afb6575c08c98371a36d88c"></a>
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<h2 class="memtitle"><span class="permalink"><a href="#gaf600d13d2afb6575c08c98371a36d88c">◆ </a></span>arm_mfcc_init_32_q31()</h2>
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<td class="memname"><a class="el" href="arm__math__types_8h.html#a5e459c6409dfcd2927bb8a57491d7cf6">arm_status</a> arm_mfcc_init_32_q31 </td>
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<td>(</td>
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<td class="paramtype"><a class="el" href="structarm__mfcc__instance__q31.html">arm_mfcc_instance_q31</a> * </td>
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<td class="paramname"><em>S</em>, </td>
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<td class="paramkey"></td>
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<td class="paramtype">uint32_t </td>
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<td class="paramname"><em>nbMelFilters</em>, </td>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">uint32_t </td>
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<td class="paramname"><em>nbDctOutputs</em>, </td>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">const <a class="el" href="arm__math__types_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> * </td>
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<td class="paramname"><em>dctCoefs</em>, </td>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">const uint32_t * </td>
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<td class="paramname"><em>filterPos</em>, </td>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">const uint32_t * </td>
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<td class="paramname"><em>filterLengths</em>, </td>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">const <a class="el" href="arm__math__types_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> * </td>
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<td class="paramname"><em>filterCoefs</em>, </td>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">const <a class="el" href="arm__math__types_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> * </td>
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<td class="paramname"><em>windowCoefs</em> </td>
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<td></td>
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<td>)</td>
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<td></td><td></td>
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<dl class="params"><dt>Parameters</dt><dd>
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<table class="params">
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<tr><td class="paramdir">[out]</td><td class="paramname">S</td><td>points to the mfcc instance structure </td></tr>
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<tr><td class="paramdir">[in]</td><td class="paramname">nbMelFilters</td><td>number of Mel filters </td></tr>
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<tr><td class="paramdir">[in]</td><td class="paramname">nbDctOutputs</td><td>number of Dct outputs </td></tr>
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<tr><td class="paramdir">[in]</td><td class="paramname">dctCoefs</td><td>points to an array of DCT coefficients </td></tr>
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<tr><td class="paramdir">[in]</td><td class="paramname">filterPos</td><td>points of the array of filter positions </td></tr>
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<tr><td class="paramdir">[in]</td><td class="paramname">filterLengths</td><td>points to the array of filter lengths </td></tr>
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<tr><td class="paramdir">[in]</td><td class="paramname">filterCoefs</td><td>points to the array of filter coefficients </td></tr>
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<tr><td class="paramdir">[in]</td><td class="paramname">windowCoefs</td><td>points to the array of window coefficients</td></tr>
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</table>
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</dd>
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</dl>
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<dl class="section return"><dt>Returns</dt><dd>error status</dd></dl>
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<dl class="section user"><dt>Description</dt><dd>The matrix of Mel filter coefficients is sparse. Most of the coefficients are zero. To avoid multiplying the spectrogram by those zeros, the filter is applied only to a given position in the spectrogram and on a given number of FFT bins (the filter length). It is the reason for the arrays filterPos and filterLengths.</dd></dl>
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<p>window coefficients can describe (for instance) a Hamming window. The array has the same size as the FFT length.</p>
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<p >The folder Scripts is containing a Python script which can be used to generate the filter, dct and window arrays. </p>
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</div>
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</div>
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<a id="gac18f077b210098746a10b9c2e6017c6d" name="gac18f077b210098746a10b9c2e6017c6d"></a>
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<h2 class="memtitle"><span class="permalink"><a href="#gac18f077b210098746a10b9c2e6017c6d">◆ </a></span>arm_mfcc_init_4096_q31()</h2>
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<td class="memname"><a class="el" href="arm__math__types_8h.html#a5e459c6409dfcd2927bb8a57491d7cf6">arm_status</a> arm_mfcc_init_4096_q31 </td>
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<td>(</td>
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<td class="paramtype"><a class="el" href="structarm__mfcc__instance__q31.html">arm_mfcc_instance_q31</a> * </td>
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<td class="paramname"><em>S</em>, </td>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">uint32_t </td>
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<td class="paramname"><em>nbMelFilters</em>, </td>
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</tr>
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<tr>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">uint32_t </td>
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<td class="paramname"><em>nbDctOutputs</em>, </td>
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<tr>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">const <a class="el" href="arm__math__types_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> * </td>
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<td class="paramname"><em>dctCoefs</em>, </td>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">const uint32_t * </td>
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<td class="paramname"><em>filterPos</em>, </td>
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<tr>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">const uint32_t * </td>
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<td class="paramname"><em>filterLengths</em>, </td>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">const <a class="el" href="arm__math__types_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> * </td>
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<td class="paramname"><em>filterCoefs</em>, </td>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">const <a class="el" href="arm__math__types_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> * </td>
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<td class="paramname"><em>windowCoefs</em> </td>
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</tr>
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<td></td>
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<td>)</td>
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<td></td><td></td>
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</div><div class="memdoc">
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<dl class="params"><dt>Parameters</dt><dd>
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<table class="params">
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<tr><td class="paramdir">[out]</td><td class="paramname">S</td><td>points to the mfcc instance structure </td></tr>
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<tr><td class="paramdir">[in]</td><td class="paramname">nbMelFilters</td><td>number of Mel filters </td></tr>
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<tr><td class="paramdir">[in]</td><td class="paramname">nbDctOutputs</td><td>number of Dct outputs </td></tr>
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<tr><td class="paramdir">[in]</td><td class="paramname">dctCoefs</td><td>points to an array of DCT coefficients </td></tr>
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<tr><td class="paramdir">[in]</td><td class="paramname">filterPos</td><td>points of the array of filter positions </td></tr>
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<tr><td class="paramdir">[in]</td><td class="paramname">filterLengths</td><td>points to the array of filter lengths </td></tr>
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<tr><td class="paramdir">[in]</td><td class="paramname">filterCoefs</td><td>points to the array of filter coefficients </td></tr>
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<tr><td class="paramdir">[in]</td><td class="paramname">windowCoefs</td><td>points to the array of window coefficients</td></tr>
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</table>
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</dd>
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</dl>
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<dl class="section return"><dt>Returns</dt><dd>error status</dd></dl>
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<dl class="section user"><dt>Description</dt><dd>The matrix of Mel filter coefficients is sparse. Most of the coefficients are zero. To avoid multiplying the spectrogram by those zeros, the filter is applied only to a given position in the spectrogram and on a given number of FFT bins (the filter length). It is the reason for the arrays filterPos and filterLengths.</dd></dl>
|
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<p>window coefficients can describe (for instance) a Hamming window. The array has the same size as the FFT length.</p>
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<p >The folder Scripts is containing a Python script which can be used to generate the filter, dct and window arrays. </p>
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</div>
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</div>
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<a id="gae1b3d5cd7b77def16e1b4c6b0ab2984e" name="gae1b3d5cd7b77def16e1b4c6b0ab2984e"></a>
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<h2 class="memtitle"><span class="permalink"><a href="#gae1b3d5cd7b77def16e1b4c6b0ab2984e">◆ </a></span>arm_mfcc_init_512_q31()</h2>
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<td class="memname"><a class="el" href="arm__math__types_8h.html#a5e459c6409dfcd2927bb8a57491d7cf6">arm_status</a> arm_mfcc_init_512_q31 </td>
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<td>(</td>
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<td class="paramtype"><a class="el" href="structarm__mfcc__instance__q31.html">arm_mfcc_instance_q31</a> * </td>
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<td class="paramname"><em>S</em>, </td>
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</tr>
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<tr>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">uint32_t </td>
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<td class="paramname"><em>nbMelFilters</em>, </td>
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</tr>
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<tr>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">uint32_t </td>
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<td class="paramname"><em>nbDctOutputs</em>, </td>
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</tr>
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<tr>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">const <a class="el" href="arm__math__types_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> * </td>
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<td class="paramname"><em>dctCoefs</em>, </td>
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</tr>
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<tr>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">const uint32_t * </td>
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<td class="paramname"><em>filterPos</em>, </td>
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</tr>
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<tr>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">const uint32_t * </td>
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<td class="paramname"><em>filterLengths</em>, </td>
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</tr>
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<tr>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">const <a class="el" href="arm__math__types_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> * </td>
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<td class="paramname"><em>filterCoefs</em>, </td>
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</tr>
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<tr>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">const <a class="el" href="arm__math__types_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> * </td>
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<td class="paramname"><em>windowCoefs</em> </td>
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</tr>
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<tr>
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<td></td>
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<td>)</td>
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<td></td><td></td>
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</table>
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</div><div class="memdoc">
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<dl class="params"><dt>Parameters</dt><dd>
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<table class="params">
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<tr><td class="paramdir">[out]</td><td class="paramname">S</td><td>points to the mfcc instance structure </td></tr>
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<tr><td class="paramdir">[in]</td><td class="paramname">nbMelFilters</td><td>number of Mel filters </td></tr>
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<tr><td class="paramdir">[in]</td><td class="paramname">nbDctOutputs</td><td>number of Dct outputs </td></tr>
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<tr><td class="paramdir">[in]</td><td class="paramname">dctCoefs</td><td>points to an array of DCT coefficients </td></tr>
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<tr><td class="paramdir">[in]</td><td class="paramname">filterPos</td><td>points of the array of filter positions </td></tr>
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<tr><td class="paramdir">[in]</td><td class="paramname">filterLengths</td><td>points to the array of filter lengths </td></tr>
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<tr><td class="paramdir">[in]</td><td class="paramname">filterCoefs</td><td>points to the array of filter coefficients </td></tr>
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<tr><td class="paramdir">[in]</td><td class="paramname">windowCoefs</td><td>points to the array of window coefficients</td></tr>
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</table>
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</dd>
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</dl>
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<dl class="section return"><dt>Returns</dt><dd>error status</dd></dl>
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<dl class="section user"><dt>Description</dt><dd>The matrix of Mel filter coefficients is sparse. Most of the coefficients are zero. To avoid multiplying the spectrogram by those zeros, the filter is applied only to a given position in the spectrogram and on a given number of FFT bins (the filter length). It is the reason for the arrays filterPos and filterLengths.</dd></dl>
|
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<p>window coefficients can describe (for instance) a Hamming window. The array has the same size as the FFT length.</p>
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<p >The folder Scripts is containing a Python script which can be used to generate the filter, dct and window arrays. </p>
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</div>
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</div>
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<a id="gab2f377799d0d6c524fbdd3b21618a90a" name="gab2f377799d0d6c524fbdd3b21618a90a"></a>
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<h2 class="memtitle"><span class="permalink"><a href="#gab2f377799d0d6c524fbdd3b21618a90a">◆ </a></span>arm_mfcc_init_64_q31()</h2>
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<td class="memname"><a class="el" href="arm__math__types_8h.html#a5e459c6409dfcd2927bb8a57491d7cf6">arm_status</a> arm_mfcc_init_64_q31 </td>
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<td>(</td>
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<td class="paramtype"><a class="el" href="structarm__mfcc__instance__q31.html">arm_mfcc_instance_q31</a> * </td>
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<td class="paramname"><em>S</em>, </td>
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</tr>
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<tr>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">uint32_t </td>
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<td class="paramname"><em>nbMelFilters</em>, </td>
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</tr>
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<tr>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">uint32_t </td>
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<td class="paramname"><em>nbDctOutputs</em>, </td>
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</tr>
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<tr>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">const <a class="el" href="arm__math__types_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> * </td>
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<td class="paramname"><em>dctCoefs</em>, </td>
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</tr>
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<tr>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">const uint32_t * </td>
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<td class="paramname"><em>filterPos</em>, </td>
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</tr>
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<tr>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">const uint32_t * </td>
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<td class="paramname"><em>filterLengths</em>, </td>
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</tr>
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<tr>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">const <a class="el" href="arm__math__types_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> * </td>
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<td class="paramname"><em>filterCoefs</em>, </td>
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</tr>
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<tr>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">const <a class="el" href="arm__math__types_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> * </td>
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<td class="paramname"><em>windowCoefs</em> </td>
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</tr>
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<tr>
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<td></td>
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<td>)</td>
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<td></td><td></td>
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</table>
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</div><div class="memdoc">
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<dl class="params"><dt>Parameters</dt><dd>
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<table class="params">
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<tr><td class="paramdir">[out]</td><td class="paramname">S</td><td>points to the mfcc instance structure </td></tr>
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<tr><td class="paramdir">[in]</td><td class="paramname">nbMelFilters</td><td>number of Mel filters </td></tr>
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<tr><td class="paramdir">[in]</td><td class="paramname">nbDctOutputs</td><td>number of Dct outputs </td></tr>
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<tr><td class="paramdir">[in]</td><td class="paramname">dctCoefs</td><td>points to an array of DCT coefficients </td></tr>
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<tr><td class="paramdir">[in]</td><td class="paramname">filterPos</td><td>points of the array of filter positions </td></tr>
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<tr><td class="paramdir">[in]</td><td class="paramname">filterLengths</td><td>points to the array of filter lengths </td></tr>
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<tr><td class="paramdir">[in]</td><td class="paramname">filterCoefs</td><td>points to the array of filter coefficients </td></tr>
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<tr><td class="paramdir">[in]</td><td class="paramname">windowCoefs</td><td>points to the array of window coefficients</td></tr>
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</table>
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</dd>
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</dl>
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<dl class="section return"><dt>Returns</dt><dd>error status</dd></dl>
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<dl class="section user"><dt>Description</dt><dd>The matrix of Mel filter coefficients is sparse. Most of the coefficients are zero. To avoid multiplying the spectrogram by those zeros, the filter is applied only to a given position in the spectrogram and on a given number of FFT bins (the filter length). It is the reason for the arrays filterPos and filterLengths.</dd></dl>
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<p>window coefficients can describe (for instance) a Hamming window. The array has the same size as the FFT length.</p>
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<p >The folder Scripts is containing a Python script which can be used to generate the filter, dct and window arrays. </p>
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</div>
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</div>
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<a id="ga758406a367635b2878ea1f59107087db" name="ga758406a367635b2878ea1f59107087db"></a>
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<h2 class="memtitle"><span class="permalink"><a href="#ga758406a367635b2878ea1f59107087db">◆ </a></span>arm_mfcc_init_q31()</h2>
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<td class="memname"><a class="el" href="arm__math__types_8h.html#a5e459c6409dfcd2927bb8a57491d7cf6">arm_status</a> arm_mfcc_init_q31 </td>
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<td>(</td>
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<td class="paramtype"><a class="el" href="structarm__mfcc__instance__q31.html">arm_mfcc_instance_q31</a> * </td>
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<td class="paramname"><em>S</em>, </td>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">uint32_t </td>
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<td class="paramname"><em>fftLen</em>, </td>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">uint32_t </td>
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<td class="paramname"><em>nbMelFilters</em>, </td>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">uint32_t </td>
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<td class="paramname"><em>nbDctOutputs</em>, </td>
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</tr>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">const <a class="el" href="arm__math__types_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> * </td>
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<td class="paramname"><em>dctCoefs</em>, </td>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">const uint32_t * </td>
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<td class="paramname"><em>filterPos</em>, </td>
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</tr>
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<tr>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">const uint32_t * </td>
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<td class="paramname"><em>filterLengths</em>, </td>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">const <a class="el" href="arm__math__types_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> * </td>
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<td class="paramname"><em>filterCoefs</em>, </td>
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</tr>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">const <a class="el" href="arm__math__types_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> * </td>
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<td class="paramname"><em>windowCoefs</em> </td>
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</tr>
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<tr>
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<td></td>
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<td>)</td>
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<td></td><td></td>
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</table>
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</div><div class="memdoc">
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<dl class="params"><dt>Parameters</dt><dd>
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<table class="params">
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<tr><td class="paramdir">[out]</td><td class="paramname">S</td><td>points to the mfcc instance structure </td></tr>
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<tr><td class="paramdir">[in]</td><td class="paramname">fftLen</td><td>fft length </td></tr>
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<tr><td class="paramdir">[in]</td><td class="paramname">nbMelFilters</td><td>number of Mel filters </td></tr>
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<tr><td class="paramdir">[in]</td><td class="paramname">nbDctOutputs</td><td>number of Dct outputs </td></tr>
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<tr><td class="paramdir">[in]</td><td class="paramname">dctCoefs</td><td>points to an array of DCT coefficients </td></tr>
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<tr><td class="paramdir">[in]</td><td class="paramname">filterPos</td><td>points of the array of filter positions </td></tr>
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<tr><td class="paramdir">[in]</td><td class="paramname">filterLengths</td><td>points to the array of filter lengths </td></tr>
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<tr><td class="paramdir">[in]</td><td class="paramname">filterCoefs</td><td>points to the array of filter coefficients </td></tr>
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<tr><td class="paramdir">[in]</td><td class="paramname">windowCoefs</td><td>points to the array of window coefficients</td></tr>
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</table>
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</dd>
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</dl>
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<dl class="section return"><dt>Returns</dt><dd>error status</dd></dl>
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<dl class="section user"><dt>Description</dt><dd>The matrix of Mel filter coefficients is sparse. Most of the coefficients are zero. To avoid multiplying the spectrogram by those zeros, the filter is applied only to a given position in the spectrogram and on a given number of FFT bins (the filter length). It is the reason for the arrays filterPos and filterLengths.</dd></dl>
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<p>window coefficients can describe (for instance) a Hamming window. The array has the same size as the FFT length.</p>
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<p >The folder Scripts is containing a Python script which can be used to generate the filter, dct and window arrays. </p><dl class="section user"><dt></dt><dd>This function should be used only if you don't know the FFT sizes that you'll need at build time. The use of this function will prevent the linker from removing the FFT tables that are not needed and the library code size will be bigger than needed.</dd></dl>
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<dl class="section user"><dt></dt><dd>If you use CMSIS-DSP as a static library, and if you know the MFCC sizes that you need at build time, then it is better to use the initialization functions defined for each MFCC size. </dd></dl>
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</div>
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<h2 class="memtitle"><span class="permalink"><a href="#ga7ab98731e9e4a7705be0b3ca0c5bd94c">◆ </a></span>arm_mfcc_q31()</h2>
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<td class="memname"><a class="el" href="arm__math__types_8h.html#a5e459c6409dfcd2927bb8a57491d7cf6">arm_status</a> arm_mfcc_q31 </td>
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<td>(</td>
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<td class="paramtype">const <a class="el" href="structarm__mfcc__instance__q31.html">arm_mfcc_instance_q31</a> * </td>
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<td class="paramname"><em>S</em>, </td>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype"><a class="el" href="arm__math__types_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> * </td>
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<td class="paramname"><em>pSrc</em>, </td>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype"><a class="el" href="arm__math__types_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> * </td>
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<td class="paramname"><em>pDst</em>, </td>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype"><a class="el" href="arm__math__types_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> * </td>
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<td class="paramname"><em>pTmp</em> </td>
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<td></td>
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<td>)</td>
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<td></td><td></td>
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</table>
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</div><div class="memdoc">
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<dl class="params"><dt>Parameters</dt><dd>
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<table class="params">
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<tr><td class="paramdir">[in]</td><td class="paramname">S</td><td>points to the mfcc instance structure </td></tr>
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<tr><td class="paramdir">[in]</td><td class="paramname">pSrc</td><td>points to the input samples in Q31 </td></tr>
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<tr><td class="paramdir">[out]</td><td class="paramname">pDst</td><td>points to the output MFCC values in q8.23 format </td></tr>
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<tr><td class="paramdir">[in,out]</td><td class="paramname">pTmp</td><td>points to a temporary buffer of complex</td></tr>
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</table>
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</dd>
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</dl>
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<dl class="section return"><dt>Returns</dt><dd>none</dd></dl>
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<dl class="section user"><dt>Description</dt><dd>The number of input samples is the FFT length used when initializing the instance data structure.</dd></dl>
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<p>The temporary buffer has a 2*fft length.</p>
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<p >The source buffer is modified by this function.</p>
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<p >The function may saturate. If the FFT length is too big and the number of MEL filters too small then the fixed point computations may saturate. </p>
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</div>
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</div>
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