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501 lines
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<a href="#func-members">Functions</a> </div>
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<div class="headertitle"><div class="title">Vector Scale<div class="ingroups"><a class="el" href="group__groupMath.html">Basic Math Functions</a></div></div></div>
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</div><!--header-->
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<div class="contents">
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<table class="memberdecls">
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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:gad70fdbfb371663aa224c76ce90e5a300"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group__BasicScale.html#gad70fdbfb371663aa224c76ce90e5a300">arm_scale_f16</a> (const float16_t *pSrc, float16_t scale, float16_t *pDst, uint32_t <a class="el" href="arm__variance__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a>)</td></tr>
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<tr class="memdesc:gad70fdbfb371663aa224c76ce90e5a300"><td class="mdescLeft"> </td><td class="mdescRight">Multiplies a floating-point vector by a scalar. <a href="group__BasicScale.html#gad70fdbfb371663aa224c76ce90e5a300">More...</a><br /></td></tr>
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<tr class="separator:gad70fdbfb371663aa224c76ce90e5a300"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:ga5e769c8e22da173674c6abca7291e713"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group__BasicScale.html#ga5e769c8e22da173674c6abca7291e713">arm_scale_f32</a> (const <a class="el" href="arm__math__types_8h.html#a4611b605e45ab401f02cab15c5e38715">float32_t</a> *pSrc, <a class="el" href="arm__math__types_8h.html#a4611b605e45ab401f02cab15c5e38715">float32_t</a> scale, <a class="el" href="arm__math__types_8h.html#a4611b605e45ab401f02cab15c5e38715">float32_t</a> *pDst, uint32_t <a class="el" href="arm__variance__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a>)</td></tr>
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<tr class="memdesc:ga5e769c8e22da173674c6abca7291e713"><td class="mdescLeft"> </td><td class="mdescRight">Multiplies a floating-point vector by a scalar. <a href="group__BasicScale.html#ga5e769c8e22da173674c6abca7291e713">More...</a><br /></td></tr>
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<tr class="separator:ga5e769c8e22da173674c6abca7291e713"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:ga98a3022590a4367a4c9da645a94a13f5"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group__BasicScale.html#ga98a3022590a4367a4c9da645a94a13f5">arm_scale_f64</a> (const <a class="el" href="arm__math__types_8h.html#ac55f3ae81b5bc9053760baacf57e47f4">float64_t</a> *pSrc, <a class="el" href="arm__math__types_8h.html#ac55f3ae81b5bc9053760baacf57e47f4">float64_t</a> scale, <a class="el" href="arm__math__types_8h.html#ac55f3ae81b5bc9053760baacf57e47f4">float64_t</a> *pDst, uint32_t <a class="el" href="arm__variance__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a>)</td></tr>
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<tr class="memdesc:ga98a3022590a4367a4c9da645a94a13f5"><td class="mdescLeft"> </td><td class="mdescRight">Multiplies a floating-point vector by a scalar. <a href="group__BasicScale.html#ga98a3022590a4367a4c9da645a94a13f5">More...</a><br /></td></tr>
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<tr class="separator:ga98a3022590a4367a4c9da645a94a13f5"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:ga4663809f04249df5ea186ea09335e687"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group__BasicScale.html#ga4663809f04249df5ea186ea09335e687">arm_scale_q15</a> (const <a class="el" href="arm__math__types_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea">q15_t</a> *pSrc, <a class="el" href="arm__math__types_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea">q15_t</a> scaleFract, int8_t shift, <a class="el" href="arm__math__types_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea">q15_t</a> *pDst, uint32_t <a class="el" href="arm__variance__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a>)</td></tr>
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<tr class="memdesc:ga4663809f04249df5ea186ea09335e687"><td class="mdescLeft"> </td><td class="mdescRight">Multiplies a Q15 vector by a scalar. <a href="group__BasicScale.html#ga4663809f04249df5ea186ea09335e687">More...</a><br /></td></tr>
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<tr class="separator:ga4663809f04249df5ea186ea09335e687"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:ga8b2b6ea2e39ca464e8f2cfdd937c022b"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group__BasicScale.html#ga8b2b6ea2e39ca464e8f2cfdd937c022b">arm_scale_q31</a> (const <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> scaleFract, int8_t shift, <a class="el" href="arm__math__types_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> *pDst, uint32_t <a class="el" href="arm__variance__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a>)</td></tr>
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<tr class="memdesc:ga8b2b6ea2e39ca464e8f2cfdd937c022b"><td class="mdescLeft"> </td><td class="mdescRight">Multiplies a Q31 vector by a scalar. <a href="group__BasicScale.html#ga8b2b6ea2e39ca464e8f2cfdd937c022b">More...</a><br /></td></tr>
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<tr class="separator:ga8b2b6ea2e39ca464e8f2cfdd937c022b"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:ga0d135086c6b813251b47a0d127b75eb8"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group__BasicScale.html#ga0d135086c6b813251b47a0d127b75eb8">arm_scale_q7</a> (const <a class="el" href="arm__math__types_8h.html#ae541b6f232c305361e9b416fc9eed263">q7_t</a> *pSrc, <a class="el" href="arm__math__types_8h.html#ae541b6f232c305361e9b416fc9eed263">q7_t</a> scaleFract, int8_t shift, <a class="el" href="arm__math__types_8h.html#ae541b6f232c305361e9b416fc9eed263">q7_t</a> *pDst, uint32_t <a class="el" href="arm__variance__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a>)</td></tr>
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<tr class="memdesc:ga0d135086c6b813251b47a0d127b75eb8"><td class="mdescLeft"> </td><td class="mdescRight">Multiplies a Q7 vector by a scalar. <a href="group__BasicScale.html#ga0d135086c6b813251b47a0d127b75eb8">More...</a><br /></td></tr>
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<tr class="separator:ga0d135086c6b813251b47a0d127b75eb8"><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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<p >Multiply a vector by a scalar value. For floating-point data, the algorithm used is:</p>
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<pre>
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pDst[n] = pSrc[n] * scale, 0 <= n < blockSize.
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</pre><p >In the fixed-point Q7, Q15, and Q31 functions, <code>scale</code> is represented by a fractional multiplication <code>scaleFract</code> and an arithmetic shift <code>shift</code>. The shift allows the gain of the scaling operation to exceed 1.0. The algorithm used with fixed-point data is:</p>
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<pre>
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pDst[n] = (pSrc[n] * scaleFract) << shift, 0 <= n < blockSize.
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</pre><p >The overall scale factor applied to the fixed-point data is </p><pre>
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scale = scaleFract * 2^shift.
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</pre><p >The functions support in-place computation allowing the source and destination pointers to reference the same memory buffer. </p>
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<h2 class="groupheader">Function Documentation</h2>
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<a id="gad70fdbfb371663aa224c76ce90e5a300" name="gad70fdbfb371663aa224c76ce90e5a300"></a>
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<h2 class="memtitle"><span class="permalink"><a href="#gad70fdbfb371663aa224c76ce90e5a300">◆ </a></span>arm_scale_f16()</h2>
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<div class="memitem">
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<td class="memname">void arm_scale_f16 </td>
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<td>(</td>
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<td class="paramtype">const float16_t * </td>
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<td class="paramname"><em>pSrc</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">float16_t </td>
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<td class="paramname"><em>scale</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">float16_t * </td>
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<td class="paramname"><em>pDst</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>blockSize</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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</tr>
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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">pSrc</td><td>points to the input vector </td></tr>
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<tr><td class="paramdir">[in]</td><td class="paramname">scale</td><td>scale factor to be applied </td></tr>
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<tr><td class="paramdir">[out]</td><td class="paramname">pDst</td><td>points to the output vector </td></tr>
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<tr><td class="paramdir">[in]</td><td class="paramname">blockSize</td><td>number of samples in each vector </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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</div>
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</div>
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<a id="ga5e769c8e22da173674c6abca7291e713" name="ga5e769c8e22da173674c6abca7291e713"></a>
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<h2 class="memtitle"><span class="permalink"><a href="#ga5e769c8e22da173674c6abca7291e713">◆ </a></span>arm_scale_f32()</h2>
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<div class="memitem">
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<table class="memname">
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<tr>
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<td class="memname">void arm_scale_f32 </td>
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<td>(</td>
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<td class="paramtype">const <a class="el" href="arm__math__types_8h.html#a4611b605e45ab401f02cab15c5e38715">float32_t</a> * </td>
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<td class="paramname"><em>pSrc</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"><a class="el" href="arm__math__types_8h.html#a4611b605e45ab401f02cab15c5e38715">float32_t</a> </td>
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<td class="paramname"><em>scale</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"><a class="el" href="arm__math__types_8h.html#a4611b605e45ab401f02cab15c5e38715">float32_t</a> * </td>
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<td class="paramname"><em>pDst</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>blockSize</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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</tr>
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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">pSrc</td><td>points to the input vector </td></tr>
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<tr><td class="paramdir">[in]</td><td class="paramname">scale</td><td>scale factor to be applied </td></tr>
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<tr><td class="paramdir">[out]</td><td class="paramname">pDst</td><td>points to the output vector </td></tr>
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<tr><td class="paramdir">[in]</td><td class="paramname">blockSize</td><td>number of samples in each vector </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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</div>
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</div>
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<a id="ga98a3022590a4367a4c9da645a94a13f5" name="ga98a3022590a4367a4c9da645a94a13f5"></a>
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<h2 class="memtitle"><span class="permalink"><a href="#ga98a3022590a4367a4c9da645a94a13f5">◆ </a></span>arm_scale_f64()</h2>
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<div class="memitem">
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<div class="memproto">
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<table class="memname">
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<td class="memname">void arm_scale_f64 </td>
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<td>(</td>
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<td class="paramtype">const <a class="el" href="arm__math__types_8h.html#ac55f3ae81b5bc9053760baacf57e47f4">float64_t</a> * </td>
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<td class="paramname"><em>pSrc</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"><a class="el" href="arm__math__types_8h.html#ac55f3ae81b5bc9053760baacf57e47f4">float64_t</a> </td>
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<td class="paramname"><em>scale</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"><a class="el" href="arm__math__types_8h.html#ac55f3ae81b5bc9053760baacf57e47f4">float64_t</a> * </td>
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<td class="paramname"><em>pDst</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>blockSize</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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</tr>
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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">pSrc</td><td>points to the input vector </td></tr>
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<tr><td class="paramdir">[in]</td><td class="paramname">scale</td><td>scale factor to be applied </td></tr>
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<tr><td class="paramdir">[out]</td><td class="paramname">pDst</td><td>points to the output vector </td></tr>
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<tr><td class="paramdir">[in]</td><td class="paramname">blockSize</td><td>number of samples in each vector </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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</div>
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</div>
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<a id="ga4663809f04249df5ea186ea09335e687" name="ga4663809f04249df5ea186ea09335e687"></a>
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<h2 class="memtitle"><span class="permalink"><a href="#ga4663809f04249df5ea186ea09335e687">◆ </a></span>arm_scale_q15()</h2>
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<div class="memitem">
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<div class="memproto">
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<table class="memname">
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<td class="memname">void arm_scale_q15 </td>
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<td>(</td>
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<td class="paramtype">const <a class="el" href="arm__math__types_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea">q15_t</a> * </td>
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<td class="paramname"><em>pSrc</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"><a class="el" href="arm__math__types_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea">q15_t</a> </td>
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<td class="paramname"><em>scaleFract</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">int8_t </td>
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<td class="paramname"><em>shift</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"><a class="el" href="arm__math__types_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea">q15_t</a> * </td>
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<td class="paramname"><em>pDst</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>blockSize</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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</tr>
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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">pSrc</td><td>points to the input vector </td></tr>
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<tr><td class="paramdir">[in]</td><td class="paramname">scaleFract</td><td>fractional portion of the scale value </td></tr>
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<tr><td class="paramdir">[in]</td><td class="paramname">shift</td><td>number of bits to shift the result by </td></tr>
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<tr><td class="paramdir">[out]</td><td class="paramname">pDst</td><td>points to the output vector </td></tr>
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<tr><td class="paramdir">[in]</td><td class="paramname">blockSize</td><td>number of samples in each vector </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>Scaling and Overflow Behavior</dt><dd>The input data <code>*pSrc</code> and <code>scaleFract</code> are in 1.15 format. These are multiplied to yield a 2.30 intermediate result and this is shifted with saturation to 1.15 format. </dd></dl>
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</div>
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</div>
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<a id="ga8b2b6ea2e39ca464e8f2cfdd937c022b" name="ga8b2b6ea2e39ca464e8f2cfdd937c022b"></a>
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<h2 class="memtitle"><span class="permalink"><a href="#ga8b2b6ea2e39ca464e8f2cfdd937c022b">◆ </a></span>arm_scale_q31()</h2>
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<div class="memitem">
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<div class="memproto">
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<table class="memname">
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<tr>
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<td class="memname">void arm_scale_q31 </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>pSrc</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"><a class="el" href="arm__math__types_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> </td>
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<td class="paramname"><em>scaleFract</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">int8_t </td>
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<td class="paramname"><em>shift</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"><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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</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>blockSize</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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</tr>
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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">pSrc</td><td>points to the input vector </td></tr>
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<tr><td class="paramdir">[in]</td><td class="paramname">scaleFract</td><td>fractional portion of the scale value </td></tr>
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<tr><td class="paramdir">[in]</td><td class="paramname">shift</td><td>number of bits to shift the result by </td></tr>
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<tr><td class="paramdir">[out]</td><td class="paramname">pDst</td><td>points to the output vector </td></tr>
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<tr><td class="paramdir">[in]</td><td class="paramname">blockSize</td><td>number of samples in each vector </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>Scaling and Overflow Behavior</dt><dd>The input data <code>*pSrc</code> and <code>scaleFract</code> are in 1.31 format. These are multiplied to yield a 2.62 intermediate result and this is shifted with saturation to 1.31 format. There is an intermediate shift by 32 to go from the 2.62 to 1.31 format. The shift argument is applied on the 1.31 result and not to the intermediate 2.62 format. </dd></dl>
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</div>
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</div>
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<a id="ga0d135086c6b813251b47a0d127b75eb8" name="ga0d135086c6b813251b47a0d127b75eb8"></a>
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<h2 class="memtitle"><span class="permalink"><a href="#ga0d135086c6b813251b47a0d127b75eb8">◆ </a></span>arm_scale_q7()</h2>
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<div class="memitem">
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<div class="memproto">
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<table class="memname">
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<tr>
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<td class="memname">void arm_scale_q7 </td>
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<td>(</td>
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<td class="paramtype">const <a class="el" href="arm__math__types_8h.html#ae541b6f232c305361e9b416fc9eed263">q7_t</a> * </td>
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<td class="paramname"><em>pSrc</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"><a class="el" href="arm__math__types_8h.html#ae541b6f232c305361e9b416fc9eed263">q7_t</a> </td>
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<td class="paramname"><em>scaleFract</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">int8_t </td>
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<td class="paramname"><em>shift</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"><a class="el" href="arm__math__types_8h.html#ae541b6f232c305361e9b416fc9eed263">q7_t</a> * </td>
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<td class="paramname"><em>pDst</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>blockSize</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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</tr>
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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">pSrc</td><td>points to the input vector </td></tr>
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<tr><td class="paramdir">[in]</td><td class="paramname">scaleFract</td><td>fractional portion of the scale value </td></tr>
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<tr><td class="paramdir">[in]</td><td class="paramname">shift</td><td>number of bits to shift the result by </td></tr>
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<tr><td class="paramdir">[out]</td><td class="paramname">pDst</td><td>points to the output vector </td></tr>
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<tr><td class="paramdir">[in]</td><td class="paramname">blockSize</td><td>number of samples in each vector </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>Scaling and Overflow Behavior</dt><dd>The input data <code>*pSrc</code> and <code>scaleFract</code> are in 1.7 format. These are multiplied to yield a 2.14 intermediate result and this is shifted with saturation to 1.7 format. </dd></dl>
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</div>
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</div>
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