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<a href="#func-members">Functions</a> </div>
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<div class="headertitle"><div class="title">Vector Shift<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:gab7a2f614c2fcee25cb8bae4c2a6bc3ab"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group__BasicShift.html#gab7a2f614c2fcee25cb8bae4c2a6bc3ab">arm_shift_q15</a> (const <a class="el" href="arm__math__types_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea">q15_t</a> *pSrc, int8_t shiftBits, <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:gab7a2f614c2fcee25cb8bae4c2a6bc3ab"><td class="mdescLeft"> </td><td class="mdescRight">Shifts the elements of a Q15 vector a specified number of bits. <a href="group__BasicShift.html#gab7a2f614c2fcee25cb8bae4c2a6bc3ab">More...</a><br /></td></tr>
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<tr class="separator:gab7a2f614c2fcee25cb8bae4c2a6bc3ab"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:gabc69335d1cf2eba1c469c8c8291f3589"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group__BasicShift.html#gabc69335d1cf2eba1c469c8c8291f3589">arm_shift_q31</a> (const <a class="el" href="arm__math__types_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> *pSrc, int8_t shiftBits, <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:gabc69335d1cf2eba1c469c8c8291f3589"><td class="mdescLeft"> </td><td class="mdescRight">Shifts the elements of a Q31 vector a specified number of bits. <a href="group__BasicShift.html#gabc69335d1cf2eba1c469c8c8291f3589">More...</a><br /></td></tr>
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<tr class="separator:gabc69335d1cf2eba1c469c8c8291f3589"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:ga87bbb3db84f2af6c38f4fc17cbecfd2e"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group__BasicShift.html#ga87bbb3db84f2af6c38f4fc17cbecfd2e">arm_shift_q7</a> (const <a class="el" href="arm__math__types_8h.html#ae541b6f232c305361e9b416fc9eed263">q7_t</a> *pSrc, int8_t shiftBits, <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:ga87bbb3db84f2af6c38f4fc17cbecfd2e"><td class="mdescLeft"> </td><td class="mdescRight">Shifts the elements of a Q7 vector a specified number of bits. <a href="group__BasicShift.html#ga87bbb3db84f2af6c38f4fc17cbecfd2e">More...</a><br /></td></tr>
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<tr class="separator:ga87bbb3db84f2af6c38f4fc17cbecfd2e"><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 >Shifts the elements of a fixed-point vector by a specified number of bits. There are separate functions for Q7, Q15, and Q31 data types. The underlying algorithm used is:</p>
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<pre>
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pDst[n] = pSrc[n] << shift, 0 <= n < blockSize.
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</pre><p >If <code>shift</code> is positive then the elements of the vector are shifted to the left. If <code>shift</code> is negative then the elements of the vector are shifted to the right.</p>
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<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="gab7a2f614c2fcee25cb8bae4c2a6bc3ab" name="gab7a2f614c2fcee25cb8bae4c2a6bc3ab"></a>
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<h2 class="memtitle"><span class="permalink"><a href="#gab7a2f614c2fcee25cb8bae4c2a6bc3ab">◆ </a></span>arm_shift_q15()</h2>
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<div class="memitem">
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<td class="memname">void arm_shift_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">int8_t </td>
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<td class="paramname"><em>shiftBits</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">shiftBits</td><td>number of bits to shift. A positive value shifts left; a negative value shifts right. </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 function uses saturating arithmetic. Results outside of the allowable Q15 range [0x8000 0x7FFF] are saturated. </dd></dl>
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</div>
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</div>
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<a id="gabc69335d1cf2eba1c469c8c8291f3589" name="gabc69335d1cf2eba1c469c8c8291f3589"></a>
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<h2 class="memtitle"><span class="permalink"><a href="#gabc69335d1cf2eba1c469c8c8291f3589">◆ </a></span>arm_shift_q31()</h2>
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<td class="memname">void arm_shift_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">int8_t </td>
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<td class="paramname"><em>shiftBits</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">shiftBits</td><td>number of bits to shift. A positive value shifts left; a negative value shifts right. </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 the 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 function uses saturating arithmetic. Results outside of the allowable Q31 range [0x80000000 0x7FFFFFFF] are saturated. </dd></dl>
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</div>
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</div>
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<a id="ga87bbb3db84f2af6c38f4fc17cbecfd2e" name="ga87bbb3db84f2af6c38f4fc17cbecfd2e"></a>
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<h2 class="memtitle"><span class="permalink"><a href="#ga87bbb3db84f2af6c38f4fc17cbecfd2e">◆ </a></span>arm_shift_q7()</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_shift_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">int8_t </td>
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<td class="paramname"><em>shiftBits</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">shiftBits</td><td>number of bits to shift. A positive value shifts left; a negative value shifts right. </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>onditions for optimum performance</dt><dd>Input and output buffers should be aligned by 32-bit </dd></dl>
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<dl class="section user"><dt>Scaling and Overflow Behavior</dt><dd>The function uses saturating arithmetic. Results outside of the allowable Q7 range [0x80 0x7F] are saturated. </dd></dl>
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</div>
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