group___cmplx_by_cmplx_mult.html 17 KB

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  109. <a href="#func-members">Functions</a> </div>
  110. <div class="headertitle">
  111. <div class="title">Complex-by-Complex Multiplication</div> </div>
  112. <div class="ingroups"><a class="el" href="group__group_cmplx_math.html">Complex Math Functions</a></div></div><!--header-->
  113. <div class="contents">
  114. <table class="memberdecls">
  115. <tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="func-members"></a>
  116. Functions</h2></td></tr>
  117. <tr class="memitem:ga14b47080054a1ba1250a86805be1ff6b"><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group___cmplx_by_cmplx_mult.html#ga14b47080054a1ba1250a86805be1ff6b">arm_cmplx_mult_cmplx_f32</a> (<a class="el" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715">float32_t</a> *pSrcA, <a class="el" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715">float32_t</a> *pSrcB, <a class="el" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715">float32_t</a> *pDst, uint32_t numSamples)</td></tr>
  118. <tr class="memdesc:ga14b47080054a1ba1250a86805be1ff6b"><td class="mdescLeft">&#160;</td><td class="mdescRight">Floating-point complex-by-complex multiplication. <a href="#ga14b47080054a1ba1250a86805be1ff6b"></a><br/></td></tr>
  119. <tr class="separator:ga14b47080054a1ba1250a86805be1ff6b"><td class="memSeparator" colspan="2">&#160;</td></tr>
  120. <tr class="memitem:ga67e96abfc9c3e30efb70a2ec9d0fe7e8"><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group___cmplx_by_cmplx_mult.html#ga67e96abfc9c3e30efb70a2ec9d0fe7e8">arm_cmplx_mult_cmplx_q15</a> (<a class="el" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea">q15_t</a> *pSrcA, <a class="el" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea">q15_t</a> *pSrcB, <a class="el" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea">q15_t</a> *pDst, uint32_t numSamples)</td></tr>
  121. <tr class="memdesc:ga67e96abfc9c3e30efb70a2ec9d0fe7e8"><td class="mdescLeft">&#160;</td><td class="mdescRight">Q15 complex-by-complex multiplication. <a href="#ga67e96abfc9c3e30efb70a2ec9d0fe7e8"></a><br/></td></tr>
  122. <tr class="separator:ga67e96abfc9c3e30efb70a2ec9d0fe7e8"><td class="memSeparator" colspan="2">&#160;</td></tr>
  123. <tr class="memitem:ga1829e50993a90742de225a0ce4213838"><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group___cmplx_by_cmplx_mult.html#ga1829e50993a90742de225a0ce4213838">arm_cmplx_mult_cmplx_q31</a> (<a class="el" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> *pSrcA, <a class="el" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> *pSrcB, <a class="el" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> *pDst, uint32_t numSamples)</td></tr>
  124. <tr class="memdesc:ga1829e50993a90742de225a0ce4213838"><td class="mdescLeft">&#160;</td><td class="mdescRight">Q31 complex-by-complex multiplication. <a href="#ga1829e50993a90742de225a0ce4213838"></a><br/></td></tr>
  125. <tr class="separator:ga1829e50993a90742de225a0ce4213838"><td class="memSeparator" colspan="2">&#160;</td></tr>
  126. </table>
  127. <a name="details" id="details"></a><h2 class="groupheader">Description</h2>
  128. <p>Multiplies a complex vector by another complex vector and generates a complex result. The data in the complex arrays is stored in an interleaved fashion (real, imag, real, imag, ...). The parameter <code>numSamples</code> represents the number of complex samples processed. The complex arrays have a total of <code>2*numSamples</code> real values.</p>
  129. <p>The underlying algorithm is used:</p>
  130. <pre>
  131. for(n=0; n&lt;numSamples; n++) {
  132. pDst[(2*n)+0] = pSrcA[(2*n)+0] * pSrcB[(2*n)+0] - pSrcA[(2*n)+1] * pSrcB[(2*n)+1];
  133. pDst[(2*n)+1] = pSrcA[(2*n)+0] * pSrcB[(2*n)+1] + pSrcA[(2*n)+1] * pSrcB[(2*n)+0];
  134. }
  135. </pre><p>There are separate functions for floating-point, Q15, and Q31 data types. </p>
  136. <h2 class="groupheader">Function Documentation</h2>
  137. <a class="anchor" id="ga14b47080054a1ba1250a86805be1ff6b"></a>
  138. <div class="memitem">
  139. <div class="memproto">
  140. <table class="memname">
  141. <tr>
  142. <td class="memname">void arm_cmplx_mult_cmplx_f32 </td>
  143. <td>(</td>
  144. <td class="paramtype"><a class="el" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715">float32_t</a> *&#160;</td>
  145. <td class="paramname"><em>pSrcA</em>, </td>
  146. </tr>
  147. <tr>
  148. <td class="paramkey"></td>
  149. <td></td>
  150. <td class="paramtype"><a class="el" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715">float32_t</a> *&#160;</td>
  151. <td class="paramname"><em>pSrcB</em>, </td>
  152. </tr>
  153. <tr>
  154. <td class="paramkey"></td>
  155. <td></td>
  156. <td class="paramtype"><a class="el" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715">float32_t</a> *&#160;</td>
  157. <td class="paramname"><em>pDst</em>, </td>
  158. </tr>
  159. <tr>
  160. <td class="paramkey"></td>
  161. <td></td>
  162. <td class="paramtype">uint32_t&#160;</td>
  163. <td class="paramname"><em>numSamples</em>&#160;</td>
  164. </tr>
  165. <tr>
  166. <td></td>
  167. <td>)</td>
  168. <td></td><td></td>
  169. </tr>
  170. </table>
  171. </div><div class="memdoc">
  172. <dl class="params"><dt>Parameters</dt><dd>
  173. <table class="params">
  174. <tr><td class="paramdir">[in]</td><td class="paramname">*pSrcA</td><td>points to the first input vector </td></tr>
  175. <tr><td class="paramdir">[in]</td><td class="paramname">*pSrcB</td><td>points to the second input vector </td></tr>
  176. <tr><td class="paramdir">[out]</td><td class="paramname">*pDst</td><td>points to the output vector </td></tr>
  177. <tr><td class="paramdir">[in]</td><td class="paramname">numSamples</td><td>number of complex samples in each vector </td></tr>
  178. </table>
  179. </dd>
  180. </dl>
  181. <dl class="section return"><dt>Returns</dt><dd>none. </dd></dl>
  182. <dl><dt><b>Examples: </b></dt><dd><a class="el" href="arm_convolution_example_f32_8c-example.html#a18">arm_convolution_example_f32.c</a>.</dd>
  183. </dl>
  184. <p>Referenced by <a class="el" href="_a_r_m_2arm__convolution__example__f32_8c.html#a52d2cba30e6946c95578be946ac12a65">main()</a>.</p>
  185. </div>
  186. </div>
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  188. <div class="memitem">
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  191. <tr>
  192. <td class="memname">void arm_cmplx_mult_cmplx_q15 </td>
  193. <td>(</td>
  194. <td class="paramtype"><a class="el" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea">q15_t</a> *&#160;</td>
  195. <td class="paramname"><em>pSrcA</em>, </td>
  196. </tr>
  197. <tr>
  198. <td class="paramkey"></td>
  199. <td></td>
  200. <td class="paramtype"><a class="el" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea">q15_t</a> *&#160;</td>
  201. <td class="paramname"><em>pSrcB</em>, </td>
  202. </tr>
  203. <tr>
  204. <td class="paramkey"></td>
  205. <td></td>
  206. <td class="paramtype"><a class="el" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea">q15_t</a> *&#160;</td>
  207. <td class="paramname"><em>pDst</em>, </td>
  208. </tr>
  209. <tr>
  210. <td class="paramkey"></td>
  211. <td></td>
  212. <td class="paramtype">uint32_t&#160;</td>
  213. <td class="paramname"><em>numSamples</em>&#160;</td>
  214. </tr>
  215. <tr>
  216. <td></td>
  217. <td>)</td>
  218. <td></td><td></td>
  219. </tr>
  220. </table>
  221. </div><div class="memdoc">
  222. <dl class="params"><dt>Parameters</dt><dd>
  223. <table class="params">
  224. <tr><td class="paramdir">[in]</td><td class="paramname">*pSrcA</td><td>points to the first input vector </td></tr>
  225. <tr><td class="paramdir">[in]</td><td class="paramname">*pSrcB</td><td>points to the second input vector </td></tr>
  226. <tr><td class="paramdir">[out]</td><td class="paramname">*pDst</td><td>points to the output vector </td></tr>
  227. <tr><td class="paramdir">[in]</td><td class="paramname">numSamples</td><td>number of complex samples in each vector </td></tr>
  228. </table>
  229. </dd>
  230. </dl>
  231. <dl class="section return"><dt>Returns</dt><dd>none.</dd></dl>
  232. <p><b>Scaling and Overflow Behavior:</b> </p>
  233. <dl class="section user"><dt></dt><dd>The function implements 1.15 by 1.15 multiplications and finally output is converted into 3.13 format. </dd></dl>
  234. </div>
  235. </div>
  236. <a class="anchor" id="ga1829e50993a90742de225a0ce4213838"></a>
  237. <div class="memitem">
  238. <div class="memproto">
  239. <table class="memname">
  240. <tr>
  241. <td class="memname">void arm_cmplx_mult_cmplx_q31 </td>
  242. <td>(</td>
  243. <td class="paramtype"><a class="el" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> *&#160;</td>
  244. <td class="paramname"><em>pSrcA</em>, </td>
  245. </tr>
  246. <tr>
  247. <td class="paramkey"></td>
  248. <td></td>
  249. <td class="paramtype"><a class="el" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> *&#160;</td>
  250. <td class="paramname"><em>pSrcB</em>, </td>
  251. </tr>
  252. <tr>
  253. <td class="paramkey"></td>
  254. <td></td>
  255. <td class="paramtype"><a class="el" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> *&#160;</td>
  256. <td class="paramname"><em>pDst</em>, </td>
  257. </tr>
  258. <tr>
  259. <td class="paramkey"></td>
  260. <td></td>
  261. <td class="paramtype">uint32_t&#160;</td>
  262. <td class="paramname"><em>numSamples</em>&#160;</td>
  263. </tr>
  264. <tr>
  265. <td></td>
  266. <td>)</td>
  267. <td></td><td></td>
  268. </tr>
  269. </table>
  270. </div><div class="memdoc">
  271. <dl class="params"><dt>Parameters</dt><dd>
  272. <table class="params">
  273. <tr><td class="paramdir">[in]</td><td class="paramname">*pSrcA</td><td>points to the first input vector </td></tr>
  274. <tr><td class="paramdir">[in]</td><td class="paramname">*pSrcB</td><td>points to the second input vector </td></tr>
  275. <tr><td class="paramdir">[out]</td><td class="paramname">*pDst</td><td>points to the output vector </td></tr>
  276. <tr><td class="paramdir">[in]</td><td class="paramname">numSamples</td><td>number of complex samples in each vector </td></tr>
  277. </table>
  278. </dd>
  279. </dl>
  280. <dl class="section return"><dt>Returns</dt><dd>none.</dd></dl>
  281. <p><b>Scaling and Overflow Behavior:</b> </p>
  282. <dl class="section user"><dt></dt><dd>The function implements 1.31 by 1.31 multiplications and finally output is converted into 3.29 format. Input down scaling is not required. </dd></dl>
  283. <p>Referenced by <a class="el" href="group___d_c_t4___i_d_c_t4.html#gad04d0baab6ed081d8e8afe02538eb80b">arm_dct4_q31()</a>.</p>
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