<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/xhtml;charset=UTF-8"/> <meta http-equiv="X-UA-Compatible" content="IE=9"/> <title>Complex FFT Tables</title> <title>CMSIS-DSP: Complex FFT Tables</title> <link href="tabs.css" rel="stylesheet" type="text/css"/> <link href="cmsis.css" rel="stylesheet" type="text/css" /> <script type="text/javascript" src="jquery.js"></script> <script type="text/javascript" src="dynsections.js"></script> <script type="text/javascript" src="printComponentTabs.js"></script> <link href="navtree.css" rel="stylesheet" type="text/css"/> <script type="text/javascript" src="resize.js"></script> <script type="text/javascript" src="navtree.js"></script> <script type="text/javascript"> $(document).ready(initResizable); $(window).load(resizeHeight); </script> <link href="search/search.css" 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class="separator:gae247e83ad50d474107254e25b36ad42b"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:gae75e243ec61706427314270f222e0c8e"><td class="memItemLeft" align="right" valign="top">const <a class="el" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715">float32_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__CFFT__CIFFT.html#gae75e243ec61706427314270f222e0c8e">twiddleCoef_16</a> [32]</td></tr> <tr class="separator:gae75e243ec61706427314270f222e0c8e"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:ga78a72c85d88185de98050c930cfc76e3"><td class="memItemLeft" align="right" valign="top">const <a class="el" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715">float32_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__CFFT__CIFFT.html#ga78a72c85d88185de98050c930cfc76e3">twiddleCoef_32</a> [64]</td></tr> <tr class="separator:ga78a72c85d88185de98050c930cfc76e3"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:ga4f3c6d98c7e66393b4ef3ac63746e43d"><td class="memItemLeft" align="right" valign="top">const <a class="el" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715">float32_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__CFFT__CIFFT.html#ga4f3c6d98c7e66393b4ef3ac63746e43d">twiddleCoef_64</a> [128]</td></tr> <tr class="separator:ga4f3c6d98c7e66393b4ef3ac63746e43d"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:ga948433536dafaac1381decfccf4e2d9c"><td class="memItemLeft" align="right" valign="top">const <a class="el" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715">float32_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__CFFT__CIFFT.html#ga948433536dafaac1381decfccf4e2d9c">twiddleCoef_128</a> [256]</td></tr> <tr class="separator:ga948433536dafaac1381decfccf4e2d9c"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:gafe813758a03a798e972359a092315be4"><td class="memItemLeft" align="right" valign="top">const <a class="el" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715">float32_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__CFFT__CIFFT.html#gafe813758a03a798e972359a092315be4">twiddleCoef_256</a> [512]</td></tr> <tr class="separator:gafe813758a03a798e972359a092315be4"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:gad8830f0c068ab2cc19f2f87d220fa148"><td class="memItemLeft" align="right" valign="top">const <a class="el" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715">float32_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__CFFT__CIFFT.html#gad8830f0c068ab2cc19f2f87d220fa148">twiddleCoef_512</a> [1024]</td></tr> <tr class="separator:gad8830f0c068ab2cc19f2f87d220fa148"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:ga27c056eb130a4333d1cc5dd43ec738b1"><td class="memItemLeft" align="right" valign="top">const <a class="el" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715">float32_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__CFFT__CIFFT.html#ga27c056eb130a4333d1cc5dd43ec738b1">twiddleCoef_1024</a> [2048]</td></tr> <tr class="separator:ga27c056eb130a4333d1cc5dd43ec738b1"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:ga23e7f30421a7905b21c2015429779633"><td class="memItemLeft" align="right" valign="top">const <a class="el" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715">float32_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__CFFT__CIFFT.html#ga23e7f30421a7905b21c2015429779633">twiddleCoef_2048</a> [4096]</td></tr> <tr class="separator:ga23e7f30421a7905b21c2015429779633"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:gae0182d1dd3b2f21aad4e38a815a0bd40"><td class="memItemLeft" align="right" valign="top">const <a class="el" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715">float32_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__CFFT__CIFFT.html#gae0182d1dd3b2f21aad4e38a815a0bd40">twiddleCoef_4096</a> [8192]</td></tr> <tr class="separator:gae0182d1dd3b2f21aad4e38a815a0bd40"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:gaef4697e1ba348c4ac9358f2b9e279e93"><td class="memItemLeft" align="right" valign="top">const <a class="el" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__CFFT__CIFFT.html#gaef4697e1ba348c4ac9358f2b9e279e93">twiddleCoef_16_q31</a> [24]</td></tr> <tr class="separator:gaef4697e1ba348c4ac9358f2b9e279e93"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:ga8ba78d5e6ef4bdc58e8f0044e0664a0a"><td class="memItemLeft" align="right" valign="top">const <a class="el" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__CFFT__CIFFT.html#ga8ba78d5e6ef4bdc58e8f0044e0664a0a">twiddleCoef_32_q31</a> [48]</td></tr> <tr class="separator:ga8ba78d5e6ef4bdc58e8f0044e0664a0a"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:ga6e0a7e941a25a0d74b2e6590307de47e"><td class="memItemLeft" align="right" valign="top">const <a class="el" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__CFFT__CIFFT.html#ga6e0a7e941a25a0d74b2e6590307de47e">twiddleCoef_64_q31</a> [96]</td></tr> <tr class="separator:ga6e0a7e941a25a0d74b2e6590307de47e"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:gafecf9ed9873415d9f5f17f37b30c7250"><td class="memItemLeft" align="right" valign="top">const <a class="el" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__CFFT__CIFFT.html#gafecf9ed9873415d9f5f17f37b30c7250">twiddleCoef_128_q31</a> [192]</td></tr> <tr class="separator:gafecf9ed9873415d9f5f17f37b30c7250"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:gaef1ea005053b715b851cf5f908168ede"><td class="memItemLeft" align="right" valign="top">const <a class="el" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__CFFT__CIFFT.html#gaef1ea005053b715b851cf5f908168ede">twiddleCoef_256_q31</a> [384]</td></tr> <tr class="separator:gaef1ea005053b715b851cf5f908168ede"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:ga416c61b2f08542a39111e06b0378bebe"><td class="memItemLeft" align="right" valign="top">const <a class="el" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__CFFT__CIFFT.html#ga416c61b2f08542a39111e06b0378bebe">twiddleCoef_512_q31</a> [768]</td></tr> <tr class="separator:ga416c61b2f08542a39111e06b0378bebe"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:ga514443c44b62b8b3d240afefebcda310"><td class="memItemLeft" align="right" valign="top">const <a class="el" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__CFFT__CIFFT.html#ga514443c44b62b8b3d240afefebcda310">twiddleCoef_1024_q31</a> [1536]</td></tr> <tr class="separator:ga514443c44b62b8b3d240afefebcda310"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:ga9c5767de9f5a409fd0c2027e6ac67179"><td class="memItemLeft" align="right" valign="top">const <a class="el" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__CFFT__CIFFT.html#ga9c5767de9f5a409fd0c2027e6ac67179">twiddleCoef_2048_q31</a> [3072]</td></tr> <tr class="separator:ga9c5767de9f5a409fd0c2027e6ac67179"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:ga67c0890317deab3391e276f22c1fc400"><td class="memItemLeft" align="right" valign="top">const <a class="el" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__CFFT__CIFFT.html#ga67c0890317deab3391e276f22c1fc400">twiddleCoef_4096_q31</a> [6144]</td></tr> <tr class="separator:ga67c0890317deab3391e276f22c1fc400"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:ga8e4e2e05f4a3112184c96cb3308d6c39"><td class="memItemLeft" align="right" valign="top">const <a class="el" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea">q15_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__CFFT__CIFFT.html#ga8e4e2e05f4a3112184c96cb3308d6c39">twiddleCoef_16_q15</a> [24]</td></tr> <tr class="separator:ga8e4e2e05f4a3112184c96cb3308d6c39"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:gac194a4fe04a19051ae1811f69c6e5df2"><td class="memItemLeft" align="right" valign="top">const <a class="el" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea">q15_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__CFFT__CIFFT.html#gac194a4fe04a19051ae1811f69c6e5df2">twiddleCoef_32_q15</a> [48]</td></tr> <tr class="separator:gac194a4fe04a19051ae1811f69c6e5df2"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:gaa0cc411e0b3c82078e85cfdf1b84290f"><td class="memItemLeft" align="right" valign="top">const <a class="el" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea">q15_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__CFFT__CIFFT.html#gaa0cc411e0b3c82078e85cfdf1b84290f">twiddleCoef_64_q15</a> [96]</td></tr> <tr class="separator:gaa0cc411e0b3c82078e85cfdf1b84290f"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:gabfdd1c5cd2b3f96da5fe5f07c707a8e5"><td class="memItemLeft" align="right" valign="top">const <a class="el" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea">q15_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__CFFT__CIFFT.html#gabfdd1c5cd2b3f96da5fe5f07c707a8e5">twiddleCoef_128_q15</a> [192]</td></tr> <tr class="separator:gabfdd1c5cd2b3f96da5fe5f07c707a8e5"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:ga6099ae5262a0a3a8d9ce1e6da02f0c2e"><td class="memItemLeft" align="right" valign="top">const <a class="el" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea">q15_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__CFFT__CIFFT.html#ga6099ae5262a0a3a8d9ce1e6da02f0c2e">twiddleCoef_256_q15</a> [384]</td></tr> <tr class="separator:ga6099ae5262a0a3a8d9ce1e6da02f0c2e"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:ga6152621af210f847128c6f38958fa385"><td class="memItemLeft" align="right" valign="top">const <a class="el" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea">q15_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__CFFT__CIFFT.html#ga6152621af210f847128c6f38958fa385">twiddleCoef_512_q15</a> [768]</td></tr> <tr class="separator:ga6152621af210f847128c6f38958fa385"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:ga8a0ec95d866fe96b740e77d6e1356b59"><td class="memItemLeft" align="right" valign="top">const <a class="el" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea">q15_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__CFFT__CIFFT.html#ga8a0ec95d866fe96b740e77d6e1356b59">twiddleCoef_1024_q15</a> [1536]</td></tr> <tr class="separator:ga8a0ec95d866fe96b740e77d6e1356b59"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:gadd16ce08ffd1048c385e0534a3b19cbb"><td class="memItemLeft" align="right" valign="top">const <a class="el" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea">q15_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__CFFT__CIFFT.html#gadd16ce08ffd1048c385e0534a3b19cbb">twiddleCoef_2048_q15</a> [3072]</td></tr> <tr class="separator:gadd16ce08ffd1048c385e0534a3b19cbb"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:ga9b409d6995eab17805b1d1881d4bc652"><td class="memItemLeft" align="right" valign="top">const <a class="el" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea">q15_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__CFFT__CIFFT.html#ga9b409d6995eab17805b1d1881d4bc652">twiddleCoef_4096_q15</a> [6144]</td></tr> <tr class="separator:ga9b409d6995eab17805b1d1881d4bc652"><td class="memSeparator" colspan="2"> </td></tr> </table> <a name="details" id="details"></a><h2 class="groupheader">Description</h2> <h2 class="groupheader">Variable Documentation</h2> <a class="anchor" id="gae247e83ad50d474107254e25b36ad42b"></a> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <td class="memname">const uint16_t armBitRevTable[1024]</td> </tr> </table> </div><div class="memdoc"> <dl class="section user"><dt></dt><dd>Pseudo code for Generation of Bit reversal Table is </dd></dl> <dl class="section user"><dt></dt><dd><pre>for(l=1;l <= N/4;l++) { for(i=0;i<logN2;i++) { a[i]=l&(1<<i); } for(j=0; j<logN2; j++) { if (a[j]!=0) y[l]+=(1<<((logN2-1)-j)); } y[l] = y[l] >> 1; } </pre> </dd></dl> <dl class="section user"><dt></dt><dd>where N = 4096 logN2 = 12 </dd></dl> <dl class="section user"><dt></dt><dd>N is the maximum FFT Size supported </dd></dl> <p>Referenced by <a class="el" href="group__ComplexFFT.html#gac9565e6bc7229577ecf5e090313cafd7">arm_cfft_radix2_init_f32()</a>, <a class="el" href="group__ComplexFFT.html#ga5c5b2127b3c4ea2d03692127f8543858">arm_cfft_radix2_init_q15()</a>, <a class="el" href="group__ComplexFFT.html#gabec9611e77382f31e152668bf6b4b638">arm_cfft_radix2_init_q31()</a>, <a class="el" href="group__ComplexFFT.html#gaf336459f684f0b17bfae539ef1b1b78a">arm_cfft_radix4_init_f32()</a>, <a class="el" href="group__ComplexFFT.html#ga0c2acfda3126c452e75b81669e8ad9ef">arm_cfft_radix4_init_q15()</a>, and <a class="el" href="group__ComplexFFT.html#gad5caaafeec900c8ff72321c01bbd462c">arm_cfft_radix4_init_q31()</a>.</p> </div> </div> <a class="anchor" id="ga27c056eb130a4333d1cc5dd43ec738b1"></a> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <td class="memname">const <a class="el" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715">float32_t</a> twiddleCoef_1024[2048]</td> </tr> </table> </div><div class="memdoc"> <dl class="section user"><dt></dt><dd>Example code for Floating-point Twiddle factors Generation: </dd></dl> <dl class="section user"><dt></dt><dd><pre>for(i = 0; i< N/; i++) { twiddleCoef[2*i]= cos(i * 2*PI/(float)N); twiddleCoef[2*i+1]= sin(i * 2*PI/(float)N); } </pre> </dd></dl> <dl class="section user"><dt></dt><dd>where N = 1024 and PI = 3.14159265358979 </dd></dl> <dl class="section user"><dt></dt><dd>Cos and Sin values are in interleaved fashion </dd></dl> <p>Referenced by <a class="el" href="group__RealFFT.html#gac5fceb172551e7c11eb4d0e17ef15aa3">arm_rfft_fast_init_f32()</a>.</p> </div> </div> <a class="anchor" id="ga8a0ec95d866fe96b740e77d6e1356b59"></a> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <td class="memname">const <a class="el" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea">q15_t</a> twiddleCoef_1024_q15[1536]</td> </tr> </table> </div><div class="memdoc"> <dl class="section user"><dt></dt><dd>Example code for q15 Twiddle factors Generation:: </dd></dl> <dl class="section user"><dt></dt><dd><pre>for(i = 0; i< 3N/4; i++) { twiddleCoefq15[2*i]= cos(i * 2*PI/(float)N); twiddleCoefq15[2*i+1]= sin(i * 2*PI/(float)N); } </pre> </dd></dl> <dl class="section user"><dt></dt><dd>where N = 1024 and PI = 3.14159265358979 </dd></dl> <dl class="section user"><dt></dt><dd>Cos and Sin values are interleaved fashion </dd></dl> <dl class="section user"><dt></dt><dd>Convert Floating point to q15(Fixed point 1.15): round(twiddleCoefq15(i) * pow(2, 15)) </dd></dl> </div> </div> <a class="anchor" id="ga514443c44b62b8b3d240afefebcda310"></a> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <td class="memname">const <a class="el" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> twiddleCoef_1024_q31[1536]</td> </tr> </table> </div><div class="memdoc"> <dl class="section user"><dt></dt><dd>Example code for Q31 Twiddle factors Generation:: </dd></dl> <dl class="section user"><dt></dt><dd><pre>for(i = 0; i< 3N/4; i++) { twiddleCoefQ31[2*i]= cos(i * 2*PI/(float)N); twiddleCoefQ31[2*i+1]= sin(i * 2*PI/(float)N); } </pre> </dd></dl> <dl class="section user"><dt></dt><dd>where N = 1024 and PI = 3.14159265358979 </dd></dl> <dl class="section user"><dt></dt><dd>Cos and Sin values are interleaved fashion </dd></dl> <dl class="section user"><dt></dt><dd>Convert Floating point to Q31(Fixed point 1.31): round(twiddleCoefQ31(i) * pow(2, 31)) </dd></dl> </div> </div> <a class="anchor" id="ga948433536dafaac1381decfccf4e2d9c"></a> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <td class="memname">const <a class="el" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715">float32_t</a> twiddleCoef_128[256]</td> </tr> </table> </div><div class="memdoc"> <dl class="section user"><dt></dt><dd>Example code for Floating-point Twiddle factors Generation: </dd></dl> <dl class="section user"><dt></dt><dd><pre>for(i = 0; i< N/; i++) { twiddleCoef[2*i]= cos(i * 2*PI/(float)N); twiddleCoef[2*i+1]= sin(i * 2*PI/(float)N); } </pre> </dd></dl> <dl class="section user"><dt></dt><dd>where N = 128 and PI = 3.14159265358979 </dd></dl> <dl class="section user"><dt></dt><dd>Cos and Sin values are in interleaved fashion </dd></dl> <p>Referenced by <a class="el" href="group__RealFFT.html#gac5fceb172551e7c11eb4d0e17ef15aa3">arm_rfft_fast_init_f32()</a>.</p> </div> </div> <a class="anchor" id="gabfdd1c5cd2b3f96da5fe5f07c707a8e5"></a> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <td class="memname">const <a class="el" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea">q15_t</a> twiddleCoef_128_q15[192]</td> </tr> </table> </div><div class="memdoc"> <dl class="section user"><dt></dt><dd>Example code for q15 Twiddle factors Generation:: </dd></dl> <dl class="section user"><dt></dt><dd><pre>for(i = 0; i< 3N/4; i++) { twiddleCoefq15[2*i]= cos(i * 2*PI/(float)N); twiddleCoefq15[2*i+1]= sin(i * 2*PI/(float)N); } </pre> </dd></dl> <dl class="section user"><dt></dt><dd>where N = 128 and PI = 3.14159265358979 </dd></dl> <dl class="section user"><dt></dt><dd>Cos and Sin values are interleaved fashion </dd></dl> <dl class="section user"><dt></dt><dd>Convert Floating point to q15(Fixed point 1.15): round(twiddleCoefq15(i) * pow(2, 15)) </dd></dl> </div> </div> <a class="anchor" id="gafecf9ed9873415d9f5f17f37b30c7250"></a> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <td class="memname">const <a class="el" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> twiddleCoef_128_q31[192]</td> </tr> </table> </div><div class="memdoc"> <dl class="section user"><dt></dt><dd>Example code for Q31 Twiddle factors Generation:: </dd></dl> <dl class="section user"><dt></dt><dd><pre>for(i = 0; i< 3N/4; i++) { twiddleCoefQ31[2*i]= cos(i * 2*PI/(float)N); twiddleCoefQ31[2*i+1]= sin(i * 2*PI/(float)N); } </pre> </dd></dl> <dl class="section user"><dt></dt><dd>where N = 128 and PI = 3.14159265358979 </dd></dl> <dl class="section user"><dt></dt><dd>Cos and Sin values are interleaved fashion </dd></dl> <dl class="section user"><dt></dt><dd>Convert Floating point to Q31(Fixed point 1.31): round(twiddleCoefQ31(i) * pow(2, 31)) </dd></dl> </div> </div> <a class="anchor" id="gae75e243ec61706427314270f222e0c8e"></a> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <td class="memname">const <a class="el" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715">float32_t</a> twiddleCoef_16[32]</td> </tr> </table> </div><div class="memdoc"> <dl class="section user"><dt></dt><dd>Example code for Floating-point Twiddle factors Generation: </dd></dl> <dl class="section user"><dt></dt><dd><pre>for(i = 0; i< N/; i++) { twiddleCoef[2*i]= cos(i * 2*PI/(float)N); twiddleCoef[2*i+1]= sin(i * 2*PI/(float)N); } </pre> </dd></dl> <dl class="section user"><dt></dt><dd>where N = 16 and PI = 3.14159265358979 </dd></dl> <dl class="section user"><dt></dt><dd>Cos and Sin values are in interleaved fashion </dd></dl> <p>Referenced by <a class="el" href="group__RealFFT.html#gac5fceb172551e7c11eb4d0e17ef15aa3">arm_rfft_fast_init_f32()</a>.</p> </div> </div> <a class="anchor" id="ga8e4e2e05f4a3112184c96cb3308d6c39"></a> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <td class="memname">const <a class="el" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea">q15_t</a> twiddleCoef_16_q15[24]</td> </tr> </table> </div><div class="memdoc"> <dl class="section user"><dt></dt><dd>Example code for q15 Twiddle factors Generation:: </dd></dl> <dl class="section user"><dt></dt><dd><pre>for(i = 0; i< 3N/4; i++) { twiddleCoefq15[2*i]= cos(i * 2*PI/(float)N); twiddleCoefq15[2*i+1]= sin(i * 2*PI/(float)N); } </pre> </dd></dl> <dl class="section user"><dt></dt><dd>where N = 16 and PI = 3.14159265358979 </dd></dl> <dl class="section user"><dt></dt><dd>Cos and Sin values are interleaved fashion </dd></dl> <dl class="section user"><dt></dt><dd>Convert Floating point to q15(Fixed point 1.15): round(twiddleCoefq15(i) * pow(2, 15)) </dd></dl> </div> </div> <a class="anchor" id="gaef4697e1ba348c4ac9358f2b9e279e93"></a> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <td class="memname">const <a class="el" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> twiddleCoef_16_q31[24]</td> </tr> </table> </div><div class="memdoc"> <dl class="section user"><dt></dt><dd>Example code for Q31 Twiddle factors Generation:: </dd></dl> <dl class="section user"><dt></dt><dd><pre>for(i = 0; i< 3N/4; i++) { twiddleCoefQ31[2*i]= cos(i * 2*PI/(float)N); twiddleCoefQ31[2*i+1]= sin(i * 2*PI/(float)N); } </pre> </dd></dl> <dl class="section user"><dt></dt><dd>where N = 16 and PI = 3.14159265358979 </dd></dl> <dl class="section user"><dt></dt><dd>Cos and Sin values are interleaved fashion </dd></dl> <dl class="section user"><dt></dt><dd>Convert Floating point to Q31(Fixed point 1.31): round(twiddleCoefQ31(i) * pow(2, 31)) </dd></dl> </div> </div> <a class="anchor" id="ga23e7f30421a7905b21c2015429779633"></a> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <td class="memname">const <a class="el" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715">float32_t</a> twiddleCoef_2048[4096]</td> </tr> </table> </div><div class="memdoc"> <dl class="section user"><dt></dt><dd>Example code for Floating-point Twiddle factors Generation: </dd></dl> <dl class="section user"><dt></dt><dd><pre>for(i = 0; i< N/; i++) { twiddleCoef[2*i]= cos(i * 2*PI/(float)N); twiddleCoef[2*i+1]= sin(i * 2*PI/(float)N); } </pre> </dd></dl> <dl class="section user"><dt></dt><dd>where N = 2048 and PI = 3.14159265358979 </dd></dl> <dl class="section user"><dt></dt><dd>Cos and Sin values are in interleaved fashion </dd></dl> <p>Referenced by <a class="el" href="group__RealFFT.html#gac5fceb172551e7c11eb4d0e17ef15aa3">arm_rfft_fast_init_f32()</a>.</p> </div> </div> <a class="anchor" id="gadd16ce08ffd1048c385e0534a3b19cbb"></a> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <td class="memname">const <a class="el" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea">q15_t</a> twiddleCoef_2048_q15[3072]</td> </tr> </table> </div><div class="memdoc"> <dl class="section user"><dt></dt><dd>Example code for q15 Twiddle factors Generation:: </dd></dl> <dl class="section user"><dt></dt><dd><pre>for(i = 0; i< 3N/4; i++) { twiddleCoefq15[2*i]= cos(i * 2*PI/(float)N); twiddleCoefq15[2*i+1]= sin(i * 2*PI/(float)N); } </pre> </dd></dl> <dl class="section user"><dt></dt><dd>where N = 2048 and PI = 3.14159265358979 </dd></dl> <dl class="section user"><dt></dt><dd>Cos and Sin values are interleaved fashion </dd></dl> <dl class="section user"><dt></dt><dd>Convert Floating point to q15(Fixed point 1.15): round(twiddleCoefq15(i) * pow(2, 15)) </dd></dl> </div> </div> <a class="anchor" id="ga9c5767de9f5a409fd0c2027e6ac67179"></a> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <td class="memname">const <a class="el" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> twiddleCoef_2048_q31[3072]</td> </tr> </table> </div><div class="memdoc"> <dl class="section user"><dt></dt><dd>Example code for Q31 Twiddle factors Generation:: </dd></dl> <dl class="section user"><dt></dt><dd><pre>for(i = 0; i< 3N/4; i++) { twiddleCoefQ31[2*i]= cos(i * 2*PI/(float)N); twiddleCoefQ31[2*i+1]= sin(i * 2*PI/(float)N); } </pre> </dd></dl> <dl class="section user"><dt></dt><dd>where N = 2048 and PI = 3.14159265358979 </dd></dl> <dl class="section user"><dt></dt><dd>Cos and Sin values are interleaved fashion </dd></dl> <dl class="section user"><dt></dt><dd>Convert Floating point to Q31(Fixed point 1.31): round(twiddleCoefQ31(i) * pow(2, 31)) </dd></dl> </div> </div> <a class="anchor" id="gafe813758a03a798e972359a092315be4"></a> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <td class="memname">const <a class="el" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715">float32_t</a> twiddleCoef_256[512]</td> </tr> </table> </div><div class="memdoc"> <dl class="section user"><dt></dt><dd>Example code for Floating-point Twiddle factors Generation: </dd></dl> <dl class="section user"><dt></dt><dd><pre>for(i = 0; i< N/; i++) { twiddleCoef[2*i]= cos(i * 2*PI/(float)N); twiddleCoef[2*i+1]= sin(i * 2*PI/(float)N); } </pre> </dd></dl> <dl class="section user"><dt></dt><dd>where N = 256 and PI = 3.14159265358979 </dd></dl> <dl class="section user"><dt></dt><dd>Cos and Sin values are in interleaved fashion </dd></dl> <p>Referenced by <a class="el" href="group__RealFFT.html#gac5fceb172551e7c11eb4d0e17ef15aa3">arm_rfft_fast_init_f32()</a>.</p> </div> </div> <a class="anchor" id="ga6099ae5262a0a3a8d9ce1e6da02f0c2e"></a> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <td class="memname">const <a class="el" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea">q15_t</a> twiddleCoef_256_q15[384]</td> </tr> </table> </div><div class="memdoc"> <dl class="section user"><dt></dt><dd>Example code for q15 Twiddle factors Generation:: </dd></dl> <dl class="section user"><dt></dt><dd><pre>for(i = 0; i< 3N/4; i++) { twiddleCoefq15[2*i]= cos(i * 2*PI/(float)N); twiddleCoefq15[2*i+1]= sin(i * 2*PI/(float)N); } </pre> </dd></dl> <dl class="section user"><dt></dt><dd>where N = 256 and PI = 3.14159265358979 </dd></dl> <dl class="section user"><dt></dt><dd>Cos and Sin values are interleaved fashion </dd></dl> <dl class="section user"><dt></dt><dd>Convert Floating point to q15(Fixed point 1.15): round(twiddleCoefq15(i) * pow(2, 15)) </dd></dl> </div> </div> <a class="anchor" id="gaef1ea005053b715b851cf5f908168ede"></a> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <td class="memname">const <a class="el" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> twiddleCoef_256_q31[384]</td> </tr> </table> </div><div class="memdoc"> <dl class="section user"><dt></dt><dd>Example code for Q31 Twiddle factors Generation:: </dd></dl> <dl class="section user"><dt></dt><dd><pre>for(i = 0; i< 3N/4; i++) { twiddleCoefQ31[2*i]= cos(i * 2*PI/(float)N); twiddleCoefQ31[2*i+1]= sin(i * 2*PI/(float)N); } </pre> </dd></dl> <dl class="section user"><dt></dt><dd>where N = 256 and PI = 3.14159265358979 </dd></dl> <dl class="section user"><dt></dt><dd>Cos and Sin values are interleaved fashion </dd></dl> <dl class="section user"><dt></dt><dd>Convert Floating point to Q31(Fixed point 1.31): round(twiddleCoefQ31(i) * pow(2, 31)) </dd></dl> </div> </div> <a class="anchor" id="ga78a72c85d88185de98050c930cfc76e3"></a> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <td class="memname">const <a class="el" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715">float32_t</a> twiddleCoef_32[64]</td> </tr> </table> </div><div class="memdoc"> <dl class="section user"><dt></dt><dd>Example code for Floating-point Twiddle factors Generation: </dd></dl> <dl class="section user"><dt></dt><dd><pre>for(i = 0; i< N/; i++) { twiddleCoef[2*i]= cos(i * 2*PI/(float)N); twiddleCoef[2*i+1]= sin(i * 2*PI/(float)N); } </pre> </dd></dl> <dl class="section user"><dt></dt><dd>where N = 32 and PI = 3.14159265358979 </dd></dl> <dl class="section user"><dt></dt><dd>Cos and Sin values are in interleaved fashion </dd></dl> <p>Referenced by <a class="el" href="group__RealFFT.html#gac5fceb172551e7c11eb4d0e17ef15aa3">arm_rfft_fast_init_f32()</a>.</p> </div> </div> <a class="anchor" id="gac194a4fe04a19051ae1811f69c6e5df2"></a> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <td class="memname">const <a class="el" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea">q15_t</a> twiddleCoef_32_q15[48]</td> </tr> </table> </div><div class="memdoc"> <dl class="section user"><dt></dt><dd>Example code for q15 Twiddle factors Generation:: </dd></dl> <dl class="section user"><dt></dt><dd><pre>for(i = 0; i< 3N/4; i++) { twiddleCoefq15[2*i]= cos(i * 2*PI/(float)N); twiddleCoefq15[2*i+1]= sin(i * 2*PI/(float)N); } </pre> </dd></dl> <dl class="section user"><dt></dt><dd>where N = 32 and PI = 3.14159265358979 </dd></dl> <dl class="section user"><dt></dt><dd>Cos and Sin values are interleaved fashion </dd></dl> <dl class="section user"><dt></dt><dd>Convert Floating point to q15(Fixed point 1.15): round(twiddleCoefq15(i) * pow(2, 15)) </dd></dl> </div> </div> <a class="anchor" id="ga8ba78d5e6ef4bdc58e8f0044e0664a0a"></a> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <td class="memname">const <a class="el" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> twiddleCoef_32_q31[48]</td> </tr> </table> </div><div class="memdoc"> <dl class="section user"><dt></dt><dd>Example code for Q31 Twiddle factors Generation:: </dd></dl> <dl class="section user"><dt></dt><dd><pre>for(i = 0; i< 3N/4; i++) { twiddleCoefQ31[2*i]= cos(i * 2*PI/(float)N); twiddleCoefQ31[2*i+1]= sin(i * 2*PI/(float)N); } </pre> </dd></dl> <dl class="section user"><dt></dt><dd>where N = 32 and PI = 3.14159265358979 </dd></dl> <dl class="section user"><dt></dt><dd>Cos and Sin values are interleaved fashion </dd></dl> <dl class="section user"><dt></dt><dd>Convert Floating point to Q31(Fixed point 1.31): round(twiddleCoefQ31(i) * pow(2, 31)) </dd></dl> </div> </div> <a class="anchor" id="gae0182d1dd3b2f21aad4e38a815a0bd40"></a> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <td class="memname">const <a class="el" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715">float32_t</a> twiddleCoef_4096[8192]</td> </tr> </table> </div><div class="memdoc"> <dl class="section user"><dt></dt><dd>Example code for Floating-point Twiddle factors Generation: </dd></dl> <dl class="section user"><dt></dt><dd><pre>for(i = 0; i< N/; i++) { twiddleCoef[2*i]= cos(i * 2*PI/(float)N); twiddleCoef[2*i+1]= sin(i * 2*PI/(float)N); } </pre> </dd></dl> <dl class="section user"><dt></dt><dd>where N = 4096 and PI = 3.14159265358979 </dd></dl> <dl class="section user"><dt></dt><dd>Cos and Sin values are in interleaved fashion </dd></dl> </div> </div> <a class="anchor" id="ga9b409d6995eab17805b1d1881d4bc652"></a> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <td class="memname">const <a class="el" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea">q15_t</a> twiddleCoef_4096_q15[6144]</td> </tr> </table> </div><div class="memdoc"> <dl class="section user"><dt></dt><dd>Example code for q15 Twiddle factors Generation:: </dd></dl> <dl class="section user"><dt></dt><dd><pre>for(i = 0; i< 3N/4; i++) { twiddleCoefq15[2*i]= cos(i * 2*PI/(float)N); twiddleCoefq15[2*i+1]= sin(i * 2*PI/(float)N); } </pre> </dd></dl> <dl class="section user"><dt></dt><dd>where N = 4096 and PI = 3.14159265358979 </dd></dl> <dl class="section user"><dt></dt><dd>Cos and Sin values are interleaved fashion </dd></dl> <dl class="section user"><dt></dt><dd>Convert Floating point to q15(Fixed point 1.15): round(twiddleCoefq15(i) * pow(2, 15)) </dd></dl> <p>Referenced by <a class="el" href="group__ComplexFFT.html#ga5c5b2127b3c4ea2d03692127f8543858">arm_cfft_radix2_init_q15()</a>, and <a class="el" href="group__ComplexFFT.html#ga0c2acfda3126c452e75b81669e8ad9ef">arm_cfft_radix4_init_q15()</a>.</p> </div> </div> <a class="anchor" id="ga67c0890317deab3391e276f22c1fc400"></a> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <td class="memname">const <a class="el" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> twiddleCoef_4096_q31[6144]</td> </tr> </table> </div><div class="memdoc"> <dl class="section user"><dt></dt><dd>Example code for Q31 Twiddle factors Generation:: </dd></dl> <dl class="section user"><dt></dt><dd><pre>for(i = 0; i< 3N/4; i++) { twiddleCoefQ31[2*i]= cos(i * 2*PI/(float)N); twiddleCoefQ31[2*i+1]= sin(i * 2*PI/(float)N); } </pre> </dd></dl> <dl class="section user"><dt></dt><dd>where N = 4096 and PI = 3.14159265358979 </dd></dl> <dl class="section user"><dt></dt><dd>Cos and Sin values are interleaved fashion </dd></dl> <dl class="section user"><dt></dt><dd>Convert Floating point to Q31(Fixed point 1.31): round(twiddleCoefQ31(i) * pow(2, 31)) </dd></dl> <p>Referenced by <a class="el" href="group__ComplexFFT.html#gabec9611e77382f31e152668bf6b4b638">arm_cfft_radix2_init_q31()</a>, and <a class="el" href="group__ComplexFFT.html#gad5caaafeec900c8ff72321c01bbd462c">arm_cfft_radix4_init_q31()</a>.</p> </div> </div> <a class="anchor" id="gad8830f0c068ab2cc19f2f87d220fa148"></a> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <td class="memname">const <a class="el" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715">float32_t</a> twiddleCoef_512[1024]</td> </tr> </table> </div><div class="memdoc"> <dl class="section user"><dt></dt><dd>Example code for Floating-point Twiddle factors Generation: </dd></dl> <dl class="section user"><dt></dt><dd><pre>for(i = 0; i< N/; i++) { twiddleCoef[2*i]= cos(i * 2*PI/(float)N); twiddleCoef[2*i+1]= sin(i * 2*PI/(float)N); } </pre> </dd></dl> <dl class="section user"><dt></dt><dd>where N = 512 and PI = 3.14159265358979 </dd></dl> <dl class="section user"><dt></dt><dd>Cos and Sin values are in interleaved fashion </dd></dl> <p>Referenced by <a class="el" href="group__RealFFT.html#gac5fceb172551e7c11eb4d0e17ef15aa3">arm_rfft_fast_init_f32()</a>.</p> </div> </div> <a class="anchor" id="ga6152621af210f847128c6f38958fa385"></a> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <td class="memname">const <a class="el" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea">q15_t</a> twiddleCoef_512_q15[768]</td> </tr> </table> </div><div class="memdoc"> <dl class="section user"><dt></dt><dd>Example code for q15 Twiddle factors Generation:: </dd></dl> <dl class="section user"><dt></dt><dd><pre>for(i = 0; i< 3N/4; i++) { twiddleCoefq15[2*i]= cos(i * 2*PI/(float)N); twiddleCoefq15[2*i+1]= sin(i * 2*PI/(float)N); } </pre> </dd></dl> <dl class="section user"><dt></dt><dd>where N = 512 and PI = 3.14159265358979 </dd></dl> <dl class="section user"><dt></dt><dd>Cos and Sin values are interleaved fashion </dd></dl> <dl class="section user"><dt></dt><dd>Convert Floating point to q15(Fixed point 1.15): round(twiddleCoefq15(i) * pow(2, 15)) </dd></dl> </div> </div> <a class="anchor" id="ga416c61b2f08542a39111e06b0378bebe"></a> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <td class="memname">const <a class="el" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> twiddleCoef_512_q31[768]</td> </tr> </table> </div><div class="memdoc"> <dl class="section user"><dt></dt><dd>Example code for Q31 Twiddle factors Generation:: </dd></dl> <dl class="section user"><dt></dt><dd><pre>for(i = 0; i< 3N/4; i++) { twiddleCoefQ31[2*i]= cos(i * 2*PI/(float)N); twiddleCoefQ31[2*i+1]= sin(i * 2*PI/(float)N); } </pre> </dd></dl> <dl class="section user"><dt></dt><dd>where N = 512 and PI = 3.14159265358979 </dd></dl> <dl class="section user"><dt></dt><dd>Cos and Sin values are interleaved fashion </dd></dl> <dl class="section user"><dt></dt><dd>Convert Floating point to Q31(Fixed point 1.31): round(twiddleCoefQ31(i) * pow(2, 31)) </dd></dl> </div> </div> <a class="anchor" id="ga4f3c6d98c7e66393b4ef3ac63746e43d"></a> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <td class="memname">const <a class="el" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715">float32_t</a> twiddleCoef_64[128]</td> </tr> </table> </div><div class="memdoc"> <dl class="section user"><dt></dt><dd>Example code for Floating-point Twiddle factors Generation: </dd></dl> <dl class="section user"><dt></dt><dd><pre>for(i = 0; i< N/; i++) { twiddleCoef[2*i]= cos(i * 2*PI/(float)N); twiddleCoef[2*i+1]= sin(i * 2*PI/(float)N); } </pre> </dd></dl> <dl class="section user"><dt></dt><dd>where N = 64 and PI = 3.14159265358979 </dd></dl> <dl class="section user"><dt></dt><dd>Cos and Sin values are in interleaved fashion </dd></dl> <p>Referenced by <a class="el" href="group__RealFFT.html#gac5fceb172551e7c11eb4d0e17ef15aa3">arm_rfft_fast_init_f32()</a>.</p> </div> </div> <a class="anchor" id="gaa0cc411e0b3c82078e85cfdf1b84290f"></a> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <td class="memname">const <a class="el" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea">q15_t</a> twiddleCoef_64_q15[96]</td> </tr> </table> </div><div class="memdoc"> <dl class="section user"><dt></dt><dd>Example code for q15 Twiddle factors Generation:: </dd></dl> <dl class="section user"><dt></dt><dd><pre>for(i = 0; i< 3N/4; i++) { twiddleCoefq15[2*i]= cos(i * 2*PI/(float)N); twiddleCoefq15[2*i+1]= sin(i * 2*PI/(float)N); } </pre> </dd></dl> <dl class="section user"><dt></dt><dd>where N = 64 and PI = 3.14159265358979 </dd></dl> <dl class="section user"><dt></dt><dd>Cos and Sin values are interleaved fashion </dd></dl> <dl class="section user"><dt></dt><dd>Convert Floating point to q15(Fixed point 1.15): round(twiddleCoefq15(i) * pow(2, 15)) </dd></dl> </div> </div> <a class="anchor" id="ga6e0a7e941a25a0d74b2e6590307de47e"></a> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <td class="memname">const <a class="el" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> twiddleCoef_64_q31[96]</td> </tr> </table> </div><div class="memdoc"> <dl class="section user"><dt></dt><dd>Example code for Q31 Twiddle factors Generation:: </dd></dl> <dl class="section user"><dt></dt><dd><pre>for(i = 0; i< 3N/4; i++) { twiddleCoefQ31[2*i]= cos(i * 2*PI/(float)N); twiddleCoefQ31[2*i+1]= sin(i * 2*PI/(float)N); } </pre> </dd></dl> <dl class="section user"><dt></dt><dd>where N = 64 and PI = 3.14159265358979 </dd></dl> <dl class="section user"><dt></dt><dd>Cos and Sin values are interleaved fashion </dd></dl> <dl class="section user"><dt></dt><dd>Convert Floating point to Q31(Fixed point 1.31): round(twiddleCoefQ31(i) * pow(2, 31)) </dd></dl> </div> </div> </div><!-- contents --> </div><!-- doc-content --> <!-- start footer part --> <div id="nav-path" class="navpath"><!-- id is needed for treeview function! --> <ul> <li class="footer">Generated on Wed Feb 8 2017 10:20:51 for CMSIS-DSP by 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