764 lines
39 KiB
HTML
764 lines
39 KiB
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<div class="title">DCT Type IV Tables<div class="ingroups"><a class="el" href="group__DCT4__IDCT4.html">DCT Type IV Functions</a></div></div> </div>
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Variables</h2></td></tr>
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<tr class="memitem:gad00f29d896d64d6da7afbbb9d3e182a4"><td class="memItemLeft" align="right" valign="top">static const <a class="el" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715">float32_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__DCT4__IDCT4__Table.html#gad00f29d896d64d6da7afbbb9d3e182a4">Weights_128</a> [256]</td></tr>
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<tr class="separator:gad00f29d896d64d6da7afbbb9d3e182a4"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:gaeb67b0be5b3c2139d660e02cedeed908"><td class="memItemLeft" align="right" valign="top">static const <a class="el" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715">float32_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__DCT4__IDCT4__Table.html#gaeb67b0be5b3c2139d660e02cedeed908">Weights_512</a> [1024]</td></tr>
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<tr class="separator:gaeb67b0be5b3c2139d660e02cedeed908"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:gac3a2a00b3106dfcb5e0a582f50c65692"><td class="memItemLeft" align="right" valign="top">static const <a class="el" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715">float32_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__DCT4__IDCT4__Table.html#gac3a2a00b3106dfcb5e0a582f50c65692">Weights_2048</a> [4096]</td></tr>
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<tr class="separator:gac3a2a00b3106dfcb5e0a582f50c65692"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:ga45a8ec91e5da91790566105bc7e6f0c2"><td class="memItemLeft" align="right" valign="top">static const <a class="el" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715">float32_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__DCT4__IDCT4__Table.html#ga45a8ec91e5da91790566105bc7e6f0c2">Weights_8192</a> [16384]</td></tr>
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<tr class="separator:ga45a8ec91e5da91790566105bc7e6f0c2"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:ga16248ed86161ef97538011b49f13e8b7"><td class="memItemLeft" align="right" valign="top">static const <a class="el" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715">float32_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__DCT4__IDCT4__Table.html#ga16248ed86161ef97538011b49f13e8b7">cos_factors_128</a> [128]</td></tr>
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<tr class="separator:ga16248ed86161ef97538011b49f13e8b7"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:ga49fd288352ca5bb43f5cec52273b0d80"><td class="memItemLeft" align="right" valign="top">static const <a class="el" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715">float32_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__DCT4__IDCT4__Table.html#ga49fd288352ca5bb43f5cec52273b0d80">cos_factors_512</a> [512]</td></tr>
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<tr class="separator:ga49fd288352ca5bb43f5cec52273b0d80"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:ga1ba5306e0bc44730b40ab34cced45fd6"><td class="memItemLeft" align="right" valign="top">static const <a class="el" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715">float32_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__DCT4__IDCT4__Table.html#ga1ba5306e0bc44730b40ab34cced45fd6">cos_factors_2048</a> [2048]</td></tr>
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<tr class="separator:ga1ba5306e0bc44730b40ab34cced45fd6"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:gac12484542bc6aaecc754c855457411de"><td class="memItemLeft" align="right" valign="top">static const <a class="el" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715">float32_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__DCT4__IDCT4__Table.html#gac12484542bc6aaecc754c855457411de">cos_factors_8192</a> [8192]</td></tr>
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<tr class="separator:gac12484542bc6aaecc754c855457411de"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:gaa4ff5e6f062efb1d1ec8c6c2207c3727"><td class="memItemLeft" align="right" valign="top">static const <a class="el" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea">q15_t</a> <a class="el" href="arm__math_8h.html#a280a402ab28c399fcc4168f2ed631acb">ALIGN4</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__DCT4__IDCT4__Table.html#gaa4ff5e6f062efb1d1ec8c6c2207c3727">WeightsQ15_128</a> [256]</td></tr>
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<tr class="separator:gaa4ff5e6f062efb1d1ec8c6c2207c3727"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:gadc8ee250fc217d6cb5c84dd7c1eb6d31"><td class="memItemLeft" align="right" valign="top">static const <a class="el" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea">q15_t</a> <a class="el" href="arm__math_8h.html#a280a402ab28c399fcc4168f2ed631acb">ALIGN4</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__DCT4__IDCT4__Table.html#gadc8ee250fc217d6cb5c84dd7c1eb6d31">WeightsQ15_512</a> [1024]</td></tr>
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<tr class="separator:gadc8ee250fc217d6cb5c84dd7c1eb6d31"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:ga2235ec700d0d6925d9733f48541d46f5"><td class="memItemLeft" align="right" valign="top">static const <a class="el" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea">q15_t</a> <a class="el" href="arm__math_8h.html#a280a402ab28c399fcc4168f2ed631acb">ALIGN4</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__DCT4__IDCT4__Table.html#ga2235ec700d0d6925d9733f48541d46f5">WeightsQ15_2048</a> [4096]</td></tr>
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<tr class="separator:ga2235ec700d0d6925d9733f48541d46f5"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:ga4fdc60621eb306984a82ce8b2d645bb7"><td class="memItemLeft" align="right" valign="top">static const <a class="el" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea">q15_t</a> <a class="el" href="arm__math_8h.html#a280a402ab28c399fcc4168f2ed631acb">ALIGN4</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__DCT4__IDCT4__Table.html#ga4fdc60621eb306984a82ce8b2d645bb7">WeightsQ15_8192</a> [16384]</td></tr>
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<tr class="separator:ga4fdc60621eb306984a82ce8b2d645bb7"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:ga1477edd21c7b08b0b59a564f6c24d6c5"><td class="memItemLeft" align="right" valign="top">static const <a class="el" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea">q15_t</a> <a class="el" href="arm__math_8h.html#a280a402ab28c399fcc4168f2ed631acb">ALIGN4</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__DCT4__IDCT4__Table.html#ga1477edd21c7b08b0b59a564f6c24d6c5">cos_factorsQ15_128</a> [128]</td></tr>
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<tr class="separator:ga1477edd21c7b08b0b59a564f6c24d6c5"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:gac056c3d026058eab3ba650828ff5642f"><td class="memItemLeft" align="right" valign="top">static const <a class="el" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea">q15_t</a> <a class="el" href="arm__math_8h.html#a280a402ab28c399fcc4168f2ed631acb">ALIGN4</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__DCT4__IDCT4__Table.html#gac056c3d026058eab3ba650828ff5642f">cos_factorsQ15_512</a> [512]</td></tr>
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<tr class="separator:gac056c3d026058eab3ba650828ff5642f"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:gaeee5df7c1be2374441868ecbbc6c7e5d"><td class="memItemLeft" align="right" valign="top">static const <a class="el" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea">q15_t</a> <a class="el" href="arm__math_8h.html#a280a402ab28c399fcc4168f2ed631acb">ALIGN4</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__DCT4__IDCT4__Table.html#gaeee5df7c1be2374441868ecbbc6c7e5d">cos_factorsQ15_2048</a> [2048]</td></tr>
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<tr class="separator:gaeee5df7c1be2374441868ecbbc6c7e5d"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:ga988ff0563cc9df7848c9348871ac6c07"><td class="memItemLeft" align="right" valign="top">static const <a class="el" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea">q15_t</a> <a class="el" href="arm__math_8h.html#a280a402ab28c399fcc4168f2ed631acb">ALIGN4</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__DCT4__IDCT4__Table.html#ga988ff0563cc9df7848c9348871ac6c07">cos_factorsQ15_8192</a> [8192]</td></tr>
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<tr class="separator:ga988ff0563cc9df7848c9348871ac6c07"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:ga02d7024538a87214296b01d83ba36b02"><td class="memItemLeft" align="right" valign="top">static const <a class="el" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__DCT4__IDCT4__Table.html#ga02d7024538a87214296b01d83ba36b02">WeightsQ31_128</a> [256]</td></tr>
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<tr class="separator:ga02d7024538a87214296b01d83ba36b02"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:ga31a8217a96f7d3171921e98398f31596"><td class="memItemLeft" align="right" valign="top">static const <a class="el" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__DCT4__IDCT4__Table.html#ga31a8217a96f7d3171921e98398f31596">WeightsQ31_512</a> [1024]</td></tr>
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<tr class="separator:ga31a8217a96f7d3171921e98398f31596"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:ga725b65c25a02b3cad329e18bb832f65e"><td class="memItemLeft" align="right" valign="top">static const <a class="el" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__DCT4__IDCT4__Table.html#ga725b65c25a02b3cad329e18bb832f65e">WeightsQ31_2048</a> [4096]</td></tr>
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<tr class="separator:ga725b65c25a02b3cad329e18bb832f65e"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:ga16bf6bbe5c4c9b35f88253cf7bdcc435"><td class="memItemLeft" align="right" valign="top">static const <a class="el" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__DCT4__IDCT4__Table.html#ga16bf6bbe5c4c9b35f88253cf7bdcc435">WeightsQ31_8192</a> [16384]</td></tr>
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<tr class="separator:ga16bf6bbe5c4c9b35f88253cf7bdcc435"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:gabb8ee2004a3520fd08388db637d43875"><td class="memItemLeft" align="right" valign="top">static const <a class="el" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__DCT4__IDCT4__Table.html#gabb8ee2004a3520fd08388db637d43875">cos_factorsQ31_128</a> [128]</td></tr>
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<tr class="separator:gabb8ee2004a3520fd08388db637d43875"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:ga3559569e603cb918911074be88523d0e"><td class="memItemLeft" align="right" valign="top">static const <a class="el" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__DCT4__IDCT4__Table.html#ga3559569e603cb918911074be88523d0e">cos_factorsQ31_512</a> [512]</td></tr>
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<tr class="separator:ga3559569e603cb918911074be88523d0e"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:gaa15fc3fb058482defda371113cd12e74"><td class="memItemLeft" align="right" valign="top">static const <a class="el" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__DCT4__IDCT4__Table.html#gaa15fc3fb058482defda371113cd12e74">cos_factorsQ31_2048</a> [2048]</td></tr>
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<tr class="separator:gaa15fc3fb058482defda371113cd12e74"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:gaf687c4bbdbc700a3ad5d807d28de63e4"><td class="memItemLeft" align="right" valign="top">static const <a class="el" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__DCT4__IDCT4__Table.html#gaf687c4bbdbc700a3ad5d807d28de63e4">cos_factorsQ31_8192</a> [8192]</td></tr>
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</table>
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<a name="details" id="details"></a><h2 class="groupheader">Description</h2>
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<h2 class="groupheader">Variable Documentation</h2>
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<td class="memname">const <a class="el" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715">float32_t</a> cos_factors_128[128]</td>
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<dl class="section user"><dt></dt><dd>cosFactor tables are generated using the formula : <pre>cos_factors[n] = 2 * cos((2n+1)*pi/(4*N))</pre> </dd></dl>
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<dl class="section user"><dt></dt><dd>C command to generate the table </dd></dl>
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<dl class="section user"><dt></dt><dd><pre> for(i = 0; i< N; i++)
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{
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cos_factors[i]= 2 * cos((2*i+1)*c/2);
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} </pre> </dd></dl>
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<dl class="section user"><dt></dt><dd>where <code>N</code> is the number of factors to generate and <code>c</code> is <code>pi/(2*N)</code> </dd></dl>
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<p>Referenced by <a class="el" href="group__DCT4__IDCT4.html#gab094ad3bc6fa1b84e8b12a24e1850a06">arm_dct4_init_f32()</a>.</p>
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<td class="memname">const <a class="el" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715">float32_t</a> cos_factors_2048[2048]</td>
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<p>Referenced by <a class="el" href="group__DCT4__IDCT4.html#gab094ad3bc6fa1b84e8b12a24e1850a06">arm_dct4_init_f32()</a>.</p>
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<td class="memname">const <a class="el" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715">float32_t</a> cos_factors_512[512]</td>
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<p>Referenced by <a class="el" href="group__DCT4__IDCT4.html#gab094ad3bc6fa1b84e8b12a24e1850a06">arm_dct4_init_f32()</a>.</p>
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<td class="memname">const <a class="el" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715">float32_t</a> cos_factors_8192[8192]</td>
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<p>Referenced by <a class="el" href="group__DCT4__IDCT4.html#gab094ad3bc6fa1b84e8b12a24e1850a06">arm_dct4_init_f32()</a>.</p>
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<td class="memname">const <a class="el" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea">q15_t</a> <a class="el" href="arm__math_8h.html#a280a402ab28c399fcc4168f2ed631acb">ALIGN4</a> cos_factorsQ15_128[128]</td>
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<dl class="section user"><dt></dt><dd>cosFactor tables are generated using the formula : <pre> cos_factors[n] = 2 * cos((2n+1)*pi/(4*N)) </pre> </dd></dl>
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<dl class="section user"><dt></dt><dd>C command to generate the table <pre>
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for(i = 0; i< N; i++)
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{
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cos_factors[i]= 2 * cos((2*i+1)*c/2);
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} </pre> </dd></dl>
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<dl class="section user"><dt></dt><dd>where <code>N</code> is the number of factors to generate and <code>c</code> is <code>pi/(2*N)</code> </dd></dl>
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<dl class="section user"><dt></dt><dd>Then converted to q15 format by multiplying with 2^31 and saturated if required. </dd></dl>
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<p>Referenced by <a class="el" href="group__DCT4__IDCT4.html#ga966fd1b66a80873964533703ab5dc054">arm_dct4_init_q15()</a>.</p>
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<td class="memname">const <a class="el" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea">q15_t</a> <a class="el" href="arm__math_8h.html#a280a402ab28c399fcc4168f2ed631acb">ALIGN4</a> cos_factorsQ15_2048[2048]</td>
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<p>Referenced by <a class="el" href="group__DCT4__IDCT4.html#ga966fd1b66a80873964533703ab5dc054">arm_dct4_init_q15()</a>.</p>
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<td class="memname">const <a class="el" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea">q15_t</a> <a class="el" href="arm__math_8h.html#a280a402ab28c399fcc4168f2ed631acb">ALIGN4</a> cos_factorsQ15_512[512]</td>
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<p>Referenced by <a class="el" href="group__DCT4__IDCT4.html#ga966fd1b66a80873964533703ab5dc054">arm_dct4_init_q15()</a>.</p>
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<td class="memname">const <a class="el" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea">q15_t</a> <a class="el" href="arm__math_8h.html#a280a402ab28c399fcc4168f2ed631acb">ALIGN4</a> cos_factorsQ15_8192[8192]</td>
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<p>Referenced by <a class="el" href="group__DCT4__IDCT4.html#ga966fd1b66a80873964533703ab5dc054">arm_dct4_init_q15()</a>.</p>
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<td class="memname">const <a class="el" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> cos_factorsQ31_128[128]</td>
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<dl class="section user"><dt></dt><dd>cosFactor tables are generated using the formula : <pre>cos_factors[n] = 2 * cos((2n+1)*pi/(4*N))</pre> </dd></dl>
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<dl class="section user"><dt></dt><dd>C command to generate the table <pre>
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for(i = 0; i< N; i++)
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{
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cos_factors[i]= 2 * cos((2*i+1)*c/2);
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} </pre> </dd></dl>
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<dl class="section user"><dt></dt><dd>where <code>N</code> is the number of factors to generate and <code>c</code> is <code>pi/(2*N)</code> </dd></dl>
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<dl class="section user"><dt></dt><dd>Then converted to q31 format by multiplying with 2^31 and saturated if required. </dd></dl>
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<p>Referenced by <a class="el" href="group__DCT4__IDCT4.html#ga631bb59c7c97c814ff7147ecba6a716a">arm_dct4_init_q31()</a>.</p>
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<td class="memname">const <a class="el" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> cos_factorsQ31_2048[2048]</td>
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<p>Referenced by <a class="el" href="group__DCT4__IDCT4.html#ga631bb59c7c97c814ff7147ecba6a716a">arm_dct4_init_q31()</a>.</p>
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<td class="memname">const <a class="el" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> cos_factorsQ31_512[512]</td>
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<p>Referenced by <a class="el" href="group__DCT4__IDCT4.html#ga631bb59c7c97c814ff7147ecba6a716a">arm_dct4_init_q31()</a>.</p>
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<td class="memname">const <a class="el" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> cos_factorsQ31_8192[8192]</td>
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<p>Referenced by <a class="el" href="group__DCT4__IDCT4.html#ga631bb59c7c97c814ff7147ecba6a716a">arm_dct4_init_q31()</a>.</p>
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<td class="memname">const <a class="el" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715">float32_t</a> Weights_128[256]</td>
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<dl class="section user"><dt></dt><dd>Weights tables are generated using the formula : <pre>weights[n] = e^(-j*n*pi/(2*N))</pre> </dd></dl>
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<dl class="section user"><dt></dt><dd>C command to generate the table <pre>
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for(i = 0; i< N; i++)
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weights[2*i]= cos(i*c);
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weights[(2*i)+1]= -sin(i * c);
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} </pre> </dd></dl>
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<dl class="section user"><dt></dt><dd>Where <code>N</code> is the Number of weights to be calculated and <code>c</code> is <code>pi/(2*N)</code> </dd></dl>
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<dl class="section user"><dt></dt><dd>In the tables below the real and imaginary values are placed alternatively, hence the array length is <code>2*N</code>. </dd></dl>
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<p>Referenced by <a class="el" href="group__DCT4__IDCT4.html#gab094ad3bc6fa1b84e8b12a24e1850a06">arm_dct4_init_f32()</a>.</p>
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<td class="memname">const <a class="el" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715">float32_t</a> Weights_2048[4096]</td>
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<p>Referenced by <a class="el" href="group__DCT4__IDCT4.html#gab094ad3bc6fa1b84e8b12a24e1850a06">arm_dct4_init_f32()</a>.</p>
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<td class="memname">const <a class="el" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715">float32_t</a> Weights_512[1024]</td>
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<p>Referenced by <a class="el" href="group__DCT4__IDCT4.html#gab094ad3bc6fa1b84e8b12a24e1850a06">arm_dct4_init_f32()</a>.</p>
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<td class="memname">const <a class="el" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715">float32_t</a> Weights_8192[16384]</td>
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<p>Referenced by <a class="el" href="group__DCT4__IDCT4.html#gab094ad3bc6fa1b84e8b12a24e1850a06">arm_dct4_init_f32()</a>.</p>
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<a class="anchor" id="gaa4ff5e6f062efb1d1ec8c6c2207c3727"></a>
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<td class="memname">const <a class="el" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea">q15_t</a> <a class="el" href="arm__math_8h.html#a280a402ab28c399fcc4168f2ed631acb">ALIGN4</a> WeightsQ15_128[256]</td>
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<dl class="section user"><dt></dt><dd>Weights tables are generated using the formula : <pre>weights[n] = e^(-j*n*pi/(2*N))</pre> </dd></dl>
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<dl class="section user"><dt></dt><dd>C command to generate the table <pre>
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for(i = 0; i< N; i++)
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{
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weights[2*i]= cos(i*c);
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weights[(2*i)+1]= -sin(i * c);
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} </pre> </dd></dl>
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<dl class="section user"><dt></dt><dd>where <code>N</code> is the Number of weights to be calculated and <code>c</code> is <code>pi/(2*N)</code> </dd></dl>
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<dl class="section user"><dt></dt><dd>Converted the output to q15 format by multiplying with 2^31 and saturated if required. </dd></dl>
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<dl class="section user"><dt></dt><dd>In the tables below the real and imaginary values are placed alternatively, hence the array length is <code>2*N</code>. </dd></dl>
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<p>Referenced by <a class="el" href="group__DCT4__IDCT4.html#ga966fd1b66a80873964533703ab5dc054">arm_dct4_init_q15()</a>.</p>
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<a class="anchor" id="ga2235ec700d0d6925d9733f48541d46f5"></a>
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<td class="memname">const <a class="el" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea">q15_t</a> <a class="el" href="arm__math_8h.html#a280a402ab28c399fcc4168f2ed631acb">ALIGN4</a> WeightsQ15_2048[4096]</td>
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<span class="mlabels"><span class="mlabel">static</span></span> </td>
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<p>Referenced by <a class="el" href="group__DCT4__IDCT4.html#ga966fd1b66a80873964533703ab5dc054">arm_dct4_init_q15()</a>.</p>
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</div>
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<a class="anchor" id="gadc8ee250fc217d6cb5c84dd7c1eb6d31"></a>
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<div class="memitem">
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<td class="memname">const <a class="el" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea">q15_t</a> <a class="el" href="arm__math_8h.html#a280a402ab28c399fcc4168f2ed631acb">ALIGN4</a> WeightsQ15_512[1024]</td>
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</table>
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<span class="mlabels"><span class="mlabel">static</span></span> </td>
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</table>
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</div><div class="memdoc">
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<p>Referenced by <a class="el" href="group__DCT4__IDCT4.html#ga966fd1b66a80873964533703ab5dc054">arm_dct4_init_q15()</a>.</p>
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</div>
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</div>
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<a class="anchor" id="ga4fdc60621eb306984a82ce8b2d645bb7"></a>
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<div class="memitem">
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<td class="memname">const <a class="el" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea">q15_t</a> <a class="el" href="arm__math_8h.html#a280a402ab28c399fcc4168f2ed631acb">ALIGN4</a> WeightsQ15_8192[16384]</td>
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</tr>
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</table>
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</td>
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<span class="mlabels"><span class="mlabel">static</span></span> </td>
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</div><div class="memdoc">
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<p>Referenced by <a class="el" href="group__DCT4__IDCT4.html#ga966fd1b66a80873964533703ab5dc054">arm_dct4_init_q15()</a>.</p>
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</div>
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<a class="anchor" id="ga02d7024538a87214296b01d83ba36b02"></a>
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<div class="memitem">
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<td class="memname">const <a class="el" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> WeightsQ31_128[256]</td>
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</table>
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</td>
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<td class="mlabels-right">
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<span class="mlabels"><span class="mlabel">static</span></span> </td>
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</div><div class="memdoc">
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<dl class="section user"><dt></dt><dd>Weights tables are generated using the formula : <pre>weights[n] = e^(-j*n*pi/(2*N))</pre> </dd></dl>
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<dl class="section user"><dt></dt><dd>C command to generate the table <pre>
|
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for(i = 0; i< N; i++)
|
|
{
|
|
weights[2*i]= cos(i*c);
|
|
weights[(2*i)+1]= -sin(i * c);
|
|
} </pre> </dd></dl>
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<dl class="section user"><dt></dt><dd>where <code>N</code> is the Number of weights to be calculated and <code>c</code> is <code>pi/(2*N)</code> </dd></dl>
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<dl class="section user"><dt></dt><dd>Convert the output to q31 format by multiplying with 2^31 and saturated if required. </dd></dl>
|
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<dl class="section user"><dt></dt><dd>In the tables below the real and imaginary values are placed alternatively, hence the array length is <code>2*N</code>. </dd></dl>
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<p>Referenced by <a class="el" href="group__DCT4__IDCT4.html#ga631bb59c7c97c814ff7147ecba6a716a">arm_dct4_init_q31()</a>.</p>
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<a class="anchor" id="ga725b65c25a02b3cad329e18bb832f65e"></a>
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<td class="memname">const <a class="el" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> WeightsQ31_2048[4096]</td>
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</tr>
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<span class="mlabels"><span class="mlabel">static</span></span> </td>
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<p>Referenced by <a class="el" href="group__DCT4__IDCT4.html#ga631bb59c7c97c814ff7147ecba6a716a">arm_dct4_init_q31()</a>.</p>
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<a class="anchor" id="ga31a8217a96f7d3171921e98398f31596"></a>
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<td class="memname">const <a class="el" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> WeightsQ31_512[1024]</td>
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</table>
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<span class="mlabels"><span class="mlabel">static</span></span> </td>
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<p>Referenced by <a class="el" href="group__DCT4__IDCT4.html#ga631bb59c7c97c814ff7147ecba6a716a">arm_dct4_init_q31()</a>.</p>
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<a class="anchor" id="ga16bf6bbe5c4c9b35f88253cf7bdcc435"></a>
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<td class="memname">const <a class="el" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> WeightsQ31_8192[16384]</td>
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</tr>
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<span class="mlabels"><span class="mlabel">static</span></span> </td>
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<p>Referenced by <a class="el" href="group__DCT4__IDCT4.html#ga631bb59c7c97c814ff7147ecba6a716a">arm_dct4_init_q31()</a>.</p>
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