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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<title>Graphic Equalizer 2: C:/Project Marcel & Oliver/Graphic_Equalizer/src/fft.hcc File Reference</title>
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<a class="el" href="dir_000000.html">C:</a> / <a class="el" href="dir_000001.html">Project Marcel & Oliver</a> / <a class="el" href="dir_000002.html">Graphic_Equalizer</a> / <a class="el" href="dir_000004.html">src</a></div>
<h1>fft.hcc File Reference</h1><code>#include <stdlib.hch></code><br>
<code>#include "pal_master.hch"</code><br>
<code>#include "<a class="el" href="audio_8hch-source.html">audio.hch</a>"</code><br>
<code>#include "<a class="el" href="weights__256_8hch-source.html">weights_256.hch</a>"</code><br>
<code>#include "<a class="el" href="configuration_8hch-source.html">configuration.hch</a>"</code><br>
<code>#include "xilinxmult.hch"</code><br>
<code>#include "<a class="el" href="fft_8hch-source.html">fft.hch</a>"</code><br>
<p>
Include dependency graph for fft.hcc:<p><center><img src="fft_8hcc__incl.png" border="0" usemap="#fft.hcc_map" alt="Include dependency graph"></center>
<map name="fft.hcc_map">
<area href="audio_8hch.html" shape="rect" coords="245,7,325,34" alt="">
<area href="weights__256_8hch.html" shape="rect" coords="349,7,472,34" alt="">
<area href="configuration_8hch.html" shape="rect" coords="496,7,621,34" alt="">
<area href="fft_8hch.html" shape="rect" coords="773,7,832,34" alt="">
</map>
<p>
<a href="fft_8hcc-source.html">Go to the source code of this file.</a><table border="0" cellpadding="0" cellspacing="0">
<tr><td></td></tr>
<tr><td colspan="2"><br><h2>Defines</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="fft_8hcc.html#a0">DC_COMPONENT</a> 8470527</td></tr>
<tr><td colspan="2"><br><h2>Functions</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">macro proc </td><td class="memItemRight" valign="bottom"><a class="el" href="fft_8hcc.html#a2">multiply</a> (result, op_a, op_b)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Procedure used for multiply-ing. <a href="#a2"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="fft_8hcc.html#a3">calculate_fft</a> (unsigned 1 select_inverse)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">This routine performs the Fast Fourier Transform for calculation of the frequency spectrum. <a href="#a3"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="fft_8hcc.html#a4">perform_fft</a> (signed 16 *pcm_audio)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="fft_8hcc.html#a5">perform_ifft</a> (signed 16 *modified_audio, unsigned 6 *ifft_info)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="fft_8hcc.html#a6">equalize_audio</a> (<a class="el" href="structaudiodata__t.html">audiodata_t</a> *audiodata)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">This routine equalizes the frequencies derived by the FFT calculation, according to the settings of the equalizer bars. <a href="#a6"></a><br></td></tr>
<tr><td colspan="2"><br><h2>Variables</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">ram signed </td><td class="memItemRight" valign="bottom"><a class="el" href="fft_8hcc.html#a1">eq_settings</a> [16] = {0,2,4,7,10,13,16,19,22,26,30,35,41,48,55,63}</td></tr>
</table>
<hr><a name="_details"></a><h2>Detailed Description</h2>
<h2><a class="anchor" name="generic">
Graphic Equalizer API</a></h2>
on the samples. Besides the FFT this module also will equalize the audio signal according to the setting made by the user.<h2><a class="anchor" name="project">
Project information.</a></h2>
Project Graphic Equalizer<br>
<dl compact><dt><b>Author:</b></dt><dd>M. Lauwerijssen </dd></dl>
<dl compact><dt><b>Date:</b></dt><dd>20041110 </dd></dl>
<dl compact><dt><b>Version:</b></dt><dd>0.1</dd></dl>
<h2><a class="anchor" name="copyright">
Copyright</a></h2>
Copyright ©2004 Koninklijke Philips Electronics N.V. All rights reserved<h2><a class="anchor" name="history">
Change history</a></h2>
20041110: M. Lauwerijssen<br>
Initial version
<p>
Definition in file <a class="el" href="fft_8hcc-source.html">fft.hcc</a>.<hr><h2>Define Documentation</h2>
<a class="anchor" name="a0" doxytag="fft.hcc::DC_COMPONENT"></a><p>
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<td class="mdRow">
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<td class="md" nowrap valign="top">#define DC_COMPONENT 8470527 </td>
</tr>
</table>
</td>
</tr>
</table>
<table cellspacing="5" cellpadding="0" border="0">
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<td>
</td>
<td>
<p>
<p>
Definition at line <a class="el" href="fft_8hcc-source.html#l00069">69</a> of file <a class="el" href="fft_8hcc-source.html">fft.hcc</a>. </td>
</tr>
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<hr><h2>Function Documentation</h2>
<a class="anchor" name="a2" doxytag="fft.hcc::multiply"></a><p>
<table class="mdTable" width="100%" cellpadding="2" cellspacing="0">
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<td class="md" nowrap valign="top">macro proc multiply </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">result </td>
<td class="mdname" nowrap>, </td>
</tr>
<tr>
<td class="md" nowrap align="right"></td>
<td class="md"></td>
<td class="md" nowrap>op_a </td>
<td class="mdname" nowrap>, </td>
</tr>
<tr>
<td class="md" nowrap align="right"></td>
<td class="md"></td>
<td class="md" nowrap>op_b </td>
<td class="mdname" nowrap></td>
</tr>
<tr>
<td class="md"></td>
<td class="md">) </td>
<td class="md" colspan="2"></td>
</tr>
</table>
</td>
</tr>
</table>
<table cellspacing="5" cellpadding="0" border="0">
<tr>
<td>
</td>
<td>
<p>
Procedure used for multiply-ing.
<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>result</em> </td><td>variable containing the result of the multiply procedure </td></tr>
<tr><td valign="top"></td><td valign="top"><em>op_a</em> </td><td>integer value to be multiplied. </td></tr>
<tr><td valign="top"></td><td valign="top"><em>op_b</em> </td><td>integer value to be multiplied.</td></tr>
</table>
</dl>
<dl compact><dt><b>Returns:</b></dt><dd>Procedure returns through variable. </dd></dl>
<dl compact><dt><b>Return values:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>signed</em> </td><td>36 </td></tr>
</table>
</dl>
<p>
Definition at line <a class="el" href="fft_8hcc-source.html#l00082">82</a> of file <a class="el" href="fft_8hcc-source.html">fft.hcc</a>.
<p>
Referenced by <a class="el" href="fft_8hcc-source.html#l00104">calculate_fft()</a>, and <a class="el" href="fft_8hcc-source.html#l00398">equalize_audio()</a>. </td>
</tr>
</table>
<a class="anchor" name="a3" doxytag="fft.hcc::calculate_fft"></a><p>
<table class="mdTable" width="100%" cellpadding="2" cellspacing="0">
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<td class="mdRow">
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<td class="md" nowrap valign="top">void calculate_fft </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">unsigned 1 </td>
<td class="mdname1" valign="top" nowrap> <em>select_inverse</em> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap></td>
</tr>
</table>
</td>
</tr>
</table>
<table cellspacing="5" cellpadding="0" border="0">
<tr>
<td>
</td>
<td>
<p>
This routine performs the Fast Fourier Transform for calculation of the frequency spectrum.
<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>select_inverse</em> </td><td>determines if a FFT or iFFT has to be calculated</td></tr>
</table>
</dl>
<dl compact><dt><b>Returns:</b></dt><dd>nothing </dd></dl>
<dl compact><dt><b>Return values:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>void</em> </td><td>cost 12391 cycles </td></tr>
</table>
</dl>
<p>
Definition at line <a class="el" href="fft_8hcc-source.html#l00104">104</a> of file <a class="el" href="fft_8hcc-source.html">fft.hcc</a>.
<p>
References <a class="el" href="fft_8hcc-source.html#l00082">multiply()</a>, <a class="el" href="fft_8hch-source.html#l00001">NUMBER_OF_COLUMNS</a>, <a class="el" href="fft_8hch-source.html#l00002">NUMBER_OF_POINTS</a>, <a class="el" href="weights__256_8hch-source.html#l00135">weight_im</a>, and <a class="el" href="weights__256_8hch-source.html#l00004">weight_re</a>.
<p>
Referenced by <a class="el" href="fft_8hcc-source.html#l00259">perform_fft()</a>, and <a class="el" href="fft_8hcc-source.html#l00324">perform_ifft()</a>. </td>
</tr>
</table>
<p>
Here is the call graph for this function:<p><center><img src="fft_8hcc_a3_cgraph.png" border="0" usemap="#fft_8hcc_a3_cgraph_map" alt=""></center>
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<a class="anchor" name="a4" doxytag="fft.hcc::perform_fft"></a><p>
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<td class="md" nowrap valign="top">void perform_fft </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">signed 16 * </td>
<td class="mdname1" valign="top" nowrap> <em>pcm_audio</em> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap></td>
</tr>
</table>
</td>
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<table cellspacing="5" cellpadding="0" border="0">
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<td>
</td>
<td>
<p>
<p>
Definition at line <a class="el" href="fft_8hcc-source.html#l00259">259</a> of file <a class="el" href="fft_8hcc-source.html">fft.hcc</a>.
<p>
References <a class="el" href="fft_8hcc-source.html#l00104">calculate_fft()</a>. </td>
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</table>
<p>
Here is the call graph for this function:<p><center><img src="fft_8hcc_a4_cgraph.png" border="0" usemap="#fft_8hcc_a4_cgraph_map" alt=""></center>
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<a class="anchor" name="a5" doxytag="fft.hcc::perform_ifft"></a><p>
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<td class="md" nowrap valign="top">void perform_ifft </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">signed 16 * </td>
<td class="mdname" nowrap> <em>modified_audio</em>, </td>
</tr>
<tr>
<td class="md" nowrap align="right"></td>
<td class="md"></td>
<td class="md" nowrap>unsigned 6 * </td>
<td class="mdname" nowrap> <em>ifft_info</em></td>
</tr>
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<td class="md"></td>
<td class="md">) </td>
<td class="md" colspan="2"></td>
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<p>
Definition at line <a class="el" href="fft_8hcc-source.html#l00324">324</a> of file <a class="el" href="fft_8hcc-source.html">fft.hcc</a>.
<p>
References <a class="el" href="fft_8hcc-source.html#l00104">calculate_fft()</a>. </td>
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Here is the call graph for this function:<p><center><img src="fft_8hcc_a5_cgraph.png" border="0" usemap="#fft_8hcc_a5_cgraph_map" alt=""></center>
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<a class="anchor" name="a6" doxytag="fft.hcc::equalize_audio"></a><p>
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<td class="md" nowrap valign="top">void equalize_audio </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top"><a class="el" href="structaudiodata__t.html">audiodata_t</a> * </td>
<td class="mdname1" valign="top" nowrap> <em>audiodata</em> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap></td>
</tr>
</table>
</td>
</tr>
</table>
<table cellspacing="5" cellpadding="0" border="0">
<tr>
<td>
</td>
<td>
<p>
This routine equalizes the frequencies derived by the FFT calculation, according to the settings of the equalizer bars.
<p>
<dl compact><dt><b>Note:</b></dt><dd>Cost: 3844 clock cycles (Maximum)</dd></dl>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>*audiodata</em> </td><td>pointer to the audiodata struct, containing the eq_info, etc.</td></tr>
</table>
</dl>
<dl compact><dt><b>Returns:</b></dt><dd>void </dd></dl>
<dl compact><dt><b>Return values:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>void</em> </td><td></td></tr>
</table>
</dl>
<p>
Definition at line <a class="el" href="fft_8hcc-source.html#l00398">398</a> of file <a class="el" href="fft_8hcc-source.html">fft.hcc</a>.
<p>
References <a class="el" href="audio_8hch-source.html#l00035">audiodata_t::display_log</a>, <a class="el" href="fft_8hcc-source.html#l00064">eq_settings</a>, <a class="el" href="audio_8hch-source.html#l00034">audiodata_t::equalizer_levels_ptr</a>, <a class="el" href="fft_8hcc-source.html#l00082">multiply()</a>, and <a class="el" href="fft_8hch-source.html#l00002">NUMBER_OF_POINTS</a>. </td>
</tr>
</table>
<p>
Here is the call graph for this function:<p><center><img src="fft_8hcc_a6_cgraph.png" border="0" usemap="#fft_8hcc_a6_cgraph_map" alt=""></center>
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<hr><h2>Variable Documentation</h2>
<a class="anchor" name="a1" doxytag="fft.hcc::eq_settings"></a><p>
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<td class="md" nowrap valign="top">ram signed <a class="el" href="fft_8hcc.html#a1">eq_settings</a>[16] = {0,2,4,7,10,13,16,19,22,26,30,35,41,48,55,63} </td>
</tr>
</table>
</td>
</tr>
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<td>
</td>
<td>
<p>
<p>
Definition at line <a class="el" href="fft_8hcc-source.html#l00064">64</a> of file <a class="el" href="fft_8hcc-source.html">fft.hcc</a>.
<p>
Referenced by <a class="el" href="fft_8hcc-source.html#l00398">equalize_audio()</a>. </td>
</tr>
</table>
<hr size="1"><address style="align: right;"><small>Generated on Thu Dec 9 14:37:09 2004 for Graphic Equalizer 2 by
<a href="http://www.doxygen.org/index.html">
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