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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "https://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<div id="projectbrief">ISPU DSP library for IIS3DWB10IS device</div>
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<div class="headertitle"><div class="title">Transform </div></div>
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<tr class="heading"><td colspan="2"><h2 id="header-nested-classes" class="groupheader"><a id="nested-classes" name="nested-classes"></a>
Data Structures</h2></td></tr>
<tr class="memitem:ispu_5Frfft_5Finstance_5Ff32" id="r_ispu_5Frfft_5Finstance_5Ff32"><td class="memItemLeft" align="right" valign="top">struct  </td><td class="memItemRight" valign="bottom"><a class="el" href="structispu__rfft__instance__f32.html">ispu_rfft_instance_f32</a></td></tr>
<tr class="memdesc:"><td class="mdescLeft"> </td><td class="mdescRight">Floating-point RFFT (real fast Fourier transform) instance structure. <a href="structispu__rfft__instance__f32.html#details">More...</a><br /></td></tr>
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<tr class="heading"><td colspan="2"><h2 id="header-func-members" class="groupheader"><a id="func-members" name="func-members"></a>
Functions</h2></td></tr>
<tr class="memitem:ga1d9e6cc71b328df2b25d13a244cd8d9a" id="r_ga1d9e6cc71b328df2b25d13a244cd8d9a"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="#ga1d9e6cc71b328df2b25d13a244cd8d9a">ispu_rfft_init_f32</a> (struct <a class="el" href="structispu__rfft__instance__f32.html">ispu_rfft_instance_f32</a> *inst, uint16_t fft_len)</td></tr>
<tr class="memdesc:ga1d9e6cc71b328df2b25d13a244cd8d9a"><td class="mdescLeft"> </td><td class="mdescRight">Floating-point RFFT (real fast Fourier transform) initialization function. <br /></td></tr>
<tr class="memitem:gab22d8e8fc6cbb883cf85b4e9f86e6645" id="r_gab22d8e8fc6cbb883cf85b4e9f86e6645"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="#gab22d8e8fc6cbb883cf85b4e9f86e6645">ispu_rfft_f32</a> (struct <a class="el" href="structispu__rfft__instance__f32.html">ispu_rfft_instance_f32</a> *inst, float *data)</td></tr>
<tr class="memdesc:gab22d8e8fc6cbb883cf85b4e9f86e6645"><td class="mdescLeft"> </td><td class="mdescRight">Floating-point RFFT (real fast Fourier transform) processing function. <br /></td></tr>
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<a name="details" id="details"></a><h2 id="header-details" class="groupheader">Detailed Description</h2>
<p>This group provides tranforms. </p>
<a name="doc-func-members" id="doc-func-members"></a><h2 id="header-doc-func-members" class="groupheader">Function Documentation</h2>
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<h2 class="memtitle"><span class="permalink"><a href="#ga1d9e6cc71b328df2b25d13a244cd8d9a">◆ </a></span>ispu_rfft_init_f32()</h2>
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<td class="memname">int ispu_rfft_init_f32 </td>
<td>(</td>
<td class="paramtype">struct <a class="el" href="structispu__rfft__instance__f32.html">ispu_rfft_instance_f32</a> *</td> <td class="paramname"><span class="paramname"><em>inst</em></span>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">uint16_t</td> <td class="paramname"><span class="paramname"><em>fft_len</em></span> )</td>
</tr>
</table>
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<p>Floating-point RFFT (real fast Fourier transform) initialization function. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">inst</td><td>Pointer to the instance structure </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">fft_len</td><td>Length of the FFT </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>0 on success or -1 on failure </dd></dl>
</div>
</div>
<a id="gab22d8e8fc6cbb883cf85b4e9f86e6645" name="gab22d8e8fc6cbb883cf85b4e9f86e6645"></a>
<h2 class="memtitle"><span class="permalink"><a href="#gab22d8e8fc6cbb883cf85b4e9f86e6645">◆ </a></span>ispu_rfft_f32()</h2>
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<td class="memname">void ispu_rfft_f32 </td>
<td>(</td>
<td class="paramtype">struct <a class="el" href="structispu__rfft__instance__f32.html">ispu_rfft_instance_f32</a> *</td> <td class="paramname"><span class="paramname"><em>inst</em></span>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">float *</td> <td class="paramname"><span class="paramname"><em>data</em></span> )</td>
</tr>
</table>
</div><div class="memdoc">
<p>Floating-point RFFT (real fast Fourier transform) processing function. </p>
<p>The output is the first half of the spectrum represented as complex numbers. Each complex number is composed by two floating-point values, the first one representing the real part and the second one representing the imaginary part. The first complex number in the output contains the DC bin in the real part and the Nyquist bin in the imaginary part. </p><dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">inst</td><td>Pointer to the instance structure </td></tr>
<tr><td class="paramdir">[in,out]</td><td class="paramname">data</td><td>Pointer to the input/output data. It must be aligned as follows:<ul>
<li>fft_len = 32 requires alignment to 128 bytes</li>
<li>fft_len = 64 requires alignment to 256 bytes</li>
<li>fft_len = 128 requires alignment to 512 bytes</li>
<li>fft_len = 256 requires alignment to 1024 bytes</li>
<li>fft_len = 512 requires alignment to 2048 bytes</li>
<li>fft_len = 1024 requires alignment to 4096 bytes</li>
<li>fft_len = 2048 requires alignment to 8192 bytes </li>
</ul>
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