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<h2>
<span class="refentrytitle">cvanal</span>
</h2>
<p>cvanal —
Converts a soundfile into a single Fourier transform frame.
<a id="IndexCvanal" class="indexterm"></a>
</p>
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<div class="refsect1" title="Description">
<a id="idp81206984"></a>
<h2>Description</h2>
<p>
Impulse Response Fourier Analysis for <a class="link" href="convolve.html" title="convolve"><em class="citetitle">convolve</em></a> operator
</p>
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<div class="refsect1" title="Syntax">
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<h2>Syntax</h2>
<pre class="synopsis"><span class="command"><strong>csound -U cvanal</strong></span> [flags] infilename outfilename</pre>
<pre class="synopsis"><span class="command"><strong>cvanal</strong></span> [flags] infilename outfilename</pre>
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<div class="refsect1" title="Initialization">
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<h2>Initialization</h2>
<p>
<span class="emphasis"><em>cvanal</em></span> -- converts a soundfile into a single Fourier transform frame. The output file can be used by the <span class="emphasis"><em>convolve</em></span> operator to perform Fast Convolution between an input signal and the original impulse response. Analysis is conditioned by the flags below. A space is optional between the flag and its argument.
</p>
<p>
<span class="emphasis"><em>-s rate</em></span> -- sampling rate of the audio input file. This will over-ride the srate of the soundfile header, which otherwise applies. If neither is present, the default is 10000.
</p>
<p>
<span class="emphasis"><em>-c channel</em></span> -- channel number sought. If omitted, the default is to process all channels. If a value is given, only the selected channel will be processed.
</p>
<p>
<span class="emphasis"><em>-b begin</em></span> -- beginning time (in seconds) of the audio segment to be analyzed. The default is 0.0
</p>
<p>
<span class="emphasis"><em>-d duration</em></span> -- duration (in seconds) of the audio segment to be analyzed. The default of 0.0 means to the end of the file.
</p>
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<div class="refsect1" title="Examples">
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<h2>Examples</h2>
<p>
</p>
<pre class="programlisting"><span class="emphasis"><em>cvanal</em></span> asound cvfile</pre>
<p>
will analyze the soundfile "asound" to produce the file "cvfile" for the use with <a class="link" href="convolve.html" title="convolve"><em class="citetitle">convolve</em></a>.
</p>
<p>
To use data that is not already contained in a soundfile, a soundfile converter that accepts text files may be used to create a standard audio file, e.g., the .DAT format for SOX. This is useful for implementing FIR filters.
</p>
<div class="refsect2" title="Files">
<a id="idp81268424"></a>
<h3>Files</h3>
<p>
The output file has a special <span class="emphasis"><em>convolve</em></span> header, containing details of the source audio file. The analysis data is stored as <span class="quote">“<span class="quote">float</span>”</span>, in rectangular (real/imaginary) form.
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<th align="left">Note</th>
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<p>
The analysis file is <span class="emphasis"><em>not</em></span> system independent! Ensure that the original impulse recording/data is retained. If/when required, the analysis file can be recreated.
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<div class="refsect1" title="Credits">
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<h2>Credits</h2>
<p>Author: Greg Sullivan</p>
<p>Based on algorithm given in <span class="emphasis"><em>Elements Of Computer Music</em></span>, by F. Richard Moore.</p>
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distrib
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Mageia
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5
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x86_64
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media
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core-release
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b707d9a4ee443103660a75ccb6e51334
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files
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