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<h2>
<span class="refentrytitle">GEN43</span>
</h2>
<p>GEN43 —
Loads a PVOCEX file containing a PV analysis.
</p>
</div>
<div class="refsect1" title="Description">
<a id="idp78410096"></a>
<h2>Description</h2>
<p>
This subroutine loads a PVOCEX file containing the PV analysis (amp-freq)
of a soundfile and calculates the average magnitudes of all analysis frames
of one or all audio channels. It then creates a table with these magnitudes
for each PV bin.
</p>
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<div class="refsect1" title="Syntax">
<a id="idp78410944"></a>
<h2>Syntax</h2>
<pre class="synopsis"><span class="command"><strong>f</strong></span> # time size 43 filecod channel</pre>
</div>
<div class="refsect1" title="Initialisation">
<a id="idp78440328"></a>
<h2>Initialisation</h2>
<p>
<span class="emphasis"><em>size</em></span> -- number of points in the table,
power-of-two or power-of-two plus 1.
GEN 43 does not make any distinction between these two sizes, but it
requires the table to be at least the fftsize/2. PV bins cover the
positive spectrum from 0Hz (table index 0) to the Nyquist (table index
fftsize/2+1) in equal-size frequency increments (of size sr/fftsize).
</p>
<p>
<span class="emphasis"><em>filcod</em></span> -- a pvocex file (which can be generated
by pvanal).
</p>
<p>
<span class="emphasis"><em>channel</em></span> -- audio channel number from which
the magnitudes will be extracted; a 0 will average the
magnitudes from all channels.
</p>
<p>
Reading stops at the end of the file.
</p>
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<th align="left">Note</th>
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<p>if p4 is positive, the table will be post-normalised. A
negative p4 will cause post-normalisation to be skipped.
</p>
</td>
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<div class="refsect1" title="Examples">
<a id="idp78443520"></a>
<h2>Examples</h2>
<p>
</p>
<pre class="programlisting"><span class="stamnt">f</span>1 0 512 43 "viola.pvx" 1
<span class="stamnt">f</span>1 0 -1024 -43 "noiseprint.pvx" 0</pre>
<p>
</p>
<p>
This table can be used as a masking table for pvstencil and pvsmaska. The
first example uses a 1024-point FFT phase vocoder analysis file from which
the first channel is used. The second uses all channels of a 2048-point
file, without post-normalisation. For noise reduction applications with
pvstencil, it is easiest to skip table normalisation (negative GEN code).
</p>
</div>
<div class="refsect1" title="Credits">
<a id="idp78445696"></a>
<h2>Credits</h2>
<p>Author: Victor Lazzarini</p>
</div>
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distrib
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Mageia
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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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