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<h2>
<span class="refentrytitle">pvslock</span>
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<p>pvslock —
Frequency lock an input fsig
</p>
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<div class="refsect1" title="Description">
<a id="idp39032696"></a>
<h2>Description</h2>
<p>
This opcode searches for spectral peaks and then locks the frequencies around those peaks. This is similar to
phase-locking in non-streaming PV processing. It can be used to improve timestretching and pitch-shifting quality in
PV processing.
</p>
</div>
<div class="refsect1" title="Syntax">
<a id="idp39033560"></a>
<h2>Syntax</h2>
<pre class="synopsis">fsig <span class="command"><strong>pvslock</strong></span> fsigin, klock</pre>
</div>
<div class="refsect1" title="Performance">
<a id="idp39061344"></a>
<h2>Performance</h2>
<p>
<span class="emphasis"><em>fsig</em></span> -- output pv stream
</p>
<p>
<span class="emphasis"><em>fsigin</em></span> -- input pv stream.
</p>
<p>
<span class="emphasis"><em>klock</em></span> -- frequency lock, 1 -> lock, 0 -> unlock (bypass).
</p>
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<th align="left">Warning</th>
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<td align="left" valign="top">
<p>
It is unsafe to use the same f-variable for both input and output of pvs opcodes. Using the same one might lead to undefined behavior on some opcodes. Use a different one on the left and right sides of the opcode.
</p>
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<div class="refsect1" title="Examples">
<a id="idp39063696"></a>
<h2>Examples</h2>
<p>
Here is an example of the pvslock opcode. It uses the file <a class="ulink" href="examples/pvslock.csd" target="_top"><em class="citetitle">pvslock.csd</em></a>.
</p>
<div class="example">
<a id="idp39064672"></a>
<p class="title">
<strong>Example 667. Example of the pvslock opcode.</strong>
</p>
<div class="example-contents">
<p>See the sections <a class="link" href="UsingRealTime.html" title="Real-Time Audio"><em class="citetitle">Real-time Audio</em></a> and <a class="link" href="CommandFlags.html" title="Csound command line"><em class="citetitle">Command Line Flags</em></a> for more information on using command line flags.</p>
<pre class="programlisting">
<span class="csdtag"><CsoundSynthesizer></span>
<span class="csdtag"><CsOptions></span>
<span class="comment">; Select audio/midi flags here according to platform</span>
-odac <span class="comment">;;;realtime audio out</span>
<span class="comment">;-iadc ;;;uncomment -iadc if realtime audio input is needed too</span>
<span class="comment">; For Non-realtime ouput leave only the line below:</span>
<span class="comment">; -o pvslock.wav -W ;;; for file output any platform</span>
<span class="csdtag"></CsOptions></span>
<span class="csdtag"><CsInstruments></span>
<span class="ohdr">sr</span> <span class="op">=</span> 44100
<span class="ohdr">ksmps</span> <span class="op">=</span> 32
<span class="ohdr">nchnls</span> <span class="op">=</span> 2
<span class="ohdr">0dbfs</span> <span class="op">=</span> 1
gifil <span class="ohdr">ftgen</span> 0, 0, 0, 1, "fox.wav", 0, 0, 1
<span class="oblock">instr</span> 1
klock <span class="op">=</span> p4
fsig <span class="opc">pvstanal</span> 1, 1, 1, gifil <span class="comment">; no further transformations </span>
fsigout <span class="opc">pvslock</span> fsig, klock <span class="comment">; lock frequency </span>
aout <span class="opc">pvsynth</span> fsigout
<span class="opc">outs</span> aout, aout
<span class="oblock">endin</span>
<span class="csdtag"></CsInstruments></span>
<span class="csdtag"><CsScore></span>
<span class="stamnt">i</span> 1 0 2.6 1 <span class="comment">; locked</span>
<span class="stamnt">i</span> 1 3 2.6 0 <span class="comment">; not locked </span>
<span class="stamnt">e</span>
<span class="csdtag"></CsScore></span>
<span class="csdtag"></CsoundSynthesizer></span>
</pre>
</div>
</div>
<p><br class="example-break" />
</p>
</div>
<div class="refsect1" title="Credits">
<a id="idp39066952"></a>
<h2>Credits</h2>
<p>
</p>
<table border="0" summary="Simple list" class="simplelist">
<tr>
<td>Author: Victor Lazzarini</td>
</tr>
<tr>
<td>November 2004 </td>
</tr>
</table>
<p>
</p>
<p>New plugin in version 5</p>
<p>November 2004.</p>
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