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<div class="refentry" title="temposcal">
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<h2>
<span class="refentrytitle">temposcal</span>
</h2>
<p>temposcal —
Phase-locked vocoder processing with onset detection/processing, 'tempo-scaling'.
</p>
</div>
<div class="refsect1" title="Description">
<a id="idp48739496"></a>
<h2>Description</h2>
<p>
<span class="emphasis"><em>temposcal</em></span> implements phase-locked vocoder processing using function tables
containing sampled-sound sources, with <a class="link" href="GEN01.html" title="GEN01"><em class="citetitle">GEN01</em></a>, and
<span class="emphasis"><em>temposcal</em></span> will accept deferred allocation tables.
</p>
<p>
This opcode allows for time and frequency-independent scaling. Time is advanced internally, but controlled by a tempo scaling parameter; when an onset is detected, timescaling is momentarily stopped to avoid smearing of attacks. The quality of the effect is generally improved with phase locking switched on.
</p>
<p>
<span class="emphasis"><em>temposcal</em></span> will also scale pitch, independently of frequency, using a transposition factor (k-rate).
</p>
</div>
<div class="refsect1" title="Syntax">
<a id="idp48784768"></a>
<h2>Syntax</h2>
<pre class="synopsis">asig <span class="command"><strong>temposcal</strong></span> ktimescal, kamp, kpitch, ktab, klock [,ifftsize, idecim, ithresh]
</pre>
</div>
<div class="refsect1" title="Initialization">
<a id="idp48785944"></a>
<h2>Initialization</h2>
<p>
<span class="emphasis"><em>ifftsize</em></span> -- FFT size (power-of-two), defaults to 2048.
</p>
<p>
<span class="emphasis"><em>idecim</em></span> -- decimation, defaults to 4 (meaning hopsize = fftsize/4)
</p>
<p>
<span class="emphasis"><em>idbthresh</em></span> -- threshold based on dB power spectrum ratio between two successive windows. A detected ratio above it will cancel timescaling momentarily, to avoid smearing (defaults to 1)
</p>
</div>
<div class="refsect1" title="Performance">
<a id="idp48787872"></a>
<h2>Performance</h2>
<p>
<span class="emphasis"><em>ktimescal</em></span> -- timescaling ratio, < 1 stretch, > 1 contract.
</p>
<p>
<span class="emphasis"><em>kamp</em></span> -- amplitude scaling
</p>
<p>
<span class="emphasis"><em>kpitch</em></span> -- grain pitch scaling (1=normal pitch, < 1 lower, > 1 higher; negative, backwards)
</p>
<p>
<span class="emphasis"><em>klock</em></span> -- 0 or 1, to switch phase-locking on/off
</p>
<p>
<span class="emphasis"><em>ktab</em></span> -- source signal function table. Deferred-allocation tables (see
<a class="link" href="GEN01.html" title="GEN01"><em class="citetitle">GEN01</em></a>) are accepted, but the opcode
expects a mono source. Tables can be switched at k-rate.
</p>
</div>
<div class="refsect1" title="Examples">
<a id="idp48791448"></a>
<h2>Examples</h2>
<p>
Here is an example of the temposcal opcode. It uses the file <a class="ulink" href="examples/temposcal.csd" target="_top"><em class="citetitle">temposcal.csd</em></a>.
</p>
<div class="example">
<a id="idp48792440"></a>
<p class="title">
<strong>Example 876. Example of the temposcal 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 temposcal.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
<span class="oblock">instr</span> 1
ilock <span class="op">=</span> p4
itab <span class="op">=</span> 1
ipitch <span class="op">=</span> 1
iamp <span class="op">=</span> 0.8
ktime <span class="opc">linseg</span> 0.3, p3<span class="op">/</span>2, 0.8, p3<span class="op">/</span>2, 0.3
asig <span class="opc">temposcal</span> ktime, iamp, ipitch, itab, ilock
<span class="opc">outs</span> asig, asig
<span class="oblock">endin</span>
<span class="csdtag"></CsInstruments></span>
<span class="csdtag"><CsScore></span>
<span class="stamnt">f</span> 1 0 0 1 "<span class="stamnt">f</span>ox.wav" 0 4 0
<span class="stamnt">i</span> 1 0 3.8 0 <span class="comment">;no locking</span>
<span class="stamnt">i</span> 1 4 3.8 1 <span class="comment">;locking</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="idp48794720"></a>
<h2>Credits</h2>
<p>
</p>
<table border="0" summary="Simple list" class="simplelist">
<tr>
<td>Author: Victor Lazzarini</td>
</tr>
<tr>
<td>February 2010</td>
</tr>
</table>
<p>
</p>
<p>New plugin in version 5.13</p>
<p>February 2005.</p>
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