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<div class="refentry" title="trlowest">
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<a id="Indextrlowest" class="indexterm"></a>
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<h2>
<span class="refentrytitle">trlowest</span>
</h2>
<p>trlowest —
Extracts the lowest-frequency track from a streaming track input signal.
</p>
</div>
<div class="refsect1" title="Description">
<a id="idp49569408"></a>
<h2>Description</h2>
<p>
The <span class="emphasis"><em>trlowest</em></span> opcode takes an input containg TRACKS pv streaming signals (as generated,
for instance by <span class="emphasis"><em>partials</em></span>) and outputs only the lowest track. In addition it outputs
two k-rate signals, corresponding to the frequency and amplitude of the lowest track
signal.
</p>
</div>
<div class="refsect1" title="Syntax">
<a id="idp49624584"></a>
<h2>Syntax</h2>
<pre class="synopsis">fsig, kfr, kamp <span class="command"><strong>trlowest</strong></span> fin1, kscal</pre>
</div>
<div class="refsect1" title="Performance">
<a id="idp49625592"></a>
<h2>Performance</h2>
<p>
<span class="emphasis"><em>fsig</em></span> -- output pv stream in TRACKS format
</p>
<p>
<span class="emphasis"><em>kfr</em></span> -- frequency (in Hz) of the lowest-frequency track
</p>
<p>
<span class="emphasis"><em>kamp</em></span> -- amplitude of the lowest-frequency track
</p>
<p>
<span class="emphasis"><em>fin</em></span> -- input pv stream in TRACKS format.
</p>
<p>
<span class="emphasis"><em>kscal</em></span> -- amplitude scaling of output.
</p>
</div>
<div class="refsect1" title="Examples">
<a id="idp49628272"></a>
<h2>Examples</h2>
<p>
Here is an example of the trlowest opcode. It uses the file <a class="ulink" href="examples/trlowest.csd" target="_top"><em class="citetitle">trlowest.csd</em></a>.
</p>
<div class="example">
<a id="idp49629256"></a>
<p class="title">
<strong>Example 901. Example of the trlowest 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 trlowest.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
ain <span class="opc">diskin2</span> "beats.wav", 1
fs1,fsi2 <span class="opc">pvsifd</span> ain, 2048, 512, 1 <span class="comment">; ifd analysis</span>
fst <span class="opc">partials</span> fs1, fsi2, .003, 1, 3, 500 <span class="comment">; partial tracking</span>
flow,kfr,kamp <span class="opc">trlowest</span> fst, 1 <span class="comment">; lowest freq-track </span>
aout <span class="opc">tradsyn</span> flow, 1, 1, 1, 1 <span class="comment">; resynthesis of lowest frequency</span>
<span class="opc">outs</span> aout<span class="op">*</span>2, aout<span class="op">*</span>2
<span class="oblock">endin</span>
<span class="csdtag"></CsInstruments></span>
<span class="csdtag"><CsScore></span>
<span class="stamnt">f</span>1 0 8192 10 1 <span class="comment">;sine wave</span>
<span class="stamnt">i</span> 1 0 3
<span class="stamnt">e</span>
<span class="csdtag"></CsScore></span>
<span class="csdtag"></CsoundSynthesizer></span>
</pre>
</div>
</div>
<p><br class="example-break" />
</p>
<p>
The example above shows partial tracking of an ifd-analysis signal, extraction of
the lowest frequency and resynthesis.
</p>
</div>
<div class="refsect1" title="Credits">
<a id="idp49631872"></a>
<h2>Credits</h2>
<p>
</p>
<table border="0" summary="Simple list" class="simplelist">
<tr>
<td>Author: Victor Lazzarini</td>
</tr>
<tr>
<td>February 2006 </td>
</tr>
</table>
<p>
</p>
<p>New in Csound 5.01</p>
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