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<div class="refentry" title="port">
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<h2>
<span class="refentrytitle">port</span>
</h2>
<p>port —
Applies portamento to a step-valued control signal.
</p>
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<div class="refsect1" title="Description">
<a id="idp36775336"></a>
<h2>Description</h2>
<p>
Applies portamento to a step-valued control signal.
</p>
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<div class="refsect1" title="Syntax">
<a id="idp36818560"></a>
<h2>Syntax</h2>
<pre class="synopsis">kres <span class="command"><strong>port</strong></span> ksig, ihtim [, isig]</pre>
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<div class="refsect1" title="Initialization">
<a id="idp36819616"></a>
<h2>Initialization</h2>
<p>
<span class="emphasis"><em>ihtim</em></span> -- half-time of the function, in seconds.
</p>
<p>
<span class="emphasis"><em>isig</em></span>
(optional, default=0) -- initial (i.e. previous) value for
internal feedback. The default value is 0. Negative value will
cause initialization to be skipped and last value from previous instance to be used
as initial value for note.
</p>
</div>
<div class="refsect1" title="Performance">
<a id="idp36821152"></a>
<h2>Performance</h2>
<p>
<span class="emphasis"><em>kres</em></span> -- the output signal at control-rate.
</p>
<p>
<span class="emphasis"><em>ksig</em></span> -- the input signal at control-rate.
</p>
<p>
<span class="emphasis"><em>port</em></span> applies portamento to a step-valued control signal. At each new step value, <span class="emphasis"><em>ksig</em></span> is low-pass filtered to move towards that value at a rate determined by <span class="emphasis"><em>ihtim</em></span>. <span class="emphasis"><em>ihtim</em></span> is the <span class="quote">“<span class="quote">half-time</span>”</span> of the function (in seconds), during which the curve will traverse half the distance towards the new value, then half as much again, etc., theoretically never reaching its asymptote. With <a class="link" href="portk.html" title="portk"><em class="citetitle">portk</em></a>, the half-time can be varied at the control rate.
</p>
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<div class="refsect1" title="Examples">
<a id="idp36824592"></a>
<h2>Examples</h2>
<p>
Here is an example of the port opcode. It uses the file <a class="ulink" href="examples/port.csd" target="_top"><em class="citetitle">port.csd</em></a>.
</p>
<div class="example">
<a id="idp36825560"></a>
<p class="title">
<strong>Example 604. Example of the port 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 port.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">0dbfs</span> <span class="op">=</span> 1
<span class="ohdr">nchnls</span> <span class="op">=</span> 2
<span class="oblock">instr</span> 1
aout <span class="opc">diskin2</span> "fox.wav",1, 0, 1
kf,ka <span class="opc">ptrack</span> aout, 512 <span class="comment">; pitch track with winsize=1024</span>
kcps <span class="opc">port</span> kf, 0.01 <span class="comment">; smooth freq</span>
kamp <span class="opc">port</span> ka, 0.01 <span class="comment">; smooth amp</span>
<span class="comment">; drive an oscillator</span>
asig <span class="opc">poscil</span> <span class="opc">ampdb</span>(kamp)<span class="op">*</span>0dbfs, kcps, 1
<span class="opc">outs</span> asig, asig
<span class="oblock">endin</span>
<span class="csdtag"></CsInstruments></span>
<span class="csdtag"><CsScore></span>
<span class="comment">; simple sine wave</span>
<span class="stamnt">f</span> 1 0 4096 10 1
<span class="stamnt">i</span> 1 0 5
<span class="stamnt">e</span>
<span class="csdtag"></CsScore></span>
<span class="csdtag"></CsoundSynthesizer></span>
</pre>
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<p><br class="example-break" />
</p>
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<div class="refsect1" title="See Also">
<a id="idp36827824"></a>
<h2>See Also</h2>
<p>
<a class="link" href="areson.html" title="areson"><em class="citetitle">areson</em></a>,
<a class="link" href="aresonk.html" title="aresonk"><em class="citetitle">aresonk</em></a>,
<a class="link" href="atone.html" title="atone"><em class="citetitle">atone</em></a>,
<a class="link" href="atonek.html" title="atonek"><em class="citetitle">atonek</em></a>,
<a class="link" href="portk.html" title="portk"><em class="citetitle">portk</em></a>,
<a class="link" href="reson.html" title="reson"><em class="citetitle">reson</em></a>,
<a class="link" href="resonk.html" title="resonk"><em class="citetitle">resonk</em></a>,
<a class="link" href="tone.html" title="tone"><em class="citetitle">tone</em></a>,
<a class="link" href="tonek.html" title="tonek"><em class="citetitle">tonek</em></a>
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