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<h2>
<span class="refentrytitle">interp</span>
</h2>
<p>interp —
Converts a control signal to an audio signal using linear interpolation.
</p>
</div>
<div class="refsect1" title="Description">
<a id="idp27413592"></a>
<h2>Description</h2>
<p>
Converts a control signal to an audio signal using linear interpolation.
</p>
</div>
<div class="refsect1" title="Syntax">
<a id="idp27414376"></a>
<h2>Syntax</h2>
<pre class="synopsis">ares <span class="command"><strong>interp</strong></span> ksig [, iskip] [, imode]</pre>
</div>
<div class="refsect1" title="Initialization">
<a id="idp27423912"></a>
<h2>Initialization</h2>
<p>
<span class="emphasis"><em>iskip</em></span> (optional, default=0) -- initial disposition of internal save space (see <a class="link" href="reson.html" title="reson"><em class="citetitle">reson</em></a>). The default value is 0.
</p>
<p>
<span class="emphasis"><em>imode</em></span> (optional, default=0) -- sets the initial output value to the first k-rate input instead of zero. The following graphs show the output of interp with a constant input value, in the original, when skipping init, and in the new mode:
</p>
<div class="example">
<a id="idp27426112"></a>
<p class="title">
<strong>Example 374. iskip=0, imode=0</strong>
</p>
<div class="example-contents">
<div class="literallayout">
<p><br />
| ________<br />
| / <br />
| / <br />
| / <br />
|/ <br />
-+------------<br />
| <br />
</p>
</div>
</div>
</div>
<p><br class="example-break" />
</p>
<div class="example">
<a id="idp27427168"></a>
<p class="title">
<strong>Example 375. iskip=1, imode=0</strong>
</p>
<div class="example-contents">
<div class="literallayout">
<p><br />
(prev)<br />
| __________<br />
| / <br />
|/ <br />
| <br />
| <br />
-+------------<br />
| <br />
</p>
</div>
</div>
</div>
<p><br class="example-break" />
</p>
<div class="example">
<a id="idp27428192"></a>
<p class="title">
<strong>Example 376. iskip=0, imode=1</strong>
</p>
<div class="example-contents">
<div class="literallayout">
<p><br />
|____________<br />
|<br />
|<br />
|<br />
|<br />
-+------------<br />
|<br />
</p>
</div>
</div>
</div>
<p><br class="example-break" />
</p>
</div>
<div class="refsect1" title="Performance">
<a id="idp27487808"></a>
<h2>Performance</h2>
<p>
<span class="emphasis"><em>ksig</em></span> -- input k-rate signal.
</p>
<p>
<span class="emphasis"><em>interp</em></span> converts a control signal to an audio signal. It uses linear interpolation between successive kvals.
</p>
</div>
<div class="refsect1" title="Examples">
<a id="idp27489328"></a>
<h2>Examples</h2>
<p>
Here is an example of the interp opcode. It uses the file <a class="ulink" href="examples/interp.csd" target="_top"><em class="citetitle">interp.csd</em></a>.
</p>
<div class="example">
<a id="idp27490280"></a>
<p class="title">
<strong>Example 377. Example of the interp 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>
<span class="comment">; Audio out Audio in No messages</span>
-odac -iadc -d <span class="comment">;;;RT audio I/O</span>
<span class="comment">; For Non-realtime ouput leave only the line below:</span>
<span class="comment">; -o interp.wav -W ;;; for file output any platform</span>
<span class="csdtag"></CsOptions></span>
<span class="csdtag"><CsInstruments></span>
<span class="comment">; Initialize the global variables.</span>
<span class="ohdr">sr</span> <span class="op">=</span> 8000
<span class="ohdr">kr</span> <span class="op">=</span> 8
<span class="ohdr">ksmps</span> <span class="op">=</span> 1000
<span class="ohdr">nchnls</span> <span class="op">=</span> 1
<span class="comment">; Instrument #1 - a simple instrument.</span>
<span class="oblock">instr</span> 1
<span class="comment">; Create an amplitude envelope.</span>
kamp <span class="opc">linseg</span> 0, p3<span class="op">/</span>2, 20000, p3<span class="op">/</span>2, 0
<span class="comment">; The amplitude envelope will sound rough because it</span>
<span class="comment">; jumps every ksmps period, 1000.</span>
a1 <span class="opc">oscil</span> kamp, 440, 1
<span class="opc">out</span> a1
<span class="oblock">endin</span>
<span class="comment">; Instrument #2 - a smoother sounding instrument.</span>
<span class="oblock">instr</span> 2
<span class="comment">; Create an amplitude envelope.</span>
kamp <span class="opc">linseg</span> 0, p3<span class="op">/</span>2, 25000, p3<span class="op">/</span>2, 0
aamp <span class="opc">interp</span> kamp
<span class="comment">; The amplitude envelope will sound smoother due to</span>
<span class="comment">; linear interpolation at the higher a-rate, 8000.</span>
a1 <span class="opc">oscil</span> aamp, 440, 1
<span class="opc">out</span> a1
<span class="oblock">endin</span>
<span class="csdtag"></CsInstruments></span>
<span class="csdtag"><CsScore></span>
<span class="comment">; Table #1, a sine wave.</span>
<span class="stamnt">f</span> 1 0 256 10 1
<span class="comment">; Play Instrument #1 for two seconds.</span>
<span class="stamnt">i</span> 1 0 2
<span class="comment">; Play Instrument #2 for two seconds.</span>
<span class="stamnt">i</span> 2 2 2
<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="See Also">
<a id="idp27492552"></a>
<h2>See Also</h2>
<p>
<a class="link" href="diff.html" title="diff"><em class="citetitle">diff</em></a>,
<a class="link" href="downsamp.html" title="downsamp"><em class="citetitle">downsamp</em></a>,
<a class="link" href="integ.html" title="integ"><em class="citetitle">integ</em></a>,
<a class="link" href="samphold.html" title="samphold"><em class="citetitle">samphold</em></a>,
<a class="link" href="upsamp.html" title="upsamp"><em class="citetitle">upsamp</em></a>
</p>
<p> More information on this opcode: <a class="ulink" href="http://www.csounds.com/journal/issue10/CsoundRates.html" target="_top"><em class="citetitle">http://www.csounds.com/journal/issue10/CsoundRates.html</em></a> , written by Andrés Cabrera </p>
</div>
<div class="refsect1" title="Credits">
<a id="idp27496360"></a>
<h2>Credits</h2>
<p>Updated November 2002, thanks to a note from both Rasmus Ekman and Istvan Varga.</p>
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