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<div class="refentry" title="ntrpol">
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<h2>
<span class="refentrytitle">ntrpol</span>
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<p>ntrpol —
Calculates the weighted mean value of two input signals.
</p>
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<div class="refsect1" title="Description">
<a id="idp33168104"></a>
<h2>Description</h2>
<p>
Calculates the weighted mean value (i.e. linear interpolation) of two input signals
</p>
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<div class="refsect1" title="Syntax">
<a id="idp33168800"></a>
<h2>Syntax</h2>
<pre class="synopsis">ares <span class="command"><strong>ntrpol</strong></span> asig1, asig2, kpoint [, imin] [, imax]</pre>
<pre class="synopsis">ires <span class="command"><strong>ntrpol</strong></span> isig1, isig2, ipoint [, imin] [, imax]</pre>
<pre class="synopsis">kres <span class="command"><strong>ntrpol</strong></span> ksig1, ksig2, kpoint [, imin] [, imax]</pre>
</div>
<div class="refsect1" title="Initialization">
<a id="idp33189920"></a>
<h2>Initialization</h2>
<p>
<span class="emphasis"><em>imin</em></span> -- minimum xpoint value (optional, default 0)
</p>
<p>
<span class="emphasis"><em>imax</em></span> -- maximum xpoint value (optional, default 1)
</p>
</div>
<div class="refsect1" title="Performance">
<a id="idp33206768"></a>
<h2>Performance</h2>
<p>
<span class="emphasis"><em>xsig1</em></span>, <span class="emphasis"><em>xsig2</em></span> -- input signals
</p>
<p>
<span class="emphasis"><em>xpoint</em></span> -- interpolation point between the two values
</p>
<p>
<span class="emphasis"><em>ntrpol</em></span> opcode outputs the linear interpolation between two input values. <span class="emphasis"><em>xpoint</em></span> is the distance of evaluation point from the first value. With the default values of <span class="emphasis"><em>imin</em></span> and <span class="emphasis"><em>imax</em></span>, (0 and 1) a zero value indicates no distance from the first value and the maximum distance from the second one. With a 0.5 value, <span class="emphasis"><em>ntrpol</em></span> will output the mean value of the two inputs, indicating the exact half point between <span class="emphasis"><em>xsig1</em></span> and <span class="emphasis"><em>xsig2</em></span>. A 1 value indicates the maximum distance from the first value and no distance from the second one. The range of <span class="emphasis"><em>xpoint</em></span> can be also defined with <span class="emphasis"><em>imin</em></span> and <span class="emphasis"><em>imax</em></span> to make its management easier.
</p>
<p>
These opcodes are useful for crossfading two signals.
</p>
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<div class="refsect1" title="Examples">
<a id="idp33211408"></a>
<h2>Examples</h2>
<p>
Here is an example of the ntrpol opcode. It uses the file <a class="ulink" href="examples/ntrpol.csd" target="_top"><em class="citetitle">ntrpol.csd</em></a>.
</p>
<div class="example">
<a id="idp33212376"></a>
<p class="title">
<strong>Example 517. Example of the ntrpol 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 real audio input is needed too</span>
<span class="comment">; For Non-realtime ouput leave only the line below:</span>
<span class="comment">; -o ntrpol.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
giSin <span class="ohdr">ftgen</span> 1, 0, 1024, 10, 1
<span class="oblock">instr</span> 1
avco <span class="opc">vco2</span> .5, 110 <span class="comment">;sawtootyh wave</span>
asin <span class="opc">poscil</span> .5, 220, giSin <span class="comment">;sine wave but octave higher</span>
kx <span class="opc">linseg</span> 0, p3<span class="op">*</span>.4, 1, p3<span class="op">*</span>.6, 1 <span class="comment">;crossfade between saw and sine</span>
asig <span class="opc">ntrpol</span> avco, asin, kx
<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">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="Credits">
<a id="idp33214648"></a>
<h2>Credits</h2>
<p>
</p>
<table border="0" summary="Simple list" class="simplelist">
<tr>
<td>Author: Gabriel Maldonado</td>
</tr>
<tr>
<td>Italy</td>
</tr>
<tr>
<td>October 1998</td>
</tr>
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<p>
</p>
<p>New in Csound version 3.49</p>
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