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<h2>
<span class="refentrytitle">ntrpol</span>
</h2>
<p>ntrpol —
Calculates the weighted mean value of two input signals.
</p>
</div>
<div class="refsect1">
<a id="idm281472910251720"></a>
<h2>Description</h2>
<p>
Calculates the weighted mean value (i.e. linear interpolation) of two input signals
</p>
</div>
<div class="refsect1">
<a id="idm281472910250424"></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">
<a id="idm281472910196392"></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">
<a id="idm281472910193864"></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>
</div>
<div class="refsect1">
<a id="idm281472910185288"></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="idm281472910183432"></a>
<p class="title">
<strong>Example 610. 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>
<div class="refsect1">
<a id="idm281472733598440"></a>
<pre class="programlisting">
<span class="nt"><CsoundSynthesizer></span>
<span class="nt"><CsOptions></span>
<span class="c1">; Select audio/midi flags here according to platform</span>
-odac <span class="c1">;;;realtime audio out</span>
<span class="c1">;-iadc ;;;uncomment -iadc if real audio input is needed too</span>
<span class="c1">; For Non-realtime ouput leave only the line below:</span>
<span class="c1">; -o ntrpol.wav -W ;;; for file output any platform</span>
<span class="nt"></CsOptions></span>
<span class="nt"><CsInstruments></span>
<span class="vg">sr</span> <span class="o">=</span> <span class="mi">44100</span>
<span class="vg">ksmps</span> <span class="o">=</span> <span class="mi">32</span>
<span class="vg">nchnls</span> <span class="o">=</span> <span class="mi">2</span>
<span class="vg">0dbfs</span> <span class="o">=</span> <span class="mi">1</span>
gi<span class="n">Sin</span> <span class="nb">ftgen</span> <span class="mi">1</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">1024</span><span class="p">,</span> <span class="mi">10</span><span class="p">,</span> <span class="mi">1</span>
<span class="kd">instr</span> <span class="nf">1</span>
a<span class="n">vco</span> <span class="nb">vco2</span> <span class="mf">.5</span><span class="p">,</span> <span class="mi">110</span> <span class="c1">;sawtootyh wave</span>
a<span class="n">sin</span> <span class="nb">poscil</span> <span class="mf">.5</span><span class="p">,</span> <span class="mi">220</span><span class="p">,</span> gi<span class="n">Sin</span> <span class="c1">;sine wave but octave higher</span>
k<span class="n">x</span> <span class="nb">linseg</span> <span class="mi">0</span><span class="p">,</span> <span class="nb">p3</span><span class="o">*</span><span class="mf">.4</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="nb">p3</span><span class="o">*</span><span class="mf">.6</span><span class="p">,</span> <span class="mi">1</span> <span class="c1">;crossfade between saw and sine</span>
a<span class="n">sig</span> <span class="nb">ntrpol</span> a<span class="n">vco</span><span class="p">,</span> a<span class="n">sin</span><span class="p">,</span> k<span class="n">x</span>
<span class="nb">outs</span> a<span class="n">sig</span><span class="p">,</span> a<span class="n">sig</span>
<span class="kd">endin</span>
<span class="nt"></CsInstruments></span>
<span class="nt"><CsScore></span>
<span class="nb">i</span> <span class="mi">1</span> <span class="mi">0</span> <span class="mi">5</span>
<span class="nb">e</span>
<span class="nt"></CsScore></span>
<span class="nt"></CsoundSynthesizer></span>
</pre>
</div>
</div>
</div>
<p><br class="example-break" />
</p>
</div>
<div class="refsect1">
<a id="idm281472910179144"></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>
</table>
<p>
</p>
<p>New in Csound version 3.49</p>
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