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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.
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<div class="refsect1" title="Description">
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<h2>Description</h2>
<p>
Calculates the weighted mean value (i.e. linear interpolation) of two input signals
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<div class="refsect1" title="Syntax">
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<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>
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<div class="refsect1" title="Initialization">
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<h2>Initialization</h2>
<p>
<span class="emphasis"><em>imin</em></span> -- minimum xpoint value (optional, default 0)
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<p>
<span class="emphasis"><em>imax</em></span> -- maximum xpoint value (optional, default 1)
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<div class="refsect1" title="Performance">
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<h2>Performance</h2>
<p>
<span class="emphasis"><em>xsig1</em></span>, <span class="emphasis"><em>xsig2</em></span> -- input signals
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<p>
<span class="emphasis"><em>xpoint</em></span> -- interpolation point between the two values
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<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.
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<p>
These opcodes are useful for crossfading two signals.
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<div class="refsect1" title="Credits">
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<h2>Credits</h2>
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<td>Author: Gabriel Maldonado</td>
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<td>Italy</td>
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<td>October 1998</td>
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<p>New in Csound version 3.49</p>
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