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<h2>
<span class="refentrytitle">tonek</span>
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<p>tonek —
A first-order recursive low-pass filter with variable frequency response.
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<div class="refsect1" title="Description">
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<h2>Description</h2>
<p>
A first-order recursive low-pass filter with variable frequency response.
</p>
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<div class="refsect1" title="Syntax">
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<h2>Syntax</h2>
<pre class="synopsis">kres <span class="command"><strong>tonek</strong></span> ksig, khp [, iskip]</pre>
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<div class="refsect1" title="Initialization">
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<h2>Initialization</h2>
<p>
<span class="emphasis"><em>iskip</em></span> (optional, default=0) -- initial disposition of internal data space. Since filtering incorporates a feedback loop of previous output, the initial status of the storage space used is significant. A zero value will clear the space; a non-zero value will allow previous information to remain. The default value is 0.
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<div class="refsect1" title="Performance">
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<h2>Performance</h2>
<p>
<span class="emphasis"><em>kres</em></span> -- the output signal at control-rate.
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<p>
<span class="emphasis"><em>ksig</em></span> -- the input signal at control-rate.
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<p>
<span class="emphasis"><em>khp</em></span> -- the response curve's half-power point, in Hertz. Half power is defined as peak power / root 2.
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<p>
<span class="emphasis"><em>tonek</em></span> is like <a class="link" href="tone.html" title="tone"><em class="citetitle">tone</em></a> except its
output is at control-rate rather than audio rate.
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<div class="refsect1" title="See Also">
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<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="port.html" title="port"><em class="citetitle">port</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>
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<div class="refsect1" title="Credits">
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<h2>Credits</h2>
<p>
</p>
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<td>Author: Robin Whittle</td>
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<td>Australia</td>
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<td>May 1997</td>
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