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<h2>
<span class="refentrytitle">samphold</span>
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<p>samphold —
Performs a sample-and-hold operation on its input.
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<div class="refsect1" title="Description">
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<h2>Description</h2>
<p>
Performs a sample-and-hold operation on its input.
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<div class="refsect1" title="Syntax">
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<h2>Syntax</h2>
<pre class="synopsis">ares <span class="command"><strong>samphold</strong></span> asig, agate [, ival] [, ivstor]</pre>
<pre class="synopsis">kres <span class="command"><strong>samphold</strong></span> ksig, kgate [, ival] [, ivstor]</pre>
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<div class="refsect1" title="Initialization">
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<h2>Initialization</h2>
<p>
<span class="emphasis"><em>ival, ivstor</em></span> (optional) -- controls initial disposition of internal save space. If <span class="emphasis"><em>ivstor</em></span> is zero the internal <span class="quote">“<span class="quote">hold</span>”</span> value is set to <span class="emphasis"><em>ival</em></span> ; else it retains its previous value. Defaults are 0,0 (i.e. init to zero)
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<div class="refsect1" title="Performance">
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<h2>Performance</h2>
<p>
<span class="emphasis"><em>kgate, xgate</em></span> -- controls whether to hold the signal.
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<p>
<span class="emphasis"><em>samphold</em></span> performs a sample-and-hold operation on its input according to the value of <span class="emphasis"><em>gate</em></span>. If <span class="emphasis"><em>gate != 0</em></span>, the input samples are passed to the output; if <span class="emphasis"><em>gate = 0</em></span>, the last output value is repeated. The controlling <span class="emphasis"><em>gate</em></span> can be a constant, a control signal, or an audio signal.
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<div class="refsect1" title="Examples">
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<h2>Examples</h2>
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<pre class="programlisting">
asrc <span class="opc">buzz</span> 10000, 440, 20, 1 <span class="comment">; band-limited pulse train</span>
adif <span class="opc">diff</span> asrc <span class="comment">; emphasize the highs</span>
anew <span class="opc">balance</span> adif, asrc <span class="comment">; but retain the power</span>
agate <span class="opc">reson</span> asrc, 0, 440 <span class="comment">; use a lowpass of the original</span>
asamp <span class="opc">samphold</span> anew, agate <span class="comment">; to gate the new audiosig</span>
aout <span class="opc">tone</span> asamp, 100 <span class="comment">; smooth out the rough edges</span></pre>
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<div class="refsect1" title="See Also">
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<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="interp.html" title="interp"><em class="citetitle">interp</em></a>,
<a class="link" href="upsamp.html" title="upsamp"><em class="citetitle">upsamp</em></a>
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