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<div class="refentry" title="samphold">
<a id="samphold"></a>
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<a id="IndexSamphold" class="indexterm"></a>
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<h2>
<span class="refentrytitle">samphold</span>
</h2>
<p>samphold —
Performs a sample-and-hold operation on its input.
</p>
</div>
<div class="refsect1" title="Description">
<a id="idp41228536"></a>
<h2>Description</h2>
<p>
Performs a sample-and-hold operation on its input.
</p>
</div>
<div class="refsect1" title="Syntax">
<a id="idp41214912"></a>
<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>
</div>
<div class="refsect1" title="Initialization">
<a id="idp41216720"></a>
<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)
</p>
</div>
<div class="refsect1" title="Performance">
<a id="idp41267208"></a>
<h2>Performance</h2>
<p>
<span class="emphasis"><em>kgate, xgate</em></span> -- controls whether to hold the signal.
</p>
<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.
</p>
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<div class="refsect1" title="Examples">
<a id="idp41269600"></a>
<h2>Examples</h2>
<p>
</p>
<div class="informalexample">
<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>
</div>
<p>
</p>
<p>
Here is another example of the samphold opcode. It uses the file <a class="ulink" href="examples/samphold.csd" target="_top"><em class="citetitle">samphold.csd</em></a>.
</p>
<div class="example">
<a id="idp41275712"></a>
<p class="title">
<strong>Example 735. Example of the samphold 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 realtime audio input is needed too</span>
<span class="comment">; For Non-realtime ouput leave only the line below:</span>
<span class="comment">; -o samphold.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
<span class="oblock">instr</span> 1
kx <span class="opc">line</span> <span class="op">-</span>1, p3, 1 <span class="comment">; between -1 and +1 </span>
ktrig <span class="opc">metro</span> 1 <span class="comment">; triggers 1 time per second </span>
kval <span class="opc">samphold</span> kx, ktrig <span class="comment">; change value whenever ktrig = 1 </span>
<span class="opc">printk2</span> kval <span class="comment">; will print every time kval changes </span>
asig <span class="opc">diskin2</span> "flute.aiff", 1<span class="op">+</span>kval, 0, 1
<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 11
<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="See Also">
<a id="idp41277992"></a>
<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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