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<div class="refentry" title="sleighbells">
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<h2>
<span class="refentrytitle">sleighbells</span>
</h2>
<p>sleighbells —
Semi-physical model of a sleighbell sound.
</p>
</div>
<div class="refsect1" title="Description">
<a id="idp43034800"></a>
<h2>Description</h2>
<p>
<span class="emphasis"><em>sleighbells</em></span> is a semi-physical model of a sleighbell sound. It is one of the PhISEM percussion opcodes. PhISEM (Physically Informed Stochastic Event Modeling) is an algorithmic approach for simulating collisions of multiple independent sound producing objects.
</p>
</div>
<div class="refsect1" title="Syntax">
<a id="idp43043288"></a>
<h2>Syntax</h2>
<pre class="synopsis">ares <span class="command"><strong>sleighbells</strong></span> kamp, idettack [, inum] [, idamp] [, imaxshake] [, ifreq] \
[, ifreq1] [, ifreq2]</pre>
</div>
<div class="refsect1" title="Initialization">
<a id="idp43044560"></a>
<h2>Initialization</h2>
<p>
<span class="emphasis"><em>idettack</em></span> -- period of time over which all sound is stopped
</p>
<p>
<span class="emphasis"><em>inum</em></span> (optional) -- The number of beads, teeth, bells, timbrels, etc. If zero, the default value is 32.
</p>
<p>
<span class="emphasis"><em>idamp</em></span> (optional) -- the damping factor, as part of this equation:
</p>
<div class="literallayout">
<p>damping_amount = 0.9994 + (idamp * 0.002)</p>
</div>
<p>
</p>
<p>
The default <span class="emphasis"><em>damping_amount</em></span> is 0.9994 which means that the default value of <span class="emphasis"><em>idamp</em></span> is 0. The maximum <span class="emphasis"><em>damping_amount</em></span> is 1.0 (no damping). This means the maximum value for <span class="emphasis"><em>idamp</em></span> is 0.03.
</p>
<p>
The recommended range for <span class="emphasis"><em>idamp</em></span> is usually below 75% of the maximum value.
</p>
<p>
<span class="emphasis"><em>imaxshake</em></span> (optional, default=0) -- amount of energy to add back into the system. The value should be in range 0 to 1.
</p>
<p>
<span class="emphasis"><em>ifreq</em></span> (optional) -- the main resonant frequency. The default value is 2500.
</p>
<p>
<span class="emphasis"><em>ifreq1</em></span> (optional) -- the first resonant frequency. The default value is 5300.
</p>
<p>
<span class="emphasis"><em>ifreq2</em></span> (optional) -- the second resonant frequency. The default value is 6500.
</p>
</div>
<div class="refsect1" title="Performance">
<a id="idp43160448"></a>
<h2>Performance</h2>
<p>
<span class="emphasis"><em>kamp</em></span> -- Amplitude of output. Note: As these instruments are stochastic, this is only an approximation.
</p>
</div>
<div class="refsect1" title="Examples">
<a id="idp43161480"></a>
<h2>Examples</h2>
<p>
Here is an example of the sleighbells opcode. It uses the file <a class="ulink" href="examples/sleighbells.csd" target="_top"><em class="citetitle">sleighbells.csd</em></a>.
</p>
<div class="example">
<a id="idp43162480"></a>
<p class="title">
<strong>Example 778. Example of the sleighbells 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 sleighbells.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
idamp <span class="op">=</span> p4
asig <span class="opc">sleighbells</span> .7, 0.01, 32, idamp
<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 0.00 0.25 0 <span class="comment">;short sound</span>
<span class="stamnt">i</span> 1 0.30 0.25
<span class="stamnt">i</span> 1 0.60 0.25
<span class="stamnt">i</span> 1 0.90 0.25
<span class="stamnt">i</span> 1 1.20 0.25
<span class="stamnt">i</span> 1 1.50 1 .3 <span class="comment">;longer sound</span>
<span class="stamnt">i</span> 1 1.80 0.25 0 <span class="comment">;short sound again</span>
<span class="stamnt">i</span> 1 2.10 0.25
<span class="stamnt">i</span> 1 2.40 0.25
<span class="stamnt">i</span> 1 2.70 0.25
<span class="stamnt">i</span> 1 3.00 0.25
<span class="stamnt">e</span>
<span class="csdtag"></CsScore></span>
<span class="csdtag"></CsoundSynthesizer></span>
</pre>
</div>
</div>
<p><br class="example-break" />
</p>
</div>
<div class="refsect1" title="See Also">
<a id="idp43164792"></a>
<h2>See Also</h2>
<p>
<a class="link" href="bamboo.html" title="bamboo"><em class="citetitle">bamboo</em></a>,
<a class="link" href="dripwater.html" title="dripwater"><em class="citetitle">dripwater</em></a>,
<a class="link" href="guiro.html" title="guiro"><em class="citetitle">guiro</em></a>,
<a class="link" href="tambourine.html" title="tambourine"><em class="citetitle">tambourine</em></a>
</p>
</div>
<div class="refsect1" title="Credits">
<a id="idp43167304"></a>
<h2>Credits</h2>
<p>
</p>
<table border="0" summary="Simple list" class="simplelist">
<tr>
<td>Author: Perry Cook, part of the PhISEM (Physically Informed Stochastic Event Modeling)</td>
</tr>
<tr>
<td>Adapted by John ffitch</td>
</tr>
<tr>
<td>University of Bath, Codemist Ltd.</td>
</tr>
<tr>
<td>Bath, UK</td>
</tr>
</table>
<p>
</p>
<p>New in Csound version 4.07</p>
<p>Added notes by Rasmus Ekman on May 2002.</p>
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