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<div class="refentry" title="cps2pch">
<a id="cps2pch"></a>
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<a id="IndexCps2pch" class="indexterm"></a>
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<h2>
<span class="refentrytitle">cps2pch</span>
</h2>
<p>cps2pch —
Converts a pitch-class value into cycles-per-second (Hz) for equal divisions of the octave.
</p>
</div>
<div class="refsect1" title="Description">
<a id="idp16677728"></a>
<h2>Description</h2>
<p>
Converts a pitch-class value into cycles-per-second (Hz) for equal divisions of the octave.
</p>
</div>
<div class="refsect1" title="Syntax">
<a id="idp16707384"></a>
<h2>Syntax</h2>
<pre class="synopsis">icps <span class="command"><strong>cps2pch</strong></span> ipch, iequal</pre>
</div>
<div class="refsect1" title="Initialization">
<a id="idp16708464"></a>
<h2>Initialization</h2>
<p>
<span class="emphasis"><em>ipch</em></span> -- Input number of the form 8ve.pc, indicating an 'octave' and which note in the octave.
</p>
<p>
<span class="emphasis"><em>iequal</em></span> -- If positive, the number of equal intervals into which the 'octave' is divided. Must be less than or equal to 100. If negative, is the number of a table of frequency multipliers.
</p>
<div class="note" title="Note" style="margin-left: 0.5in; margin-right: 0.5in;">
<table border="0" summary="Note: Note">
<tr>
<td rowspan="2" align="center" valign="top" width="25">
<img alt="[Note]" src="images/note.png" />
</td>
<th align="left">Note</th>
</tr>
<tr>
<td align="left" valign="top">
<p>
</p>
<div class="orderedlist">
<ol class="orderedlist" type="1">
<li class="listitem">
<p>The following are essentially the same
</p>
<pre class="programlisting">
ia <span class="op">=</span> <span class="opc">cpspch</span>(8.02)
ib <span class="opc">cps2pch</span> 8.02, 12
ic <span class="opc">cpsxpch</span> 8.02, 12, 2, 1.02197503906</pre>
<p>
</p>
</li>
<li class="listitem">
<p>
These are opcodes not functions
</p>
</li>
<li class="listitem">
<p>
Negative values of <span class="emphasis"><em>ipch</em></span> are allowed.
</p>
</li>
</ol>
</div>
<p>
</p>
</td>
</tr>
</table>
</div>
</div>
<div class="refsect1" title="Examples">
<a id="idp16714880"></a>
<h2>Examples</h2>
<p>
Here is an example of the cps2pch opcode. It uses the file <a class="ulink" href="examples/cps2pch.csd" target="_top"><em class="citetitle">cps2pch.csd</em></a>.
</p>
<div class="example">
<a id="idp16715864"></a>
<p class="title">
<strong>Example 127. Example of the cps2pch 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>
<span class="comment">; Audio out Audio in</span>
-odac -iadc <span class="comment">;;;RT audio I/O</span>
<span class="comment">; For Non-realtime ouput leave only the line below:</span>
<span class="comment">; -o cps2pch.wav -W ;;; for file output any platform</span>
<span class="csdtag"></CsOptions></span>
<span class="csdtag"><CsInstruments></span>
<span class="comment">; Initialize the global variables.</span>
<span class="ohdr">sr</span> <span class="op">=</span> 44100
<span class="ohdr">kr</span> <span class="op">=</span> 4410
<span class="ohdr">ksmps</span> <span class="op">=</span> 10
<span class="ohdr">nchnls</span> <span class="op">=</span> 1
<span class="comment">; Instrument #1.</span>
<span class="oblock">instr</span> 1
<span class="comment">; Use a normal twelve-tone scale.</span>
ipch <span class="op">=</span> 8.02
iequal <span class="op">=</span> 12
icps <span class="opc">cps2pch</span> ipch, iequal
<span class="opc">print</span> icps
<span class="oblock">endin</span>
<span class="csdtag"></CsInstruments></span>
<span class="csdtag"><CsScore></span>
<span class="comment">; Play Instrument #1 for one second.</span>
<span class="stamnt">i</span> 1 0 1
<span class="stamnt">e</span>
<span class="csdtag"></CsScore></span>
<span class="csdtag"></CsoundSynthesizer></span>
</pre>
</div>
</div>
<p><br class="example-break" />
Its output should include lines like this:
</p>
<pre class="screen">instr 1: icps = 293.666</pre>
<p>
</p>
<p>
Here is an example of the cps2pch opcode using a table of frequency multipliers. It uses the file <a class="ulink" href="examples/cps2pch_ftable.csd" target="_top"><em class="citetitle">cps2pch_ftable.csd</em></a>.
</p>
<div class="example">
<a id="idp16719200"></a>
<p class="title">
<strong>Example 128. Example of the cps2pch opcode using a table of frequency multipliers.</strong>
</p>
<div class="example-contents">
<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>
<span class="comment">; Audio out Audio in</span>
-odac -iadc <span class="comment">;;;RT audio I/O</span>
<span class="comment">; For Non-realtime ouput leave only the line below:</span>
<span class="comment">; -o cps2pch_ftable.wav -W ;;; for file output any platform</span>
<span class="csdtag"></CsOptions></span>
<span class="csdtag"><CsInstruments></span>
<span class="comment">; Initialize the global variables.</span>
<span class="ohdr">sr</span> <span class="op">=</span> 44100
<span class="ohdr">kr</span> <span class="op">=</span> 4410
<span class="ohdr">ksmps</span> <span class="op">=</span> 10
<span class="ohdr">nchnls</span> <span class="op">=</span> 1
<span class="comment">; Instrument #1.</span>
<span class="oblock">instr</span> 1
ipch <span class="op">=</span> 8.02
<span class="comment">; Use Table #1, a table of frequency multipliers.</span>
icps <span class="opc">cps2pch</span> ipch, <span class="op">-</span>1
<span class="opc">print</span> icps
<span class="oblock">endin</span>
<span class="csdtag"></CsInstruments></span>
<span class="csdtag"><CsScore></span>
<span class="comment">; Table #1: a table of frequency multipliers.</span>
<span class="comment">; Creates a 10-note scale of unequal divisions.</span>
<span class="stamnt">f</span> 1 0 16 -2 1 1.1 1.2 1.3 1.4 1.6 1.7 1.8 1.9
<span class="comment">; Play Instrument #1 for one second.</span>
<span class="stamnt">i</span> 1 0 1
<span class="stamnt">e</span>
<span class="csdtag"></CsScore></span>
<span class="csdtag"></CsoundSynthesizer></span>
</pre>
</div>
</div>
<p><br class="example-break" />
Its output should include lines like this:
</p>
<pre class="screen">instr 1: icps = 313.951</pre>
<p>
</p>
<p>
Here is an example of the cps2pch opcode using a 19ET scale. It uses the file <a class="ulink" href="examples/cps2pch_19et.csd" target="_top"><em class="citetitle">cps2pch_19et.csd</em></a>.
</p>
<div class="example">
<a id="idp16721304"></a>
<p class="title">
<strong>Example 129. Example of the cps2pch opcode using a 19ET scale.</strong>
</p>
<div class="example-contents">
<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>
<span class="comment">; Audio out Audio in</span>
-odac -iadc <span class="comment">;;;RT audio I/O</span>
<span class="comment">; For Non-realtime ouput leave only the line below:</span>
<span class="comment">; -o cps2pch_19et.wav -W ;;; for file output any platform</span>
<span class="csdtag"></CsOptions></span>
<span class="csdtag"><CsInstruments></span>
<span class="comment">; Initialize the global variables.</span>
<span class="ohdr">sr</span> <span class="op">=</span> 44100
<span class="ohdr">kr</span> <span class="op">=</span> 4410
<span class="ohdr">ksmps</span> <span class="op">=</span> 10
<span class="ohdr">nchnls</span> <span class="op">=</span> 1
<span class="comment">; Instrument #1.</span>
<span class="oblock">instr</span> 1
<span class="comment">; Use 19ET scale.</span>
ipch <span class="op">=</span> 8.02
iequal <span class="op">=</span> 19
icps <span class="opc">cps2pch</span> ipch, iequal
<span class="opc">print</span> icps
<span class="oblock">endin</span>
<span class="csdtag"></CsInstruments></span>
<span class="csdtag"><CsScore></span>
<span class="comment">; Play Instrument #1 for one second.</span>
<span class="stamnt">i</span> 1 0 1
<span class="stamnt">e</span>
<span class="csdtag"></CsScore></span>
<span class="csdtag"></CsoundSynthesizer></span>
</pre>
</div>
</div>
<p><br class="example-break" />
Its output should include lines like this:
</p>
<pre class="screen">instr 1: icps = 281.429</pre>
<p>
</p>
</div>
<div class="refsect1" title="See Also">
<a id="idp16722720"></a>
<h2>See Also</h2>
<p>
<a class="link" href="cpspch.html" title="cpspch"><em class="citetitle">cpspch</em></a>,
<a class="link" href="cpsxpch.html" title="cpsxpch"><em class="citetitle">cpsxpch</em></a>
</p>
</div>
<div class="refsect1" title="Credits">
<a id="idp16724280"></a>
<h2>Credits</h2>
<p>
</p>
<table border="0" summary="Simple list" class="simplelist">
<tr>
<td>Author: John ffitch</td>
</tr>
<tr>
<td>University of Bath/Codemist Ltd.</td>
</tr>
<tr>
<td>Bath, UK</td>
</tr>
<tr>
<td>1997</td>
</tr>
</table>
<p>
</p>
<p>New in Csound version 3.492</p>
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