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<div class="refentry" title="cpstuni">
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<h2>
<span class="refentrytitle">cpstuni</span>
</h2>
<p>cpstuni —
Returns micro-tuning values at init-rate.
</p>
</div>
<div class="refsect1" title="Description">
<a id="idp17028056"></a>
<h2>Description</h2>
<p>
Returns micro-tuning values at init-rate.
</p>
</div>
<div class="refsect1" title="Syntax">
<a id="idp17028776"></a>
<h2>Syntax</h2>
<pre class="synopsis">icps <span class="command"><strong>cpstuni</strong></span> index, ifn</pre>
</div>
<div class="refsect1" title="Initialization">
<a id="idp17083136"></a>
<h2>Initialization</h2>
<p>
<span class="emphasis"><em>icps</em></span> -- Return value in cycles per second.
</p>
<p>
<span class="emphasis"><em>index</em></span> -- An integer number denoting an index of scale.
</p>
<p>
<span class="emphasis"><em>ifn</em></span> -- Function table containing the parameters (numgrades, interval, basefreq, basekeymidi) and the tuning ratios.
</p>
</div>
<div class="refsect1" title="Performance">
<a id="idp17085232"></a>
<h2>Performance</h2>
<p>
These opcodes are similar to <a class="link" href="cpstmid.html" title="cpstmid"><em class="citetitle">cpstmid</em></a>, but work without necessity of MIDI.
</p>
<p>
<span class="emphasis"><em>cpstuni</em></span> works at init-rate. It allows fully customized micro-tuning scales. It requires a function table number containing the tuning ratios, and some other parameters stored in the function table itself.
</p>
<p>
The <span class="emphasis"><em>index</em></span> argument should be filled with integer numbers expressing the grade of given scale to be converted in cps. The function table <span class="emphasis"><em>ifn</em></span> should be generated by <a class="link" href="GEN02.html" title="GEN02"><em class="citetitle">GEN02</em></a> and the first four values stored in this function are parameters that express:
</p>
<div class="itemizedlist">
<ul class="itemizedlist" type="disc">
<li class="listitem">
<p>numgrades -- The number of grades of the micro-tuning scale.</p>
</li>
<li class="listitem">
<p>interval -- The frequency range covered before repeating the grade ratios, for example 2 for one octave, 1.5 for a fifth etcetera.</p>
</li>
<li class="listitem">
<p>basefreq -- The base frequency of the scale in cycles per second.</p>
</li>
<li class="listitem">
<p>basekey -- The integer index of the scale to which to assign basefreq unmodified.</p>
</li>
</ul>
</div>
<p>
</p>
<p>
After these four values, the user can begin to insert the tuning ratios. For example, for a standard 12-grade scale with the base-frequency of 261 cps assigned to the key-number 60, the corresponding f-statement in the score to generate the table should be:
</p>
<div class="informalexample">
<pre class="programlisting">
<span class="comment">; numgrades basefreq tuning-ratios (eq.temp) .......</span>
<span class="comment">; interval basekey</span>
<span class="stamnt">f</span>1 0 64 -2 12 2 261 60 1 1.059463 1.12246 1.18920 ..etc...</pre>
</div>
<p>
</p>
<p>
Another example with a 24-grade scale with a base frequency of 440 assigned
to the key-number 48, and a repetition interval of 1.5:
</p>
<div class="informalexample">
<pre class="programlisting">
<span class="comment">; numgrades basefreq tuning-ratios .......</span>
<span class="comment">; interval basekey</span>
<span class="stamnt">f</span>1 0 64 -2 24 1.5 440 48 1 1.01 1.02 1.03 ..etc...</pre>
</div>
<p>
</p>
</div>
<div class="refsect1" title="Examples">
<a id="idp17095048"></a>
<h2>Examples</h2>
<p>
Here is an example of the cpstuni opcode. It uses the file <a class="ulink" href="examples/cpstuni.csd" target="_top"><em class="citetitle">cpstuni.csd</em></a>.
</p>
<div class="example">
<a id="idp17096032"></a>
<p class="title">
<strong>Example 138. Example of the cpstuni 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 cpstuni.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">; Table #1, a normal 12-tone equal temperament scale.</span>
<span class="comment">; numgrades = 12 (twelve tones)</span>
<span class="comment">; interval = 2 (one octave)</span>
<span class="comment">; basefreq = 261.659 (Middle C)</span>
<span class="comment">; basekeymidi = 60 (Middle C)</span>
gitemp <span class="ohdr">ftgen</span> 1, 0, 64, <span class="op">-</span>2, 12, 2, 261.659, 60, 1.00, \
1.059, 1.122, 1.189, 1.260, 1.335, 1.414, \
1.498, 1.588, 1.682, 1.782, 1.888, 2.000
<span class="comment">; Instrument #1.</span>
<span class="oblock">instr</span> 1
<span class="comment">; Use Table #1.</span>
ifn <span class="op">=</span> 1
<span class="comment">; If the base key (note #60) is C, then 9 notes </span>
<span class="comment">; above it (note #60 + 9 = note #69) should be A.</span>
index <span class="op">=</span> 69
i1 <span class="opc">cpstuni</span> index, ifn
<span class="opc">print</span> i1
<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: i1 = 440.110</pre>
<p>
</p>
</div>
<div class="refsect1" title="See Also">
<a id="idp17098752"></a>
<h2>See Also</h2>
<p>
<a class="link" href="cpstmid.html" title="cpstmid"><em class="citetitle">cpstmid</em></a>,
<a class="link" href="cpstun.html" title="cpstun"><em class="citetitle">cpstun</em></a>,
<a class="link" href="GEN02.html" title="GEN02"><em class="citetitle">GEN02</em></a>
</p>
</div>
<div class="refsect1" title="Credits">
<a id="idp17100800"></a>
<h2>Credits</h2>
<p>Written by Gabriel Maldonado.</p>
<p>Example written by Kevin Conder.</p>
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