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<refentry id="cpstuni">
<indexterm id="IndexCpstuni"><primary>cpstuni</primary></indexterm>
<refentryinfo><title>Pitch Converters:Tuning Opcodes</title></refentryinfo>
<refmeta>
<refentrytitle>cpstuni</refentrytitle>
</refmeta>
<refnamediv>
<refname>cpstuni</refname>
<refpurpose>
Returns micro-tuning values at init-rate.
</refpurpose>
</refnamediv>
<refsect1>
<title>Description</title>
<para>
Returns micro-tuning values at init-rate.
</para>
</refsect1>
<refsect1>
<title>Syntax</title>
<synopsis>icps <command>cpstuni</command> index, ifn</synopsis>
</refsect1>
<refsect1>
<title>Initialization</title>
<para>
<emphasis>icps</emphasis> -- Return value in cycles per second.
</para>
<para>
<emphasis>index</emphasis> -- An integer number denoting an index of scale.
</para>
<para>
<emphasis>ifn</emphasis> -- Function table containing the parameters (numgrades, interval, basefreq, basekeymidi) and the tuning ratios.
</para>
</refsect1>
<refsect1>
<title>Performance</title>
<para>
These opcodes are similar to <link linkend="cpstmid"><citetitle>cpstmid</citetitle></link>, but work without necessity of MIDI.
</para>
<para>
<emphasis>cpstuni</emphasis> 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.
</para>
<para>
The <emphasis>index</emphasis> argument should be filled with integer numbers expressing the grade of given scale to be converted in cps. The function table <emphasis>ifn</emphasis> should be generated by <link linkend="GEN02"><citetitle>GEN02</citetitle></link> and the first four values stored in this function are parameters that express:
<itemizedlist>
<listitem><para>numgrades -- The number of grades of the micro-tuning scale.</para></listitem>
<listitem><para>interval -- The frequency range covered before repeating the grade ratios, for example 2 for one octave, 1.5 for a fifth etcetera.</para></listitem>
<listitem><para>basefreq -- The base frequency of the scale in cycles per second.</para></listitem>
<listitem><para>basekey -- The integer index of the scale to which to assign basefreq unmodified.</para></listitem>
</itemizedlist>
</para>
<para>
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:
<informalexample>
<programlisting>
<emphasis role="comment">; numgrades basefreq tuning-ratios (eq.temp) .......</emphasis>
<emphasis role="comment">; interval basekey</emphasis>
<emphasis role="stamnt">f</emphasis>1 0 64 -2 12 2 261 60 1 1.059463 1.12246 1.18920 ..etc...</programlisting>
</informalexample>
</para>
<para>
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:
<informalexample>
<programlisting>
<emphasis role="comment">; numgrades basefreq tuning-ratios .......</emphasis>
<emphasis role="comment">; interval basekey</emphasis>
<emphasis role="stamnt">f</emphasis>1 0 64 -2 24 1.5 440 48 1 1.01 1.02 1.03 ..etc...</programlisting>
</informalexample>
</para>
</refsect1>
<refsect1>
<title>Examples</title>
<para>
Here is an example of the cpstuni opcode. It uses the file <ulink url="examples/cpstuni.csd"><citetitle>cpstuni.csd</citetitle></ulink>.
<example>
<title>Example of the cpstuni opcode.</title>
<para>See the sections <link linkend="UsingRealTime"><citetitle>Real-time Audio</citetitle></link> and <link linkend="CommandFlags"><citetitle>Command Line Flags</citetitle></link> for more information on using command line flags.</para>
<xi:include href="examples-xml/cpstuni.csd.xml" xmlns:xi="http://www.w3.org/2001/XInclude"/>
</example>
Its output should include lines like this:
<screen>instr 1: i1 = 440.110</screen>
</para>
</refsect1>
<refsect1>
<title>See Also</title>
<para>
<link linkend="cpstmid"><citetitle>cpstmid</citetitle></link>,
<link linkend="cpstun"><citetitle>cpstun</citetitle></link>,
<link linkend="GEN02"><citetitle>GEN02</citetitle></link>
</para>
</refsect1>
<refsect1>
<title>Credits</title>
<para>Written by &namegabriel;.</para>
<para>Example written by &namekevin;.</para>
</refsect1>
</refentry>
|
