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<div class="refentry" title="STKVoicForm">
<a id="STKVoicForm"></a>
<div class="titlepage"></div>
<a id="IndexStkvoicform" class="indexterm"></a>
<div class="refnamediv">
<h2>
<span class="refentrytitle">STKVoicForm</span>
</h2>
<p>STKVoicForm —
STKVoicForm is a four formant synthesis instrument.
</p>
</div>
<div class="refsect1" title="Description">
<a id="idp46115456"></a>
<h2>Description</h2>
<p>
STKVoicForm is a four formant synthesis instrument.
This instrument contains an excitation singing wavetable (looping wave with random and periodic vibrato, smoothing on frequency, etc.), excitation noise, and four sweepable complex resonances.
Measured formant data is included, and enough data is there to support either parallel or cascade synthesis. In the floating point case cascade synthesis is the most natural so that's what you'll find here.</p>
</div>
<div class="refsect1" title="Syntax">
<a id="idp46125872"></a>
<h2>Syntax</h2>
<pre class="synopsis">asignal <span class="command"><strong>STKVoicForm</strong></span> ifrequency, iamplitude, [kc1, kv1[, kc2, kv2[, kc3, kv3[, kc4, kv4[, kc5, kv5]]]]]</pre>
</div>
<div class="refsect1" title="Initialization">
<a id="idp46127032"></a>
<h2>Initialization</h2>
<p>
<span class="emphasis"><em>ifrequency</em></span> -- Frequency of note played, in Hertz.
</p>
<p>
<span class="emphasis"><em>iamplitude</em></span> -- Amplitude of note played (range 0-1).
</p>
</div>
<div class="refsect1" title="Performance">
<a id="idp46128328"></a>
<h2>Performance</h2>
<p>
<span class="emphasis"><em>kc1, kv1, kc2, kv2, kc3, kv3, kc4, kv4, kc5, kv5, kc6, kv6, kc7, kv7, kc8, kv8</em></span> -- Up to 8 optional k-rate controller pairs for the STK opcodes.
Each controller pair consists of a controller number (kc) followed by a controller value (kv). The 5 controller numbers and values that work for STKVoicForm are:
</p>
<div class="itemizedlist">
<ul class="itemizedlist" type="disc">
<li class="listitem">
<p><span class="emphasis"><em>kc, kv</em></span> -- 2, voiced/unvoiced mix.</p>
</li>
<li class="listitem">
<p><span class="emphasis"><em>kc, kv</em></span> -- 4, vowel/phoneme selection.</p>
</li>
<li class="listitem">
<p><span class="emphasis"><em>kc, kv</em></span> -- 11, speed of low-frequency oscillator.</p>
</li>
<li class="listitem">
<p><span class="emphasis"><em>kc, kv</em></span> -- 1, depth of low-frequency oscillator.</p>
</li>
<li class="listitem">
<p><span class="emphasis"><em>kc, kv</em></span> -- 128, loudness (spectral tilt).</p>
</li>
</ul>
</div>
<p>
</p>
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<div class="refsect1">
<a id="idp46160736"></a>
<div class="note" title="Note" style="margin-left: 0.5in; margin-right: 0.5in;">
<table border="0" summary="Note: Note">
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<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>
The code for this opcode is taken directly from the VoicForm class in the Synthesis Toolkit in C++ by Perry R. Cook and Gary P. Scavone. More on the STK classes can be found here:
<a class="ulink" href="https://ccrma.stanford.edu/software/stk/classes.html" target="_top"><em class="citetitle">https://ccrma.stanford.edu/software/stk/classes.html</em></a>
</p>
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<div class="refsect1" title="Examples">
<a id="idp46162208"></a>
<h2>Examples</h2>
<p>
Here is an example of the STKVoicForm opcode.
It uses the file <a class="ulink" href="examples/STKVoicForm.csd" target="_top"><em class="citetitle">STKVoicForm.csd</em></a>.
</p>
<div class="example">
<a id="idp46163216"></a>
<p class="title">
<strong>Example 822. Example of the STKVoicForm opcode.</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>
-odac <span class="comment">;;;RT audio out</span>
<span class="comment">;-iadc ;;;uncomment -iadc if RT audio input is needed too</span>
<span class="comment">; For Non-realtime ouput leave only the line below:</span>
<span class="comment">; -o STKVoicForm.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
ifrq <span class="op">=</span> p4
ksel <span class="opc">line</span> p5, p3, p6 <span class="comment">;Vowel/Phoneme Selection</span>
asig <span class="opc">STKVoicForm</span> <span class="opc">cpspch</span>(p4), 1, 2, 1, 4, ksel, 128, 100, 1, 10, 11, 100
asig <span class="op">=</span> asig <span class="op">*</span> .5 <span class="comment">;too loud</span>
<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 5 7.00 100 0
<span class="stamnt">i</span> 1 + 10 7.00 1 50
<span class="stamnt">e</span>
<span class="csdtag"></CsScore></span>
<span class="csdtag"></CsoundSynthesizer></span>
</pre>
</div>
</div>
<p><br class="example-break" />
</p>
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<div class="refsect1" title="Credits">
<a id="idp46164232"></a>
<h2>Credits</h2>
<p>
</p>
<table border="0" summary="Simple list" class="simplelist">
<tr>
<td>Author: Michael Gogins (after Perry Cook)</td>
</tr>
<tr>
<td>Irreducible Productions</td>
</tr>
<tr>
<td>New York, NY</td>
</tr>
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<p>
</p>
<p>New in Csound version 5.11</p>
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