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<h2>
<span class="refentrytitle">vco2ft</span>
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<p>vco2ft —
Returns a table number at k-time for a given oscillator frequency and wavform.
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<div class="refsect1" title="Description">
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<h2>Description</h2>
<p>
<span class="emphasis"><em>vco2ft</em></span> returns the function table number to be used for generating the specified waveform at a given frequency. This function table number can be used by any Csound opcode that generates a signal by reading function tables (like <a class="link" href="oscilikt.html" title="oscilikt"><em class="citetitle">oscilikt</em></a>). The tables must be calculated by <a class="link" href="vco2init.html" title="vco2init"><em class="citetitle">vco2init</em></a> before <span class="emphasis"><em>vco2ft</em></span> is called and shared as Csound ftables (<span class="emphasis"><em>ibasfn</em></span>).
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<div class="refsect1" title="Syntax">
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<h2>Syntax</h2>
<pre class="synopsis">kfn <span class="command"><strong>vco2ft</strong></span> kcps, iwave [, inyx]</pre>
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<div class="refsect1" title="Initialization">
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<h2>Initialization</h2>
<p>
<span class="emphasis"><em>iwave</em></span> -- the waveform for which table number is to be selected. Allowed values are:
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<p>0: sawtooth</p>
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<p>1: 4 * x * (1 - x) (integrated sawtooth)</p>
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<p>2: pulse (not normalized)</p>
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<p>3: square wave</p>
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<p>4: triangle</p>
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<p>
Additionally, negative <span class="emphasis"><em>iwave</em></span> values select user defined waveforms (see also <a class="link" href="vco2init.html" title="vco2init"><em class="citetitle">vco2init</em></a>).
</p>
<p>
<span class="emphasis"><em>inyx</em></span> (optional, default=0.5) -- bandwidth of the generated waveform, as percentage (0 to 1) of the sample rate. The expected range is 0 to 0.5 (i.e. up to <a class="link" href="sr.html" title="sr"><em class="citetitle">sr</em></a>/2), other values are limited to the allowed range.
</p>
<p>
Setting <span class="emphasis"><em>inyx</em></span> to 0.25 (<span class="emphasis"><em>sr</em></span>/4), or 0.3333 (<span class="emphasis"><em>sr</em></span>/3) can produce a <span class="quote">“<span class="quote">fatter</span>”</span> sound in some cases, although it is more likely to reduce quality.
</p>
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<div class="refsect1" title="Performance">
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<h2>Performance</h2>
<p>
<span class="emphasis"><em>kfn</em></span> -- the ftable number, returned at k-rate.
</p>
<p>
<span class="emphasis"><em>kcps</em></span> -- frequency in Hz, returned at k-rate. Zero and negative values are allowed. However, if the absolute value exceeds <span class="emphasis"><em>sr</em></span>/2 (or <span class="emphasis"><em>sr</em></span> * <span class="emphasis"><em>inyx</em></span>), the selected table will contain silence.
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<div class="refsect1" title="Examples">
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<h2>Examples</h2>
<p>
See the example for the <a class="link" href="vco2.html" title="vco2"><em class="citetitle">vco2</em></a> opcode.
</p>
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<div class="refsect1" title="See Also">
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<h2>See Also</h2>
<p>
<a class="link" href="vco2ift.html" title="vco2ift"><em class="citetitle">vco2ift</em></a>,
<a class="link" href="vco2init.html" title="vco2init"><em class="citetitle">vco2init</em></a>, and
<a class="link" href="vco2.html" title="vco2"><em class="citetitle">vco2</em></a>.
</p>
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<div class="refsect1" title="Credits">
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<h2>Credits</h2>
<p>Author: Istvan Varga</p>
<p>New in version 4.22</p>
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