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<div class="refentry" title="vco2ift">
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<h2>
<span class="refentrytitle">vco2ift</span>
</h2>
<p>vco2ift —
Returns a table number at i-time for a given oscillator frequency and wavform.
</p>
</div>
<div class="refsect1" title="Description">
<a id="idp50981016"></a>
<h2>Description</h2>
<p>
<span class="emphasis"><em>vco2ift</em></span> is the same as <a class="link" href="vco2ft.html" title="vco2ft"><em class="citetitle">vco2ft</em></a>, but works at i-time. It is suitable for use with opcodes that expect an i-rate table number (for example, <a class="link" href="oscili.html" title="oscili"><em class="citetitle">oscili</em></a>).
</p>
</div>
<div class="refsect1" title="Syntax">
<a id="idp50992320"></a>
<h2>Syntax</h2>
<pre class="synopsis">ifn <span class="command"><strong>vco2ift</strong></span> icps, iwave [, inyx]</pre>
</div>
<div class="refsect1" title="Initialization">
<a id="idp50993448"></a>
<h2>Initialization</h2>
<p>
<span class="emphasis"><em>ifn</em></span> -- the ftable number.
</p>
<p>
<span class="emphasis"><em>icps</em></span> -- frequency in Hz. Zero and negative values are allowed. However, if the absolute value exceeds <a class="link" href="sr.html" title="sr"><em class="citetitle">sr</em></a>/2 (or <span class="emphasis"><em>sr</em></span> * <span class="emphasis"><em>inyx</em></span>), the selected table will contain silence.
</p>
<p>
<span class="emphasis"><em>iwave</em></span> -- the waveform for which table number is to be selected. Allowed values are:
</p>
<div class="itemizedlist">
<ul class="itemizedlist" type="disc">
<li class="listitem">
<p>0: sawtooth</p>
</li>
<li class="listitem">
<p>1: 4 * x * (1 - x) (integrated sawtooth)</p>
</li>
<li class="listitem">
<p>2: pulse (not normalized)</p>
</li>
<li class="listitem">
<p>3: square wave</p>
</li>
<li class="listitem">
<p>4: triangle</p>
</li>
</ul>
</div>
<p>
</p>
<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>
</div>
<div class="refsect1" title="Examples">
<a id="idp51049608"></a>
<h2>Examples</h2>
<p>
Here is an example of the vco2ift opcode. It uses the file <a class="ulink" href="examples/vco2ift.csd" target="_top"><em class="citetitle">vco2ift.csd</em></a>.
</p>
<div class="example">
<a id="idp51050584"></a>
<p class="title">
<strong>Example 931. Example of the vco2ift 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>
-odac <span class="comment">;;;realtime audio out</span>
<span class="comment">;-iadc ;;;uncomment -iadc if realtime audio input is needed too</span>
<span class="comment">; For Non-realtime ouput leave only the line below:</span>
<span class="comment">; -o vco2ift.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="comment">; user defined waveform -2: fixed table size (64), number of partials</span>
<span class="comment">; multiplier is 1.4</span>
itmp <span class="ohdr">ftgen</span> 2, 0, 64, 5, 1, 2, 120, 60, 1, 1, 0.001, 1
ift <span class="opc">vco2init</span> <span class="op">-</span>2, 2, 1.4, 4096, 4096, 2
<span class="oblock">instr</span> 1
icps <span class="op">=</span> p4
ifn <span class="opc">vco2ift</span> icps, <span class="op">-</span>2, 0.5 <span class="comment">;with user defined waveform</span>
<span class="opc">print</span> ifn
asig <span class="opc">oscili</span> 1, 220, ifn <span class="comment">; (-2), and sr/2 bandwidth</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 2 20
<span class="stamnt">i</span> 1 3 2 2000
<span class="stamnt">i</span> 1 6 2 20000
<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 a line like these:
</p>
<pre class="screen">
instr 1: ifn = 22.000
instr 1: ifn = 8.000
instr 1: ifn = 3.000
</pre>
<p>
</p>
<p>
See the example for the <a class="link" href="vco2.html" title="vco2"><em class="citetitle">vco2</em></a> opcode too.
</p>
</div>
<div class="refsect1" title="See Also">
<a id="idp51054024"></a>
<h2>See Also</h2>
<p>
<a class="link" href="vco2ft.html" title="vco2ft"><em class="citetitle">vco2ft</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>
</div>
<div class="refsect1" title="Credits">
<a id="idp51056064"></a>
<h2>Credits</h2>
<p>Author: Istvan Varga</p>
<p>New in version 4.22</p>
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