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<h2>
<span class="refentrytitle">oscil3</span>
</h2>
<p>oscil3 —
A simple oscillator with cubic interpolation.
</p>
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<div class="refsect1" title="Description">
<a id="id3062445"></a>
<h2>Description</h2>
<p>
<span class="emphasis"><em>oscil3</em></span> reads table <span class="emphasis"><em>ifn</em></span> sequentially and repeatedly at a frequency <span class="emphasis"><em>xcps</em></span>. The amplitude is scaled by <span class="emphasis"><em>xamp</em></span>. Cubic interpolation is applied for table look up from internal phase values.
</p>
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<div class="refsect1" title="Syntax">
<a id="id3062478"></a>
<h2>Syntax</h2>
<pre class="synopsis">ares <span class="command"><strong>oscil3</strong></span> xamp, xcps, ifn [, iphs]</pre>
<pre class="synopsis">kres <span class="command"><strong>oscil3</strong></span> kamp, kcps, ifn [, iphs]</pre>
</div>
<div class="refsect1" title="Initialization">
<a id="id3063365"></a>
<h2>Initialization</h2>
<p>
<span class="emphasis"><em>ifn</em></span> -- function table number. Requires a wrap-around guard point.
</p>
<p>
<span class="emphasis"><em>iphs</em></span> (optional) -- initial phase of sampling, expressed as a fraction of a cycle (0 to 1). A negative value will cause phase initialization to be skipped. The default value is 0.
</p>
</div>
<div class="refsect1" title="Performance">
<a id="id3063389"></a>
<h2>Performance</h2>
<p>
<span class="emphasis"><em>kamp, xamp</em></span> -- amplitude
</p>
<p>
<span class="emphasis"><em>kcps, xcps</em></span> -- frequency in cycles per second.
</p>
<p>
<span class="emphasis"><em>oscil3</em></span> is identical to <a class="link" href="oscili.html" title="oscili"><em class="citetitle">oscili</em></a>, except that it uses cubic interpolation.
</p>
<p>
Table <span class="emphasis"><em>ifn</em></span> is incrementally sampled modulo the table length and the value obtained is multiplied by <span class="emphasis"><em>amp</em></span>.
</p>
<p>
If you need to change the oscillator table with a k-rate signal, you can use <a class="link" href="oscilikt.html" title="oscilikt"><em class="citetitle">oscilikt</em></a>.
</p>
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<div class="refsect1" title="Examples">
<a id="id3063450"></a>
<h2>Examples</h2>
<p>
Here is an example of the oscil3 opcode. It uses the file <a class="ulink" href="examples/oscil3.csd" target="_top"><em class="citetitle">oscil3.csd</em></a>.
</p>
<div class="example">
<a id="id3063467"></a>
<p class="title">
<b>Example 404. Example of the oscil3 opcode.</b>
</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 No messages</span>
-odac -iadc -d <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 oscil3.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">; Instrument #1 - a basic oscillator.</span>
<span class="oblock">instr</span> 1
kamp <span class="op">=</span> 10000
kcps <span class="op">=</span> 220
ifn <span class="op">=</span> 1
a1 <span class="opc">oscil</span> kamp, kcps, ifn
<span class="opc">out</span> a1
<span class="oblock">endin</span>
<span class="comment">; Instrument #2 - the basic oscillator with cubic interpolation.</span>
<span class="oblock">instr</span> 2
kamp <span class="op">=</span> 10000
kcps <span class="op">=</span> 220
ifn <span class="op">=</span> 1
a1 <span class="opc">oscil3</span> kamp, kcps, ifn
<span class="opc">out</span> a1
<span class="oblock">endin</span>
<span class="csdtag"></CsInstruments></span>
<span class="csdtag"><CsScore></span>
<span class="comment">; Table #1, a sine wave table with a small amount of data.</span>
<span class="stamnt">f</span> 1 0 32 10 0 1
<span class="comment">; Play Instrument #1, the basic oscillator, for </span>
<span class="comment">; two seconds. This should sound relatively rough.</span>
<span class="stamnt">i</span> 1 0 2
<span class="comment">; Play Instrument #2, the cubic interpolated oscillator, for</span>
<span class="comment">; two seconds. This should sound relatively smooth.</span>
<span class="stamnt">i</span> 2 2 2
<span class="stamnt">e</span>
<span class="csdtag"></CsScore></span>
<span class="csdtag"></CsoundSynthesizer></span>
</pre>
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<p><br class="example-break" />
</p>
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<div class="refsect1" title="See Also">
<a id="id3063504"></a>
<h2>See Also</h2>
<p>
<a class="link" href="oscil.html" title="oscil"><em class="citetitle">oscil</em></a>,
<a class="link" href="oscili.html" title="oscili"><em class="citetitle">oscili</em></a>,
<a class="link" href="oscilikt.html" title="oscilikt"><em class="citetitle">oscilikt</em></a>
</p>
</div>
<div class="refsect1" title="Credits">
<a id="id3063537"></a>
<h2>Credits</h2>
<p>Author: John ffitch</p>
<p>Example written by Kevin Conder.</p>
<p>New in Csound version 3.50</p>
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