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<div class="refentry">
<a id="poscil"></a>
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<a id="Indexposcil" class="indexterm"></a>
<div class="refnamediv">
<h2>
<span class="refentrytitle">poscil</span>
</h2>
<p>poscil —
High precision oscillator.
</p>
</div>
<div class="refsect1">
<a id="idm281472902536984"></a>
<h2>Description</h2>
<p>
High precision oscillator.
</p>
</div>
<div class="refsect1">
<a id="idm281472902535672"></a>
<h2>Syntax</h2>
<pre class="synopsis">ares <span class="command"><strong>poscil</strong></span> aamp, acps [, ifn, iphs]</pre>
<pre class="synopsis">ares <span class="command"><strong>poscil</strong></span> aamp, kcps [, ifn, iphs]</pre>
<pre class="synopsis">ares <span class="command"><strong>poscil</strong></span> kamp, acps [, ifn, iphs]</pre>
<pre class="synopsis">ares <span class="command"><strong>poscil</strong></span> kamp, kcps [, ifn, iphs]</pre>
<pre class="synopsis">ires <span class="command"><strong>poscil</strong></span> kamp, kcps [, ifn, iphs]</pre>
<pre class="synopsis">kres <span class="command"><strong>poscil</strong></span> kamp, kcps [, ifn, iphs]</pre>
</div>
<div class="refsect1">
<a id="idm281472902526136"></a>
<h2>Initialization</h2>
<p>
<span class="emphasis"><em>ifn</em></span> -- (optional) function table number. This
defaults to -1 which indicates a sinewave.
</p>
<p>
<span class="emphasis"><em>iphs</em></span> (optional, default=0) -- initial phase
(normalized table index 0-1). If a negative value is given
initialisation of the phase is skipped.
</p>
</div>
<div class="refsect1">
<a id="idm281472902523272"></a>
<h2>Performance</h2>
<p>
<span class="emphasis"><em>ares</em></span> -- output signal
</p>
<p>
<span class="emphasis"><em>kamp</em></span>, <span class="emphasis"><em>aamp</em></span> -- the
amplitude of the output signal.
</p>
<p>
<span class="emphasis"><em>kcps</em></span>, <span class="emphasis"><em>acps</em></span> -- the
frequency of the output signal in cycles per second.
</p>
<p>
<span class="emphasis"><em>poscil</em></span> (precise oscillator) is the same as
<a class="link" href="oscili.html" title="oscili"><em class="citetitle">oscili</em></a>, but
allows much more precise frequency control, especially when
using long tables and low frequency values. It uses
floating-point table indexing, instead of integer math, like
<span class="emphasis"><em>oscil</em></span> and <span class="emphasis"><em>oscili</em></span>. It
is only a bit slower than <span class="emphasis"><em>oscili</em></span>.
</p>
<p>
Since Csound 4.22, <span class="emphasis"><em>poscil</em></span> can accept also
negative frequency values and use a-rate values both for
amplitude and frequency. So both AM and FM are allowed using
this opcode.
</p>
<p>The opcode <a class="link" href="poscil3.html" title="poscil3"><em class="citetitle">poscil3</em></a> is the
same as <span class="emphasis"><em>poscil</em></span>, but uses cubic
interpolation.</p>
<p>Note that <span class="emphasis"><em>poscil</em></span> can use deffered
(non-power of two) length tables.</p>
</div>
<div class="refsect1">
<a id="idm281472902511080"></a>
<h2>Examples</h2>
<p>
Here is an example of the poscil opcode. It uses the file <a class="ulink" href="examples/poscil.csd" target="_top"><em class="citetitle">poscil.csd</em></a>.
</p>
<div class="example">
<a id="idm281472902509304"></a>
<p class="title">
<strong>Example 710. Example of the poscil 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>
<div class="refsect1">
<a id="idm281472723276440"></a>
<pre class="programlisting">
<span class="nt"><CsoundSynthesizer></span>
<span class="nt"><CsOptions></span>
<span class="c1">; Select audio/midi flags here according to platform</span>
-odac <span class="c1">;;;realtime audio out</span>
<span class="c1">;-iadc ;;;uncomment -iadc if RT audio input is needed too</span>
<span class="c1">; For Non-realtime ouput leave only the line below:</span>
<span class="c1">; -o poscil.wav -W ;;; for file output any platform</span>
<span class="nt"></CsOptions></span>
<span class="nt"><CsInstruments></span>
<span class="vg">sr</span> <span class="o">=</span> <span class="mi">44100</span>
<span class="vg">ksmps</span> <span class="o">=</span> <span class="mi">32</span>
<span class="vg">nchnls</span> <span class="o">=</span> <span class="mi">2</span>
<span class="vg">0dbfs</span> <span class="o">=</span> <span class="mi">1</span>
<span class="nb">seed</span> <span class="mi">0</span>
gi<span class="n">sine</span> <span class="nb">ftgen</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">2</span><span class="o">^</span><span class="mi">10</span><span class="p">,</span> <span class="mi">10</span><span class="p">,</span> <span class="mi">1</span>
<span class="kd">instr</span> <span class="nf">1</span>
i<span class="n">peak</span> <span class="nb">random</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">1</span> <span class="c1">;where is the envelope peak</span>
a<span class="n">sig</span> <span class="nb">poscil</span> <span class="mf">.8</span><span class="p">,</span> <span class="mi">220</span><span class="p">,</span> gi<span class="n">sine</span>
a<span class="n">env</span> <span class="nb">transeg</span> <span class="mi">0</span><span class="p">,</span> <span class="nb">p3</span><span class="o">*</span>i<span class="n">peak</span><span class="p">,</span> <span class="mi">6</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="nb">p3</span><span class="o">-</span><span class="nb">p3</span><span class="o">*</span>i<span class="n">peak</span><span class="p">,</span> <span class="o">-</span><span class="mi">6</span><span class="p">,</span> <span class="mi">0</span>
a<span class="n">L</span><span class="p">,</span>a<span class="n">R</span> <span class="nb">pan2</span> a<span class="n">sig</span><span class="o">*</span>a<span class="n">env</span><span class="p">,</span> i<span class="n">peak</span> <span class="c1">;pan according to random value</span>
<span class="nb">outs</span> a<span class="n">L</span><span class="p">,</span> a<span class="n">R</span>
<span class="kd">endin</span>
<span class="nt"></CsInstruments></span>
<span class="nt"><CsScore></span>
<span class="nb">i</span><span class="mi">1</span> <span class="mi">0</span> <span class="mi">5</span>
<span class="nb">i</span><span class="mi">1</span> <span class="mi">4</span> <span class="mi">5</span>
<span class="nb">i</span><span class="mi">1</span> <span class="mi">8</span> <span class="mi">5</span>
<span class="nb">e</span>
<span class="nt"></CsScore></span>
<span class="nt"></CsoundSynthesizer></span>
</pre>
</div>
</div>
</div>
<p><br class="example-break" />
</p>
</div>
<div class="refsect1">
<a id="idm281472902504936"></a>
<h2>See Also</h2>
<p>
<a class="link" href="poscil3.html" title="poscil3"><em class="citetitle">poscil3</em></a>
</p>
</div>
<div class="refsect1">
<a id="idm281472902502792"></a>
<h2>Credits</h2>
<p>
</p>
<table border="0" summary="Simple list" class="simplelist">
<tr>
<td>Author: Gabriel Maldonado</td>
</tr>
<tr>
<td>Italy</td>
</tr>
<tr>
<td>1998</td>
</tr>
</table>
<p>
</p>
<p>November 2002. Added a note about the changes to Csound
version 4.22, thanks to Rasmus Ekman.</p>
<p>New in Csound version 3.52</p>
<p>Function table optional in Csound version 6.00</p>
<p>Skip of initialisation new in version 6.06</p>
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