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<div class="refentry" title="phasor">
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<h2>
<span class="refentrytitle">phasor</span>
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<p>phasor —
Produce a normalized moving phase value.
</p>
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<div class="refsect1" title="Description">
<a id="id3101078"></a>
<h2>Description</h2>
<p>
Produce a normalized moving phase value.
</p>
</div>
<div class="refsect1" title="Syntax">
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<h2>Syntax</h2>
<pre class="synopsis">ares <span class="command"><strong>phasor</strong></span> xcps [, iphs]</pre>
<pre class="synopsis">kres <span class="command"><strong>phasor</strong></span> kcps [, iphs]</pre>
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<div class="refsect1" title="Initialization">
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<h2>Initialization</h2>
<p>
<span class="emphasis"><em>iphs</em></span> (optional) -- initial phase, expressed as a fraction of a cycle (0 to 1). A negative value will cause phase initialization to be skipped. The default value is zero.
</p>
</div>
<div class="refsect1" title="Performance">
<a id="id3101704"></a>
<h2>Performance</h2>
<p>
An internal phase is successively accumulated in accordance with the <span class="emphasis"><em>kcps</em></span> or <span class="emphasis"><em>xcps</em></span> frequency to produce a moving phase value, normalized to lie in the range 0 <= phs < 1.
</p>
<p>
When used as the index to a <a class="link" href="table.html" title="table"><em class="citetitle">table</em></a> unit, this phase (multiplied by the desired function table length) will cause it to behave like an oscillator.
</p>
<p>
Note that <span class="emphasis"><em>phasor</em></span> is a special kind of integrator, accumulating phase increments that represent frequency settings.
</p>
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<div class="refsect1" title="Examples">
<a id="id3101748"></a>
<h2>Examples</h2>
<p>
Here is an example of the phasor opcode. It uses the file <a class="ulink" href="examples/phasor.csd" target="_top"><em class="citetitle">phasor.csd</em></a>.
</p>
<div class="example">
<a id="id3101765"></a>
<p class="title">
<b>Example 435. Example of the phasor 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 phasor.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.</span>
<span class="oblock">instr</span> 1
<span class="comment">; Create an index that repeats once per second.</span>
kcps <span class="opc">init</span> 1
kndx <span class="opc">phasor</span> kcps
<span class="comment">; Read Table #1 with our index.</span>
ifn <span class="op">=</span> 1
ixmode <span class="op">=</span> 1
kfreq <span class="opc">table</span> kndx, ifn, ixmode
<span class="comment">; Generate a sine waveform, use our table values </span>
<span class="comment">; to vary its frequency.</span>
a1 <span class="opc">oscil</span> 20000, kfreq, 2
<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 line from 200 to 2,000.</span>
<span class="stamnt">f</span> 1 0 1025 -7 200 1024 2000
<span class="comment">; Table #2, a sine wave.</span>
<span class="stamnt">f</span> 2 0 16384 10 1
<span class="comment">; Play Instrument #1 for 2 seconds.</span>
<span class="stamnt">i</span> 1 0 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" />
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<div class="refsect1" title="See also">
<a id="id3101802"></a>
<h2>See also</h2>
<p>
The <a class="link" href="SiggenTableacc.html" title="Table Access"><em class="citetitle">Table Access</em></a> opcodes like: <a class="link" href="table.html" title="table"><em class="citetitle">table</em></a>, <a class="link" href="tablei.html" title="tablei"><em class="citetitle">tablei</em></a>, <a class="link" href="table3.html" title="table3"><em class="citetitle">table3</em></a> and <a class="link" href="tab.html" title="tab"><em class="citetitle">tab</em></a>.
</p>
<p>
Also: <a class="link" href="phasorbnk.html" title="phasorbnk"><em class="citetitle">phasorbnk</em></a>.
</p>
</div>
<div class="refsect1" title="Credits">
<a id="id3101863"></a>
<h2>Credits</h2>
<p>Example written by Kevin Conder.</p>
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