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<div class="refentry" title="lphasor">
<a id="lphasor"></a>
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<a id="IndexLphasor" class="indexterm"></a>
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<h2>
<span class="refentrytitle">lphasor</span>
</h2>
<p>lphasor —
Generates a table index for sample playback
</p>
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<div class="refsect1" title="Description">
<a id="id3001549"></a>
<h2>Description</h2>
<p>
This opcode can be used to generate table index for sample playback (e.g. <a class="link" href="tablexkt.html" title="tablexkt">tablexkt</a>).
</p>
</div>
<div class="refsect1" title="Syntax">
<a id="id3001568"></a>
<h2>Syntax</h2>
<pre class="synopsis">ares <span class="command"><strong>lphasor</strong></span> xtrns [, ilps] [, ilpe] [, imode] [, istrt] [, istor]</pre>
</div>
<div class="refsect1" title="Initialization">
<a id="id3001587"></a>
<h2>Initialization</h2>
<p>
<span class="emphasis"><em>ilps</em></span> -- loop start.
</p>
<p>
<span class="emphasis"><em>ilpe</em></span> -- loop end (must be greater than <span class="emphasis"><em>ilps</em></span> to enable looping). The default value of <span class="emphasis"><em>ilps</em></span> and <span class="emphasis"><em>ilpe</em></span> is zero.
</p>
<p>
<span class="emphasis"><em>imode</em></span> (optional: default = 0) -- loop mode. Allowed values are:
</p>
<div class="itemizedlist">
<ul class="itemizedlist" type="disc">
<li class="listitem">
<p><span class="emphasis"><em>0:</em></span> no loop</p>
</li>
<li class="listitem">
<p><span class="emphasis"><em>1:</em></span> forward loop</p>
</li>
<li class="listitem">
<p><span class="emphasis"><em>2:</em></span> backward loop</p>
</li>
<li class="listitem">
<p><span class="emphasis"><em>3:</em></span> forward-backward loop</p>
</li>
</ul>
</div>
<p>
</p>
<p>
<span class="emphasis"><em>istrt</em></span> (optional: default = 0) -- The initial output value (phase). It must be less than <span class="emphasis"><em>ilpe</em></span> if looping is enabled, but is allowed to be greater than <span class="emphasis"><em>ilps</em></span> (i.e. you can start playback in the middle of the loop).
</p>
<p>
<span class="emphasis"><em>istor</em></span> (optional: default = 0) -- skip initialization if set to any non-zero value.
</p>
</div>
<div class="refsect1" title="Performance">
<a id="id3002341"></a>
<h2>Performance</h2>
<p>
<span class="emphasis"><em>ares</em></span> -- a raw table index in samples (same unit for loop points). Can be used as index with the table opcodes.
</p>
<p>
<span class="emphasis"><em>xtrns</em></span> -- transpose factor, expressed as a playback ratio. <span class="emphasis"><em>ares</em></span> is incremented by this value, and wraps around loop points. For example, 1.5 means a fifth above, 0.75 means fourth below. It is not allowed to be negative.
</p>
</div>
<div class="refsect1" title="Examples">
<a id="id3002375"></a>
<h2>Examples</h2>
<p>
Here is an example of the lphasor opcode. It uses the file <a class="ulink" href="examples/lphasor.csd" target="_top"><em class="citetitle">lphasor.csd</em></a>.
</p>
<div class="example">
<a id="id3002392"></a>
<p class="title">
<b>Example 351. Example of the lphasor 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</span>
-odac -iadc <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 lphashor.wav -W ;;; for file output any platform</span>
<span class="csdtag"></CsOptions></span>
<span class="csdtag"><CsInstruments></span>
<span class="comment">; Example by Jonathan Murphy Dec 2006</span>
<span class="ohdr">sr</span> <span class="op">=</span> 44100
<span class="ohdr">ksmps</span> <span class="op">=</span> 10
<span class="ohdr">nchnls</span> <span class="op">=</span> 1
<span class="oblock">instr</span> 1
ifn <span class="op">=</span> 1 <span class="comment">; table number</span>
ilen <span class="op">=</span> <span class="opc">nsamp</span>(ifn) <span class="comment">; return actual number of samples in table</span>
itrns <span class="op">=</span> 1 <span class="comment">; no transposition</span>
ilps <span class="op">=</span> 0 <span class="comment">; loop starts at index 0</span>
ilpe <span class="op">=</span> ilen <span class="comment">; ends at value returned by nsamp above</span>
imode <span class="op">=</span> 3 <span class="comment">; loop forwards & backwards</span>
istrt <span class="op">=</span> 10000 <span class="comment">; commence playback at index 10000 samples</span>
<span class="comment">; lphasor provides index into f1 </span>
alphs <span class="opc">lphasor</span> itrns, ilps, ilpe, imode, istrt
atab <span class="opc">tablei</span> alphs, ifn
<span class="comment">; amplify signal</span>
atab <span class="op">=</span> atab <span class="op">*</span> 10000
<span class="opc">out</span> atab
<span class="oblock">endin</span>
<span class="csdtag"></CsInstruments></span>
<span class="csdtag"><CsScore></span>
<span class="stamnt">f</span> 1 0 262144 1 "beats.wav" 0 4 1
<span class="stamnt">i</span>1 0 60
<span class="stamnt">e</span>
<span class="csdtag"></CsScore></span>
<span class="csdtag"></CsoundSynthesizer></span>
</pre>
</div>
</div>
<p><br class="example-break" />
</p>
</div>
<div class="refsect1" title="Credits">
<a id="id3002430"></a>
<h2>Credits</h2>
<p>
</p>
<table border="0" summary="Simple list" class="simplelist">
<tr>
<td>Author: Istvan Varga</td>
</tr>
<tr>
<td>January 2002</td>
</tr>
<tr>
<td>Example by: Jonathan Murphy</td>
</tr>
</table>
<p>
</p>
<p>New in version 4.18</p>
<p>Updated April 2002 and November 2002 by Istvan Varga</p>
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