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<h2>
<span class="refentrytitle">pvread</span>
</h2>
<p>pvread —
Reads from a phase vocoder analysis file and returns the frequency and amplitude from a single analysis channel or bin.
</p>
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<div class="refsect1" title="Description">
<a id="idp37993712"></a>
<h2>Description</h2>
<p>
<span class="emphasis"><em>pvread</em></span> reads from a <a class="link" href="pvoc.html" title="pvoc"><em class="citetitle">pvoc</em></a> file and returns the frequency and amplitude from a single analysis channel or bin. The returned values can be used anywhere else in the Csound instrument. For example, one can use them as arguments to an oscillator to synthesize a single component from an analyzed signal or a bank of <span class="emphasis"><em>pvreads</em></span> can be used to resynthesize the analyzed sound using additive synthesis by passing the frequency and magnitude values to a bank of oscillators.
</p>
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<div class="refsect1" title="Syntax">
<a id="idp37997832"></a>
<h2>Syntax</h2>
<pre class="synopsis">kfreq, kamp <span class="command"><strong>pvread</strong></span> ktimpnt, ifile, ibin</pre>
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<div class="refsect1" title="Initialization">
<a id="idp37998968"></a>
<h2>Initialization</h2>
<p>
<span class="emphasis"><em>ifile</em></span> -- the <span class="emphasis"><em>pvoc</em></span> number (n in pvoc.n) or the name in quotes of the analysis file made using <span class="emphasis"><em>pvanal</em></span>. (See <a class="link" href="pvoc.html" title="pvoc"><em class="citetitle">pvoc</em></a>.)
</p>
<p>
<span class="emphasis"><em>ibin</em></span> -- the number of the analysis channel from which to return frequency in Hz and magnitude.
</p>
</div>
<div class="refsect1" title="Performance">
<a id="idp38001296"></a>
<h2>Performance</h2>
<p>
<span class="emphasis"><em>kfreq, kamp</em></span> -- outputs of the <span class="emphasis"><em>pvread</em></span> unit. These values, retrieved from a phase vocoder analysis file, represent the values of frequency and amplitude from a single analysis channel specified in the <span class="emphasis"><em>ibin</em></span> argument. Interpolation between analysis frames is performed at k-rate resolution and dependent of course upon the rate and direction of <span class="emphasis"><em>ktimpnt</em></span>.
</p>
<p>
<span class="emphasis"><em>ktimpnt</em></span> -- the passage of time, in seconds, through this file. <span class="emphasis"><em>ktimpnt</em></span> must always be positive, but can move forwards or backwards in time, be stationary or discontinuous, as a pointer into the analysis file.
</p>
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<div class="refsect1" title="Examples">
<a id="idp38064960"></a>
<h2>Examples</h2>
<p>
The example below shows the use <span class="emphasis"><em>pvread</em></span> to synthesize a single component at a time from a phase vocoder analysis file. It should be noted that the <span class="emphasis"><em>kfreq</em></span> and <span class="emphasis"><em>kamp</em></span> outputs can be used for any kind of synthesis, filtering, processing, and so on.
</p>
<div class="example">
<a id="idp38066328"></a>
<p class="title">
<strong>Example 633. Example of the pvread 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 pvread.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">0dbfs</span> <span class="op">=</span> 1
<span class="ohdr">nchnls</span> <span class="op">=</span> 2
<span class="oblock">instr</span> 1
<span class="comment">; analyze "fox.wav" with PVANAL first</span>
ibin <span class="op">=</span> p4
ktime <span class="opc">line</span> 0, p3, 2.8
kfreq, kamp <span class="opc">pvread</span> ktime, "fox.pvx", ibin <span class="comment">;read data from 7th analysis bin.</span>
asig <span class="opc">poscil</span> kamp, kfreq, 1 <span class="comment">;function 1 is a stored sine</span>
<span class="opc">outs</span> asig<span class="op">*</span>5, asig<span class="op">*</span>5 <span class="comment">;compensate loss of volume</span>
<span class="oblock">endin</span>
<span class="csdtag"></CsInstruments></span>
<span class="csdtag"><CsScore></span>
<span class="comment">;sine wave</span>
<span class="stamnt">f</span>1 0 4096 10 1
<span class="stamnt">i</span> 1 0 6 7
<span class="stamnt">i</span> 1 + 6 15
<span class="stamnt">i</span> 1 + 2 25
<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="idp38068600"></a>
<h2>See Also</h2>
<p>
<a class="link" href="pvbufread.html" title="pvbufread"><em class="citetitle">pvbufread</em></a>,
<a class="link" href="pvcross.html" title="pvcross"><em class="citetitle">pvcross</em></a>,
<a class="link" href="pvinterp.html" title="pvinterp"><em class="citetitle">pvinterp</em></a>,
<a class="link" href="tableseg.html" title="tableseg"><em class="citetitle">tableseg</em></a>,
<a class="link" href="tablexseg.html" title="tablexseg"><em class="citetitle">tablexseg</em></a>
</p>
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<div class="refsect1" title="Credits">
<a id="idp38071536"></a>
<h2>Credits</h2>
<p>
</p>
<table border="0" summary="Simple list" class="simplelist">
<tr>
<td>Author: Richard Karpen</td>
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<tr>
<td>Seattle, Wash</td>
</tr>
<tr>
<td>1997</td>
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<p>
</p>
<p>New in version 3.44</p>
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