<?xml version="1.0" encoding="UTF-8" standalone="no"?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> <title>pvswarp</title> <link rel="stylesheet" href="csound.css" type="text/css" /> <meta name="generator" content="DocBook XSL Stylesheets V1.75.2" /> <link rel="home" href="index.html" title="The Canonical Csound Reference Manual" /> <link rel="up" href="OpcodesTop.html" title="Orchestra Opcodes and Operators" /> <link rel="prev" href="pvsynth.html" title="pvsynth" /> <link rel="next" href="pyassign.html" title="pyassign Opcodes" /> </head> <body> <div class="navheader"> <table width="100%" summary="Navigation header"> <tr> <th colspan="3" align="center">pvswarp</th> </tr> <tr> <td width="20%" align="left"><a accesskey="p" href="pvsynth.html">Prev</a> </td> <th width="60%" align="center">Orchestra Opcodes and Operators</th> <td width="20%" align="right"> <a accesskey="n" href="pyassign.html">Next</a></td> </tr> </table> <hr /> </div> <div class="refentry" title="pvswarp"> <a id="pvswarp"></a> <div class="titlepage"></div> <a id="Indexpvswarp" class="indexterm"></a> <div class="refnamediv"> <h2> <span class="refentrytitle">pvswarp</span> </h2> <p>pvswarp — Warp the spectral envelope of a PVS signal </p> </div> <div class="refsect1" title="Description"> <a id="id3144558"></a> <h2>Description</h2> <p> Warp the spectral envelope of a PVS signal by means of shifting and scaling. </p> </div> <div class="refsect1" title="Syntax"> <a id="id3144570"></a> <h2>Syntax</h2> <pre class="synopsis">fsig <span class="command"><strong>pvswarp</strong></span> fsigin, kscal, kshift[, klowest, kmeth, kgain, kcoefs]</pre> </div> <div class="refsect1" title="Performance"> <a id="id3145501"></a> <h2>Performance</h2> <p> <span class="emphasis"><em>fsig</em></span> -- output pv stream </p> <p> <span class="emphasis"><em>fsigin</em></span> -- input pv stream </p> <p> <span class="emphasis"><em>kscal</em></span> -- spectral envelope scaling ratio. Values > 1 stretch the envelope and < 1 compress it. </p> <p> <span class="emphasis"><em>kshift</em></span> -- spectral envelope shift, values > 0 shift the envelope linearly upwards and values < 1 shift it downwards. </p> <p> <span class="emphasis"><em>klowest</em></span> -- lowest frequency shifted (affects only kshift, defaults to 0). </p> <p> <span class="emphasis"><em>kmethod</em></span> -- spectral envelope extraction method 1: liftered cepstrum method; 2: true envelope method (defaults to 1). </p> <p> <span class="emphasis"><em>kgain</em></span> -- amplitude scaling (defaults to 1). </p> <p> <span class="emphasis"><em>kcoefs</em></span> -- number of cepstrum coefs used in formant preservation (defaults to 80). </p> <div class="warning" title="Warning" style="margin-left: 0.5in; margin-right: 0.5in;"> <table border="0" summary="Warning"> <tr> <td rowspan="2" align="center" valign="top" width="25"> <img alt="[Warning]" src="images/warning.png" /> </td> <th align="left">Warning</th> </tr> <tr> <td align="left" valign="top"> <p> It is unsafe to use the same f-variable for both input and output of pvs opcodes. Using the same one might lead to undefined behavior on some opcodes. Use a different one on the left and right sides of the opcode. </p> </td> </tr> </table> </div> </div> <div class="refsect1" title="Examples"> <a id="id3145585"></a> <h2>Examples</h2> <p> </p> <div class="example"> <a id="id3145593"></a> <p class="title"> <b>Example 500. Example</b> </p> <div class="example-contents"> <pre class="programlisting"> asig in ; get the signal in fsig pvsanal asig, 1024, 256, 1024, 1 ; analyse it ftps pvswarp fsig, 1.5, 0 ; warp it atps pvsynth ftps ; synthesise it out atps </pre> </div> </div> <p><br class="example-break" /> </p> <p> The example above shows a spectral envelope warper, scaling the freq envelope by 1.5. Used with vocal sounds, it will shift the formants and result in a changed vowel timbre, similar to the effect of a singer inhaling helium (the 'donald duck' effect). </p> <p> Here is an example of the use of the <span class="emphasis"><em>pvswarp</em></span> opcode. It uses the file <a class="ulink" href="examples/pvswarp.csd" target="_top"><em class="citetitle">pvswarp.csd</em></a>. </p> </div> <div class="refsect1" title="See Also"> <a id="id3145636"></a> <h2>See Also</h2> <p> <a class="link" href="pvsanal.html" title="pvsanal"><em class="citetitle">pvsanal</em></a>, <a class="link" href="pvsynth.html" title="pvsynth"><em class="citetitle">pvsynth</em></a>, <a class="link" href="pvsadsyn.html" title="pvsadsyn"><em class="citetitle">pvsadsyn</em></a> </p> </div> <div class="refsect1" title="Credits"> <a id="id3145679"></a> <h2>Credits</h2> <p> </p> <table border="0" summary="Simple list" class="simplelist"> <tr> <td>Author: Victor Lazzarini</td> </tr> <tr> <td>November 2004 </td> </tr> </table> <p> </p> <p>New plugin in version 5</p> <p>November 2004.</p> </div> </div> <div class="navfooter"> <hr /> <table width="100%" summary="Navigation footer"> <tr> <td width="40%" align="left"><a accesskey="p" href="pvsynth.html">Prev</a> </td> <td width="20%" align="center"> <a accesskey="u" href="OpcodesTop.html">Up</a> </td> <td width="40%" align="right"> <a accesskey="n" href="pyassign.html">Next</a></td> </tr> <tr> <td width="40%" align="left" valign="top">pvsynth </td> <td width="20%" align="center"> <a accesskey="h" href="index.html">Home</a> </td> <td width="40%" align="right" valign="top"> pyassign Opcodes</td> </tr> </table> </div> </body> </html>