<?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" type="text/css" href="csound.css" /> <link rel="stylesheet" type="text/css" href="syntax-highlighting.css" /> <meta name="generator" content="DocBook XSL Stylesheets Vsnapshot" /> <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="pvs2tab.html" title="pvs2tab" /> </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="pvs2tab.html">Next</a></td> </tr> </table> <hr /> </div> <div class="refentry"> <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"> <a id="idm281472897684424"></a> <h2>Description</h2> <p> Warp the spectral envelope of a PVS signal by means of shifting and scaling. </p> </div> <div class="refsect1"> <a id="idm281472897683128"></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"> <a id="idm281472897641032"></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 (in Hz), values > 0 shift the envelope linearly upwards and values < 0 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" 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"> <a id="idm281472897632104"></a> <h2>Examples</h2> <p> Here is an example of the pvswarp opcode. It uses the file <a class="ulink" href="examples/pvswarp.csd" target="_top"><em class="citetitle">pvswarp.csd</em></a>. </p> <div class="example"> <a id="idm281472897630248"></a> <p class="title"> <strong>Example 786. Example of the pvswarp 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="idm281472718522392"></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 realtime audio input is needed too</span> <span class="c1">; For Non-realtime ouput leave only the line below:</span> <span class="c1">; -o pvswarp.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="kd">instr</span> <span class="nf">1</span> k<span class="n">scal</span> <span class="o">=</span> <span class="nb">p4</span> k<span class="n">shift</span> <span class="o">=</span> <span class="nb">p5</span> a<span class="n">sig</span> <span class="nb">soundin</span> <span class="s">"fox.wav"</span> <span class="c1">; get the signal in</span> <span class="n">fsig</span> <span class="nb">pvsanal</span> a<span class="n">sig</span><span class="p">,</span> <span class="mi">1024</span><span class="p">,</span> <span class="mi">256</span><span class="p">,</span> <span class="mi">1024</span><span class="p">,</span> <span class="mi">1</span> <span class="c1">; analyse it</span> <span class="n">ftps</span> <span class="nb">pvswarp</span> <span class="n">fsig</span><span class="p">,</span> k<span class="n">scal</span><span class="p">,</span> k<span class="n">shift</span> <span class="c1">; warp it</span> a<span class="n">tps</span> <span class="nb">pvsynth</span> <span class="n">ftps</span> <span class="c1">; synthesise it </span> <span class="nb">outs</span> a<span class="n">tps</span><span class="o">/</span><span class="mi">2</span><span class="p">,</span> a<span class="n">tps</span><span class="o">/</span><span class="mi">2</span> <span class="kd">endin</span> <span class="nt"></CsInstruments></span> <span class="nt"><CsScore></span> <span class="c1">;change scale</span> <span class="nb">i</span> <span class="mi">1</span> <span class="mi">0</span> <span class="mi">3</span> <span class="mi">1</span> <span class="nb">i</span> <span class="mi">1</span> <span class="o">+</span> <span class="o">.</span> <span class="mf">1.5</span> <span class="nb">i</span> <span class="mi">1</span> <span class="o">+</span> <span class="o">.</span> <span class="mi">3</span> <span class="nb">i</span> <span class="mi">1</span> <span class="o">+</span> <span class="o">.</span> <span class="mf">.25</span> <span class="c1">;change shift</span> <span class="nb">i</span> <span class="mi">1</span> <span class="o">+</span> <span class="o">.</span> <span class="mi">1</span> <span class="mi">0</span> <span class="nb">i</span> <span class="mi">1</span> <span class="o">+</span> <span class="o">.</span> <span class="o">.</span> <span class="mi">300</span> <span class="nb">i</span> <span class="mi">1</span> <span class="o">+</span> <span class="o">.</span> <span class="o">.</span> <span class="mi">0</span> <span class="nb">i</span> <span class="mi">1</span> <span class="o">+</span> <span class="o">.</span> <span class="o">.</span> <span class="o">-</span><span class="mi">300</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> <p>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> </div> <div class="refsect1"> <a id="idm281472897625400"></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"> <a id="idm281472897621432"></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="pvs2tab.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"> pvs2tab</td> </tr> </table> </div> </body> </html>