<?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>pvsbandp</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="pvsarp.html" title="pvsarp" /> <link rel="next" href="pvsbandr.html" title="pvsbandr" /> </head> <body> <div class="navheader"> <table width="100%" summary="Navigation header"> <tr> <th colspan="3" align="center">pvsbandp</th> </tr> <tr> <td width="20%" align="left"><a accesskey="p" href="pvsarp.html">Prev</a> </td> <th width="60%" align="center">Orchestra Opcodes and Operators</th> <td width="20%" align="right"> <a accesskey="n" href="pvsbandr.html">Next</a></td> </tr> </table> <hr /> </div> <div class="refentry"> <a id="pvsbandp"></a> <div class="titlepage"></div> <a id="IndexPvsbandp" class="indexterm"></a> <div class="refnamediv"> <h2> <span class="refentrytitle">pvsbandp</span> </h2> <p>pvsbandp — A band pass filter working in the spectral domain. </p> </div> <div class="refsect1"> <a id="idm281472900163592"></a> <h2>Description</h2> <p> Filter the pvoc frames, passing bins whose frequency is within a band, and with linear interpolation for transitional bands. </p> </div> <div class="refsect1"> <a id="idm281472900084072"></a> <h2>Syntax</h2> <pre class="synopsis">fsig <span class="command"><strong>pvsbandp</strong></span> fsigin, xlowcut, xlowfull, \ xhighfull, xhighcut[, ktype]</pre> </div> <div class="refsect1"> <a id="idm281472900081912"></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>xlowcut, xlowfull, xhighfull, xhighcut</em></span> -- define a trapezium shape for the band that is passed. The a-rate versions only apply to the sliding case. </p> <p> <span class="emphasis"><em>ktype</em></span> -- specifies the shape of the transitional band. If at the default value of zero the shape is as below, with linear transition in amplitude. Other values yield and exponential shape: </p> <div class="literallayout"> <p><br /> (1 - exp( r*type )) / (1 - exp(type))<br /> </p> </div> <p> This includes a linear dB shape when <span class="emphasis"><em>ktype</em></span> is <span class="emphasis"><em>log</em></span>(10) or about 2.30. </p> <p> The opcode performs a band-pass filter with a spectral envelope shaped like </p> <div class="literallayout"> <p><br /> klowfull __________________________ khighfull<br /> / \<br /> / \<br /> / \<br /> / \<br /> / \<br /> ________/ \______________<br /> klowcut khighcut<br /> </p> </div> <p> </p> </div> <div class="refsect1"> <a id="idm281472900073672"></a> <h2>Examples</h2> <p> Here is an example of the pvsbandp opcode. It uses the file <a class="ulink" href="examples/pvsbandp.csd" target="_top"><em class="citetitle">pvsbandp.csd</em></a>. </p> <div class="example"> <a id="idm281472900071816"></a> <p class="title"> <strong>Example 741. Example of the pvsbandp 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="idm281472721201624"></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> <span class="c1">; Audio out Audio in</span> -odac <span class="c1">;;;RT audio I/O</span> <span class="c1">; For Non-realtime ouput leave only the line below:</span> <span class="c1">; -o pvsbandp.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">16</span> <span class="vg">nchnls</span> <span class="o">=</span> <span class="mi">1</span> <span class="vg">0dbfs</span> <span class="o">=</span> <span class="mi">1</span> <span class="c1">;; example written by joachim heintz 2009</span> <span class="kd">instr</span> <span class="nf">1</span> S<span class="n">file</span> <span class="o">=</span> <span class="s">"fox.wav"</span> k<span class="n">lowcut</span> <span class="o">=</span> <span class="mi">100</span> k<span class="n">lowfull</span> <span class="o">=</span> <span class="mi">200</span> k<span class="n">highfull</span> <span class="o">=</span> <span class="mi">1900</span> k<span class="n">highcut</span> <span class="o">=</span> <span class="mi">2000</span> a<span class="n">in</span> <span class="nb">soundin</span> S<span class="n">file</span> <span class="n">fftin</span> <span class="nb">pvsanal</span> a<span class="n">in</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">; fft-analysis of the audio-signal</span> <span class="n">fftbp</span> <span class="nb">pvsbandp</span> <span class="n">fftin</span><span class="p">,</span> k<span class="n">lowcut</span><span class="p">,</span> k<span class="n">lowfull</span><span class="p">,</span> k<span class="n">highfull</span><span class="p">,</span> k<span class="n">highcut</span> <span class="c1">; band pass</span> a<span class="n">bp</span> <span class="nb">pvsynth</span> <span class="n">fftbp</span><span class="c1">; resynthesis</span> <span class="nb">out</span> a<span class="n">bp</span> <span class="kd">endin</span> <span class="nt"></CsInstruments></span> <span class="nt"><CsScore></span> <span class="nb">i</span> <span class="mi">1</span> <span class="mi">0</span> <span class="mi">3</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> </div> <div class="refsect1"> <a id="idm281472900067624"></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>, <a class="link" href="pvsbandr.html" title="pvsbandr"><em class="citetitle">pvsbandr</em></a> </p> </div> <div class="refsect1"> <a id="idm281472900062696"></a> <h2>Credits</h2> <p> </p> <table border="0" summary="Simple list" class="simplelist"> <tr> <td>Author: John ffitch</td> </tr> <tr> <td>December 2007 </td> </tr> </table> <p> </p> </div> </div> <div class="navfooter"> <hr /> <table width="100%" summary="Navigation footer"> <tr> <td width="40%" align="left"><a accesskey="p" href="pvsarp.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="pvsbandr.html">Next</a></td> </tr> <tr> <td width="40%" align="left" valign="top">pvsarp </td> <td width="20%" align="center"> <a accesskey="h" href="index.html">Home</a> </td> <td width="40%" align="right" valign="top"> pvsbandr</td> </tr> </table> </div> </body> </html>