<?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>resonxk</title> <link rel="stylesheet" type="text/css" href="csound.css" /> <meta name="generator" content="DocBook XSL Stylesheets V1.76.1" /> <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="resonx.html" title="resonx" /> <link rel="next" href="resony.html" title="resony" /> </head> <body> <div class="navheader"> <table width="100%" summary="Navigation header"> <tr> <th colspan="3" align="center">resonxk</th> </tr> <tr> <td width="20%" align="left"><a accesskey="p" href="resonx.html">Prev</a> </td> <th width="60%" align="center">Orchestra Opcodes and Operators</th> <td width="20%" align="right"> <a accesskey="n" href="resony.html">Next</a></td> </tr> </table> <hr /> </div> <div class="refentry" title="resonxk"> <a id="resonxk"></a> <div class="titlepage"></div> <a id="IndexResonxk" class="indexterm"></a> <div class="refnamediv"> <h2> <span class="refentrytitle">resonxk</span> </h2> <p>resonxk — Control signal resonant filter stack. </p> </div> <div class="refsect1" title="Description"> <a id="idp40619072"></a> <h2>Description</h2> <p> <span class="emphasis"><em>resonxk</em></span> is equivalent to a group of resonk filters, with the same arguments, serially connected. Using a stack of a larger number of filters allows a sharper cutoff. </p> </div> <div class="refsect1" title="Syntax"> <a id="idp40620040"></a> <h2>Syntax</h2> <pre class="synopsis">kres <span class="command"><strong>resonxk</strong></span> ksig, kcf, kbw[, inumlayer, iscl, istor]</pre> </div> <div class="refsect1" title="Initialization"> <a id="idp40630664"></a> <h2>Initialization</h2> <p> <span class="emphasis"><em>inumlayer</em></span> - number of elements of filter stack. Default value is 4. Maximum value is 10 </p> <p> <span class="emphasis"><em>iscl</em></span> (optional, default=0) - coded scaling factor for resonators. A value of 1 signifies a peak response factor of 1, i.e. all frequencies other than kcf are attenuated in accordance with the (normalized) response curve. A value of 2 raises the response factor so that its overall RMS value equals 1. (This intended equalization of input and output power assumes all frequencies are physically present; hence it is most applicable to white noise.) A zero value signifies no scaling of the signal, leaving that to some later adjustment (see balance). The default value is 0. </p> <p> <span class="emphasis"><em>istor</em></span> (optional, default=0) -- initial disposition of internal data space. Since filtering incorporates a feedback loop of previous output, the initial status of the storage space used is significant. A zero value will clear the space; a non-zero value will allow previous information to remain. The default value is 0. </p> </div> <div class="refsect1" title="Performance"> <a id="idp40633272"></a> <h2>Performance</h2> <p> <span class="emphasis"><em>kres</em></span> - output signal </p> <p> <span class="emphasis"><em>ksig</em></span> - input signal </p> <p> <span class="emphasis"><em>kcf</em></span> - the center frequency of the filter, or frequency position of the peak response. </p> <p> <span class="emphasis"><em>kbw</em></span> - bandwidth of the filter (the Hz difference between the upper and lower half-power points) </p> <p><span class="emphasis"><em>resonxk</em></span> is a lot faster than using individual instances in Csound orchestra of the old opcodes, because only one initialization and 'k' cycle are needed at a time, and the audio loop falls enterely inside the cache memory of processor. </p> </div> <div class="refsect1" title="Examples"> <a id="idp40674072"></a> <h2>Examples</h2> <p> Here is an example of the resonxk opcode. It uses the file <a class="ulink" href="examples/resonxk.csd" target="_top"><em class="citetitle">resonxk.csd</em></a>. </p> <div class="example"> <a id="idp40675048"></a> <p class="title"> <strong>Example 717. Example of the resonxk 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 resonxk.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">nchnls</span> <span class="op">=</span> 2 <span class="ohdr">0dbfs</span> <span class="op">=</span> 1 gisin <span class="ohdr">ftgen</span> 0, 0, 2^10, 10, 1 <span class="oblock">instr</span> 1 ksig <span class="opc">randomh</span> 400, 1800, 150 aout <span class="opc">poscil</span> .2, 1000<span class="op">+</span>ksig, gisin <span class="opc">outs</span> aout, aout <span class="oblock">endin</span> <span class="oblock">instr</span> 2 ksig <span class="opc">randomh</span> 400, 1800, 150 kcf <span class="opc">line</span> 1, p3, 1000 <span class="comment">;vary high-pass</span> ilay <span class="op">=</span> p4 ksig <span class="opc">resonxk</span> ksig, kcf, 100, ilay aout <span class="opc">poscil</span> .2, 1000<span class="op">+</span>ksig, gisin asig <span class="opc">interp</span> ksig <span class="comment">;convert k-rate to a-rate</span> aout <span class="opc">balance</span> asig, aout <span class="comment">;avoid getting asig out of range</span> <span class="opc">outs</span> aout, aout <span class="oblock">endin</span> <span class="csdtag"></CsInstruments></span> <span class="csdtag"><CsScore></span> <span class="stamnt">i</span> 1 0 5 <span class="stamnt">i</span> 2 6 5 1 <span class="comment">;number of filter stack = 1</span> <span class="stamnt">i</span> 2 12 5 5 <span class="comment">;number of filter stack = 5</span> <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="idp40677328"></a> <h2>Credits</h2> <p>Written by Gabriel Maldonado.</p> <p>New in Csound 5 (Previously available only on CsoundAV)</p> </div> </div> <div class="navfooter"> <hr /> <table width="100%" summary="Navigation footer"> <tr> <td width="40%" align="left"><a accesskey="p" href="resonx.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="resony.html">Next</a></td> </tr> <tr> <td width="40%" align="left" valign="top">resonx </td> <td width="20%" align="center"> <a accesskey="h" href="index.html">Home</a> </td> <td width="40%" align="right" valign="top"> resony</td> </tr> </table> </div> </body> </html>