<?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>streson</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="strcmpk.html" title="strcmpk" /> <link rel="next" href="strget.html" title="strget" /> </head> <body> <div class="navheader"> <table width="100%" summary="Navigation header"> <tr> <th colspan="3" align="center">streson</th> </tr> <tr> <td width="20%" align="left"><a accesskey="p" href="strcmpk.html">Prev</a> </td> <th width="60%" align="center">Orchestra Opcodes and Operators</th> <td width="20%" align="right"> <a accesskey="n" href="strget.html">Next</a></td> </tr> </table> <hr /> </div> <div class="refentry" title="streson"> <a id="streson"></a> <div class="titlepage"></div> <a id="IndexStreson" class="indexterm"></a> <div class="refnamediv"> <h2> <span class="refentrytitle">streson</span> </h2> <p>streson — A string resonator with variable fundamental frequency. </p> </div> <div class="refsect1" title="Description"> <a id="idp46368704"></a> <h2>Description</h2> <p> An audio signal is modified by a string resonator with variable fundamental frequency. </p> </div> <div class="refsect1" title="Syntax"> <a id="idp46369520"></a> <h2>Syntax</h2> <pre class="synopsis">ares <span class="command"><strong>streson</strong></span> asig, kfr, ifdbgain</pre> </div> <div class="refsect1" title="Initialization"> <a id="idp46372400"></a> <h2>Initialization</h2> <p> <span class="emphasis"><em>ifdbgain</em></span> -- feedback gain, between 0 and 1, of the internal delay line. A value close to 1 creates a slower decay and a more pronounced resonance. Small values may leave the input signal unaffected. Depending on the filter frequency, typical values are > .9. </p> </div> <div class="refsect1" title="Performance"> <a id="idp46373728"></a> <h2>Performance</h2> <p> <span class="emphasis"><em>asig</em></span> -- the input audio signal. </p> <p> <span class="emphasis"><em>kfr</em></span> -- the fundamental frequency of the string. </p> <p> <span class="emphasis"><em>streson</em></span> passes the input <span class="emphasis"><em>asig</em></span> through a network composed of comb, low-pass and all-pass filters, similar to the one used in some versions of the Karplus-Strong algorithm, creating a string resonator effect. The fundamental frequency of the <span class="quote">“<span class="quote">string</span>”</span> is controlled by the k-rate variable <span class="emphasis"><em>kfr</em></span>.This opcode can be used to simulate sympathetic resonances to an input signal. </p> <p> See <a class="link" href="MiscModalFreq.html" title="Appendix E. Modal Frequency Ratios"><em class="citetitle">Modal Frequency Ratios</em></a> for frequency ratios of real intruments which can be used to determine the values of <span class="emphasis"><em>kfrq</em></span>. </p> <p> <span class="emphasis"><em>streson</em></span> is an adaptation of the StringFlt object of the SndObj Sound Object Library developed by the author. </p> </div> <div class="refsect1" title="Examples"> <a id="idp46393960"></a> <h2>Examples</h2> <p> Here is an example of the streson opcode. It uses the file <a class="ulink" href="examples/streson.csd" target="_top"><em class="citetitle">streson.csd</em></a>. </p> <div class="example"> <a id="idp46394944"></a> <p class="title"> <strong>Example 829. Example of the streson 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 streson.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 asig <span class="opc">diskin2</span> "fox.wav", 1, 0, 1 kfr <span class="op">=</span> p4 ifdbgain <span class="op">=</span> 0.90 astr <span class="opc">streson</span> asig, kfr, ifdbgain asig <span class="opc">clip</span> astr, 0, 1 <span class="opc">outs</span> asig, asig <span class="oblock">endin</span> <span class="csdtag"></CsInstruments></span> <span class="csdtag"><CsScore></span> <span class="stamnt">i</span> 1 0 1 20 <span class="stamnt">i</span> 1 + . > <span class="stamnt">i</span> 1 + . > <span class="stamnt">i</span> 1 + . > <span class="stamnt">i</span> 1 + . > <span class="stamnt">i</span> 1 + . > <span class="stamnt">i</span> 1 + . 1000 <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="idp46397200"></a> <h2>Credits</h2> <p> </p> <table border="0" summary="Simple list" class="simplelist"> <tr> <td>Author: Victor Lazzarini</td> </tr> <tr> <td>Music Department</td> </tr> <tr> <td>National University of Ireland, Maynooth</td> </tr> <tr> <td>Maynooth, Co. Kildare</td> </tr> <tr> <td>1998</td> </tr> </table> <p> </p> <p>New in Csound version 3.494</p> </div> </div> <div class="navfooter"> <hr /> <table width="100%" summary="Navigation footer"> <tr> <td width="40%" align="left"><a accesskey="p" href="strcmpk.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="strget.html">Next</a></td> </tr> <tr> <td width="40%" align="left" valign="top">strcmpk </td> <td width="20%" align="center"> <a accesskey="h" href="index.html">Home</a> </td> <td width="40%" align="right" valign="top"> strget</td> </tr> </table> </div> </body> </html>