<?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>lowres</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="lowpass2.html" title="lowpass2" /> <link rel="next" href="lowresx.html" title="lowresx" /> </head> <body> <div class="navheader"> <table width="100%" summary="Navigation header"> <tr> <th colspan="3" align="center">lowres</th> </tr> <tr> <td width="20%" align="left"><a accesskey="p" href="lowpass2.html">Prev</a> </td> <th width="60%" align="center">Orchestra Opcodes and Operators</th> <td width="20%" align="right"> <a accesskey="n" href="lowresx.html">Next</a></td> </tr> </table> <hr /> </div> <div class="refentry" title="lowres"> <a id="lowres"></a> <div class="titlepage"></div> <a id="IndexLowres" class="indexterm"></a> <div class="refnamediv"> <h2> <span class="refentrytitle">lowres</span> </h2> <p>lowres — Another resonant lowpass filter. </p> </div> <div class="refsect1" title="Description"> <a id="id2999097"></a> <h2>Description</h2> <p> <span class="emphasis"><em>lowres</em></span> is a resonant lowpass filter. </p> </div> <div class="refsect1" title="Syntax"> <a id="id3000062"></a> <h2>Syntax</h2> <pre class="synopsis">ares <span class="command"><strong>lowres</strong></span> asig, kcutoff, kresonance [, iskip]</pre> </div> <div class="refsect1" title="Initialization"> <a id="id3000081"></a> <h2>Initialization</h2> <p> <span class="emphasis"><em>iskip</em></span> -- initial disposition of internal data space. 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="id3000101"></a> <h2>Performance</h2> <p> <span class="emphasis"><em>asig</em></span> -- input signal </p> <p> <span class="emphasis"><em>kcutoff</em></span> -- filter cutoff frequency point </p> <p> <span class="emphasis"><em>kresonance</em></span> -- resonance amount </p> <p> <span class="emphasis"><em>lowres</em></span> is a resonant lowpass filter derived from a Hans Mikelson orchestra. This implementation is much faster than implementing it in Csound language, and it allows <span class="emphasis"><em>kr</em></span> lower than <span class="emphasis"><em>sr</em></span>. <span class="emphasis"><em>kcutoff</em></span> is not in Hz and <span class="emphasis"><em>kresonance</em></span> is not in dB, so experiment for the finding best results. </p> </div> <div class="refsect1" title="Examples"> <a id="id3000158"></a> <h2>Examples</h2> <p> Here is an example of the lowres opcode. It uses the file <a class="ulink" href="examples/lowres.csd" target="_top"><em class="citetitle">lowres.csd</em></a> and <a class="ulink" href="examples/beats.wav" target="_top"><em class="citetitle">beats.wav</em></a>. </p> <div class="example"> <a id="id3000181"></a> <p class="title"> <b>Example 348. Example of the lowres opcode.</b> </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> <span class="comment">; Audio out Audio in No messages</span> -odac -iadc -d <span class="comment">;;;RT audio I/O</span> <span class="comment">; For Non-realtime ouput leave only the line below:</span> <span class="comment">; -o lowres.wav -W ;;; for file output any platform</span> <span class="csdtag"></CsOptions></span> <span class="csdtag"><CsInstruments></span> <span class="comment">; Initialize the global variables.</span> <span class="ohdr">sr</span> <span class="op">=</span> 44100 <span class="ohdr">kr</span> <span class="op">=</span> 4410 <span class="ohdr">ksmps</span> <span class="op">=</span> 10 <span class="ohdr">nchnls</span> <span class="op">=</span> 1 <span class="comment">; Instrument #1.</span> <span class="oblock">instr</span> 1 <span class="comment">; Use a nice sawtooth waveform.</span> asig <span class="opc">vco</span> 5000, 440, 1 <span class="comment">; Vary the cutoff frequency from 30 to 300 Hz.</span> kcutoff <span class="opc">line</span> 30, p3, 300 kresonance <span class="op">=</span> 10 <span class="comment">; Apply the filter.</span> a1 <span class="opc">lowres</span> asig, kcutoff, kresonance <span class="opc">out</span> a1 <span class="oblock">endin</span> <span class="csdtag"></CsInstruments></span> <span class="csdtag"><CsScore></span> <span class="comment">; Table #1, a sine wave for the vco opcode.</span> <span class="stamnt">f</span> 1 0 16384 10 1 <span class="comment">; Play Instrument #1 for two seconds.</span> <span class="stamnt">i</span> 1 0 2 <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="See Also"> <a id="id3000219"></a> <h2>See Also</h2> <p> <a class="link" href="lowresx.html" title="lowresx"><em class="citetitle">lowresx</em></a> </p> </div> <div class="refsect1" title="Credits"> <a id="id3000236"></a> <h2>Credits</h2> <p> </p> <table border="0" summary="Simple list" class="simplelist"> <tr> <td>Author: Gabriel Maldonado (adapted by John ffitch)</td> </tr> <tr> <td>Italy</td> </tr> </table> <p> </p> <p>Example written by Kevin Conder.</p> <p>New in Csound version 3.49</p> </div> </div> <div class="navfooter"> <hr /> <table width="100%" summary="Navigation footer"> <tr> <td width="40%" align="left"><a accesskey="p" href="lowpass2.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="lowresx.html">Next</a></td> </tr> <tr> <td width="40%" align="left" valign="top">lowpass2 </td> <td width="20%" align="center"> <a accesskey="h" href="index.html">Home</a> </td> <td width="40%" align="right" valign="top"> lowresx</td> </tr> </table> </div> </body> </html>