<?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>biquada</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="biquad.html" title="biquad" />
<link rel="next" href="birnd.html" title="birnd" />
</head>
<body>
<div class="navheader">
<table width="100%" summary="Navigation header">
<tr>
<th colspan="3" align="center">biquada</th>
</tr>
<tr>
<td width="20%" align="left"><a accesskey="p" href="biquad.html">Prev</a> </td>
<th width="60%" align="center">Orchestra Opcodes and Operators</th>
<td width="20%" align="right"> <a accesskey="n" href="birnd.html">Next</a></td>
</tr>
</table>
<hr />
</div>
<div class="refentry" title="biquada">
<a id="biquada"></a>
<div class="titlepage"></div>
<a id="IndexBiquada" class="indexterm"></a>
<div class="refnamediv">
<h2>
<span class="refentrytitle">biquada</span>
</h2>
<p>biquada —
A sweepable general purpose biquadratic digital filter with a-rate parameters.
</p>
</div>
<div class="refsect1" title="Description">
<a id="idp14841200"></a>
<h2>Description</h2>
<p>
A sweepable general purpose biquadratic digital filter.
</p>
</div>
<div class="refsect1" title="Syntax">
<a id="idp14841864"></a>
<h2>Syntax</h2>
<pre class="synopsis">ares <span class="command"><strong>biquada</strong></span> asig, ab0, ab1, ab2, aa0, aa1, aa2 [, iskip]</pre>
</div>
<div class="refsect1" title="Initialization">
<a id="idp14844448"></a>
<h2>Initialization</h2>
<p>
<span class="emphasis"><em>iskip</em></span> (optional, default=0) -- if non-zero, intialization will be skipped. Default value 0. (New in Csound version 3.50)
</p>
</div>
<div class="refsect1" title="Performance">
<a id="idp14845384"></a>
<h2>Performance</h2>
<p>
<span class="emphasis"><em>asig</em></span> -- input signal
</p>
<p>
<span class="emphasis"><em>biquada</em></span> is a general purpose biquadratic digital filter of the form:
</p>
<div class="literallayout">
<p><br />
a0*y(n) + a1*y[n-1] + a2*y[n-2] = b0*x[n] + b1*x[n-1] + b2*x[n-2]<br />
</p>
</div>
<p>
</p>
<p>
This filter has the following frequency response:
</p>
<div class="literallayout">
<p><br />
B(Z) b0 + b1*Z<sup>-1</sup> + b2*Z<sup>-2</sup><br />
H(Z) = ---- = ------------------<br />
A(Z) a0 + a1*Z<sup>-1</sup> + a2*Z<sup>-2</sup><br />
</p>
</div>
<p>
</p>
<p>
This type of filter is often encountered in digital signal processing literature. It allows six user-defined a-rate coefficients.
</p>
</div>
<div class="refsect1" title="See Also">
<a id="idp14891504"></a>
<h2>See Also</h2>
<p>
<a class="link" href="biquad.html" title="biquad"><em class="citetitle">biquad</em></a>
</p>
</div>
<div class="refsect1" title="Credits">
<a id="idp14892560"></a>
<h2>Credits</h2>
<p>
</p>
<table border="0" summary="Simple list" class="simplelist">
<tr>
<td>Author: Hans Mikelson</td>
</tr>
<tr>
<td>October 1998</td>
</tr>
</table>
<p>
</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="biquad.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="birnd.html">Next</a></td>
</tr>
<tr>
<td width="40%" align="left" valign="top">biquad </td>
<td width="20%" align="center">
<a accesskey="h" href="index.html">Home</a>
</td>
<td width="40%" align="right" valign="top"> birnd</td>
</tr>
</table>
</div>
</body>
</html>
distrib
>
Mageia
>
5
>
x86_64
>
media
>
core-release
>
by-pkgid
>
b707d9a4ee443103660a75ccb6e51334
>
files
>
394
