<?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>hilbert2</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="hilbert.html" title="hilbert" /> <link rel="next" href="hrtfearly.html" title="hrtfearly" /> </head> <body> <div class="navheader"> <table width="100%" summary="Navigation header"> <tr> <th colspan="3" align="center">hilbert2</th> </tr> <tr> <td width="20%" align="left"><a accesskey="p" href="hilbert.html">Prev</a> </td> <th width="60%" align="center">Orchestra Opcodes and Operators</th> <td width="20%" align="right"> <a accesskey="n" href="hrtfearly.html">Next</a></td> </tr> </table> <hr /> </div> <div class="refentry"> <a id="hilbert2"></a> <div class="titlepage"></div> <a id="IndexHilbert2" class="indexterm"></a> <div class="refnamediv"> <h2> <span class="refentrytitle">hilbert2</span> </h2> <p>hilbert2 — A Hilbert rransformer. </p> </div> <div class="refsect1"> <a id="idm281472925798856"></a> <h2>Description</h2> <p> A DFT-based implementation of a Hilbert transformer. </p> </div> <div class="refsect1"> <a id="idm281472925755064"></a> <h2>Syntax</h2> <pre class="synopsis">ar1, ar2 <span class="command"><strong>hilbert2</strong></span> asig, ifftsize, ihopsize</pre> </div> <div class="refsect1"> <a id="idm281472925752840"></a> <h2>Initialisation</h2> <p> <span class="emphasis"><em>ifftsize</em></span> -- DFT analysis size </p> <p> <span class="emphasis"><em>ihopsize</em></span> -- analysis hopsize </p> </div> <div class="refsect1"> <a id="idm281472925750344"></a> <h2>Performance</h2> <p> <span class="emphasis"><em>asig</em></span> -- input signal </p> <p> <span class="emphasis"><em>ar1</em></span> -- real output of <span class="emphasis"><em>asig</em></span> </p> <p> <span class="emphasis"><em>ar2</em></span> -- imag output of <span class="emphasis"><em>asig</em></span> </p> <p> <span class="emphasis"><em>hilbert2</em></span> is a DFT-based implementation of the Hilbert Transform producing two outputs in quadrature (90 degree phase difference across the spectrum). Unlike the IIR-based <span class="emphasis"><em>hilbert</em></span> opcode, <span class="emphasis"><em>hilbert2</em></span> has a linear frequency response. Given that it employs a streaming algorithm, a delay of fftsize samples will be imposed between input and output. </p> </div> <div class="refsect1"> <a id="idm281472925744232"></a> <h2>Example</h2> <p> Here is an example of the hilbert2 opcode. It uses the file <a class="ulink" href="examples/hilbert2.csd" target="_top"><em class="citetitle">hilbert2.csd</em></a>. </p> <div class="example"> <a id="idm281472925742376"></a> <p class="title"> <strong>Example 401. Example of the hilbert2 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="idm281472756055560"></a> <pre class="programlisting"> <span class="nt"><CsoundSynthesizer></span> <span class="nt"><CsOptions></span> <span class="nt"></CsOptions></span> <span class="nt"><CsInstruments></span> <span class="kd">instr</span> <span class="nf">1</span> a<span class="n">sig</span> <span class="nb">oscili</span> <span class="nb">p4</span><span class="p">,</span> <span class="nb">p5</span> a<span class="n">1</span><span class="p">,</span>a<span class="n">2</span> <span class="n">hilbert2</span> a<span class="n">sig</span><span class="p">,</span><span class="mi">1024</span><span class="p">,</span><span class="mi">256</span> <span class="nb">outs</span> a<span class="n">1</span><span class="p">,</span> a<span class="n">2</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">10</span> <span class="mf">0.5</span> <span class="mi">440</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="idm281472925738184"></a> <h2>Credits</h2> <p> </p> <table border="0" summary="Simple list" class="simplelist"> <tr> <td>Author: Victor Lazzarini</td> </tr> <tr> <td>2017</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="hilbert.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="hrtfearly.html">Next</a></td> </tr> <tr> <td width="40%" align="left" valign="top">hilbert </td> <td width="20%" align="center"> <a accesskey="h" href="index.html">Home</a> </td> <td width="40%" align="right" valign="top"> hrtfearly</td> </tr> </table> </div> </body> </html>