<?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>rect2pol</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="readscratch.html" title="readscratch" /> <link rel="next" href="reinit.html" title="reinit" /> </head> <body> <div class="navheader"> <table width="100%" summary="Navigation header"> <tr> <th colspan="3" align="center">rect2pol</th> </tr> <tr> <td width="20%" align="left"><a accesskey="p" href="readscratch.html">Prev</a> </td> <th width="60%" align="center">Orchestra Opcodes and Operators</th> <td width="20%" align="right"> <a accesskey="n" href="reinit.html">Next</a></td> </tr> </table> <hr /> </div> <div class="refentry"> <a id="rect2pol"></a> <div class="titlepage"></div> <a id="IndexRect2pol" class="indexterm"></a> <div class="refnamediv"> <h2> <span class="refentrytitle">rect2pol</span> </h2> <p>rect2pol — Rectangular to polar format conversion. </p> </div> <div class="refsect1"> <a id="idm281472895807576"></a> <h2>Description</h2> <p> Converts an input array in real-imaginary format to magnitude-phase format. </p> </div> <div class="refsect1"> <a id="idm281472895806392"></a> <h2>Syntax</h2> <pre class="synopsis">kout[] <span class="command"><strong>rect2pol</strong></span> kin[]</pre> </div> <div class="refsect1"> <a id="idm281472895804184"></a> <h2>Performance</h2> <p> <span class="emphasis"><em>kout[]</em></span> -- output array containing the complex-valued magnitude-phase output. It will be created if it does not exist. </p> <p> <span class="emphasis"><em>kin[]</em></span> -- input array containing the complex-valued real-imaginary input. </p> </div> <div class="refsect1"> <a id="idm281472895744664"></a> <h2>Examples</h2> <p> Here is an example of the rect2pol opcode. It uses the file <a class="ulink" href="examples/rect2pol.csd" target="_top"><em class="citetitle">rect2pol.csd</em></a>.</p> <div class="example"> <a id="idm281472895742792"></a> <p class="title"> <strong>Example 819. Example of the rect2pol 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="idm281472717102168"></a> <pre class="programlisting"> <span class="nt"><CsoundSynthesizer></span> <span class="nt"><CsOptions></span> -d -o dac <span class="nt"></CsOptions></span> <span class="nt"><CsInstruments></span> <span class="cm">/* ksmps needs to be an integer div of hopsize */</span> <span class="vg">ksmps</span> <span class="o">=</span> <span class="mi">64</span> <span class="kd">instr</span> <span class="nf">1</span> i<span class="n">hopsize</span> <span class="o">=</span> <span class="mi">256</span> <span class="c1">; hopsize</span> i<span class="n">fftsize</span> <span class="o">=</span> <span class="mi">1024</span> <span class="c1">; FFT size </span> i<span class="n">olaps</span> <span class="o">=</span> i<span class="n">fftsize</span><span class="o">/</span>i<span class="n">hopsize</span> <span class="c1">; overlaps</span> i<span class="n">bw</span> <span class="o">=</span> <span class="vg">sr</span><span class="o">/</span>i<span class="n">fftsize</span> <span class="c1">; bin bandwidth</span> k<span class="n">cnt</span> <span class="nb">init</span> <span class="mi">0</span> <span class="c1">; counting vars</span> k<span class="n">row</span> <span class="nb">init</span> <span class="mi">0</span> k<span class="n">Ola</span><span class="p">[]</span> <span class="nb">init</span> i<span class="n">fftsize</span> <span class="c1">; overlap-add buffer</span> k<span class="n">In</span><span class="p">[]</span> <span class="nb">init</span> i<span class="n">fftsize</span> <span class="c1">; input buffer</span> k<span class="n">Out</span><span class="p">[][]</span> <span class="nb">init</span> i<span class="n">olaps</span><span class="p">,</span> i<span class="n">fftsize</span> <span class="c1">; output buffers</span> a<span class="n">1</span> <span class="nb">diskin2</span> <span class="s">"fox.wav"</span><span class="p">,</span><span class="mi">1</span><span class="p">,</span><span class="mi">0</span><span class="p">,</span><span class="mi">1</span> <span class="c1">; audio input</span> <span class="cm">/* every hopsize samples */</span> <span class="k">if</span> k<span class="n">cnt</span> <span class="o">==</span> i<span class="n">hopsize</span> <span class="k">then</span> <span class="cm">/* window and take FFT */</span> k<span class="n">Win</span><span class="p">[]</span> <span class="nb">window</span> k<span class="n">In</span><span class="p">,</span>k<span class="n">row</span><span class="o">*</span>i<span class="n">hopsize</span> k<span class="n">Spec</span><span class="p">[]</span> <span class="nb">rfft</span> k<span class="n">Win</span> k<span class="n">Spec</span> <span class="nb">rect2pol</span> k<span class="n">Spec</span> <span class="cm">/* reduce mags between high and low freqs */</span> i<span class="n">low</span> <span class="o">=</span> <span class="mi">0</span> i<span class="n">high</span> <span class="o">=</span> <span class="mi">1000</span> k<span class="n">i</span> <span class="o">=</span> <span class="nb">int</span><span class="p">(</span>i<span class="n">low</span><span class="o">/</span>i<span class="n">bw</span><span class="p">)</span> <span class="k">until</span> k<span class="n">i</span> <span class="o">>=</span> <span class="nb">int</span><span class="p">(</span>i<span class="n">high</span><span class="o">/</span>i<span class="n">bw</span><span class="p">)</span> <span class="k">do</span> k<span class="n">Spec</span><span class="p">[</span>k<span class="n">i</span><span class="p">]</span> <span class="o">=</span> k<span class="n">Spec</span><span class="p">[</span>k<span class="n">i</span><span class="p">]</span><span class="o">*</span><span class="mf">0.1</span> k<span class="n">i</span> <span class="o">+=</span> <span class="mi">2</span> <span class="k">od</span> k<span class="n">Spec</span> <span class="nb">pol2rect</span> k<span class="n">Spec</span> <span class="cm">/* IFFT + window */</span> k<span class="n">Row</span><span class="p">[]</span> <span class="nb">rifft</span> k<span class="n">Spec</span> k<span class="n">Win</span> <span class="nb">window</span> k<span class="n">Row</span><span class="p">,</span> k<span class="n">row</span><span class="o">*</span>i<span class="n">hopsize</span> <span class="cm">/* place it on out buffer */</span> k<span class="n">Out</span> <span class="nb">setrow</span> k<span class="n">Win</span><span class="p">,</span> k<span class="n">row</span> <span class="cm">/* zero the ola buffer */</span> k<span class="n">Ola</span> <span class="o">=</span> <span class="mi">0</span> <span class="cm">/* overlap-add */</span> k<span class="n">i</span> <span class="o">=</span> <span class="mi">0</span> <span class="k">until</span> k<span class="n">i</span> <span class="o">==</span> i<span class="n">olaps</span> <span class="k">do</span> k<span class="n">Row</span> <span class="nb">getrow</span> k<span class="n">Out</span><span class="p">,</span> k<span class="n">i</span> k<span class="n">Ola</span> <span class="o">=</span> k<span class="n">Ola</span> <span class="o">+</span> k<span class="n">Row</span> k<span class="n">i</span> <span class="o">+=</span> <span class="mi">1</span> <span class="k">od</span> <span class="cm">/* update counters */</span> k<span class="n">row</span> <span class="o">=</span> <span class="p">(</span>k<span class="n">row</span><span class="o">+</span><span class="mi">1</span><span class="p">)</span><span class="o">%</span>i<span class="n">olaps</span> k<span class="n">cnt</span> <span class="o">=</span> <span class="mi">0</span> <span class="k">endif</span> <span class="cm">/* shift audio in/out of buffers */</span> k<span class="n">In</span> <span class="nb">shiftin</span> a<span class="n">1</span> a<span class="n">2</span> <span class="nb">shiftout</span> k<span class="n">Ola</span> <span class="nb">out</span> a<span class="n">2</span><span class="o">/</span>i<span class="n">olaps</span> <span class="cm">/* increment counter */</span> k<span class="n">cnt</span> <span class="o">+=</span> <span class="vg">ksmps</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="nt"></CsScore></span> <span class="nt"></CsoundSynthesizer></span> </pre> </div> </div> </div> <br class="example-break" /> </div> <div class="refsect1"> <a id="idm281472895738632"></a> <h2>See Also</h2> <p> <a class="link" href="vectorial.html" title="Vectorial Opcodes"><em class="citetitle"></em>Vectorial opcodes</a>, <a class="link" href="arrayOpcodes.html" title="Array Opcodes"><em class="citetitle"></em>array opcodes</a> </p> </div> <div class="refsect1"> <a id="idm281472895735624"></a> <h2>Credits</h2> <p> </p> <table border="0" summary="Simple list" class="simplelist"> <tr> <td>Author: Victor Lazzarini</td> </tr> <tr> <td>NUI Maynooth</td> </tr> <tr> <td>2014</td> </tr> </table> <p> </p> <p>New in version 6.04</p> </div> </div> <div class="navfooter"> <hr /> <table width="100%" summary="Navigation footer"> <tr> <td width="40%" align="left"><a accesskey="p" href="readscratch.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="reinit.html">Next</a></td> </tr> <tr> <td width="40%" align="left" valign="top">readscratch </td> <td width="20%" align="center"> <a accesskey="h" href="index.html">Home</a> </td> <td width="40%" align="right" valign="top"> reinit</td> </tr> </table> 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