<?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>vbap4move</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="vbap4.html" title="vbap4" /> <link rel="next" href="vbap8.html" title="vbap8" /> </head> <body> <div class="navheader"> <table width="100%" summary="Navigation header"> <tr> <th colspan="3" align="center">vbap4move</th> </tr> <tr> <td width="20%" align="left"><a accesskey="p" href="vbap4.html">Prev</a> </td> <th width="60%" align="center">Orchestra Opcodes and Operators</th> <td width="20%" align="right"> <a accesskey="n" href="vbap8.html">Next</a></td> </tr> </table> <hr /> </div> <div class="refentry"> <a id="vbap4move"></a> <div class="titlepage"></div> <a id="IndexVbap4move" class="indexterm"></a> <div class="refnamediv"> <h2> <span class="refentrytitle">vbap4move</span> </h2> <p>vbap4move — Distributes an audio signal among 4 channels with moving virtual sources. </p> </div> <div class="refsect1"> <a id="idm281472875339320"></a> <h2>Description</h2> <p> Distributes an audio signal among 4 channels with moving virtual sources. </p> </div> <div class="refsect1"> <a id="idm281472875295736"></a> <h2>Syntax</h2> <pre class="synopsis">ar1, ar2, ar3, ar4 <span class="command"><strong>vbap4move</strong></span> asig, idur, ispread, ifldnum, ifld1 \ [, ifld2] [...]</pre> </div> <div class="refsect1"> <a id="idm281472875293560"></a> <h2>Initialization</h2> <p> <span class="emphasis"><em>idur</em></span> -- the duration over which the movement takes place. </p> <p> <span class="emphasis"><em>ispread</em></span> -- spreading of the virtual source (range 0 - 100). If value is zero, conventional amplitude panning is used. When <span class="emphasis"><em>ispread</em></span> is increased, the number of loudspeakers used in panning increases. If value is 100, the sound is applied to all loudspeakers. </p> <p> <span class="emphasis"><em>ifldnum</em></span> -- number of fields (absolute value must be 2 or larger). If <span class="emphasis"><em>ifldnum</em></span> is positive, the virtual source movement is a polyline specified by given directions. Each transition is performed in an equal time interval. If <span class="emphasis"><em>ifldnum</em></span> is negative, specified angular velocities are applied to the virtual source during specified relative time intervals (see below). </p> <p> <span class="emphasis"><em>ifld1, ifld2, ...</em></span> -- azimuth angles or angular velocities, and relative durations of movement phases (see below). </p> </div> <div class="refsect1"> <a id="idm281472875287432"></a> <h2>Performance</h2> <p> <span class="emphasis"><em>asig</em></span> -- audio signal to be panned </p> <p> <span class="emphasis"><em>vbap4move</em></span> allows the use of moving virtual sources. If <span class="emphasis"><em>ifldnum</em></span> is positive, the fields represent directions of virtual sources and equal times, <span class="emphasis"><em>iazi1</em></span>, [<span class="emphasis"><em>iele1</em></span>,] <span class="emphasis"><em>iazi2</em></span>, [<span class="emphasis"><em>iele2</em></span>,], etc. The position of the virtual source is interpolated between directions starting from the first direction and ending at the last. Each interval is interpolated in time that is fraction total_time / number_of_intervals of the duration of the sound event. </p> <p> If <span class="emphasis"><em>ifldnum</em></span> is negative, the fields represent angular velocities and equal times. The first field is, however, the starting direction, <span class="emphasis"><em>iazi1</em></span>, [<span class="emphasis"><em>iele1</em></span>,] <span class="emphasis"><em>iazi_vel1</em></span>, [<span class="emphasis"><em>iele_vel1</em></span>,] <span class="emphasis"><em>iazi_vel2</em></span>, [<span class="emphasis"><em>iele_vel2</em></span>,] .... Each velocity is applied to the note that is fraction total_time / number_of_velocities of the duration of the sound event. If the elevation of the virtual source becomes greater than 90 degrees or less than 0 degrees, the polarity of angular velocity is changed. Thus the elevational angular velocity produces a virtual source that moves up and down between 0 and 90 degrees. </p> <div class="warning" style="margin-left: 0.5in; margin-right: 0.5in;"> <table border="0" summary="Warning"> <tr> <td rowspan="2" align="center" valign="top" width="25"> <img alt="[Warning]" src="images/warning.png" /> </td> <th align="left">Warning</th> </tr> <tr> <td align="left" valign="top"> <p>Please note that all <span class="emphasis"><em>vbap</em></span> panning opcodes require the <span class="emphasis"><em>vbap</em></span> system to be initialized using <a class="link" href="vbaplsinit.html" title="vbaplsinit"><em class="citetitle">vbaplsinit</em></a>.</p> </td> </tr> </table> </div> </div> <div class="refsect1"> <a id="idm281472875275928"></a> <h2>Examples</h2> <p> See the entry for <a class="link" href="vbap8move.html" title="vbap8move"><em class="citetitle">vbap8move</em></a> for an example of usage of the <span class="emphasis"><em>vbapXmove</em></span> opcodes. </p> </div> <div class="refsect1"> <a id="idm281472875273272"></a> <h2>Reference</h2> <p> Ville Pulkki: <span class="quote">“<span class="quote">Virtual Sound Source Positioning Using Vector Base Amplitude Panning</span>”</span> <span class="emphasis"><em>Journal of the Audio Engineering Society</em></span>, 1997 June, Vol. 45/6, p. 456. </p> </div> <div class="refsect1"> <a id="idm281472875271096"></a> <h2>Examples</h2> <p> Here is an example of the vbap4move opcode. It uses the file <a class="ulink" href="examples/vbap4move.csd" target="_top"><em class="citetitle">vbap4move.csd</em></a>. </p> <div class="example"> <a id="idm281472875269240"></a> <p class="title"> <strong>Example 1056. Example of the vbap4move 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="idm281472695529416"></a> <pre class="programlisting"> <span class="nt"><CsoundSynthesizer></span> <span class="nt"><CsOptions></span> <span class="c1">; Select audio/midi flags here according to platform</span> -odac <span class="c1">;;;realtime audio out</span> <span class="c1">;-iadc ;;;uncomment -iadc if realtime audio input is needed too</span> <span class="c1">; For Non-realtime ouput leave only the line below:</span> <span class="c1">; -o vbap4move.wav -W ;;; for file output any platform</span> <span class="nt"></CsOptions></span> <span class="nt"><CsInstruments></span> <span class="vg">sr</span> <span class="o">=</span> <span class="mi">44100</span> <span class="vg">ksmps</span> <span class="o">=</span> <span class="mi">32</span> <span class="vg">nchnls</span> <span class="o">=</span> <span class="mi">4</span> <span class="c1">;quad</span> <span class="vg">0dbfs</span> <span class="o">=</span> <span class="mi">1</span> <span class="nb">vbaplsinit</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">4</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">90</span><span class="p">,</span> <span class="mi">180</span><span class="p">,</span> <span class="mi">270</span> <span class="kd">instr</span> <span class="nf">1</span> a<span class="n">sig</span> <span class="nb">diskin2</span> <span class="s">"beats.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">;loop beats.wav</span> a<span class="n">1</span><span class="p">,</span>a<span class="n">2</span><span class="p">,</span>a<span class="n">3</span><span class="p">,</span>a<span class="n">4</span> <span class="nb">vbap4move</span> a<span class="n">sig</span><span class="p">,</span> <span class="nb">p3</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">310</span><span class="p">,</span> <span class="mi">180</span> <span class="c1">;change movement of soundsource in</span> <span class="nb">outq</span> a<span class="n">1</span><span class="p">,</span>a<span class="n">2</span><span class="p">,</span>a<span class="n">3</span><span class="p">,</span>a<span class="n">4</span> <span class="c1">;the rear speakers</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">5</span> <span class="nb">e</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="idm281472875264952"></a> <h2>See Also</h2> <p> <a class="link" href="vbap16.html" title="vbap16"><em class="citetitle">vbap16</em></a>, <a class="link" href="vbap16move.html" title="vbap16move"><em class="citetitle">vbap16move</em></a>, <a class="link" href="vbap4.html" title="vbap4"><em class="citetitle">vbap4</em></a>, <a class="link" href="vbap8.html" title="vbap8"><em class="citetitle">vbap8</em></a>, <a class="link" href="vbap8move.html" title="vbap8move"><em class="citetitle">vbap8move</em></a>, <a class="link" href="vbaplsinit.html" title="vbaplsinit"><em class="citetitle">vbaplsinit</em></a>, <a class="link" href="vbapz.html" title="vbapz"><em class="citetitle">vbapz</em></a>, <a class="link" href="vbapzmove.html" title="vbapzmove"><em class="citetitle">vbapzmove</em></a> </p> </div> <div class="refsect1"> <a id="idm281472875256184"></a> <h2>Credits</h2> <p> </p> <table border="0" summary="Simple list" class="simplelist"> <tr> <td>Author: Ville Pulkki</td> </tr> <tr> <td>Sibelius Academy Computer Music Studio</td> </tr> <tr> <td>Laboratory of Acoustics and Audio Signal Processing</td> </tr> <tr> <td>Helsinki University of Technology</td> </tr> <tr> <td>Helsinki, Finland</td> </tr> <tr> <td>May 2000</td> </tr> </table> <p> </p> <p>New in Csound Version 4.07</p> </div> </div> <div class="navfooter"> <hr /> <table width="100%" summary="Navigation footer"> <tr> <td width="40%" align="left"><a accesskey="p" href="vbap4.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="vbap8.html">Next</a></td> </tr> <tr> <td width="40%" align="left" valign="top">vbap4 </td> <td width="20%" align="center"> <a accesskey="h" 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