<?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>vbap16move</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="vbap16.html" title="vbap16" /> <link rel="next" href="vbap4.html" title="vbap4" /> </head> <body> <div class="navheader"> <table width="100%" summary="Navigation header"> <tr> <th colspan="3" align="center">vbap16move</th> </tr> <tr> <td width="20%" align="left"><a accesskey="p" href="vbap16.html">Prev</a> </td> <th width="60%" align="center">Orchestra Opcodes and Operators</th> <td width="20%" align="right"> <a accesskey="n" href="vbap4.html">Next</a></td> </tr> </table> <hr /> </div> <div class="refentry"> <a id="vbap16move"></a> <div class="titlepage"></div> <a id="IndexVbap16move" class="indexterm"></a> <div class="refnamediv"> <h2> <span class="refentrytitle">vbap16move</span> </h2> <p>vbap16move — Distribute an audio signal among 16 channels with moving virtual sources. </p> </div> <div class="refsect1"> <a id="idm281472875522104"></a> <h2>Description</h2> <p> Distribute an audio signal among 16 channels with moving virtual sources. </p> </div> <div class="refsect1"> <a id="idm281472875479784"></a> <h2>Syntax</h2> <pre class="synopsis">ar1, ..., ar16 <span class="command"><strong>vbap16move</strong></span> asig, idur, ispread, ifldnum, ifld1 \ [, ifld2] [...]</pre> </div> <div class="refsect1"> <a id="idm281472875477704"></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. </p> </div> <div class="refsect1"> <a id="idm281472875471608"></a> <h2>Performance</h2> <p> <span class="emphasis"><em>asig</em></span> -- audio signal to be panned </p> <p> <span class="emphasis"><em>vbap16move</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="idm281472875460104"></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="idm281472875457448"></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="idm281472875455272"></a> <h2>See Also</h2> <p> <a class="link" href="vbap16.html" title="vbap16"><em class="citetitle">vbap16</em></a>, <a class="link" href="vbap4.html" title="vbap4"><em class="citetitle">vbap4</em></a>, <a class="link" href="vbap4move.html" title="vbap4move"><em class="citetitle">vbap4move</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>, <a class="link" href="vbaplsinit.html" title="vbaplsinit"><em class="citetitle">vbapzmove</em></a> </p> </div> <div class="refsect1"> <a id="idm281472875445480"></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="vbap16.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="vbap4.html">Next</a></td> </tr> <tr> <td width="40%" align="left" valign="top">vbap16 </td> <td width="20%" align="center"> <a accesskey="h" href="index.html">Home</a> </td> <td width="40%" align="right" valign="top"> vbap4</td> </tr> </table> </div> </body> </html>