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<div class="refentry" title="vbap4move">
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<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" title="Description">
<a id="idp50511760"></a>
<h2>Description</h2>
<p>
Distributes an audio signal among 4 channels with moving virtual sources.
</p>
</div>
<div class="refsect1" title="Syntax">
<a id="idp50512448"></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" title="Initialization">
<a id="idp50515936"></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" title="Performance">
<a id="idp50568160"></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" title="Warning" style="margin-left: 0.5in; margin-right: 0.5in;">
<table border="0" summary="Warning">
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<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>
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</div>
<div class="refsect1" title="Examples">
<a id="idp50574416"></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" title="Reference">
<a id="idp50575776"></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" title="Examples">
<a id="idp50576960"></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="idp50577952"></a>
<p class="title">
<strong>Example 924. 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>
<pre class="programlisting">
<span class="csdtag"><CsoundSynthesizer></span>
<span class="csdtag"><CsOptions></span>
<span class="comment">; Select audio/midi flags here according to platform</span>
-odac <span class="comment">;;;realtime audio out</span>
<span class="comment">;-iadc ;;;uncomment -iadc if realtime audio input is needed too</span>
<span class="comment">; For Non-realtime ouput leave only the line below:</span>
<span class="comment">; -o vbap4move.wav -W ;;; for file output any platform</span>
<span class="csdtag"></CsOptions></span>
<span class="csdtag"><CsInstruments></span>
<span class="ohdr">sr</span> <span class="op">=</span> 44100
<span class="ohdr">ksmps</span> <span class="op">=</span> 32
<span class="ohdr">nchnls</span> <span class="op">=</span> 4 <span class="comment">;quad</span>
<span class="ohdr">0dbfs</span> <span class="op">=</span> 1
<span class="opc">vbaplsinit</span> 2, 4, 0, 90, 180, 270
<span class="oblock">instr</span> 1
asig <span class="opc">diskin2</span> "beats.wav", 1, 0, 1 <span class="comment">;loop beats.wav</span>
a1,a2,a3,a4 <span class="opc">vbap4move</span> asig, p3, 1, 2, 310, 180 <span class="comment">;change movement of soundsource in</span>
<span class="opc">outq</span> a1,a2,a3,a4 <span class="comment">;the rear speakers</span>
<span class="oblock">endin</span>
<span class="csdtag"></CsInstruments></span>
<span class="csdtag"><CsScore></span>
<span class="stamnt">i</span> 1 0 5
<span class="stamnt">e</span>
<span class="csdtag"></CsScore></span>
<span class="csdtag"></CsoundSynthesizer></span>
</pre>
</div>
</div>
<p><br class="example-break" />
</p>
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<div class="refsect1" title="See Also">
<a id="idp50580232"></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" title="Credits">
<a id="idp50584608"></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>
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