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<h2>
<span class="refentrytitle">vbap16move</span>
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<p>vbap16move —
Distribute an audio signal among 16 channels with moving virtual sources.
</p>
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<div class="refsect1" title="Description">
<a id="idp50416216"></a>
<h2>Description</h2>
<p>
Distribute an audio signal among 16 channels with moving virtual sources.
</p>
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<div class="refsect1" title="Syntax">
<a id="idp50416904"></a>
<h2>Syntax</h2>
<pre class="synopsis">ar1, ..., ar16 <span class="command"><strong>vbap16move</strong></span> asig, idur, ispread, ifldnum, ifld1 \
[, ifld2] [...]</pre>
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<div class="refsect1" title="Initialization">
<a id="idp50467384"></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>
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<div class="refsect1" title="Performance">
<a id="idp50470832"></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>
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<th align="left">Warning</th>
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<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>
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<div class="refsect1" title="Examples">
<a id="idp50477104"></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="idp50478464"></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="See Also">
<a id="idp50479648"></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>
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<div class="refsect1" title="Credits">
<a id="idp50484544"></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>
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<td>Helsinki, Finland</td>
</tr>
<tr>
<td>May 2000</td>
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<p>New in Csound Version 4.07</p>
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