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<div class="refentry" title="vbap8move">
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<h2>
<span class="refentrytitle">vbap8move</span>
</h2>
<p>vbap8move —
Distributes an audio signal among 8 channels with moving virtual sources.
</p>
</div>
<div class="refsect1" title="Description">
<a id="idp50609920"></a>
<h2>Description</h2>
<p>
Distributes an audio signal among 8 channels with moving virtual sources.
</p>
</div>
<div class="refsect1" title="Syntax">
<a id="idp50610608"></a>
<h2>Syntax</h2>
<pre class="synopsis">ar1, ..., ar8 <span class="command"><strong>vbap8move</strong></span> asig, idur, ispread, ifldnum, ifld1 \
[, ifld2] [...]</pre>
</div>
<div class="refsect1" title="Initialization">
<a id="idp50663688"></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="idp50667168"></a>
<h2>Performance</h2>
<p>
<span class="emphasis"><em>asig</em></span> -- audio signal to be panned
</p>
<p>
<span class="emphasis"><em>vbap8move</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 class="refsect1" title="Example">
<a id="idp50673440"></a>
<h2>Example</h2>
<p>
Here is a simple example of the <span class="emphasis"><em>vbap8move</em></span> opcode. It uses the file <a class="ulink" href="examples/vbap8move.csd" target="_top"><em class="citetitle">vbap8move.csd</em></a>.
</p>
<div class="example">
<a id="idp50674640"></a>
<p class="title">
<strong>Example 926. Example of the vbap8move 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>
<span class="comment">; Audio out Audio in</span>
-odac -iadc <span class="comment">;;;RT audio I/O</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> 48000
<span class="ohdr">ksmps</span> <span class="op">=</span> 10
<span class="ohdr">nchnls</span> <span class="op">=</span> 8
<span class="comment">;Example by Hector Centeno 2007</span>
<span class="opc">vbaplsinit</span> 2, 8, 15, 65, 115, 165, 195, 245, 295, 345
<span class="oblock">instr</span> 1
ifldnum <span class="op">=</span> 9
ispread <span class="op">=</span> 30
idur <span class="op">=</span> p3
<span class="comment">;; Generate a sound source</span>
kenv <span class="opc">loopseg</span> 10, 0, 0, 0, 0.5, 1, 10, 0
a1 <span class="opc">pinkish</span> 3000<span class="op">*</span>kenv
<span class="comment">;; Move circling around once all the speakers</span>
aout1, aout2, aout3, aout4, aout5, aout6, aout7, aout8 <span class="opc">vbap8move</span> a1, idur, ispread, ifldnum, 15, 65, 115, 165, 195, 245, 295, 345, 15
<span class="comment">;; Speaker mapping</span>
aFL <span class="op">=</span> aout8 <span class="comment">; Front Left</span>
aFR <span class="op">=</span> aout1 <span class="comment">; Front Right</span>
aMFL <span class="op">=</span> aout7 <span class="comment">; Mid Front Left</span>
aMFR <span class="op">=</span> aout2 <span class="comment">; Mid Front Right</span>
aMBL <span class="op">=</span> aout6 <span class="comment">; Mid Back Left</span>
aMBR <span class="op">=</span> aout3 <span class="comment">; Mid Back Right</span>
aBL <span class="op">=</span> aout5 <span class="comment">; Back Left</span>
aBR <span class="op">=</span> aout4 <span class="comment">; Back Right</span>
<span class="opc">outo</span> aFL, aFR, aMFL, aMFR, aMBL, aMBR, aBL, aBR
<span class="oblock">endin</span>
<span class="csdtag"></CsInstruments></span>
<span class="csdtag"><CsScore></span>
<span class="stamnt">i</span>1 0 30
<span class="stamnt">e</span>
<span class="csdtag"></CsScore></span>
<span class="csdtag"></CsoundSynthesizer></span>
</pre>
</div>
</div>
<p><br class="example-break" />
</p>
</div>
<div class="refsect1" title="Reference">
<a id="idp50676920"></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="idp50678088"></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="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="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="idp50682480"></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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