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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">
<a id="idm281472875151480"></a>
<h2>Description</h2>
<p>
Distributes an audio signal among 8 channels with moving virtual sources.
</p>
</div>
<div class="refsect1">
<a id="idm281472875107976"></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">
<a id="idm281472875105800"></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="idm281472875099672"></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>
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<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">
<a id="idm281472875088168"></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="idm281472875085880"></a>
<p class="title">
<strong>Example 1058. 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>
<div class="refsect1">
<a id="idm281472695313496"></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>
<span class="c1">; Audio out Audio in</span>
-odac -iadc <span class="c1">;;;RT audio I/O</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">48000</span>
<span class="vg">ksmps</span> <span class="o">=</span> <span class="mi">10</span>
<span class="vg">nchnls</span> <span class="o">=</span> <span class="mi">8</span>
<span class="c1">;Example by Hector Centeno 2007</span>
<span class="nb">vbaplsinit</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">8</span><span class="p">,</span> <span class="mi">15</span><span class="p">,</span> <span class="mi">65</span><span class="p">,</span> <span class="mi">115</span><span class="p">,</span> <span class="mi">165</span><span class="p">,</span> <span class="mi">195</span><span class="p">,</span> <span class="mi">245</span><span class="p">,</span> <span class="mi">295</span><span class="p">,</span> <span class="mi">345</span>
<span class="kd">instr</span> <span class="nf">1</span>
i<span class="n">fldnum</span> <span class="o">=</span> <span class="mi">9</span>
i<span class="n">spread</span> <span class="o">=</span> <span class="mi">30</span>
i<span class="n">dur</span> <span class="o">=</span> <span class="nb">p3</span>
<span class="c1">;; Generate a sound source</span>
k<span class="n">env</span> <span class="nb">loopseg</span> <span class="mi">10</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="mf">0.5</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="mi">10</span><span class="p">,</span> <span class="mi">0</span>
a<span class="n">1</span> <span class="nb">pinkish</span> <span class="mi">3000</span><span class="o">*</span>k<span class="n">env</span>
<span class="c1">;; Move circling around once all the speakers</span>
a<span class="n">out1</span><span class="p">,</span> a<span class="n">out2</span><span class="p">,</span> a<span class="n">out3</span><span class="p">,</span> a<span class="n">out4</span><span class="p">,</span> a<span class="n">out5</span><span class="p">,</span> a<span class="n">out6</span><span class="p">,</span> a<span class="n">out7</span><span class="p">,</span> a<span class="n">out8</span> <span class="nb">vbap8move</span> a<span class="n">1</span><span class="p">,</span> i<span class="n">dur</span><span class="p">,</span> i<span class="n">spread</span><span class="p">,</span> i<span class="n">fldnum</span><span class="p">,</span> <span class="mi">15</span><span class="p">,</span> <span class="mi">65</span><span class="p">,</span> <span class="mi">115</span><span class="p">,</span> <span class="mi">165</span><span class="p">,</span> <span class="mi">195</span><span class="p">,</span> <span class="mi">245</span><span class="p">,</span> <span class="mi">295</span><span class="p">,</span> <span class="mi">345</span><span class="p">,</span> <span class="mi">15</span>
<span class="c1">;; Speaker mapping</span>
a<span class="n">FL</span> <span class="o">=</span> a<span class="n">out8</span> <span class="c1">; Front Left</span>
a<span class="n">FR</span> <span class="o">=</span> a<span class="n">out1</span> <span class="c1">; Front Right</span>
a<span class="n">MFL</span> <span class="o">=</span> a<span class="n">out7</span> <span class="c1">; Mid Front Left</span>
a<span class="n">MFR</span> <span class="o">=</span> a<span class="n">out2</span> <span class="c1">; Mid Front Right</span>
a<span class="n">MBL</span> <span class="o">=</span> a<span class="n">out6</span> <span class="c1">; Mid Back Left</span>
a<span class="n">MBR</span> <span class="o">=</span> a<span class="n">out3</span> <span class="c1">; Mid Back Right</span>
a<span class="n">BL</span> <span class="o">=</span> a<span class="n">out5</span> <span class="c1">; Back Left</span>
a<span class="n">BR</span> <span class="o">=</span> a<span class="n">out4</span> <span class="c1">; Back Right</span>
<span class="nb">outo</span> a<span class="n">FL</span><span class="p">,</span> a<span class="n">FR</span><span class="p">,</span> a<span class="n">MFL</span><span class="p">,</span> a<span class="n">MFR</span><span class="p">,</span> a<span class="n">MBL</span><span class="p">,</span> a<span class="n">MBR</span><span class="p">,</span> a<span class="n">BL</span><span class="p">,</span> a<span class="n">BR</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">30</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="idm281472875081592"></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="idm281472875079480"></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">
<a id="idm281472875070648"></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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