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<h2>
<span class="refentrytitle">bformdec1</span>
</h2>
<p>bformdec1 —
Decodes an ambisonic B format signal
</p>
</div>
<div class="refsect1" title="Description">
<a id="idp14740888"></a>
<h2>Description</h2>
<p>
Decodes an ambisonic B format signal into loudspeaker specific signals.
</p>
</div>
<div class="refsect1" title="Syntax">
<a id="idp14741688"></a>
<h2>Syntax</h2>
<pre class="synopsis">ao1, ao2 <span class="command"><strong>bformdec1</strong></span> isetup, aw, ax, ay, az [, ar, as, at, au, av \
[, abk, al, am, an, ao, ap, aq]]</pre>
<pre class="synopsis">ao1, ao2, ao3, ao4 <span class="command"><strong>bformdec1</strong></span> isetup, aw, ax, ay, az [, ar, as, at, \
au, av [, abk, al, am, an, ao, ap, aq]]</pre>
<pre class="synopsis">ao1, ao2, ao3, ao4, ao5 <span class="command"><strong>bformdec1</strong></span> isetup, aw, ax, ay, az [, ar, as, \
at, au, av [, abk, al, am, an, ao, ap, aq]]</pre>
<pre class="synopsis">ao1, ao2, ao3, ao4, ao5, ao6, ao7, ao8 <span class="command"><strong>bformdec1</strong></span> isetup, aw, ax, ay, az \
[, ar, as, at, au, av [, abk, al, am, an, ao, ap, aq]]]</pre>
</div>
<div class="refsect1" title="Initialization">
<a id="idp14754960"></a>
<h2>Initialization</h2>
<p>
Note that horizontal angles are measured anticlockwise in this
description.
</p>
<p>
<span class="emphasis"><em>isetup</em></span> –- loudspeaker setup. There are
five supported setups:
</p>
<div class="itemizedlist">
<ul class="itemizedlist" type="disc">
<li class="listitem">1. Stereo - L(90), R(-90); this is an M+S style stereo decode.</li>
<li class="listitem">2. Quad - FL(45), BL(135), BR(-135), FR(-45).
This is a first-order `in-phase' decode.</li>
<li class="listitem">3. 5.0 - L(30),R(-30),C(0),BL(110),BR(-110).
Note that many people do not actually use the angles above for
their speaker arrays and a good decode for DVD etc can be
achieved using the Quad configuration to feed L, R, BL and BR
(leaving C silent).</li>
<li class="listitem">4. Octagon - FFL(22.5),FLL(67.5),BLL(112.5),BBL(157.5),BBR(-157.5),BRR(-112.5),FRR(-67.5),FFR(-22.5).
This is a first-, second- or third-order `in-phase' decode,
depending on the number of input channels.</li>
<li class="listitem">5. Cube - FLD(45,-35.26),FLU(45,35.26),BLD(135,-35.26),BLU(135,35.26),BRD(-135,-35.26),BRU(-135,35.26),FRD(-45,-35.26),FRU(-45,35.26).
This is a first-order `in-phase' decode.</li>
</ul>
</div>
<p>
</p>
</div>
<div class="refsect1" title="Performance">
<a id="idp14795072"></a>
<h2>Performance</h2>
<p>
<span class="emphasis"><em>aw, ax, ay, ... </em></span>
-- input signal in the B format.
</p>
<p>
<span class="emphasis"><em>ao1 .. ao8</em></span> -– loudspeaker specific output signals.
</p>
</div>
<div class="refsect1" title="Example">
<a id="idp14796560"></a>
<h2>Example</h2>
<p>
Here is an example of the bformdec1 opcode. It uses the file <a class="ulink" href="examples/bformenc1.csd" target="_top"><em class="citetitle">bformenc1.csd</em></a>.
</p>
<div class="example">
<a id="idp14797560"></a>
<p class="title">
<strong>Example 79. Example of the bformdec1 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 No messages</span>
<span class="comment">;-odac -iadc -d ;;;RT audio I/O</span>
<span class="comment">; For Non-realtime ouput leave only the line below:</span>
-o bformenc.wav -W <span class="comment">;;; 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">kr</span> <span class="op">=</span> 4410
<span class="ohdr">ksmps</span> <span class="op">=</span> 10
<span class="ohdr">nchnls</span> <span class="op">=</span> 8
<span class="oblock">instr</span> 1
<span class="comment">; generate pink noise</span>
anoise <span class="opc">pinkish</span> 1000
<span class="comment">; two full turns</span>
kalpha <span class="opc">line</span> 0, p3, 720
kbeta <span class="op">=</span> 0
<span class="comment">; generate B format</span>
aw, ax, ay, az, ar, as, at, au, av <span class="opc">bformenc1</span> anoise, kalpha, kbeta
<span class="comment">; decode B format for 8 channel circle loudspeaker setup</span>
a1, a2, a3, a4, a5, a6, a7, a8 <span class="opc">bformdec1</span> 4, aw, ax, ay, az, ar, as, at, au, av
<span class="comment">; write audio out</span>
<span class="opc">outo</span> a1, a2, a3, a4, a5, a6, a7, a8
<span class="oblock">endin</span>
<span class="csdtag"></CsInstruments></span>
<span class="csdtag"><CsScore></span>
<span class="comment">; Play Instrument #1 for 20 seconds.</span>
<span class="stamnt">i</span> 1 0 20
<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="See Also">
<a id="idp14799872"></a>
<h2>See Also</h2>
<p>
<a class="link" href="bformenc1.html" title="bformenc1"><em class="citetitle">bformenc1</em></a>
</p>
</div>
<div class="refsect1" title="Credits">
<a id="idp14800920"></a>
<h2>Credits</h2>
<p>
</p>
<table border="0" summary="Simple list" class="simplelist">
<tr>
<td>Author: Richard Furse, Bruce Wiggins and Fons
Adriaensen, following code by Samuel Groner</td>
</tr>
<tr>
<td>2008</td>
</tr>
</table>
<p>
</p>
<p>New in version 5.09</p>
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