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<div class="refentry" title="bformdec">
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<h2>
<span class="refentrytitle">bformdec</span>
</h2>
<p>bformdec —
Deprecated. Decodes an ambisonic B format signal.
</p>
</div>
<div class="refsect1" title="Description">
<a id="idp80047360"></a>
<h2>Description</h2>
<p>
Decodes an ambisonic B format signal into loudspeaker specific signals. Note that this opcode is
deprecated as it is inaccurate, and is replaced by the much
better opcode <a class="link" href="bformdec1.html" title="bformdec1"><em class="citetitle">bformdec1</em></a> which replicates all
the important features.
</p>
</div>
<div class="refsect1" title="Syntax">
<a id="idp80058368"></a>
<h2>Syntax</h2>
<pre class="synopsis">ao1, ao2 <span class="command"><strong>bformdec</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>bformdec</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>bformdec</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>bformdec</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="idp80062360"></a>
<h2>Initialization</h2>
<p>
<span class="emphasis"><em>isetup</em></span> –- loudspeaker setup. There are
five supported setups: 1 denotes stereo setup. There must be
two output cells with loudspeaker positions assumed to be (330/0, 30/0). </p>
<p>2 denotes quad setup. There must be four output cells.
Loudspeaker positions assumed to be (45°/0), (135°/0),
(225/0), (315/0).</p>
<p>3 is a 5.1 surround setup. There must be five output
cells. LFE channel is not supported. Loudspeaker positions
assumed to be (330/0), (30/0), (0/0), (250/0), (110/0).</p>
<p> 4 denotes eight loudspeaker circle setup. There must be
eight output cells. Loudspeaker positions assumed to be
(22.5/0), (67.5/0), (112.5/0), (157.5/0), (202.5/0),
(247.5/0), (292.5/0), (337.5/0).</p>
<p> 5 means an eight loudspeaker cubic setup. There must be
eight output cells. Loudspeaker positions assumed to be
(45/0), (45/30), (135/0), (135/30), (225/0), (225/30),
(315/0), (315/30).</p>
</div>
<div class="refsect1" title="Performance">
<a id="idp80097768"></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="idp80099208"></a>
<h2>Example</h2>
<p>
Here is an example of the bformdec opcode. It uses the file <a class="ulink" href="examples/bformenc.csd" target="_top"><em class="citetitle">bformenc.csd</em></a>.
</p>
<div class="example">
<a id="idp80100200"></a>
<p class="title">
<strong>Example 1080. Example of the bformdec 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="comment">;bformenc is deprecated, please use bformenc1</span>
<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">; fade ambisonic order from 2nd to 0th during second turn</span>
kord0 <span class="op">=</span> 1
kord1 <span class="opc">linseg</span> 1, p3 <span class="op">/</span> 2, 1, p3 <span class="op">/</span> 2, 0
kord2 <span class="opc">linseg</span> 1, p3 <span class="op">/</span> 2, 1, p3 <span class="op">/</span> 2, 0
<span class="comment">; generate B format</span>
aw, ax, ay, az, ar, as, at, au, av <span class="opc">bformenc</span> anoise, kalpha, kbeta, kord0, kord1, kord2
<span class="comment">; decode B format for 8 channel circle loudspeaker setup</span>
a1, a2, a3, a4, a5, a6, a7, a8 <span class="opc">bformdec</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="Credits">
<a id="idp80102512"></a>
<h2>Credits</h2>
<p>
</p>
<table border="0" summary="Simple list" class="simplelist">
<tr>
<td>Author: Samuel Groner</td>
</tr>
<tr>
<td>2005</td>
</tr>
</table>
<p>
</p>
<p>New in version 5.07. Deprecated in 5.09</p>
</div>
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