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<div class="refentry" title="GEN52">
<a id="GEN52"></a>
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<div class="refnamediv">
<h2>
<span class="refentrytitle">GEN52</span>
</h2>
<p>GEN52 —
Creates an interleaved multichannel table from the specified
source tables, in the format expected by the <span class="emphasis"><em>ftconv</em></span> opcode.
</p>
</div>
<div class="refsect1" title="Description">
<a id="idp78492080"></a>
<h2>Description</h2>
<p>
GEN52 creates an interleaved multichannel table from the specified
source tables, in the format expected by the <a class="link" href="ftconv.html" title="ftconv"><em class="citetitle">ftconv</em></a> opcode.
It can also be used to extract a channel from a multichannel table
and store it in a normal mono table, copy tables with skipping some
samples, adding delay, or store in reverse order, etc.
</p>
<p>
Three parameters must be given for each channel to be processed. <span class="emphasis"><em>fsrc</em></span> declares the source f-table number. The parameter <span class="emphasis"><em>offset</em></span> specifies an offset for the source file. If different to 0, the source file is not read from the beginning, but the <span class="emphasis"><em>offset</em></span> number of values are skipped. The <span class="emphasis"><em>offset</em></span> is used to determine the channel number to be read from interleaved f-tables, e.g. for channel 2, <span class="emphasis"><em>offset</em></span> must be 1. It can also be used to set a read offset on the source table. This parameter gives absolute values, so if a skip of 20 sample frames for a 2 channel f-table is desired, <span class="emphasis"><em>offset</em></span> must be set to 40. The <span class="emphasis"><em>srcchnls</em></span> parameter is used to declare the number of channels in the source f-table. This parameter sets the skip size when reading the source f-table.
</p>
<p>
When more than one channel (<span class="emphasis"><em>nchannels</em></span> > 1) is given, source f-tables are interleaved in the newly created table.
</p>
<p>
If the source f-table is finished before the destination f-table is full, the remaining values are set to 0.
</p>
</div>
<div class="refsect1" title="Syntax">
<a id="idp78499016"></a>
<h2>Syntax</h2>
<pre class="synopsis"><span class="command"><strong>f</strong></span> # time size 52 nchannels fsrc1 offset1 srcchnls1 [fsrc2 offset2 srcchnls2 ... fsrcN offsetN srcchnlsN]</pre>
</div>
<div class="refsect1" title="Example">
<a id="idp78548928"></a>
<h2>Example</h2>
<pre class="programlisting">
<span class="comment">; source tables</span>
<span class="stamnt">f</span> 1 0 16384 10 1
<span class="stamnt">f</span> 2 0 16384 10 0 1
<span class="comment">; create 2 channel interleaved table</span>
<span class="stamnt">f</span> 3 0 32768 -52 2 1 0 1 2 0 1
<span class="comment">; extract first channel from table 3</span>
<span class="stamnt">f</span> 4 0 16384 -52 1 3 0 2
<span class="comment">; extract second channel from table 3</span>
<span class="stamnt">f</span> 5 0 16384 -52 1 3 1 2</pre>
<p>
Here is a complete example of the GEN52 opcode. It uses the file <a class="ulink" href="examples/gen52.csd" target="_top"><em class="citetitle">gen52.csd</em></a>.
</p>
<div class="example">
<a id="idp78553424"></a>
<p class="title">
<strong>Example 1072. Example of the GEN52 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>
-odac <span class="comment">;;;realtime audio out</span>
<span class="comment">;-iadc ;;;uncomment -iadc if realtime audio input is needed too</span>
<span class="comment">; For Non-realtime ouput leave only the line below:</span>
<span class="comment">; -o gen52.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> 44100
<span class="ohdr">ksmps</span> <span class="op">=</span> 32
<span class="ohdr">nchnls</span> <span class="op">=</span> 2
<span class="ohdr">0dbfs</span> <span class="op">=</span> 1
garvb <span class="opc">init</span> 0
gaW <span class="opc">init</span> 0
gaX <span class="opc">init</span> 0
gaY <span class="opc">init</span> 0
itmp <span class="ohdr">ftgen</span> 1, 0, 64, <span class="op">-</span>2, 2, 40, <span class="op">-</span>1, <span class="op">-</span>1, <span class="op">-</span>1, 123, \
1, 13.000, 0.05, 0.85, 20000.0, 0.0, 0.50, 2, \
1, 2.000, 0.05, 0.85, 20000.0, 0.0, 0.25, 2, \
1, 16.000, 0.05, 0.85, 20000.0, 0.0, 0.35, 2, \
1, 9.000, 0.05, 0.85, 20000.0, 0.0, 0.35, 2, \
1, 12.000, 0.05, 0.85, 20000.0, 0.0, 0.35, 2, \
1, 8.000, 0.05, 0.85, 20000.0, 0.0, 0.35, 2
itmp <span class="ohdr">ftgen</span> 2, 0, 262144, <span class="op">-</span>2, 0
<span class="opc">spat3dt</span> 2, <span class="op">-</span>0.2, 1, 0, 1, 1, 2, 0.005
itmp <span class="ohdr">ftgen</span> 3, 0, 262144, <span class="op">-</span>52, 3, 2, 0, 4, 2, 1, 4, 2, 2, 4
<span class="oblock">instr</span> 1
a1 <span class="opc">vco2</span> 1, 440, 10
kfrq <span class="opc">port</span> 100, 0.008, 20000
a1 <span class="opc">butterlp</span> a1, kfrq
a2 <span class="opc">linseg</span> 0, 0.003, 1, 0.01, 0.7, 0.005, 0, 1, 0
a1 <span class="op">=</span> a1 <span class="op">*</span> a2 <span class="op">*</span> 2
<span class="opc">denorm</span> a1
<span class="opc">vincr</span> garvb, a1
aw, ax, ay, az <span class="opc">spat3di</span> a1, p4, p5, p6, 1, 1, 2
<span class="opc">vincr</span> gaW, aw
<span class="opc">vincr</span> gaX, ax
<span class="opc">vincr</span> gaY, ay
<span class="oblock">endin</span>
<span class="oblock">instr</span> 2
<span class="opc">denorm</span> garvb
<span class="comment">; skip as many samples as possible without truncating the IR</span>
arW, arX, arY <span class="opc">ftconv</span> garvb, 3, 2048, 2048, (65536 <span class="op">-</span> 2048)
aW <span class="op">=</span> gaW <span class="op">+</span> arW
aX <span class="op">=</span> gaX <span class="op">+</span> arX
aY <span class="op">=</span> gaY <span class="op">+</span> arY
garvb <span class="op">=</span> 0
gaW <span class="op">=</span> 0
gaX <span class="op">=</span> 0
gaY <span class="op">=</span> 0
aWre, aWim <span class="opc">hilbert</span> aW
aXre, aXim <span class="opc">hilbert</span> aX
aYre, aYim <span class="opc">hilbert</span> aY
aWXr <span class="op">=</span> 0.0928<span class="op">*</span>aXre <span class="op">+</span> 0.4699<span class="op">*</span>aWre
aWXiYr <span class="op">=</span> 0.2550<span class="op">*</span>aXim <span class="op">-</span> 0.1710<span class="op">*</span>aWim <span class="op">+</span> 0.3277<span class="op">*</span>aYre
aL <span class="op">=</span> aWXr <span class="op">+</span> aWXiYr
aR <span class="op">=</span> aWXr <span class="op">-</span> aWXiYr
<span class="opc">outs</span> aL, aR
<span class="oblock">endin</span>
<span class="csdtag"></CsInstruments></span>
<span class="csdtag"><CsScore></span>
<span class="stamnt">i</span> 1 0 0.5 0.0 2.0 -0.8
<span class="stamnt">i</span> 1 1 0.5 1.4 1.4 -0.6
<span class="stamnt">i</span> 1 2 0.5 2.0 0.0 -0.4
<span class="stamnt">i</span> 1 3 0.5 1.4 -1.4 -0.2
<span class="stamnt">i</span> 1 4 0.5 0.0 -2.0 0.0
<span class="stamnt">i</span> 1 5 0.5 -1.4 -1.4 0.2
<span class="stamnt">i</span> 1 6 0.5 -2.0 0.0 0.4
<span class="stamnt">i</span> 1 7 0.5 -1.4 1.4 0.6
<span class="stamnt">i</span> 1 8 0.5 0.0 2.0 0.8
<span class="stamnt">i</span> 2 0 10
<span class="stamnt">e</span>
<span class="csdtag"></CsScore></span>
<span class="csdtag"></CsoundSynthesizer></span>
</pre>
</div>
</div>
<p><br class="example-break" />
<span>This is the diagram of the waveform of the GEN52 routine, as used in the example:</span>
</p>
<div class="mediaobject">
<img src="images/gen52.png" alt="f 3 0 262144 -52 3 2 0 4 2 1 4 2 2 4" />
<div class="caption">
<p>f 3 0 262144 -52 3 2 0 4 2 1 4 2 2 4</p>
</div>
</div>
<p>
</p>
</div>
<div class="refsect1" title="Credits">
<a id="idp78557784"></a>
<h2>Credits</h2>
<p>Author: Istvan Varga</p>
</div>
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