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<div class="refentry" title="spsend">
<a id="spsend"></a>
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<h2>
<span class="refentrytitle">spsend</span>
</h2>
<p>spsend —
Generates output signals based on a previously defined <span class="emphasis"><em>space</em></span> opcode.
</p>
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<div class="refsect1" title="Description">
<a id="idp45173176"></a>
<h2>Description</h2>
<p>
<span class="emphasis"><em>spsend</em></span> depends upon the existence of a previously defined <a class="link" href="space.html" title="space"><em class="citetitle">space</em></a>. The output signals from <span class="emphasis"><em>spsend</em></span> are derived from the values given for xy and reverb in the <span class="emphasis"><em>space</em></span> and are ready to be sent to local or global reverb units (see example below).
</p>
</div>
<div class="refsect1" title="Syntax">
<a id="idp45184496"></a>
<h2>Syntax</h2>
<pre class="synopsis">a1, a2, a3, a4 <span class="command"><strong>spsend</strong></span></pre>
</div>
<div class="refsect1" title="Performance">
<a id="idp45185480"></a>
<h2>Performance</h2>
<p>
The configuration of the xy coordinates in space places the signal in the following way:
</p>
<div class="itemizedlist">
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<li class="listitem">
<p>a1 is -1, 1</p>
</li>
<li class="listitem">
<p>a2 is 1, 1</p>
</li>
<li class="listitem">
<p>a3 is -1, -1</p>
</li>
<li class="listitem">
<p>a4 is 1, -1</p>
</li>
</ul>
</div>
<p>
</p>
<p>
This assumes a loudspeaker set up as a1 is left front, a2 is right front, a3 is left back, a4 is right back. Values greater than 1 will result in sounds being attenuated, as if in the distance. <span class="emphasis"><em>space</em></span> considers the speakers to be at a distance of 1; smaller values of xy can be used, but <span class="emphasis"><em>space</em></span> will not amplify the signal in this case. It will, however balance the signal so that it can sound as if it were within the 4 speaker <span class="emphasis"><em>space</em></span>. x=0, y=1, will place the signal equally balanced between left and right front channels, x=y=0 will place the signal equally in all 4 channels, and so on. Although there must be 4 output signals from <span class="emphasis"><em>space</em></span>, it can be used in a 2 channel orchestra. If the xy's are kept so that Y>=1, it should work well to do panning and fixed localization in a stereo field.
</p>
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<div class="refsect1" title="Examples">
<a id="idp45220216"></a>
<h2>Examples</h2>
<p>
Here is a stereo example of the spsend opcode. It uses the file <a class="ulink" href="examples/spsend.csd" target="_top"><em class="citetitle">spsend.csd</em></a>.
</p>
<div class="example">
<a id="idp45221192"></a>
<p class="title">
<strong>Example 792. Example of the spsend 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 spsend.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">0dbfs</span> <span class="op">=</span> 1
<span class="ohdr">nchnls</span> <span class="op">=</span> 2 <span class="comment">;stereo output</span>
ga1 <span class="opc">init</span> 0
ga2 <span class="opc">init</span> 0
<span class="oblock">instr</span> 1 <span class="comment">;sends different amounts to reverb</span>
irev <span class="op">=</span> p6
asig <span class="opc">diskin2</span> "fox.wav", 1
a1, a2, a3, a4 <span class="opc">space</span> asig, 0, 0, irev, p4, p5 <span class="comment">;take position values from p4, p5</span>
ar1, ar2, ar3, ar4 <span class="opc">spsend</span> <span class="comment">;send to reverb</span>
ga1 <span class="op">=</span> ga1<span class="op">+</span>ar1
ga2 <span class="op">=</span> ga2<span class="op">+</span>ar2
<span class="opc">outs</span> a1, a2
<span class="oblock">endin</span>
<span class="oblock">instr</span> 99 <span class="comment">; reverb instrument</span>
a1 <span class="opc">reverb2</span> ga1, 2.5, .5
a2 <span class="opc">reverb2</span> ga2, 2.5, .5
<span class="opc">outs</span> a1, a2
ga1<span class="op">=</span>0
ga2<span class="op">=</span>0
<span class="oblock">endin</span>
<span class="csdtag"></CsInstruments></span>
<span class="csdtag"><CsScore></span>
<span class="comment">;WITH REVERB</span>
<span class="comment">;place the sound in the left speaker and near</span>
<span class="stamnt">i</span>1 0 1 -1 1 .1
<span class="comment">;place the sound in the right speaker and far</span>
<span class="stamnt">i</span>1 1 1 45 45 .1
<span class="comment">;place the sound equally between left and right and in the middle ground distance</span>
<span class="stamnt">i</span>1 2 1 0 12 .1
<span class="comment">;NO REVERB</span>
<span class="comment">;place the sound in the left speaker and near</span>
<span class="stamnt">i</span>1 6 1 -1 1 0
<span class="comment">;place the sound in the right speaker and far</span>
<span class="stamnt">i</span>1 7 1 45 45 0
<span class="comment">;place the sound equally between left and right and in the middle ground distance</span>
<span class="stamnt">i</span>1 8 1 0 12 0
<span class="stamnt">i</span> 99 0 12 <span class="comment">;keep reverb active all the time</span>
<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="idp45223464"></a>
<h2>See Also</h2>
<p>
<a class="link" href="space.html" title="space"><em class="citetitle">space</em></a>,
<a class="link" href="spdist.html" title="spdist"><em class="citetitle">spdist</em></a>
</p>
</div>
<div class="refsect1" title="Credits">
<a id="idp45224960"></a>
<h2>Credits</h2>
<p>
</p>
<table border="0" summary="Simple list" class="simplelist">
<tr>
<td>Author: Richard Karpen</td>
</tr>
<tr>
<td>Seattle, WA USA</td>
</tr>
<tr>
<td>1998</td>
</tr>
</table>
<p>
</p>
<p>New in Csound version 3.48</p>
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