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<div class="refentry" title="cross2">
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<h2>
<span class="refentrytitle">cross2</span>
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<p>cross2 —
Cross synthesis using FFT's.
</p>
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<div class="refsect1" title="Description">
<a id="idp17189752"></a>
<h2>Description</h2>
<p>
This is an implementation of cross synthesis using FFT's.
</p>
</div>
<div class="refsect1" title="Syntax">
<a id="idp17190504"></a>
<h2>Syntax</h2>
<pre class="synopsis">ares <span class="command"><strong>cross2</strong></span> ain1, ain2, isize, ioverlap, iwin, kbias</pre>
</div>
<div class="refsect1" title="Initialization">
<a id="idp17201024"></a>
<h2>Initialization</h2>
<p>
<span class="emphasis"><em>isize</em></span> -- This is the size of the FFT to be performed. The larger the size the better the frequency response but a sloppy time response.
</p>
<p>
<span class="emphasis"><em>ioverlap</em></span> -- This is the overlap factor of the FFT's, must be a power of two. The best settings are 2 and 4. A big overlap takes a long time to compile.
</p>
<p>
<span class="emphasis"><em>iwin</em></span> -- This is the function table that contains the window to be used in the analysis. One can use the <a class="link" href="GEN20.html" title="GEN20"><em class="citetitle">GEN20</em></a> routine to create this window.
</p>
</div>
<div class="refsect1" title="Performance">
<a id="idp17245960"></a>
<h2>Performance</h2>
<p>
<span class="emphasis"><em>ain1</em></span> -- The stimulus sound. Must have high frequencies for best results.
</p>
<p>
<span class="emphasis"><em>ain2</em></span> -- The modulating sound. Must have a moving frequency response (like speech) for best results.
</p>
<p>
<span class="emphasis"><em>kbias</em></span> -- The amount of cross synthesis. 1 is the normal, 0 is no cross synthesis.
</p>
</div>
<div class="refsect1" title="Examples">
<a id="idp17248160"></a>
<h2>Examples</h2>
<p>
Here is an example of the cross2 opcode. It uses the file <a class="ulink" href="examples/cross2.csd" target="_top"><em class="citetitle">cross2.csd</em></a> and <a class="ulink" href="examples/fox.wav" target="_top"><em class="citetitle">fox.wav</em></a>.
</p>
<div class="example">
<a id="idp17249568"></a>
<p class="title">
<strong>Example 144. Example of the cross2 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">;;;RT audio out</span>
<span class="comment">;-iadc ;;;uncomment -iadc if RT audio input is needed too</span>
<span class="comment">; For Non-realtime ouput leave only the line below:</span>
<span class="comment">; -o cross2.wav -W ;;; for file output any platform</span>
<span class="csdtag"></CsOptions></span>
<span class="csdtag"><CsInstruments></span>
<span class="comment">; after example from Kevin Conder</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
<span class="oblock">instr</span> 1 <span class="comment">;play audio file</span>
aout <span class="opc">soundin</span> "fox.wav"
<span class="opc">outs</span> aout, aout
<span class="oblock">endin</span>
<span class="oblock">instr</span> 2 <span class="comment">;cross-synthesize</span>
icps <span class="op">=</span> p4
ifn <span class="op">=</span> p5 <span class="comment">; Use the "ahh.aiff" sound and "eee.aiff"</span>
ain1 <span class="opc">oscil</span> 0.6, p4, ifn
ain2 <span class="opc">soundin</span> "fox.wav" <span class="comment">; Use the "fox.wav" as modulator</span>
isize <span class="op">=</span> 4096
ioverlap <span class="op">=</span> 2
iwin <span class="op">=</span> 3
kbias <span class="opc">init</span> 1
aout <span class="opc">cross2</span> ain1, ain2, isize, ioverlap, iwin, kbias
<span class="opc">outs</span> aout, aout
<span class="oblock">endin</span>
<span class="csdtag"></CsInstruments></span>
<span class="csdtag"><CsScore></span>
<span class="comment">;audio files</span>
<span class="stamnt">f</span> 1 0 128 1 "ahh.ai<span class="stamnt">f</span><span class="stamnt">f</span>" 0 4 0
<span class="stamnt">f</span> 2 0 128 1 "eee.ai<span class="stamnt">f</span><span class="stamnt">f</span>" 0 4 0
<span class="stamnt">f</span> 3 0 2048 20 2 <span class="comment">;windowing function</span>
<span class="stamnt">i</span> 1 0 3
<span class="stamnt">i</span> 2 3 3 50 1 <span class="comment">;"eee.aiff"</span>
<span class="stamnt">i</span> 2 + 3 50 2 <span class="comment">;"ahh.aiff"</span>
<span class="stamnt">i</span> 2 + 3 100 1 <span class="comment">;"eee.aiff"</span>
<span class="stamnt">i</span> 2 + 3 100 2 <span class="comment">;"ahh.aiff"</span>
<span class="stamnt">i</span> 2 + 3 250 1 <span class="comment">;"eee.aiff"</span>
<span class="stamnt">i</span> 2 + 3 250 2 <span class="comment">;"ahh.aiff"</span>
<span class="stamnt">i</span> 2 + 3 20 1 <span class="comment">;"eee.aiff"</span>
<span class="stamnt">i</span> 2 + 3 20 2 <span class="comment">;"ahh.aiff"</span>
<span class="stamnt">e</span>
<span class="csdtag"></CsScore></span>
<span class="csdtag"></CsoundSynthesizer></span>
</pre>
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<p><br class="example-break" />
</p>
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<div class="refsect1" title="Credits">
<a id="idp17251840"></a>
<h2>Credits</h2>
<p>
</p>
<table border="0" summary="Simple list" class="simplelist">
<tr>
<td>Author: Paris Smaragdis</td>
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<td>MIT, Cambridge</td>
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<td>1997</td>
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