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<h2>
<span class="refentrytitle">cross2</span>
</h2>
<p>cross2 —
Cross synthesis using FFT's.
</p>
</div>
<div class="refsect1">
<a id="idm281472943977208"></a>
<h2>Description</h2>
<p>
This is an implementation of cross synthesis using FFT's.
</p>
</div>
<div class="refsect1">
<a id="idm281472943895368"></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">
<a id="idm281472943893096"></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">
<a id="idm281472943888104"></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">
<a id="idm281472943884248"></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="idm281472943881624"></a>
<p class="title">
<strong>Example 172. 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>
<div class="refsect1">
<a id="idm281472776821672"></a>
<pre class="programlisting">
<span class="nt"><CsoundSynthesizer></span>
<span class="nt"><CsOptions></span>
<span class="c1">; Select audio/midi flags here according to platform</span>
-odac <span class="c1">;;;RT audio out</span>
<span class="c1">;-iadc ;;;uncomment -iadc if RT audio input is needed too</span>
<span class="c1">; For Non-realtime ouput leave only the line below:</span>
<span class="c1">; -o cross2.wav -W ;;; for file output any platform</span>
<span class="nt"></CsOptions></span>
<span class="nt"><CsInstruments></span>
<span class="c1">; after example from Kevin Conder</span>
<span class="vg">sr</span> <span class="o">=</span> <span class="mi">44100</span>
<span class="vg">ksmps</span> <span class="o">=</span> <span class="mi">32</span>
<span class="vg">nchnls</span> <span class="o">=</span> <span class="mi">2</span>
<span class="vg">0dbfs</span> <span class="o">=</span> <span class="mi">1</span>
<span class="kd">instr</span> <span class="nf">1</span> <span class="c1">;play audio file</span>
a<span class="n">out</span> <span class="nb">soundin</span> <span class="s">"fox.wav"</span>
<span class="nb">outs</span> a<span class="n">out</span><span class="p">,</span> a<span class="n">out</span>
<span class="kd">endin</span>
<span class="kd">instr</span> <span class="nf">2</span> <span class="c1">;cross-synthesize</span>
i<span class="n">cps</span> <span class="o">=</span> <span class="nb">p4</span>
i<span class="n">fn</span> <span class="o">=</span> <span class="nb">p5</span> <span class="c1">; Use the "ahhc.aiff" sound and "eeec.aiff"</span>
a<span class="n">in1</span> <span class="nb">oscil</span> <span class="mf">0.6</span><span class="p">,</span> <span class="nb">p4</span><span class="p">,</span> i<span class="n">fn</span>
a<span class="n">in2</span> <span class="nb">soundin</span> <span class="s">"fox.wav"</span> <span class="c1">; Use the "fox.wav" as modulator</span>
i<span class="n">size</span> <span class="o">=</span> <span class="mi">4096</span>
i<span class="n">overlap</span> <span class="o">=</span> <span class="mi">2</span>
i<span class="n">win</span> <span class="o">=</span> <span class="mi">3</span>
k<span class="n">bias</span> <span class="nb">init</span> <span class="mi">1</span>
a<span class="n">out</span> <span class="nb">cross2</span> a<span class="n">in1</span><span class="p">,</span> a<span class="n">in2</span><span class="p">,</span> i<span class="n">size</span><span class="p">,</span> i<span class="n">overlap</span><span class="p">,</span> i<span class="n">win</span><span class="p">,</span> k<span class="n">bias</span>
<span class="nb">outs</span> a<span class="n">out</span><span class="p">,</span> a<span class="n">out</span>
<span class="kd">endin</span>
<span class="nt"></CsInstruments></span>
<span class="nt"><CsScore></span>
<span class="c1">;audio files</span>
<span class="nb">f</span> <span class="mi">1</span> <span class="mi">0</span> <span class="mi">128</span> <span class="mi">1</span> <span class="s">"ahhc.aiff"</span> <span class="mi">0</span> <span class="mi">4</span> <span class="mi">0</span>
<span class="nb">f</span> <span class="mi">2</span> <span class="mi">0</span> <span class="mi">128</span> <span class="mi">1</span> <span class="s">"eeec.aiff"</span> <span class="mi">0</span> <span class="mi">4</span> <span class="mi">0</span>
<span class="nb">f</span> <span class="mi">3</span> <span class="mi">0</span> <span class="mi">2048</span> <span class="mi">20</span> <span class="mi">2</span> <span class="c1">;windowing function</span>
<span class="nb">i</span> <span class="mi">1</span> <span class="mi">0</span> <span class="mi">3</span>
<span class="nb">i</span> <span class="mi">2</span> <span class="mi">3</span> <span class="mi">3</span> <span class="mi">50</span> <span class="mi">1</span> <span class="c1">;"eeec.aiff"</span>
<span class="nb">i</span> <span class="mi">2</span> <span class="o">+</span> <span class="mi">3</span> <span class="mi">50</span> <span class="mi">2</span> <span class="c1">;"ahhc.aiff"</span>
<span class="nb">i</span> <span class="mi">2</span> <span class="o">+</span> <span class="mi">3</span> <span class="mi">100</span> <span class="mi">1</span> <span class="c1">;"eeec.aiff"</span>
<span class="nb">i</span> <span class="mi">2</span> <span class="o">+</span> <span class="mi">3</span> <span class="mi">100</span> <span class="mi">2</span> <span class="c1">;"ahhc.aiff"</span>
<span class="nb">i</span> <span class="mi">2</span> <span class="o">+</span> <span class="mi">3</span> <span class="mi">250</span> <span class="mi">1</span> <span class="c1">;"eeec.aiff"</span>
<span class="nb">i</span> <span class="mi">2</span> <span class="o">+</span> <span class="mi">3</span> <span class="mi">250</span> <span class="mi">2</span> <span class="c1">;"ahhc.aiff"</span>
<span class="nb">i</span> <span class="mi">2</span> <span class="o">+</span> <span class="mi">3</span> <span class="mi">20</span> <span class="mi">1</span> <span class="c1">;"eeec.aiff"</span>
<span class="nb">i</span> <span class="mi">2</span> <span class="o">+</span> <span class="mi">3</span> <span class="mi">20</span> <span class="mi">2</span> <span class="c1">;"ahhc.aiff"</span>
<span class="nb">e</span>
<span class="nt"></CsScore></span>
<span class="nt"></CsoundSynthesizer></span>
</pre>
</div>
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<p><br class="example-break" />
</p>
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<div class="refsect1">
<a id="idm281472943877432"></a>
<h2>Credits</h2>
<p>
</p>
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<td>Author: Paris Smaragdis</td>
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<td>MIT, Cambridge</td>
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<td>1997</td>
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