97 lines
7.7 KiB
HTML
97 lines
7.7 KiB
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<p class="p1"><span class="s1"><b>SwitchDelay<span class="Apple-tab-span"> </span><span class="Apple-tab-span"> </span><span class="Apple-tab-span"> </span></b></span><b>feedback delay line implementing switch-and-ramp buffer jumping</b></p>
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<p class="p2"><br></p>
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<p class="p1"><b>SwitchDelay.ar(input, drylevel, wetlevel, delaytime, delayfactor, maxdelaytime, mul, add)</b></p>
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<p class="p2"><br></p>
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<p class="p1">A feedback delay line which allows moving the buffer read position using the switch-and-ramp technique</p>
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<p class="p1">as described by Miller S. Puckette in his Theory and Techniques of Electronic Music book.</p>
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<p class="p3"><span class="s2"><a href="http://crca.ucsd.edu/~msp/techniques/latest/book.pdf">http://crca.ucsd.edu/~msp/techniques/latest/book.pdf</a></span><span class="s3"> (chapter 4)</span></p>
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<p class="p2"><br></p>
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<p class="p1">Altering the buffer read position, in order to affect the perceived delay speed/timing, creates a<span class="Apple-converted-space"> </span></p>
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<p class="p1">discontinuity in the signal, typically creating unwanted audible artefacts. SwitchDelay seeks to<span class="Apple-converted-space"> </span></p>
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<p class="p1">minimize these artefacts by use of the above technique.<span class="Apple-converted-space"> </span></p>
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<p class="p2"><br></p>
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<p class="p1"><b>input</b> - a signal to be filtered</p>
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<p class="p1"><b>drylevel</b> - level of dry signal (default: 1.0)</p>
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<p class="p1"><b>wetlevel</b> - level of delayed signal (default: 1.0)</p>
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<p class="p1"><b>delaytime</b> - seconds to delay signal (default: 1.0)</p>
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<p class="p1"><b>delayfactor</b> - multiplier for feedback level, affects the length of the feedback tail (default 0.7)</p>
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<p class="p1"><span class="Apple-converted-space"> <span class="Apple-tab-span"> </span><span class="Apple-tab-span"> </span><span class="Apple-tab-span"> </span><span class="Apple-tab-span"> </span><span class="Apple-tab-span"> </span></span>limited slightly below 1.0 to avoid speaker damaging mistakes</p>
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<p class="p1"><b>maxdelaytime</b> - buffer size (default 20.0)</p>
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<p class="p2"><br></p>
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<p class="p1"><b><span class="Apple-converted-space"> </span>See also:</b> <a href="../../../../Applications/SuperCollider3/build/Help/UGens/Delays/CombN.html"><span class="s4">CombN</span></a><span class="s4"> </span>etc</p>
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<p class="p4"><br></p>
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<p class="p5"><br></p>
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<p class="p6">// before anything else</p>
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<p class="p7">s = <span class="s5">Server</span>.local.boot;</p>
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<p class="p8"><span class="s3">b = </span><span class="s5">Buffer</span><span class="s3">.read(s, </span>"sounds/a11wlk01.wav"<span class="s3">);</span></p>
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<p class="p5"><br></p>
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<p class="p5"><br></p>
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<p class="p6">// simple feedback delay</p>
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<p class="p7">(</p>
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<p class="p7"><span class="s5">SynthDef</span>(<span class="s6">'help-switchdelay-1'</span>, { <span class="s5">arg</span> out=0, bufnum;</p>
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<p class="p7"><span class="Apple-tab-span"> </span><span class="s5">Out</span>.ar(out,</p>
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<p class="p9"><span class="s3"><span class="Apple-tab-span"> </span><span class="Apple-tab-span"> </span></span>SwitchDelay<span class="s3">.ar(</span></p>
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<p class="p7"><span class="Apple-tab-span"> </span><span class="Apple-tab-span"> </span><span class="Apple-tab-span"> </span><span class="s5">PlayBuf</span>.ar(numChannels: 1, bufnum: bufnum, loop: 0) * 0.5,</p>
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<p class="p7"><span class="Apple-tab-span"> </span><span class="Apple-tab-span"> </span><span class="Apple-tab-span"> </span>delaytime: 0.2,</p>
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<p class="p7"><span class="Apple-tab-span"> </span><span class="Apple-tab-span"> </span><span class="Apple-tab-span"> </span>delayfactor: 0.85,</p>
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<p class="p7"><span class="Apple-tab-span"> </span><span class="Apple-tab-span"> </span><span class="Apple-tab-span"> </span>wetlevel: 0.7</p>
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<p class="p7"><span class="Apple-tab-span"> </span><span class="Apple-tab-span"> </span>)</p>
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<p class="p7"><span class="Apple-tab-span"> </span>);</p>
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<p class="p7">}).send(s);</p>
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<p class="p7">)</p>
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<p class="p5"><br></p>
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<p class="p10"><span class="s3">x = </span><span class="s5">Synth</span><span class="s3">(</span>'help-switchdelay-1'<span class="s3">, [</span>\bufnum<span class="s3">, b]);</span></p>
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<p class="p7">x.free;</p>
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<p class="p5"><br></p>
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<p class="p5"><br></p>
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<p class="p6">// this time, change the buffer read pointer periodically.</p>
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<p class="p7">(</p>
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<p class="p7"><span class="s5">SynthDef</span>(<span class="s6">'help-switchdelay-2'</span>, { <span class="s5">arg</span> out=0, bufnum, delaytime;</p>
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<p class="p7"><span class="Apple-tab-span"> </span><span class="s5">Out</span>.ar(out,</p>
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<p class="p9"><span class="s3"><span class="Apple-tab-span"> </span><span class="Apple-tab-span"> </span></span>SwitchDelay<span class="s3">.ar(</span></p>
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<p class="p7"><span class="Apple-tab-span"> </span><span class="Apple-tab-span"> </span><span class="Apple-tab-span"> </span><span class="s5">PlayBuf</span>.ar(numChannels: 1, bufnum: bufnum, loop: 0) * 0.5,</p>
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<p class="p7"><span class="Apple-tab-span"> </span><span class="Apple-tab-span"> </span><span class="Apple-tab-span"> </span>wetlevel: 0.6,</p>
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<p class="p7"><span class="Apple-tab-span"> </span><span class="Apple-tab-span"> </span><span class="Apple-tab-span"> </span>delaytime: <span class="s5">Select</span>.kr(</p>
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<p class="p7"><span class="Apple-tab-span"> </span><span class="Apple-tab-span"> </span><span class="Apple-tab-span"> </span><span class="Apple-tab-span"> </span><span class="s5">Stepper</span>.kr(<span class="s5">Impulse</span>.kr(0.5), 0, 0, 3),</p>
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<p class="p7"><span class="Apple-tab-span"> </span><span class="Apple-tab-span"> </span><span class="Apple-tab-span"> </span><span class="Apple-tab-span"> </span>#[ 0.02, 0.1, 0.725, 0.25 ]<span class="Apple-converted-space"> </span></p>
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<p class="p7"><span class="Apple-tab-span"> </span><span class="Apple-tab-span"> </span><span class="Apple-tab-span"> </span>)</p>
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<p class="p7"><span class="Apple-tab-span"> </span><span class="Apple-tab-span"> </span>)</p>
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<p class="p7"><span class="Apple-tab-span"> </span>);</p>
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<p class="p7">}).send(s);</p>
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<p class="p7">)</p>
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<p class="p5"><br></p>
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<p class="p10"><span class="s3">x = </span><span class="s5">Synth</span><span class="s3">(</span>'help-switchdelay-2'<span class="s3">, [</span>\bufnum<span class="s3">, b, </span>\loop<span class="s3">, 0, </span>\delaytime<span class="s3">, 2.0]);</span></p>
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<p class="p7">x.free;</p>
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<p class="p5"><br></p>
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</body>
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