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<p class="p1"><b>PV_MagMulAdd<span class="Apple-tab-span"> </span><span class="Apple-tab-span"> </span><span class="Apple-tab-span"> </span><span class="Apple-tab-span"> </span>simple scaling of FFT magnitudes</b></p>
<p class="p2"><br></p>
<p class="p3"><b>chain = PV_MagMulAdd(chain, mul, add)</b></p>
<p class="p2"><br></p>
<p class="p3">Applies the following simple linear transformation to every magnitude in the FFT:</p>
<p class="p2"><br></p>
<p class="p3"><span class="Apple-tab-span"> </span>mag = mag * mul + add</p>
<p class="p2"><br></p>
<p class="p3">This is probably not a very useful audio effect in itself, but may be a component of other analysis or transformation processes...</p>
<p class="p2"><br></p>
<p class="p3"><b>chain</b> - fft chain.</p>
<p class="p2"><br></p>
<p class="p4">s.boot;</p>
<p class="p5"><br></p>
<p class="p4">(</p>
<p class="p4">b = <span class="s1">Buffer</span>.alloc(s,2048,1);</p>
<p class="p6"><span class="s2">c = </span><span class="s1">Buffer</span><span class="s2">.read(s,</span>"sounds/a11wlk01.wav"<span class="s2">);</span></p>
<p class="p4">d = <span class="s1">Buffer</span>.alloc(s,2048,1);</p>
<p class="p4">)</p>
<p class="p7"><br></p>
<p class="p8">// Here, mouse left/right controls "mul", so simply amplifies;<span class="Apple-converted-space"> </span></p>
<p class="p8">//<span class="Apple-converted-space"> </span>up/down is "add", so kind of artificially raises the noise floor.</p>
<p class="p9">(</p>
<p class="p9"><span class="s3">SynthDef</span>(<span class="s4">"help-pvmagmuladd"</span>, {<span class="Apple-converted-space"> </span><span class="s3">arg</span> out=0, bufnum=0, soundBufnum=2;</p>
<p class="p9"><span class="Apple-tab-span"> </span><span class="s3">var</span> in, chain;</p>
<p class="p9"><span class="Apple-tab-span"> </span>in = <span class="s3">PlayBuf</span>.ar(1, soundBufnum, <span class="s3">BufRateScale</span>.kr(soundBufnum), loop: 1);</p>
<p class="p9"><span class="Apple-tab-span"> </span>chain = <span class="s3">FFT</span>(bufnum, in);</p>
<p class="p9"><span class="Apple-tab-span"> </span>chain = <span class="s3">PV_MagMulAdd</span>(chain, <span class="s3">MouseX</span>.kr(0,2), <span class="s3">MouseY</span>.kr(0,1));</p>
<p class="p9"><span class="Apple-tab-span"> </span><span class="s3">Out</span>.ar(out, 0.3 * <span class="s3">IFFT</span>(chain));<span class="Apple-converted-space"> </span></p>
<p class="p9">}).play(s,[<span class="s5">\out</span>, 0, <span class="s5">\bufnum</span>, b, <span class="s5">\soundBufnum</span>, c]);</p>
<p class="p9">)</p>
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