X-Git-Url: https://scm.cri.ensmp.fr/git/Faustine.git/blobdiff_plain/c7f552fd8888da2f0d8cfb228fe0f28d3df3a12c..b4b6f2ea75b9f0f3ca918f5b84016610bf7a4d4f:/interpretor/preprocessor/faust-0.9.47mr3/tools/faust2pd/examples/seqdemo/karplusplus.dsp

diff --git a/interpretor/preprocessor/faust-0.9.47mr3/tools/faust2pd/examples/seqdemo/karplusplus.dsp b/interpretor/preprocessor/faust-0.9.47mr3/tools/faust2pd/examples/seqdemo/karplusplus.dsp
new file mode 100644
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+++ b/interpretor/preprocessor/faust-0.9.47mr3/tools/faust2pd/examples/seqdemo/karplusplus.dsp
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+
+declare name "karplusplus -- Karplus-Strong + Fuzz";
+declare author "Yann Orlarey, Albert Graef";
+declare version "1.0";
+
+import("music.lib");
+
+// control variables
+
+// master volume and pan
+vol	= hslider("vol", 0.3, 0, 10, 0.01);	// %
+pan	= hslider("pan", 0.5, 0, 1, 0.01);	// %
+
+// excitator and resonator parameters
+size	= hslider("samples", 512, 1, 1024, 1);	// #samples
+dtime	= hslider("decay time", 4, 0, 10, 0.01);// -60db decay time
+
+// fuzz parameters
+drive	= hslider("drive", 0, 0, 50, 0.1);	// overdrive factor
+res	= hslider("res", 0, 0, 20, 0.1);	// filter resonance
+tone	= hslider("tone", 20, 1, 20, 0.1);	// filter cutoff harmonic
+level	= hslider("level", 1, 0, 10, 0.01);	// output gain (%)
+
+// voice parameters
+freq	= nentry("freq", 440, 20, 20000, 1);	// Hz
+gain	= nentry("gain", 1, 0, 10, 0.01);	// %
+gate	= button("gate");			// 0/1
+
+/* The excitator: */
+
+upfront(x) 	= (x-x') > 0.0;
+decay(n,x)	= x - (x>0)/n;
+release(n)	= + ~ decay(n);
+trigger(n) 	= upfront : release(n) : >(0.0) : +(leak);
+leak		= 1.0/65536.0; // avoid denormals on Pentium
+excitator	= trigger(size);
+
+/* The resonator: */
+
+average(x)	= (x+x')/2;
+att(d,t)	= 1-1/pow(db2linear(60), d/(SR*t));
+comb(d,a)	= (+ : fdelay(4096, d-1.5)) ~ (average : *(1.0-a));
+resonator(d)	= comb(d,att(d,dtime));
+
+/* DC blocker (see http://ccrma.stanford.edu/~jos/filters/DC_Blocker.html): */
+
+dcblocker(x)	= (x-x') : (+ ~ *(0.995));
+
+// resonant lowpass
+
+// This is a tweaked Butterworth filter by David Werner and Patrice Tarrabia,
+// see http://www.musicdsp.org and http://www.experimentalscene.com for
+// details.
+
+// res = resonance in dB above DC gain
+// freq = cutoff frequency
+
+lowpass(res,freq)	= f : (+ ~ g) : *(a)
+with {
+	f(x)	= a0*x+a1*x'+a2*x'';
+	g(y)	= 0-b1*y-b2*y';
+	a	= 1/db2linear(0.5*res);
+
+	c	= 1.0/tan(PI*(freq/SR));
+	c2	= c*c;
+	r	= 1/db2linear(2.0*res);
+	q	= sqrt(2.0)*r;
+	a0	= 1.0/(1.0+(q*c)+(c2));
+	a1	= 2.0*a0;
+	a2	= a0;
+	b1	= 2.0*a0*(1.0-c2);
+	b2	= a0*(1.0-q*c+c2);
+};
+
+/* Fuzz effect. */
+
+clip(x)		= f*x+1-f with { f = abs(drive*x)<=1; };
+fuzz(freq)	= clip : lowpass(res,tone*freq) : *(level);
+
+/* Karplus-Strong string synthesizer: */
+
+process	= vgroup("1-excitator", noise*gain : *(gate : excitator))
+	: vgroup("2-resonator", resonator(SR/freq)) : dcblocker
+        : vgroup("3-fuzz", fuzz(freq))
+        : vgroup("4-master", *(vol) : panner(pan));