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

diff --git a/interpretor/preprocessor/faust-0.9.47mr3/tools/faust2pd/examples/synth/chimes.syn b/interpretor/preprocessor/faust-0.9.47mr3/tools/faust2pd/examples/synth/chimes.syn
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+
+/* A simple "chimes" patch, using a bank of resonz filters (cf. Steiglitz, DSP
+   Primer, pp. 89f.). */
+
+declare name "chimes -- chimes synth using a bank of resonz filters";
+declare author "Albert Graef";
+declare version "2.0";
+
+import("music.lib");
+
+/* Control variables: */
+
+// master volume, pan
+vol		= hslider("vol", 0.5, 0, 10, 0.01);		// %
+pan		= hslider("pan", 0.5, 0, 1, 0.01);		// %
+
+// excitator and resonator parameters
+
+// excitator decay time [sec]
+xdecay		= nentry("decay", 0.01, 0, 1, 0.001);
+
+// resonator #0
+hrm0		= nentry("harmonic0", 1, 0, 50, 0.001);		// harmonic
+amp0		= nentry("amplitude0", 0.167, 0, 1, 0.001);	// amplitude
+decay0		= nentry("decay0", 3.693, 0, 10, 0.001);	// decay time
+rq0		= nentry("rq0", 0.002, 0, 1, 0.0001);		// filter 1/Q
+// resonator #1
+hrm1		= nentry("harmonic1", 3.007, 0, 50, 0.001);	// harmonic
+amp1		= nentry("amplitude1", 0.083, 0, 1, 0.001);	// amplitude
+decay1		= nentry("decay1", 2.248, 0, 10, 0.001);	// decay time
+rq1		= nentry("rq1", 0.002, 0, 1, 0.0001);		// filter 1/Q
+// resonator #2
+hrm2		= nentry("harmonic2", 4.968, 0, 50, 0.001);	// harmonic
+amp2		= nentry("amplitude2", 0.087, 0, 1, 0.001);	// amplitude
+decay2		= nentry("decay2", 2.828, 0, 10, 0.001);	// decay time
+rq2		= nentry("rq2", 0.002, 0, 1, 0.0001);		// filter 1/Q
+// resonator #3
+hrm3		= nentry("harmonic3", 8.994, 0, 50, 0.001);	// harmonic
+amp3		= nentry("amplitude3", 0.053, 0, 1, 0.001);	// amplitude
+decay3		= nentry("decay3", 3.364, 0, 10, 0.001);	// decay time
+rq3		= nentry("rq3", 0.002, 0, 1, 0.0001);		// filter 1/Q
+// resonator #4
+hrm4		= nentry("harmonic4", 12.006, 0, 50, 0.001);	// harmonic
+amp4		= nentry("amplitude4", 0.053, 0, 1, 0.001);	// amplitude
+decay4		= nentry("decay4", 2.488, 0, 10, 0.001);	// decay time
+rq4		= nentry("rq4", 0.002, 0, 1, 0.0001);		// filter 1/Q
+
+// frequency, gain, gate
+freq		= nentry("freq", 440, 20, 20000, 1);		// Hz
+gain		= nentry("gain", 1, 0, 10, 0.01);		// %
+gate		= button("gate");				// 0/1
+
+/* Definition of the resonz filter. This is basically a biquad filter with
+   pairs of poles near the desired resonance frequency and zeroes at -1 and
+   +1. See Steiglitz for details. */
+
+resonz(R,freq)	= f : (+ ~ g)
+with {
+	f(x)	= a*(x-x');		// feedforward function (two zeros)
+	g(y)	= 2*R*c*y - R*R*y';	// feedback function (two poles)
+	w	= 2*PI*freq/SR;		// freq in rad per sample period
+	c	= 2*R/(1+R*R)*cos(w);	// cosine of pole angle
+	s	= sqrt (1-c*c);		// sine of pole angle
+	a	= (1-R*R)*s;		// factor to normalize resonance
+};
+
+/* The excitator, a short burst of noise. */
+
+excitator(t)	= t : hgroup("1-excitator", adsr(0, xdecay, 0, 0) : *(noise));
+
+/* Bank of 5 resonators. */
+
+resonator(f,t,i,hrm,amp,decay,rq)
+		= (f,t,_) : hgroup("2-resonator-%i", g)
+with {
+	g(f,t)	= resonz(R,h)*(amp*b*env)
+	with {
+		h	= hrm*f;	// harmonic
+		B	= rq*f/SR;	// bandwidth, as fraction of sample rate
+		R	= 1-PI*B;	// resonance (pole radius)
+		b	= 1/(2*B);	// boost factor = Nyquist/bandwidth
+		env	= adsr(0, decay, 0, 0, t);	// envelop
+	};
+};
+
+resonators(f,t)	= resonator(f,t,0,hrm0,amp0,decay0,rq0)
+		+ resonator(f,t,1,hrm1,amp1,decay1,rq1)
+		+ resonator(f,t,2,hrm2,amp2,decay2,rq2)
+		+ resonator(f,t,3,hrm3,amp3,decay3,rq3)
+		+ resonator(f,t,4,hrm4,amp4,decay4,rq4);
+
+/* The synth. */
+
+process		= excitator(gate)*gain <: resonators(freq, gate)
+		: vgroup("3-master", *(vol) : panner(pan));