X-Git-Url: https://scm.cri.ensmp.fr/git/Faustine.git/blobdiff_plain/1059e1cc0c2ecfa237406949aa26155b6a5b9154..66f23d4fabf89ad09adbd4dfc15ac6b5b2b7da83:/interpreter/preprocessor/faust-0.9.47mr3/tools/faust2pd/examples/synth/flanger.dsp

diff --git a/interpreter/preprocessor/faust-0.9.47mr3/tools/faust2pd/examples/synth/flanger.dsp b/interpreter/preprocessor/faust-0.9.47mr3/tools/faust2pd/examples/synth/flanger.dsp
new file mode 100644
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+++ b/interpreter/preprocessor/faust-0.9.47mr3/tools/faust2pd/examples/synth/flanger.dsp
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+
+/* Stereo flanger with feedback. */
+
+/* This is basically just a chorus with a different kind of LFO (triangle wave
+   instead of sine), smaller delay times (typically 1-10 ms instead of 20-30
+   ms) and (much) larger sweep depth, which makes this unit sound more like a
+   time-varying filter (in fact, that's just what it is), in contrast to the
+   gentle pitch modulation produced by a chorus.
+
+   There's also an additional feedback loop which can be used to produce
+   metallic sounds, and a stereo control which allows you to change the
+   stereo spread (a.k.a. phase difference between left and right LFO).
+
+   Note that you can actually make this unit sound pretty much like a chorus
+   by cranking up the delay time while setting the feedback to zero and
+   reducing level and depth (the latter by at least an order of magnitude). */
+
+declare name "flanger -- stereo flanger with feedback";
+declare author "Albert Graef";
+declare version "1.0";
+
+import("music.lib");
+
+level			= hslider("level", 1, 0, 1, 0.01);
+freq			= hslider("freq", 2, 0, 10, 0.01);
+dtime			= hslider("delay", 0.002, 0, 0.04, 0.001);
+depth			= hslider("depth", 0.5, 0, 1, 0.001);
+feedback		= hslider("feedback", 0.1, 0, 1, 0.001);
+stereo			= hslider("stereo", 1, 0, 1, 0.001);
+
+tblosc(n,f,freq,mod)	= (1-d)*rdtable(n,waveform,i&(n-1)) +
+			  d*rdtable(n,waveform,(i+1)&(n-1))
+with {
+	waveform	= time*(2.0*PI)/n : f;
+	phase		= freq/SR : (+ : decimal) ~ _;
+	modphase	= decimal(phase+mod/(2*PI))*n;
+	i		= int(floor(modphase));
+	d		= decimal(modphase);
+};
+
+triangle(t)		= ((0<=t) & (t<=PI))*((2*t-PI)/PI) +
+			  ((PI<t) & (t<=2*PI))*((3*PI-2*t)/PI);
+
+flanger(dtime,freq,level,feedback,depth,phase,x)
+			= (x+(loop(x)*level))/(1+level)
+with {
+	t	= SR*dtime/2*(1+depth*tblosc(1<<16, triangle, freq, phase));
+	loop	= (+ : fdelay(1<<16, t)) ~ *(feedback);
+};
+
+process			= vgroup("flanger", (left, right))
+with {
+	left	= flanger(dtime,freq,level,feedback,depth,0);
+	right	= flanger(dtime,freq,level,feedback,depth,stereo*PI);
+};