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

diff --git a/interpreter/preprocessor/faust-0.9.47mr3/examples/lowcut.dsp b/interpreter/preprocessor/faust-0.9.47mr3/examples/lowcut.dsp
new file mode 100644
index 0000000..c758611
--- /dev/null
+++ b/interpreter/preprocessor/faust-0.9.47mr3/examples/lowcut.dsp
@@ -0,0 +1,42 @@
+declare name 		"lowcut";
+declare version 	"1.0";
+declare author 		"Grame";
+declare license 	"BSD";
+declare copyright 	"(c)GRAME 2006";
+
+//------------------------------------------------------------------
+//	DAFX, Digital Audio Effects (Wiley ed.)
+//	chapter 2 	: filters
+//	section 2.3 : Equalizers
+//	page 53 	: second order shelving filter design
+//------------------------------------------------------------------
+
+import("music.lib");
+
+
+
+//------------------- low-frequency shelving cut (table 2.3) --------------------
+
+V0(g)			= pow(10,g/-20.0);
+K(fc) 			= tan(PI*fc/SR);
+square(x)		= x*x;
+denom(fc,g)		= 1 + sqrt(2*V0(g))*K(fc) + V0(g)*square(K(fc));
+
+lfcut(fc, g)	= TF2(  (1 + sqrt(2)*K(fc) + square(K(fc))) / denom(fc,g),
+						 2 * (square(K(fc)) - 1) / denom(fc,g),
+						(1 - sqrt(2)*K(fc) + square(K(fc))) / denom(fc,g),
+						 2 * (V0(g)*square(K(fc)) - 1) / denom(fc,g),
+						(1 - sqrt(2*V0(g))*K(fc) + V0(g)*square(K(fc))) / denom(fc,g)
+					 );
+
+
+//------------------------------ User Interface -----------------------------------
+
+freq 			= hslider("freq [unit:Hz][style:knob]", 100, 20, 5000, 1);
+att				= hslider("attenuation [unit:dB][style:knob]", 0, -96, 10, 0.1);
+
+
+//----------------------------------- Process -------------------------------------
+
+process 		= vgroup("low-freq shelving cut", lfcut(freq,att));
+