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

diff --git a/interpretor/preprocessor/faust-0.9.47mr3/tools/faust2pd/examples/faust/lowboost.dsp b/interpretor/preprocessor/faust-0.9.47mr3/tools/faust2pd/examples/faust/lowboost.dsp
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+++ b/interpretor/preprocessor/faust-0.9.47mr3/tools/faust2pd/examples/faust/lowboost.dsp
@@ -0,0 +1,41 @@
+declare name 		"lowboost";
+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 boost (table 2.3) --------------------
+
+V0(g)			= pow(10,g/20.0);
+K(fc) 			= tan(PI*fc/SR);
+square(x)		= x*x;
+denom(fc)		= 1 + sqrt(2)*K(fc) + square(K(fc));
+
+lfboost(fc, g)	= TF2(  (1 + sqrt(2*V0(g))*K(fc) + V0(g)*square(K(fc))) / denom(fc),
+						 2 * (V0(g)*square(K(fc)) - 1) / denom(fc),
+						(1 - sqrt(2*V0(g))*K(fc) + V0(g)*square(K(fc))) / denom(fc),
+						 2 * (square(K(fc)) - 1) / denom(fc),
+						(1 - sqrt(2)*K(fc) + square(K(fc))) / denom(fc)
+					 );
+
+
+//------------------------------ User Interface -----------------------------------
+
+freq 				= hslider("freq", 1000, 20, 20000, 0.1);
+gain				= hslider("gain (db)", 0, -20, 20, 0.1);
+
+
+//----------------------------------- Process -------------------------------------
+
+process 			= vgroup("low-freq shelving boost", lfboost(freq,gain));
+