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

diff --git a/interpretor/preprocessor/faust-0.9.47mr3/examples/lfboost.dsp b/interpretor/preprocessor/faust-0.9.47mr3/examples/lfboost.dsp
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+declare name 		"lfboost";
+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("math.lib");
+import("music.lib");
+
+
+//----------------------low frequency boost filter -------------------------------
+// lfboost(F,G)
+//				F :	frequency (in Hz)
+//				G : gain (in dB)
+//
+//--------------------------------------------------------------------------------
+
+lfboost(F,G)	= TF2(  (1 + sqrt(2*V)*K + V*K*K) / denom,
+						 2 * (V*K*K - 1) / denom,
+						(1 - sqrt(2*V)*K + V*K*K) / denom,
+						 2 * (K*K - 1) / denom,
+						(1 - sqrt(2)*K + K*K) / denom
+					 )
+		with {
+			V			= db2linear(G);
+			K 			= tan(PI*F/SR);
+			denom		= 1 + sqrt(2)*K + K*K;
+		};
+
+
+
+//====================low frequency boost process ===============================
+
+process = vgroup("lowboost", lfboost(
+								nentry("freq [unit:Hz][style:knob]", 100, 20, 150, 1),
+								vslider("gain [unit:dB]", 0, -20, 20, 0.1)
+				) );