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00001 /*************************************************************************** 00002 enginefilteriir.h - description 00003 ------------------- 00004 copyright : (C) 2002 by Tue and Ken Haste Andersen 00005 email : 00006 ***************************************************************************/ 00007 00008 /*************************************************************************** 00009 * * 00010 * This program is free software; you can redistribute it and/or modify * 00011 * it under the terms of the GNU General Public License as published by * 00012 * the Free Software Foundation; either version 2 of the License, or * 00013 * (at your option) any later version. * 00014 * * 00015 ***************************************************************************/ 00016 00017 #ifndef ENGINEFILTERIIR_H 00018 #define ENGINEFILTERIIR_H 00019 00020 #include "engine/engineobject.h" 00021 #include "defs.h" 00022 00023 class EngineFilterIIR : public EngineObject 00024 { 00025 public: 00026 EngineFilterIIR(const double *pCoefs, int iOrder); 00027 ~EngineFilterIIR(); 00028 void process(const CSAMPLE *pIn, const CSAMPLE *pOut, const int iBufferSize); 00029 protected: 00030 int order; 00031 const double *coefs; 00032 #define MAXNZEROS 8 00033 #define MAXNPOLES 8 00034 double xv1[MAXNZEROS+1], yv1[MAXNPOLES+1]; 00035 double xv2[MAXNZEROS+1], yv2[MAXNPOLES+1]; 00036 }; 00037 00038 // 00039 // Defines filter coefficients for IIR filters: 00040 // 00041 00042 // 8th order lowpass, corner at 600 Hz 00043 static const double bessel_lowpass[13] = { 7.444032197e+08, 00044 8, 28, 56, 70, 00045 -0.3800297563, 3.4120798629, 00046 -13.4230504610, 30.2214248640, 00047 -42.5938048390, 38.4826057150, 00048 -21.7665031930, 7.0472774638}; 00049 00050 // 4th order highpass, corner at 4000 Hz: 00051 static const double bessel_highpass[13] = {2.465837728e+00, // gain 00052 - 8,+ 28, - 56, + 70, 00053 -0.1552424571, 1.5489970216, 00054 -6.7821376632,17.0223182510, 00055 -26.7923322400,27.0856195480, 00056 -17.1796384890, 6.2523870250}; 00057 00058 // 8th order bandpass at 600 - 4000Hz: 00059 static const double bessel_bandpass[13] = {1.455078491e+02, 00060 0,-4,0,6, 00061 -0.1002852333, 1.0213655417, 00062 -4.6272090652, 12.1726925480, 00063 -20.3120761830, 21.9557125490, 00064 -14.9560287020, 5.8458265249}; 00065 00066 00067 // 2nd order lowpass, corner 600Hz 00068 static const double bessel_lowpass2[4] = {3.707141512e+02, 2, -0.8282366449, 1.8174466602}; 00069 00070 // 2nd order bandpass at 600 - 4000Hz: 00071 static const double bessel_bandpass2[7] = {1.596830813e+01, 0, -2, -0.3374389990, 1.7280392126, -3.4124608099, 3.0203698354}; 00072 00073 // 2nd order highpass, corner at 4000 Hz: 00074 static const double bessel_highpass2[4] = {1.451889828e+00, -2, -0.4505643044, 1.3044656722}; 00075 00076 // 4th order lowpass, corner 600Hz 00077 static const double bessel_lowpass4[7] = {6.943736360e+04, 4, 6, -0.6673458737, 2.9444565421, -4.8814113588, 3.6040702669}; 00078 00079 // 4th order highpass, corner 4000Hz 00080 static const double bessel_highpass4[7] = {1.807553687e+00, -4, 6, -0.2898387148, 1.5497144728, -3.1422295239, 2.8699599032}; 00081 00082 00083 /* Mixer Based EQ curves by John */ 00084 00085 /* Pioneer DJM-800 */ 00086 // 4th order highpass, 13000Hz 00087 static const double bessel_highpass4_DJM800[7] = { 7.008002645e+00, -4,6, -0.0055179324, 0.0231872663, -0.2820220774, 0.3036711584}; 00088 00089 //8th order bandpass, 70Hz - 1300Hz 00090 static const double bessel_bandpass8_DJM800[13] = {6.433626341e+00, 0,-4, 0, 6, -0.0268312520, -0.0457103934, -0.1683239580, 1.0127019818, -1.4501742764, 2.2058243400, -3.8082264201, 3.2807399531}; 00091 00092 // 4th order lowpass, 70Hz 00093 static const double bessel_lowpass4_DJM800[7] = {1.638353272e+09, 4, 6, -0.9742750319, 3.9224911601, -5.9221546753, 3.9739385374}; 00094 00095 00096 /* Mackie D2 */ 00097 // 4th order highpass, 4000Hz 00098 static const double bessel_highpass4D2[7] = {1.807553687e+00, -4, 6, -0.2898387148, 1.5497144728, -3.1422295239, 2.8699599032}; 00099 00100 00101 00102 #endif
1.7.3 
