1 /**
2 * BiQuad filter
3 *
4 * Copyright (C) 2006-2018 Teru Kamogashira
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
19 */
20
_FV3_(biquad)21 class _FV3_(biquad)
22 {
23 public:
24 _FV3_(biquad)();
25 void printconfig();
26 void mute();
27 _fv3_float_t get_A1(){return a1;}
28 _fv3_float_t get_A2(){return a2;}
29 _fv3_float_t get_B0(){return b0;}
30 _fv3_float_t get_B1(){return b1;}
31 _fv3_float_t get_B2(){return b2;}
32 void set_A1(_fv3_float_t v){a1=v;}
33 void set_A2(_fv3_float_t v){a2=v;}
34 void set_B0(_fv3_float_t v){b0=v;}
35 void set_B1(_fv3_float_t v){b1=v;}
36 void set_B2(_fv3_float_t v){b2=v;}
37
38 void setCoefficients(_fv3_float_t _b0, _fv3_float_t _b1, _fv3_float_t _b2, _fv3_float_t _a1, _fv3_float_t _a2);
39
40 void setAPF_RBJ(_fv3_float_t fc, _fv3_float_t bw, _fv3_float_t fs, unsigned mode);
41 void setLPF_RBJ(_fv3_float_t fc, _fv3_float_t bw, _fv3_float_t fs, unsigned mode);
42 void setHPF_RBJ(_fv3_float_t fc, _fv3_float_t bw, _fv3_float_t fs, unsigned mode);
43 void setBSF_RBJ(_fv3_float_t fc, _fv3_float_t bw, _fv3_float_t fs, unsigned mode);
44 void setBPF_RBJ(_fv3_float_t fc, _fv3_float_t bw, _fv3_float_t fs, unsigned mode);
45 void setBPFP_RBJ(_fv3_float_t fc, _fv3_float_t bw, _fv3_float_t fs, unsigned mode);
46 void setPeakEQ_RBJ(_fv3_float_t fc, _fv3_float_t gain, _fv3_float_t bw, _fv3_float_t fs);
47 void setLSF_RBJ(_fv3_float_t fc, _fv3_float_t gain, _fv3_float_t slope, _fv3_float_t fs);
48 void setHSF_RBJ(_fv3_float_t fc, _fv3_float_t gain, _fv3_float_t slope, _fv3_float_t fs);
49
50 inline _fv3_float_t process(_fv3_float_t input)
51 {
52 return this->processd1(input);
53 }
54 inline _fv3_float_t operator()(_fv3_float_t input){return this->process(input);}
55
56 // Direct form I
57 inline _fv3_float_t processd1(_fv3_float_t input)
58 {
59 _fv3_float_t i0 = input;
60 input *= b0;
61 input += b1 * i1 + b2 * i2;
62 input -= a1 * o1 + a2 * o2 ;
63 UNDENORMAL(input);
64 i2 = i1; i1 = i0;
65 o2 = o1; o1 = input;
66 return input;
67 }
68
69 // Direct form II
70 inline _fv3_float_t processd2(_fv3_float_t input)
71 {
72 input -= a1 * t1 + a2 * t2 ;
73 t0 = input; input *= b0;
74 input += b1 * t1 + b2 * t2;
75 UNDENORMAL(input);
76 t2 = t1; t1 = t0;
77 return input;
78 }
79
80 private:
81 _FV3_(biquad)(const _FV3_(biquad)& x);
82 _FV3_(biquad)& operator=(const _FV3_(biquad)& x);
83 _fv3_float_t calcAlpha(_fv3_float_t fc, _fv3_float_t bw, _fv3_float_t fs, unsigned mode);
84
85 _fv3_float_t a1, a2, b0, b1, b2;
86 _fv3_float_t i1, i2, o1, o2, t0, t1, t2;
87 };
88
_FV3_(iir_lr4)89 class _FV3_(iir_lr4)
90 {
91 public:
92 void setLPF(_fv3_float_t fc, _fv3_float_t fs)
93 { iir1.setLPF_RBJ(fc,FV3_BIQUAD_RBJ_Q_BUTTERWORTH,fs,FV3_BIQUAD_RBJ_Q);
94 iir2.setLPF_RBJ(fc,FV3_BIQUAD_RBJ_Q_BUTTERWORTH,fs,FV3_BIQUAD_RBJ_Q); }
95 void setHPF(_fv3_float_t fc, _fv3_float_t fs)
96 { iir1.setHPF_RBJ(fc,FV3_BIQUAD_RBJ_Q_BUTTERWORTH,fs,FV3_BIQUAD_RBJ_Q);
97 iir2.setHPF_RBJ(fc,FV3_BIQUAD_RBJ_Q_BUTTERWORTH,fs,FV3_BIQUAD_RBJ_Q); }
98
99 inline _fv3_float_t process(_fv3_float_t input){ return this->processd1(input); }
100 inline _fv3_float_t operator()(_fv3_float_t input){ return this->process(input); }
101 inline _fv3_float_t processd1(_fv3_float_t input){ return iir2(iir1(input)); }
102 inline _fv3_float_t processd2(_fv3_float_t input){ return iir2.processd2(iir1.processd2(input)); }
103
104 private:
105 _FV3_(iir_lr4)(const _FV3_(iir_lr4)& x );
106 _FV3_(iir_lr4)& operator=(const _FV3_(iir_lr4)& x);
107 _FV3_(biquad) iir1, iir2;
108 };
109