Integrated program of 4 different kinds of application programs for processing sound signal. 4種類のサウンド信号処理を統合したプログラム.
Dependencies: F746_GUI F746_SAI_IO FrequencyResponseDrawer SD_PlayerSkeleton UIT_FFT_Real
MyGraphicEqualizer/BiquadGrEq.hpp@15:fac50dd1de44, 2017-04-13 (annotated)
- Committer:
- MikamiUitOpen
- Date:
- Thu Apr 13 23:23:30 2017 +0000
- Revision:
- 15:fac50dd1de44
15
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
MikamiUitOpen | 15:fac50dd1de44 | 1 | //-------------------------------------------------------------- |
MikamiUitOpen | 15:fac50dd1de44 | 2 | // グラフィックイコライザで使う 1D タイプの 2 次のフィルタ |
MikamiUitOpen | 15:fac50dd1de44 | 3 | // Biquad filter of 1D type for graphic equalizer |
MikamiUitOpen | 15:fac50dd1de44 | 4 | // このクラスでは,係数は実行中に書き換えられることを想定している |
MikamiUitOpen | 15:fac50dd1de44 | 5 | // |
MikamiUitOpen | 15:fac50dd1de44 | 6 | // u[n] = x[n] + a1*u[n-1] + a2*u[n-2] |
MikamiUitOpen | 15:fac50dd1de44 | 7 | // y[n] = b0*u[n] + b1*u[n-1] + b2*u[n-2] |
MikamiUitOpen | 15:fac50dd1de44 | 8 | // x[n] : input signal |
MikamiUitOpen | 15:fac50dd1de44 | 9 | // y[n] : output signal |
MikamiUitOpen | 15:fac50dd1de44 | 10 | // |
MikamiUitOpen | 15:fac50dd1de44 | 11 | // 2017/03/28, Copyright (c) 2017 MIKAMI, Naoki |
MikamiUitOpen | 15:fac50dd1de44 | 12 | //-------------------------------------------------------------- |
MikamiUitOpen | 15:fac50dd1de44 | 13 | |
MikamiUitOpen | 15:fac50dd1de44 | 14 | #ifndef IIR_BIQUAD_GREQ_HPP |
MikamiUitOpen | 15:fac50dd1de44 | 15 | #define IIR_BIQUAD_GREQ_HPP |
MikamiUitOpen | 15:fac50dd1de44 | 16 | |
MikamiUitOpen | 15:fac50dd1de44 | 17 | #include "mbed.h" |
MikamiUitOpen | 15:fac50dd1de44 | 18 | |
MikamiUitOpen | 15:fac50dd1de44 | 19 | // 2nd order IIR filter |
MikamiUitOpen | 15:fac50dd1de44 | 20 | namespace Mikami |
MikamiUitOpen | 15:fac50dd1de44 | 21 | { |
MikamiUitOpen | 15:fac50dd1de44 | 22 | class BiquadGrEq |
MikamiUitOpen | 15:fac50dd1de44 | 23 | { |
MikamiUitOpen | 15:fac50dd1de44 | 24 | public: |
MikamiUitOpen | 15:fac50dd1de44 | 25 | struct Coefs { float a1, a2, b0, b1, b2; }; |
MikamiUitOpen | 15:fac50dd1de44 | 26 | |
MikamiUitOpen | 15:fac50dd1de44 | 27 | BiquadGrEq(const Coefs ck = (Coefs){0, 0, 0, 0, 0}) |
MikamiUitOpen | 15:fac50dd1de44 | 28 | { |
MikamiUitOpen | 15:fac50dd1de44 | 29 | SetCoefficients(ck); |
MikamiUitOpen | 15:fac50dd1de44 | 30 | Clear(); |
MikamiUitOpen | 15:fac50dd1de44 | 31 | } |
MikamiUitOpen | 15:fac50dd1de44 | 32 | |
MikamiUitOpen | 15:fac50dd1de44 | 33 | void SetCoefficients(const Coefs cf) { cf_ = cf; } |
MikamiUitOpen | 15:fac50dd1de44 | 34 | |
MikamiUitOpen | 15:fac50dd1de44 | 35 | float Execute(float xn) |
MikamiUitOpen | 15:fac50dd1de44 | 36 | { |
MikamiUitOpen | 15:fac50dd1de44 | 37 | float un = xn + cf_.a1*un1_ + cf_.a2*un2_; |
MikamiUitOpen | 15:fac50dd1de44 | 38 | float yn = cf_.b0*un + cf_.b1*un1_ + cf_.b2*un2_; |
MikamiUitOpen | 15:fac50dd1de44 | 39 | |
MikamiUitOpen | 15:fac50dd1de44 | 40 | un2_ = un1_; |
MikamiUitOpen | 15:fac50dd1de44 | 41 | un1_ = un; |
MikamiUitOpen | 15:fac50dd1de44 | 42 | |
MikamiUitOpen | 15:fac50dd1de44 | 43 | return yn; |
MikamiUitOpen | 15:fac50dd1de44 | 44 | } |
MikamiUitOpen | 15:fac50dd1de44 | 45 | |
MikamiUitOpen | 15:fac50dd1de44 | 46 | void Clear() { un1_ = un2_ = 0; } |
MikamiUitOpen | 15:fac50dd1de44 | 47 | |
MikamiUitOpen | 15:fac50dd1de44 | 48 | private: |
MikamiUitOpen | 15:fac50dd1de44 | 49 | Coefs cf_; |
MikamiUitOpen | 15:fac50dd1de44 | 50 | float un1_, un2_; |
MikamiUitOpen | 15:fac50dd1de44 | 51 | |
MikamiUitOpen | 15:fac50dd1de44 | 52 | // disallow copy constructor |
MikamiUitOpen | 15:fac50dd1de44 | 53 | BiquadGrEq(const BiquadGrEq&); |
MikamiUitOpen | 15:fac50dd1de44 | 54 | }; |
MikamiUitOpen | 15:fac50dd1de44 | 55 | } |
MikamiUitOpen | 15:fac50dd1de44 | 56 | #endif // IIR_BIQUAD_GREQ_HPP |