revised version of F746_SD_GraphicEqualizer
Dependencies: BSP_DISCO_F746NG F746_GUI F746_SAI_IO FrequencyResponseDrawer LCD_DISCO_F746NG SDFileSystem_Warning_Fixed TS_DISCO_F746NG mbed
Fork of F746_SD_GraphicEqualizer by
MyClasses_Functions/GrEqualizerFrqResp.hpp
- Committer:
- edamame22
- Date:
- 2016-07-07
- Revision:
- 12:87f6955b5a80
- Parent:
- 0:e953eb392151
File content as of revision 12:87f6955b5a80:
//----------------------------------------------------------- // グラフィックイコライザで使う IIR フィルタの周波数応答 // Frequency response for graphic equalizer // // 2016/04/27, Copyright (c) 2016 MIKAMI, Naoki //----------------------------------------------------------- #ifndef GRAPHIC_EQUALIZER_FREQUENCY_RESPONSE_HPP #define GRAPHIC_EQUALIZER_FREQUENCY_RESPONSE_HPP #include "FrequancyResponseBase.hpp" #include "BiquadGrEq.hpp" namespace Mikami { class GrEqualizerFrqResp : public FrequencyResponse { public: GrEqualizerFrqResp(int stages) : STAGES_(stages) { ck_ = new BiquadGrEq::Coefs[stages]; } ~GrEqualizerFrqResp() { delete[] ck_; } // フィルタの係数設定 void SetParams(BiquadGrEq::Coefs ck[]) { for (int n=0; n<STAGES_; n++) ck_[n] = ck[n]; } void SetParam(BiquadGrEq::Coefs ck, int n) { ck_[n] = ck; } // 周波数応答の絶対値を返す関数, 引数: z^(-1) virtual float AbsH_z(Complex u) { Complex h = 1; for (int k=0; k<STAGES_; k++) h = h*(ck_[k].b0 + (ck_[k].b1 + ck_[k].b2*u)*u) /((1.0f - (ck_[k].a1 + ck_[k].a2*u)*u)); return abs(h); } private: const int STAGES_; float g0_; BiquadGrEq::Coefs *ck_; // disallow copy constructor and assignment operator GrEqualizerFrqResp(const GrEqualizerFrqResp&); GrEqualizerFrqResp& operator=(const GrEqualizerFrqResp&); }; } #endif // GRAPHIC_EQUALIZER_FREQUENCY_RESPONSE_HPP