不韋 呂 / F746_MySoundMachine

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

MyVariableFilter/IIR_CascadeFrqResp.hpp@16:d60e5187fd31, 2017-04-27 (annotated)

Committer:
MikamiUitOpen
Date:
Thu Apr 27 23:55:53 2017 +0000
Revision:
16:d60e5187fd31
Parent:
15:fac50dd1de44 
17

Who changed what in which revision?

UserRevisionLine numberNew contents of line
MikamiUitOpen 15:fac50dd1de44 1 //-----------------------------------------------------------
MikamiUitOpen 15:fac50dd1de44 2 // Frequency response for IIR filter of cascade form
MikamiUitOpen 15:fac50dd1de44 3 //
MikamiUitOpen 15:fac50dd1de44 4 // 2017/03/28, Copyright (c) 2017 MIKAMI, Naoki
MikamiUitOpen 15:fac50dd1de44 5 //-----------------------------------------------------------
MikamiUitOpen 15:fac50dd1de44 6
MikamiUitOpen 15:fac50dd1de44 7 #ifndef IIR_CASCADE_FREQUENCY_RESPONSE_HPP
MikamiUitOpen 15:fac50dd1de44 8 #define IIR_CASCADE_FREQUENCY_RESPONSE_HPP
MikamiUitOpen 15:fac50dd1de44 9
MikamiUitOpen 15:fac50dd1de44 10 #include "FrequancyResponseBase.hpp"
MikamiUitOpen 15:fac50dd1de44 11 #include "Biquad.hpp"
MikamiUitOpen 15:fac50dd1de44 12
MikamiUitOpen 15:fac50dd1de44 13 namespace Mikami
MikamiUitOpen 15:fac50dd1de44 14 {
MikamiUitOpen 15:fac50dd1de44 15 class IIR_CascadeFrqResp : public FrequencyResponse
MikamiUitOpen 15:fac50dd1de44 16 {
MikamiUitOpen 15:fac50dd1de44 17 public:
MikamiUitOpen 15:fac50dd1de44 18 IIR_CascadeFrqResp() {}
MikamiUitOpen 15:fac50dd1de44 19
MikamiUitOpen 15:fac50dd1de44 20 // 次数とフィルタの係数設定
MikamiUitOpen 15:fac50dd1de44 21 void SetParams(int order, float g0, Biquad::Coefs ck[])
MikamiUitOpen 15:fac50dd1de44 22 {
MikamiUitOpen 15:fac50dd1de44 23 order_ = order;
MikamiUitOpen 15:fac50dd1de44 24 g0_ = g0;
MikamiUitOpen 15:fac50dd1de44 25 ck_ = ck;
MikamiUitOpen 15:fac50dd1de44 26 }
MikamiUitOpen 15:fac50dd1de44 27
MikamiUitOpen 15:fac50dd1de44 28 // 周波数応答の絶対値を返す関数, 引数: z^(-1)
MikamiUitOpen 15:fac50dd1de44 29 virtual float AbsH_z(Complex u)
MikamiUitOpen 15:fac50dd1de44 30 {
MikamiUitOpen 15:fac50dd1de44 31 Complex h = g0_;
MikamiUitOpen 15:fac50dd1de44 32 for (int k=0; k<order_/2; k++)
MikamiUitOpen 15:fac50dd1de44 33 h = h*(1.0f + (ck_[k].b1 + ck_[k].b2*u)*u)
MikamiUitOpen 15:fac50dd1de44 34 /(1.0f - (ck_[k].a1 + ck_[k].a2*u)*u);
MikamiUitOpen 15:fac50dd1de44 35 return abs(h);
MikamiUitOpen 15:fac50dd1de44 36 }
MikamiUitOpen 15:fac50dd1de44 37
MikamiUitOpen 15:fac50dd1de44 38 private:
MikamiUitOpen 15:fac50dd1de44 39 int order_;
MikamiUitOpen 15:fac50dd1de44 40 float g0_;
MikamiUitOpen 15:fac50dd1de44 41 Biquad::Coefs *ck_;
MikamiUitOpen 15:fac50dd1de44 42
MikamiUitOpen 15:fac50dd1de44 43 // disallow copy constructor and assignment operator
MikamiUitOpen 15:fac50dd1de44 44 IIR_CascadeFrqResp(const IIR_CascadeFrqResp&);
MikamiUitOpen 15:fac50dd1de44 45 IIR_CascadeFrqResp& operator=(const IIR_CascadeFrqResp&);
MikamiUitOpen 15:fac50dd1de44 46 };
MikamiUitOpen 15:fac50dd1de44 47 }
MikamiUitOpen 15:fac50dd1de44 48 #endif // IIR_CASCADE_FREQUENCY_RESPONSE_HPP