不韋 呂 / Mbed 2 deprecated F746_AudioPlayerSD

Output the audio signal (*.bin) with filtering by IIR filter in the SD card using onboard CODEC. For *.wav file, F746_SD_WavPlayer and F746_SD_GraphicEqualiser are published on mbed. SD カードのオーディオ信号 (*.bin) を遮断周波数可変の IIR フィルタを通して，ボードに搭載されているCODEC で出力する．*.wav 形式のファイル用には，F746_SD_WavPlayer と F746_SD_GraphicEqualiser を mbed で公開している．

Dependencies:   BSP_DISCO_F746NG_patch_fixed F746_GUI LCD_DISCO_F746NG SDFileSystem_Warning_Fixed TS_DISCO_F746NG mbed

MyClasses_Functions/IIR_CascadeFrqResp.hpp@3:492cb0f68526, 2016-04-16 (annotated)

Committer:
MikamiUitOpen
Date:
Sat Apr 16 13:53:26 2016 +0000
Revision:
3:492cb0f68526
4

Who changed what in which revision?

UserRevisionLine numberNew contents of line
MikamiUitOpen 3:492cb0f68526 1 //-----------------------------------------------------------
MikamiUitOpen 3:492cb0f68526 2 // Frequency response for IIR filter of cascade form
MikamiUitOpen 3:492cb0f68526 3 //
MikamiUitOpen 3:492cb0f68526 4 // 2016/04/16, Copyright (c) 2016 MIKAMI, Naoki
MikamiUitOpen 3:492cb0f68526 5 //-----------------------------------------------------------
MikamiUitOpen 3:492cb0f68526 6
MikamiUitOpen 3:492cb0f68526 7 #ifndef IIR_CASCADE_FREQUENCY_RESPONSE_HPP
MikamiUitOpen 3:492cb0f68526 8 #define IIR_CASCADE_FREQUENCY_RESPONSE_HPP
MikamiUitOpen 3:492cb0f68526 9
MikamiUitOpen 3:492cb0f68526 10 #include "FrequancyResponseBase.hpp"
MikamiUitOpen 3:492cb0f68526 11 #include "Biquad.hpp"
MikamiUitOpen 3:492cb0f68526 12
MikamiUitOpen 3:492cb0f68526 13 namespace Mikami
MikamiUitOpen 3:492cb0f68526 14 {
MikamiUitOpen 3:492cb0f68526 15 class IIR_CascadeFrqResp : public FrequencyResponse
MikamiUitOpen 3:492cb0f68526 16 {
MikamiUitOpen 3:492cb0f68526 17 public:
MikamiUitOpen 3:492cb0f68526 18 IIR_CascadeFrqResp() {}
MikamiUitOpen 3:492cb0f68526 19
MikamiUitOpen 3:492cb0f68526 20 // 次数とフィルタの係数設定
MikamiUitOpen 3:492cb0f68526 21 void SetParams(int order, float g0, Biquad::Coefs ck[])
MikamiUitOpen 3:492cb0f68526 22 {
MikamiUitOpen 3:492cb0f68526 23 order_ = order;
MikamiUitOpen 3:492cb0f68526 24 g0_ = g0;
MikamiUitOpen 3:492cb0f68526 25 ck_ = ck;
MikamiUitOpen 3:492cb0f68526 26 }
MikamiUitOpen 3:492cb0f68526 27
MikamiUitOpen 3:492cb0f68526 28 // 周波数応答の絶対値を返す関数, 引数: z^(-1)
MikamiUitOpen 3:492cb0f68526 29 virtual float AbsH_z(Complex u)
MikamiUitOpen 3:492cb0f68526 30 {
MikamiUitOpen 3:492cb0f68526 31 Complex h = g0_;
MikamiUitOpen 3:492cb0f68526 32 for (int k=0; k<order_/2; k++)
MikamiUitOpen 3:492cb0f68526 33 h = h*(1.0f + (ck_[k].b1 + ck_[k].b2*u)*u)
MikamiUitOpen 3:492cb0f68526 34 /((1.0f - (ck_[k].a1 + ck_[k].a2*u)*u));
MikamiUitOpen 3:492cb0f68526 35 return abs(h);
MikamiUitOpen 3:492cb0f68526 36 }
MikamiUitOpen 3:492cb0f68526 37
MikamiUitOpen 3:492cb0f68526 38 private:
MikamiUitOpen 3:492cb0f68526 39 int order_;
MikamiUitOpen 3:492cb0f68526 40 float g0_;
MikamiUitOpen 3:492cb0f68526 41 Biquad::Coefs *ck_;
MikamiUitOpen 3:492cb0f68526 42
MikamiUitOpen 3:492cb0f68526 43 // disallow copy constructor and assignment operator
MikamiUitOpen 3:492cb0f68526 44 IIR_CascadeFrqResp(const IIR_CascadeFrqResp&);
MikamiUitOpen 3:492cb0f68526 45 IIR_CascadeFrqResp& operator=(const IIR_CascadeFrqResp&);
MikamiUitOpen 3:492cb0f68526 46 };
MikamiUitOpen 3:492cb0f68526 47 }
MikamiUitOpen 3:492cb0f68526 48 #endif // IIR_CASCADE_FREQUENCY_RESPONSE_HPP