不韋 呂 / Mbed 2 deprecated F746_SD_WavPlayer

Output the audio signal with filtering by IIR filter in the *.wav file on the SD card using onboard CODEC. SD カードの *.wav ファイルのオーディオ信号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．

Dependencies:   BSP_DISCO_F746NG F746_GUI LCD_DISCO_F746NG SDFileSystem_Warning_Fixed TS_DISCO_F746NG mbed FrequencyResponseDrawer F746_SAI_IO Array_Matrix

MyClasses_Functions/BilinearDesignLH.hpp@11:769d986c10fa, 2016-07-04 (annotated)

Committer:
MikamiUitOpen
Date:
Mon Jul 04 05:59:44 2016 +0000
Revision:
11:769d986c10fa
Parent:
0:04b43b777fae 
12

Who changed what in which revision?

UserRevisionLine numberNew contents of line
MikamiUitOpen 0:04b43b777fae 1 //------------------------------------------------------------------------------
MikamiUitOpen 0:04b43b777fae 2 // Design of Butterworth LPF and HPF using bilinear transform -- Header
MikamiUitOpen 0:04b43b777fae 3 //
MikamiUitOpen 0:04b43b777fae 4 // 2016/03/31, Copyright (c) 2016 MIKAMI, Naoki
MikamiUitOpen 0:04b43b777fae 5 //------------------------------------------------------------------------------
MikamiUitOpen 0:04b43b777fae 6
MikamiUitOpen 0:04b43b777fae 7 #ifndef BILINEAR_BUTTERWORTH_HPP
MikamiUitOpen 0:04b43b777fae 8 #define BILINEAR_BUTTERWORTH_HPP
MikamiUitOpen 0:04b43b777fae 9
MikamiUitOpen 0:04b43b777fae 10 #include "mbed.h"
MikamiUitOpen 0:04b43b777fae 11 #include <complex> // requisite
MikamiUitOpen 0:04b43b777fae 12
MikamiUitOpen 0:04b43b777fae 13 namespace Mikami
MikamiUitOpen 0:04b43b777fae 14 {
MikamiUitOpen 0:04b43b777fae 15 typedef complex<float> Complex; // define "Complex"
MikamiUitOpen 0:04b43b777fae 16
MikamiUitOpen 0:04b43b777fae 17 class BilinearDesign
MikamiUitOpen 0:04b43b777fae 18 {
MikamiUitOpen 0:04b43b777fae 19 public:
MikamiUitOpen 0:04b43b777fae 20 struct Coefs { float a1, a2, b1, b2; };
MikamiUitOpen 0:04b43b777fae 21 enum Type { LPF, HPF };
MikamiUitOpen 0:04b43b777fae 22
MikamiUitOpen 0:04b43b777fae 23 // Constructor
MikamiUitOpen 0:04b43b777fae 24 BilinearDesign(int order, float fs)
MikamiUitOpen 0:04b43b777fae 25 : PI_FS_(PI_/fs), ORDER_(order)
MikamiUitOpen 0:04b43b777fae 26 {
MikamiUitOpen 0:04b43b777fae 27 sP_ = new Complex[order/2];
MikamiUitOpen 0:04b43b777fae 28 zP_ = new Complex[order/2];
MikamiUitOpen 0:04b43b777fae 29 ck_ = new Coefs[order/2];
MikamiUitOpen 0:04b43b777fae 30 }
MikamiUitOpen 0:04b43b777fae 31
MikamiUitOpen 0:04b43b777fae 32 // Destractor
MikamiUitOpen 0:04b43b777fae 33 ~BilinearDesign()
MikamiUitOpen 0:04b43b777fae 34 {
MikamiUitOpen 0:04b43b777fae 35 delete[] sP_;
MikamiUitOpen 0:04b43b777fae 36 delete[] zP_;
MikamiUitOpen 0:04b43b777fae 37 delete[] ck_;
MikamiUitOpen 0:04b43b777fae 38 }
MikamiUitOpen 0:04b43b777fae 39
MikamiUitOpen 0:04b43b777fae 40 // Execution of design
MikamiUitOpen 0:04b43b777fae 41 void Execute(float fc, Type pb, Coefs c[], float& g);
MikamiUitOpen 0:04b43b777fae 42
MikamiUitOpen 0:04b43b777fae 43 private:
MikamiUitOpen 0:04b43b777fae 44 static const float PI_ = 3.1415926536f;
MikamiUitOpen 0:04b43b777fae 45 const float PI_FS_;
MikamiUitOpen 0:04b43b777fae 46 const int ORDER_;
MikamiUitOpen 0:04b43b777fae 47
MikamiUitOpen 0:04b43b777fae 48 Complex* sP_; // Poles on s-plane
MikamiUitOpen 0:04b43b777fae 49 Complex* zP_; // Poles on z-plane
MikamiUitOpen 0:04b43b777fae 50 Coefs* ck_; // Coefficients of transfer function for cascade form
MikamiUitOpen 0:04b43b777fae 51 float gain_; // Gain factor for cascade form
MikamiUitOpen 0:04b43b777fae 52
MikamiUitOpen 0:04b43b777fae 53 void Butterworth();
MikamiUitOpen 0:04b43b777fae 54 void Bilinear(float fc);
MikamiUitOpen 0:04b43b777fae 55 void ToCascade(Type pb);
MikamiUitOpen 0:04b43b777fae 56 void GetGain(Type pb);
MikamiUitOpen 0:04b43b777fae 57 void GetCoefs(Coefs c[], float& gain);
MikamiUitOpen 0:04b43b777fae 58 };
MikamiUitOpen 0:04b43b777fae 59 }
MikamiUitOpen 0:04b43b777fae 60 #endif // BILINEAR_BUTTERWORTH_HPP