不韋 呂 / Mbed 2 deprecated F746_AudioOutQSPI

Output the audio signal with filtering by IIR filter in the Quad-SPI flash memory using onboard CODEC. QSPI フラッシュメモリのオーディオデータ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 で出力するプログラム．

Dependencies:   BSP_DISCO_F746NG_patch_fixed F746_GUI LCD_DISCO_F746NG QSPI_DISCO_F746NG TS_DISCO_F746NG mbed

MyClasses_Functions/BiquadFrqRespDrawer.hpp@1:a1be09c2533a, 2016-04-07 (annotated)

Committer:
MikamiUitOpen
Date:
Thu Apr 07 00:32:00 2016 +0000
Revision:
1:a1be09c2533a
Parent:
0:2eb96a7cf9b9 
2

Who changed what in which revision?

UserRevisionLine numberNew contents of line
MikamiUitOpen 0:2eb96a7cf9b9 1 //--------------------------------------------------------------
MikamiUitOpen 0:2eb96a7cf9b9 2 // BiquadFrqRespDrawer class (Derived class of FrqRespDrawer)
MikamiUitOpen 0:2eb96a7cf9b9 3 // 縦続形 IIR フィルタの周波数特性を描画するためのクラス
MikamiUitOpen 0:2eb96a7cf9b9 4 // このクラスは，FrqRespDrawer の派生クラス
MikamiUitOpen 0:2eb96a7cf9b9 5 //
MikamiUitOpen 0:2eb96a7cf9b9 6 // 2016/03/31, Copyright (c) 2016 MIKAMI, Naoki
MikamiUitOpen 0:2eb96a7cf9b9 7 //--------------------------------------------------------------
MikamiUitOpen 0:2eb96a7cf9b9 8
MikamiUitOpen 0:2eb96a7cf9b9 9 #ifndef F746_BILINEAR_FRQ_RESP_DRAWER_HPP
MikamiUitOpen 0:2eb96a7cf9b9 10 #define F746_BILINEAR_FRQ_RESP_DRAWER_HPP
MikamiUitOpen 0:2eb96a7cf9b9 11
MikamiUitOpen 0:2eb96a7cf9b9 12 #include "Biquad.hpp"
MikamiUitOpen 0:2eb96a7cf9b9 13 #include "FrquencyResponseDrawer.hpp"
MikamiUitOpen 0:2eb96a7cf9b9 14
MikamiUitOpen 0:2eb96a7cf9b9 15 namespace Mikami
MikamiUitOpen 0:2eb96a7cf9b9 16 {
MikamiUitOpen 0:2eb96a7cf9b9 17 class BiquadFrqRespDrawer : public FrqRespDrawer
MikamiUitOpen 0:2eb96a7cf9b9 18 {
MikamiUitOpen 0:2eb96a7cf9b9 19 public:
MikamiUitOpen 0:2eb96a7cf9b9 20 BiquadFrqRespDrawer(FrqRespDrawer::Params p)
MikamiUitOpen 0:2eb96a7cf9b9 21 : FrqRespDrawer(p) {}
MikamiUitOpen 0:2eb96a7cf9b9 22
MikamiUitOpen 0:2eb96a7cf9b9 23 // 次数とフィルタの係数設定
MikamiUitOpen 0:2eb96a7cf9b9 24 void SetParams(int order, float g0, Biquad::Coefs ck[])
MikamiUitOpen 0:2eb96a7cf9b9 25 {
MikamiUitOpen 0:2eb96a7cf9b9 26 order_ = order;
MikamiUitOpen 0:2eb96a7cf9b9 27 g0_ = g0;
MikamiUitOpen 0:2eb96a7cf9b9 28 ck_ = ck;
MikamiUitOpen 0:2eb96a7cf9b9 29 }
MikamiUitOpen 0:2eb96a7cf9b9 30
MikamiUitOpen 0:2eb96a7cf9b9 31 // 周波数応答の絶対値を返す関数, 引数: z^(-1)
MikamiUitOpen 0:2eb96a7cf9b9 32 virtual float AbsH_z(Complex u)
MikamiUitOpen 0:2eb96a7cf9b9 33 {
MikamiUitOpen 0:2eb96a7cf9b9 34 Complex h = g0_;
MikamiUitOpen 0:2eb96a7cf9b9 35 for (int k=0; k<order_/2; k++)
MikamiUitOpen 0:2eb96a7cf9b9 36 h = h*(1.0f + (ck_[k].b1 + ck_[k].b2*u)*u)
MikamiUitOpen 0:2eb96a7cf9b9 37 /((1.0f - (ck_[k].a1 + ck_[k].a2*u)*u));
MikamiUitOpen 0:2eb96a7cf9b9 38 return abs(h);
MikamiUitOpen 0:2eb96a7cf9b9 39 }
MikamiUitOpen 0:2eb96a7cf9b9 40
MikamiUitOpen 0:2eb96a7cf9b9 41 private:
MikamiUitOpen 0:2eb96a7cf9b9 42 int order_;
MikamiUitOpen 0:2eb96a7cf9b9 43 float g0_;
MikamiUitOpen 0:2eb96a7cf9b9 44 Biquad::Coefs *ck_;
MikamiUitOpen 0:2eb96a7cf9b9 45 };
MikamiUitOpen 0:2eb96a7cf9b9 46 }
MikamiUitOpen 0:2eb96a7cf9b9 47 #endif // F746_BILINEAR_FRQ_RESP_DRAWER_HPP