Kenji Arai / Mbed OS CW_Decoder_using_FFT_on_F446

CW Decoder (Morse code decoder) 1st release version. Only run on Nucleo-F446RE mbed board.

Dependencies:   Array_Matrix F446_AD_DA ST7565_SPI_LCD TextLCD UIT_FFT_Real

Fork of F446_MySoundMachine by 不韋 呂

Base on F446_MySoundMachine program created by 不韋 呂-san.
Thanks to 不韋 呂-san making fundamental part such as FFT and ADC high speed interrupt driven program.
I just combined LCD and show CW code.

SignalProcessing/VariableLpHp.hpp@5:503bd366fd73, 2017-01-31 (annotated)

Committer:
MikamiUitOpen
Date:
Tue Jan 31 12:52:35 2017 +0000
Revision:
5:503bd366fd73
Parent:
4:2f06a5893e4a 
6

Who changed what in which revision?

UserRevisionLine numberNew contents of line
MikamiUitOpen 0:fa74b1130cc3 1 //--------------------------------------------------------------
MikamiUitOpen 0:fa74b1130cc3 2 // 遮断周波数可変フィルタ，LPF と HPF
MikamiUitOpen 0:fa74b1130cc3 3 //
MikamiUitOpen 4:2f06a5893e4a 4 // 2017/01/30, Copyright (c) 2017 MIKAMI, Naoki
MikamiUitOpen 0:fa74b1130cc3 5 //--------------------------------------------------------------
MikamiUitOpen 0:fa74b1130cc3 6
MikamiUitOpen 0:fa74b1130cc3 7 #ifndef VARIABLE_LOWPASS_HIGHPASS_FILTER_HPP
MikamiUitOpen 0:fa74b1130cc3 8 #define VARIABLE_LOWPASS_HIGHPASS_FILTER_HPP
MikamiUitOpen 0:fa74b1130cc3 9
MikamiUitOpen 0:fa74b1130cc3 10 #include "IIR_Cascade.hpp"
MikamiUitOpen 0:fa74b1130cc3 11 #include "SignalProcessing.hpp"
MikamiUitOpen 0:fa74b1130cc3 12 #include "BilinearDesignLH.hpp"
MikamiUitOpen 0:fa74b1130cc3 13 #include "Array.hpp"
MikamiUitOpen 0:fa74b1130cc3 14 using namespace Mikami;
MikamiUitOpen 0:fa74b1130cc3 15
MikamiUitOpen 0:fa74b1130cc3 16 class VariableLpHp : public SignalProcessing
MikamiUitOpen 0:fa74b1130cc3 17 {
MikamiUitOpen 0:fa74b1130cc3 18 public:
MikamiUitOpen 0:fa74b1130cc3 19 VariableLpHp(int order, float fs)
MikamiUitOpen 0:fa74b1130cc3 20 : ORDER2_(order/2), coefs_(order/2), coefsIir_(order/2),
MikamiUitOpen 0:fa74b1130cc3 21 designer_(order, fs), filter_(order) {}
MikamiUitOpen 0:fa74b1130cc3 22
MikamiUitOpen 0:fa74b1130cc3 23 virtual float Execute(float xn1, float xn2)
MikamiUitOpen 0:fa74b1130cc3 24 { return filter_.Execute((xn1 + xn2)*0.5f); }
MikamiUitOpen 0:fa74b1130cc3 25
MikamiUitOpen 0:fa74b1130cc3 26 void Design(float fc, BilinearDesign::Type passBand)
MikamiUitOpen 0:fa74b1130cc3 27 {
MikamiUitOpen 0:fa74b1130cc3 28 float g0;
MikamiUitOpen 0:fa74b1130cc3 29 designer_.Execute(fc, passBand, coefs_, g0);
MikamiUitOpen 0:fa74b1130cc3 30 for (int n=0; n<ORDER2_; n++)
MikamiUitOpen 4:2f06a5893e4a 31 coefsIir_[n] = *(Biquad::Coefs *)&coefs_[n];
MikamiUitOpen 4:2f06a5893e4a 32
MikamiUitOpen 0:fa74b1130cc3 33 filter_.SetCoefs(g0, coefsIir_);
MikamiUitOpen 0:fa74b1130cc3 34 filter_.Clear();
MikamiUitOpen 0:fa74b1130cc3 35 }
MikamiUitOpen 5:503bd366fd73 36
MikamiUitOpen 0:fa74b1130cc3 37 private:
MikamiUitOpen 0:fa74b1130cc3 38 const int ORDER2_;
MikamiUitOpen 5:503bd366fd73 39
MikamiUitOpen 0:fa74b1130cc3 40 Array<BilinearDesign::Coefs> coefs_;
MikamiUitOpen 0:fa74b1130cc3 41 Array<Biquad::Coefs> coefsIir_;
MikamiUitOpen 0:fa74b1130cc3 42
MikamiUitOpen 0:fa74b1130cc3 43 BilinearDesign designer_;
MikamiUitOpen 0:fa74b1130cc3 44 IirCascade filter_;
MikamiUitOpen 0:fa74b1130cc3 45 };
MikamiUitOpen 4:2f06a5893e4a 46 #endif // VARIABLE_LOWPASS_HIGHPASS_FILTER_HPP