Kenji Arai
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.
Diff: SignalProcessing/Biquad.hpp
- Revision:
- 6:5e21ac9f0550
- Parent:
- 5:503bd366fd73
--- a/SignalProcessing/Biquad.hpp Tue Jan 31 12:52:35 2017 +0000
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,60 +0,0 @@
-//--------------------------------------------------------------
-// 縦続形 IIR フィルタで使う 1D タイプの 2 次のフィルタ
-// Biquad filter of 1D type for IIR filter of cascade structure
-// このクラスでは，係数は実行中に書き換えられることを想定している
-//
-// u[n] = x[n] + a1*u[n-1] + a2*u[n-2]
-// y[n] = u[n] + b1*u[n-1] + b2*u[n-2]
-// x[n] : input signal
-// y[n] : output signal
-// b0 = 1
-//
-// 2017/01/26, Copyright (c) 2017 MIKAMI, Naoki
-//--------------------------------------------------------------
-
-#ifndef IIR_BIQUAD_HPP
-#define IIR_BIQUAD_HPP
-
-#include "mbed.h"
-
-// 2nd order IIR filter
-namespace Mikami
-{
- class Biquad
- {
- public:
- struct Coefs { float a1, a2, b1, b2; };
-
- Biquad(const Coefs ck = (Coefs){0, 0, 0, 0})
- {
- SetCoefs(ck);
- Clear();
- }
-
- void SetCoefs(const Coefs cf) { cf_ = cf; }
-
- void GetCoefs(Coefs &cf) { cf = cf_; }
-
- float Execute(float xn)
- {
- float un = xn + cf_.a1*un1_ + cf_.a2*un2_;
- float yn = un + cf_.b1*un1_ + cf_.b2*un2_;
-
- un2_ = un1_;
- un1_ = un;
-
- return yn;
- }
-
- void Clear() { un1_ = un2_ = 0; }
-
- private:
- Coefs cf_;
- float un1_, un2_;
-
- // disallow copy constructor and assignment operator
- Biquad(const Biquad&);
- Biquad& operator=(const Biquad&);
- };
-}
-#endif // IIR_BIQUAD_HPP