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.

MySpectrogram/AnalysisBase.hpp@6:5e21ac9f0550, 2017-02-05 (annotated)

Committer:
kenjiArai
Date:
Sun Feb 05 08:02:54 2017 +0000
Revision:
6:5e21ac9f0550
CW Decoder (Morse code decoder) 1st release version.  Only run on Nucleo-F446RE mbed board.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
kenjiArai 6:5e21ac9f0550 1 //-------------------------------------------------------
kenjiArai 6:5e21ac9f0550 2 // Base abstract class for spectrum analysis (Header)
kenjiArai 6:5e21ac9f0550 3 //
kenjiArai 6:5e21ac9f0550 4 // 2016/07/23, Copyright (c) 2016 MIKAMI, Naoki
kenjiArai 6:5e21ac9f0550 5 //-------------------------------------------------------
kenjiArai 6:5e21ac9f0550 6
kenjiArai 6:5e21ac9f0550 7 #ifndef BASE_ANALYZER_HPP
kenjiArai 6:5e21ac9f0550 8 #define BASE_ANALYZER_HPP
kenjiArai 6:5e21ac9f0550 9
kenjiArai 6:5e21ac9f0550 10 #include "Array.hpp"
kenjiArai 6:5e21ac9f0550 11 #include "fftReal.hpp"
kenjiArai 6:5e21ac9f0550 12 #include "Hamming.hpp"
kenjiArai 6:5e21ac9f0550 13
kenjiArai 6:5e21ac9f0550 14 namespace Mikami
kenjiArai 6:5e21ac9f0550 15 {
kenjiArai 6:5e21ac9f0550 16 class AnalyzerBase
kenjiArai 6:5e21ac9f0550 17 {
kenjiArai 6:5e21ac9f0550 18 public:
kenjiArai 6:5e21ac9f0550 19 // nData: Number of data to be analyzed
kenjiArai 6:5e21ac9f0550 20 // nFft: Number of FFT points
kenjiArai 6:5e21ac9f0550 21 // nUse: FFT, cepstrum: window width + zero padding
kenjiArai 6:5e21ac9f0550 22 // Linear prediction: window width
kenjiArai 6:5e21ac9f0550 23 AnalyzerBase(int nData, int nFft, int nUse);
kenjiArai 6:5e21ac9f0550 24 virtual ~AnalyzerBase() {}
kenjiArai 6:5e21ac9f0550 25 void Execute(const float xn[], float db[]);
kenjiArai 6:5e21ac9f0550 26
kenjiArai 6:5e21ac9f0550 27 protected:
kenjiArai 6:5e21ac9f0550 28 const int N_DATA_;
kenjiArai 6:5e21ac9f0550 29 const int N_FFT_;
kenjiArai 6:5e21ac9f0550 30
kenjiArai 6:5e21ac9f0550 31 FftReal fft_;
kenjiArai 6:5e21ac9f0550 32
kenjiArai 6:5e21ac9f0550 33 float Norm(Complex x)
kenjiArai 6:5e21ac9f0550 34 { return x.real()*x.real() + x.imag()*x.imag(); }
kenjiArai 6:5e21ac9f0550 35
kenjiArai 6:5e21ac9f0550 36 private:
kenjiArai 6:5e21ac9f0550 37 HammingWindow wHm_;
kenjiArai 6:5e21ac9f0550 38
kenjiArai 6:5e21ac9f0550 39 Array<float> xData_; // data to be analyzed
kenjiArai 6:5e21ac9f0550 40 Array<float> wData_; // windowd data
kenjiArai 6:5e21ac9f0550 41
kenjiArai 6:5e21ac9f0550 42 virtual void Analyze(const float wData[], float db[]) = 0;
kenjiArai 6:5e21ac9f0550 43
kenjiArai 6:5e21ac9f0550 44 // disallow copy constructor and assignment operator
kenjiArai 6:5e21ac9f0550 45 AnalyzerBase(const AnalyzerBase& );
kenjiArai 6:5e21ac9f0550 46 AnalyzerBase& operator=(const AnalyzerBase& );
kenjiArai 6:5e21ac9f0550 47 };
kenjiArai 6:5e21ac9f0550 48 }
kenjiArai 6:5e21ac9f0550 49 #endif // BASE_ANALYZER_HPP
kenjiArai 6:5e21ac9f0550 50