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.

Diff: MySpectrogram/AnalysisBase.cpp

Revision:
6:5e21ac9f0550
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/MySpectrogram/AnalysisBase.cpp	Sun Feb 05 08:02:54 2017 +0000
@@ -0,0 +1,27 @@
+//-------------------------------------------------------
+//  Base abstract class for spectrum analysis
+//
+//  2016/07/23, Copyright (c) 2016 MIKAMI, Naoki
+//-------------------------------------------------------
+
+#include "AnalysisBase.hpp"
+
+namespace Mikami
+{
+    AnalyzerBase::AnalyzerBase(int nData, int nFft, int nUse)
+        : N_DATA_(nData), N_FFT_(nFft),
+          fft_(nFft), wHm_(nData-1, nUse),
+          xData_(nUse), wData_(nUse) {}
+
+    void AnalyzerBase::Execute(const float xn[], float db[])
+    {
+        // Differencing
+        for (int n=0; n<N_DATA_-1; n++)
+            xData_[n] = xn[n+1] - 0.8f*xn[n];
+            
+        // Windowing
+        wHm_.Execute(xData_, wData_);
+            
+        Analyze(wData_, db);
+    }
+}