不韋 呂 / Mbed 2 deprecated UIT2_SpectrumAnalyzer

Real-time spectrum analyzer for ST Nucleo F401RE using Seeed Studio 2.8'' TFT Touch Shield V2.0.

Dependencies:   SeeedStudioTFTv2 UITDSP_ADDA UIT_FFT_Real mbed

SpactrumAnalysisClasses/Hamming.hpp@0:c5b026c2d07e, 2015-07-26 (annotated)

Committer:
MikamiUitOpen
Date:
Sun Jul 26 02:48:23 2015 +0000
Revision:
0:c5b026c2d07e
1

Who changed what in which revision?

UserRevisionLine numberNew contents of line
MikamiUitOpen 0:c5b026c2d07e 1 //-------------------------------------------------------------------
MikamiUitOpen 0:c5b026c2d07e 2 // Hamming windowing with zero-padding
MikamiUitOpen 0:c5b026c2d07e 3 // Copyright (c) 2014 MIKAMI, Naoki, 2014/12/21
MikamiUitOpen 0:c5b026c2d07e 4 //-------------------------------------------------------------------
MikamiUitOpen 0:c5b026c2d07e 5
MikamiUitOpen 0:c5b026c2d07e 6 #ifndef HAMMING_WINDOW_HPP
MikamiUitOpen 0:c5b026c2d07e 7 #define HAMMING_WINDOW_HPP
MikamiUitOpen 0:c5b026c2d07e 8
MikamiUitOpen 0:c5b026c2d07e 9 #include "mbed.h"
MikamiUitOpen 0:c5b026c2d07e 10
MikamiUitOpen 0:c5b026c2d07e 11 namespace Mikami
MikamiUitOpen 0:c5b026c2d07e 12 {
MikamiUitOpen 0:c5b026c2d07e 13 class HammingWindow
MikamiUitOpen 0:c5b026c2d07e 14 {
MikamiUitOpen 0:c5b026c2d07e 15 private:
MikamiUitOpen 0:c5b026c2d07e 16 const int N_;
MikamiUitOpen 0:c5b026c2d07e 17 const int NFFT_;
MikamiUitOpen 0:c5b026c2d07e 18
MikamiUitOpen 0:c5b026c2d07e 19 float* w_;
MikamiUitOpen 0:c5b026c2d07e 20
MikamiUitOpen 0:c5b026c2d07e 21 public:
MikamiUitOpen 0:c5b026c2d07e 22 // Constructor
MikamiUitOpen 0:c5b026c2d07e 23 HammingWindow(uint16_t nData, uint16_t nFft)
MikamiUitOpen 0:c5b026c2d07e 24 : N_(nData), NFFT_(nFft)
MikamiUitOpen 0:c5b026c2d07e 25 {
MikamiUitOpen 0:c5b026c2d07e 26 w_ = new float[nData];
MikamiUitOpen 0:c5b026c2d07e 27 float pi2L = 6.283185f/(float)nData;
MikamiUitOpen 0:c5b026c2d07e 28 for (int k=0; k<nData; k++)
MikamiUitOpen 0:c5b026c2d07e 29 w_[k] = 0.54f - 0.46f*cosf(k*pi2L);
MikamiUitOpen 0:c5b026c2d07e 30 }
MikamiUitOpen 0:c5b026c2d07e 31
MikamiUitOpen 0:c5b026c2d07e 32 // Destructor
MikamiUitOpen 0:c5b026c2d07e 33 ~HammingWindow() {delete[] w_;}
MikamiUitOpen 0:c5b026c2d07e 34
MikamiUitOpen 0:c5b026c2d07e 35 // Windowing
MikamiUitOpen 0:c5b026c2d07e 36 void Execute(const float x[], float y[])
MikamiUitOpen 0:c5b026c2d07e 37 {
MikamiUitOpen 0:c5b026c2d07e 38 for (int n=0; n<N_; n++) y[n] = x[n]*w_[n];
MikamiUitOpen 0:c5b026c2d07e 39 for (int n=N_; n<NFFT_; n++) y[n] = 0;
MikamiUitOpen 0:c5b026c2d07e 40 }
MikamiUitOpen 0:c5b026c2d07e 41 };
MikamiUitOpen 0:c5b026c2d07e 42 }
MikamiUitOpen 0:c5b026c2d07e 43 #endif // HAMMING_WINDOW_HPP
MikamiUitOpen 0:c5b026c2d07e 44