Realtime spectrogram for DISCO-F746NG. On-board MEMS microphone is used for input sound signal. リアルタイムスペクトログラム.入力:MEMSマイク
Dependencies: F746_GUI F746_SAI_IO UIT_FFT_Real
MySpectrogram/Hamming.hpp@3:6a2c8ff46f73, 2016-08-15 (annotated)
- Committer:
- MikamiUitOpen
- Date:
- Mon Aug 15 06:51:01 2016 +0000
- Revision:
- 3:6a2c8ff46f73
- Parent:
- MyClasses_Functions/Hamming.hpp@2:1f092ac020e1
- Child:
- 6:b3885567877c
4
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
MikamiUitOpen | 0:9470a174c910 | 1 | //------------------------------------------------------------------- |
MikamiUitOpen | 0:9470a174c910 | 2 | // Hamming windowing with zero-padding |
MikamiUitOpen | 0:9470a174c910 | 3 | // |
MikamiUitOpen | 2:1f092ac020e1 | 4 | // 2016/07/23, Copyright (c) 2016 MIKAMI, Naoki |
MikamiUitOpen | 0:9470a174c910 | 5 | //------------------------------------------------------------------- |
MikamiUitOpen | 0:9470a174c910 | 6 | |
MikamiUitOpen | 0:9470a174c910 | 7 | #ifndef HAMMING_WINDOW_HPP |
MikamiUitOpen | 0:9470a174c910 | 8 | #define HAMMING_WINDOW_HPP |
MikamiUitOpen | 0:9470a174c910 | 9 | |
MikamiUitOpen | 0:9470a174c910 | 10 | #include "mbed.h" |
MikamiUitOpen | 2:1f092ac020e1 | 11 | #include "Array.hpp" |
MikamiUitOpen | 0:9470a174c910 | 12 | |
MikamiUitOpen | 0:9470a174c910 | 13 | namespace Mikami |
MikamiUitOpen | 0:9470a174c910 | 14 | { |
MikamiUitOpen | 0:9470a174c910 | 15 | class HammingWindow |
MikamiUitOpen | 0:9470a174c910 | 16 | { |
MikamiUitOpen | 0:9470a174c910 | 17 | public: |
MikamiUitOpen | 0:9470a174c910 | 18 | // Constructor |
MikamiUitOpen | 0:9470a174c910 | 19 | HammingWindow(uint16_t nData, uint16_t nFft) |
MikamiUitOpen | 2:1f092ac020e1 | 20 | : N_(nData), NFFT_(nFft), w_(nData) |
MikamiUitOpen | 0:9470a174c910 | 21 | { |
MikamiUitOpen | 0:9470a174c910 | 22 | float pi2L = 6.283185f/(float)nData; |
MikamiUitOpen | 0:9470a174c910 | 23 | for (int k=0; k<nData; k++) |
MikamiUitOpen | 0:9470a174c910 | 24 | w_[k] = 0.54f - 0.46f*cosf(k*pi2L); |
MikamiUitOpen | 0:9470a174c910 | 25 | } |
MikamiUitOpen | 0:9470a174c910 | 26 | |
MikamiUitOpen | 0:9470a174c910 | 27 | // Destructor |
MikamiUitOpen | 2:1f092ac020e1 | 28 | virtual ~HammingWindow() {} |
MikamiUitOpen | 0:9470a174c910 | 29 | |
MikamiUitOpen | 0:9470a174c910 | 30 | // Windowing |
MikamiUitOpen | 0:9470a174c910 | 31 | void Execute(const float x[], float y[]) |
MikamiUitOpen | 0:9470a174c910 | 32 | { |
MikamiUitOpen | 0:9470a174c910 | 33 | for (int n=0; n<N_; n++) y[n] = x[n]*w_[n]; |
MikamiUitOpen | 0:9470a174c910 | 34 | for (int n=N_; n<NFFT_; n++) y[n] = 0; |
MikamiUitOpen | 0:9470a174c910 | 35 | } |
MikamiUitOpen | 0:9470a174c910 | 36 | |
MikamiUitOpen | 0:9470a174c910 | 37 | private: |
MikamiUitOpen | 0:9470a174c910 | 38 | const int N_; |
MikamiUitOpen | 0:9470a174c910 | 39 | const int NFFT_; |
MikamiUitOpen | 0:9470a174c910 | 40 | |
MikamiUitOpen | 2:1f092ac020e1 | 41 | Array<float> w_; |
MikamiUitOpen | 0:9470a174c910 | 42 | |
MikamiUitOpen | 0:9470a174c910 | 43 | // disallow copy constructor and assignment operator |
MikamiUitOpen | 0:9470a174c910 | 44 | HammingWindow(const HammingWindow& ); |
MikamiUitOpen | 0:9470a174c910 | 45 | HammingWindow& operator=(const HammingWindow& ); |
MikamiUitOpen | 0:9470a174c910 | 46 | }; |
MikamiUitOpen | 0:9470a174c910 | 47 | } |
MikamiUitOpen | 0:9470a174c910 | 48 | #endif // HAMMING_WINDOW_HPP |