Integrated program of 4 different kinds of application programs for processing sound signal. 4種類のサウンド信号処理を統合したプログラム.
Dependencies: F746_GUI F746_SAI_IO FrequencyResponseDrawer SD_PlayerSkeleton UIT_FFT_Real
MySpectrogram/Hamming.hpp@16:d60e5187fd31, 2017-04-27 (annotated)
- Committer:
- MikamiUitOpen
- Date:
- Thu Apr 27 23:55:53 2017 +0000
- Revision:
- 16:d60e5187fd31
- Parent:
- 15:fac50dd1de44
17
Who changed what in which revision?
User | Revision | Line number | New contents of line |
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MikamiUitOpen | 15:fac50dd1de44 | 1 | //------------------------------------------------------------------- |
MikamiUitOpen | 15:fac50dd1de44 | 2 | // Hamming windowing with zero-padding |
MikamiUitOpen | 15:fac50dd1de44 | 3 | // |
MikamiUitOpen | 15:fac50dd1de44 | 4 | // 2017/04/10, Copyright (c) 2017 MIKAMI, Naoki |
MikamiUitOpen | 15:fac50dd1de44 | 5 | //------------------------------------------------------------------- |
MikamiUitOpen | 15:fac50dd1de44 | 6 | |
MikamiUitOpen | 15:fac50dd1de44 | 7 | #ifndef HAMMING_WINDOW_HPP |
MikamiUitOpen | 15:fac50dd1de44 | 8 | #define HAMMING_WINDOW_HPP |
MikamiUitOpen | 15:fac50dd1de44 | 9 | |
MikamiUitOpen | 15:fac50dd1de44 | 10 | #include "mbed.h" |
MikamiUitOpen | 15:fac50dd1de44 | 11 | #include "Array.hpp" |
MikamiUitOpen | 15:fac50dd1de44 | 12 | |
MikamiUitOpen | 15:fac50dd1de44 | 13 | namespace Mikami |
MikamiUitOpen | 15:fac50dd1de44 | 14 | { |
MikamiUitOpen | 15:fac50dd1de44 | 15 | class HammingWindow |
MikamiUitOpen | 15:fac50dd1de44 | 16 | { |
MikamiUitOpen | 15:fac50dd1de44 | 17 | public: |
MikamiUitOpen | 15:fac50dd1de44 | 18 | // Constructor |
MikamiUitOpen | 15:fac50dd1de44 | 19 | HammingWindow(uint16_t nData, uint16_t nFft) |
MikamiUitOpen | 15:fac50dd1de44 | 20 | : N_(nData), NFFT_(nFft), w_(nData) |
MikamiUitOpen | 15:fac50dd1de44 | 21 | { |
MikamiUitOpen | 15:fac50dd1de44 | 22 | float pi2L = 6.283185f/(float)nData; |
MikamiUitOpen | 15:fac50dd1de44 | 23 | for (int k=0; k<nData; k++) |
MikamiUitOpen | 15:fac50dd1de44 | 24 | w_[k] = 0.54f - 0.46f*cosf(k*pi2L); |
MikamiUitOpen | 15:fac50dd1de44 | 25 | } |
MikamiUitOpen | 15:fac50dd1de44 | 26 | |
MikamiUitOpen | 15:fac50dd1de44 | 27 | // Windowing |
MikamiUitOpen | 15:fac50dd1de44 | 28 | void Execute(const float x[], float y[]) |
MikamiUitOpen | 15:fac50dd1de44 | 29 | { |
MikamiUitOpen | 15:fac50dd1de44 | 30 | for (int n=0; n<N_; n++) y[n] = x[n]*w_[n]; |
MikamiUitOpen | 15:fac50dd1de44 | 31 | for (int n=N_; n<NFFT_; n++) y[n] = 0; |
MikamiUitOpen | 15:fac50dd1de44 | 32 | } |
MikamiUitOpen | 15:fac50dd1de44 | 33 | |
MikamiUitOpen | 15:fac50dd1de44 | 34 | private: |
MikamiUitOpen | 15:fac50dd1de44 | 35 | const int N_; |
MikamiUitOpen | 15:fac50dd1de44 | 36 | const int NFFT_; |
MikamiUitOpen | 15:fac50dd1de44 | 37 | |
MikamiUitOpen | 15:fac50dd1de44 | 38 | Array<float> w_; |
MikamiUitOpen | 15:fac50dd1de44 | 39 | |
MikamiUitOpen | 15:fac50dd1de44 | 40 | // disallow copy constructor and assignment operator |
MikamiUitOpen | 15:fac50dd1de44 | 41 | HammingWindow(const HammingWindow& ); |
MikamiUitOpen | 15:fac50dd1de44 | 42 | HammingWindow& operator=(const HammingWindow& ); |
MikamiUitOpen | 15:fac50dd1de44 | 43 | }; |
MikamiUitOpen | 15:fac50dd1de44 | 44 | } |
MikamiUitOpen | 15:fac50dd1de44 | 45 | #endif // HAMMING_WINDOW_HPP |