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
MyClasses_Functions/Hamming.hpp
- Committer:
- MikamiUitOpen
- Date:
- 2016-05-22
- Revision:
- 0:9470a174c910
- Child:
- 2:1f092ac020e1
File content as of revision 0:9470a174c910:
//------------------------------------------------------------------- // Hamming windowing with zero-padding // // 2015/12/17, Copyright (c) 2015 MIKAMI, Naoki //------------------------------------------------------------------- #ifndef HAMMING_WINDOW_HPP #define HAMMING_WINDOW_HPP #include "mbed.h" namespace Mikami { class HammingWindow { public: // Constructor HammingWindow(uint16_t nData, uint16_t nFft) : N_(nData), NFFT_(nFft), w_(new float[nData]) { float pi2L = 6.283185f/(float)nData; for (int k=0; k<nData; k++) w_[k] = 0.54f - 0.46f*cosf(k*pi2L); } // Destructor ~HammingWindow() {delete[] w_;} // Windowing void Execute(const float x[], float y[]) { for (int n=0; n<N_; n++) y[n] = x[n]*w_[n]; for (int n=N_; n<NFFT_; n++) y[n] = 0; } private: const int N_; const int NFFT_; float* w_; // disallow copy constructor and assignment operator HammingWindow(const HammingWindow& ); HammingWindow& operator=(const HammingWindow& ); }; } #endif // HAMMING_WINDOW_HPP