![](/media/cache/img/default_profile.jpg.50x50_q85.jpg)
Spectrum analyzer using DISCO-F746NG. Spectrum is calculated by FFT or linear prediction. The vowel data is in "vowel_data.hpp"
Dependencies: BSP_DISCO_F746NG LCD_DISCO_F746NG TS_DISCO_F746NG UIT_FFT_Real mbed BUTTON_GROUP
SpactrumAnalysisClasses/Hamming.hpp
- Committer:
- MikamiUitOpen
- Date:
- 2015-10-26
- Revision:
- 0:c35b8a23a863
File content as of revision 0:c35b8a23a863:
//------------------------------------------------------------------- // Hamming windowing with zero-padding // Copyright (c) 2014 MIKAMI, Naoki, 2014/12/21 //------------------------------------------------------------------- #ifndef HAMMING_WINDOW_HPP #define HAMMING_WINDOW_HPP #include "mbed.h" namespace Mikami { class HammingWindow { private: const int N_; const int NFFT_; float* w_; 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; } }; } #endif // HAMMING_WINDOW_HPP