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/FFT_Analysis.hpp@0:c35b8a23a863, 2015-10-26 (annotated)
- Committer:
- MikamiUitOpen
- Date:
- Mon Oct 26 08:06:57 2015 +0000
- Revision:
- 0:c35b8a23a863
1
Who changed what in which revision?
User | Revision | Line number | New contents of line |
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MikamiUitOpen | 0:c35b8a23a863 | 1 | //------------------------------------------------------- |
MikamiUitOpen | 0:c35b8a23a863 | 2 | // Class for spectrum analysis using FFT (Header) |
MikamiUitOpen | 0:c35b8a23a863 | 3 | // Copyright (c) 2015 MIKAMI, Naoki, 2015/10/26 |
MikamiUitOpen | 0:c35b8a23a863 | 4 | //------------------------------------------------------- |
MikamiUitOpen | 0:c35b8a23a863 | 5 | |
MikamiUitOpen | 0:c35b8a23a863 | 6 | #ifndef FFT_ANALYZER_HPP |
MikamiUitOpen | 0:c35b8a23a863 | 7 | #define FFT_ANALYZER_HPP |
MikamiUitOpen | 0:c35b8a23a863 | 8 | |
MikamiUitOpen | 0:c35b8a23a863 | 9 | #include "fftReal.hpp" |
MikamiUitOpen | 0:c35b8a23a863 | 10 | #include "Hamming.hpp" |
MikamiUitOpen | 0:c35b8a23a863 | 11 | |
MikamiUitOpen | 0:c35b8a23a863 | 12 | namespace Mikami |
MikamiUitOpen | 0:c35b8a23a863 | 13 | { |
MikamiUitOpen | 0:c35b8a23a863 | 14 | class FftAnalyzer |
MikamiUitOpen | 0:c35b8a23a863 | 15 | { |
MikamiUitOpen | 0:c35b8a23a863 | 16 | public: |
MikamiUitOpen | 0:c35b8a23a863 | 17 | FftAnalyzer(int nData, int nFft); |
MikamiUitOpen | 0:c35b8a23a863 | 18 | ~FftAnalyzer(); |
MikamiUitOpen | 0:c35b8a23a863 | 19 | void Execute(float xn[], float db[]); |
MikamiUitOpen | 0:c35b8a23a863 | 20 | |
MikamiUitOpen | 0:c35b8a23a863 | 21 | private: |
MikamiUitOpen | 0:c35b8a23a863 | 22 | const int N_DATA_; |
MikamiUitOpen | 0:c35b8a23a863 | 23 | const int N_FFT_; |
MikamiUitOpen | 0:c35b8a23a863 | 24 | |
MikamiUitOpen | 0:c35b8a23a863 | 25 | HammingWindow hm_; |
MikamiUitOpen | 0:c35b8a23a863 | 26 | FftReal fft_; |
MikamiUitOpen | 0:c35b8a23a863 | 27 | |
MikamiUitOpen | 0:c35b8a23a863 | 28 | float* xData; // Data to be analyzed |
MikamiUitOpen | 0:c35b8a23a863 | 29 | float* xFft; // Input for FFT |
MikamiUitOpen | 0:c35b8a23a863 | 30 | Complex* yFft; // Output of FFT |
MikamiUitOpen | 0:c35b8a23a863 | 31 | float* normY; // Powerspectrum |
MikamiUitOpen | 0:c35b8a23a863 | 32 | |
MikamiUitOpen | 0:c35b8a23a863 | 33 | float Sqr(float x) { return x*x; } |
MikamiUitOpen | 0:c35b8a23a863 | 34 | }; |
MikamiUitOpen | 0:c35b8a23a863 | 35 | } |
MikamiUitOpen | 0:c35b8a23a863 | 36 | |
MikamiUitOpen | 0:c35b8a23a863 | 37 | #endif // FFT_ANALYZER_HPP |
MikamiUitOpen | 0:c35b8a23a863 | 38 |