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/LPC_Analysis.hpp@6:f385940fbdb1, 2018-10-09 (annotated)
- Committer:
- MikamiUitOpen
- Date:
- Tue Oct 09 10:34:47 2018 +0000
- Revision:
- 6:f385940fbdb1
- Parent:
- 0:c35b8a23a863
7
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 linear prediction (Header) |
MikamiUitOpen | 0:c35b8a23a863 | 3 | // Copyright (c) 2014 MIKAMI, Naoki, 2014/12/30 |
MikamiUitOpen | 0:c35b8a23a863 | 4 | //--------------------------------------------------------------- |
MikamiUitOpen | 0:c35b8a23a863 | 5 | |
MikamiUitOpen | 0:c35b8a23a863 | 6 | #ifndef LPC_ANALYZER_HPP |
MikamiUitOpen | 0:c35b8a23a863 | 7 | #define LPC_ANALYZER_HPP |
MikamiUitOpen | 0:c35b8a23a863 | 8 | |
MikamiUitOpen | 0:c35b8a23a863 | 9 | #include "fftReal.hpp" |
MikamiUitOpen | 0:c35b8a23a863 | 10 | #include "Hamming.hpp" |
MikamiUitOpen | 0:c35b8a23a863 | 11 | #include "LinearPrediction.hpp" |
MikamiUitOpen | 0:c35b8a23a863 | 12 | |
MikamiUitOpen | 0:c35b8a23a863 | 13 | namespace Mikami |
MikamiUitOpen | 0:c35b8a23a863 | 14 | { |
MikamiUitOpen | 0:c35b8a23a863 | 15 | class LpcAnalyzer |
MikamiUitOpen | 0:c35b8a23a863 | 16 | { |
MikamiUitOpen | 0:c35b8a23a863 | 17 | public: |
MikamiUitOpen | 0:c35b8a23a863 | 18 | LpcAnalyzer(int nData, int order, int nFft); |
MikamiUitOpen | 0:c35b8a23a863 | 19 | ~LpcAnalyzer(); |
MikamiUitOpen | 0:c35b8a23a863 | 20 | void Execute(float xn[], float db[]); |
MikamiUitOpen | 0:c35b8a23a863 | 21 | private: |
MikamiUitOpen | 0:c35b8a23a863 | 22 | const int N_DATA_; |
MikamiUitOpen | 0:c35b8a23a863 | 23 | const int ORDER_; |
MikamiUitOpen | 0:c35b8a23a863 | 24 | const int N_FFT_; |
MikamiUitOpen | 0:c35b8a23a863 | 25 | |
MikamiUitOpen | 0:c35b8a23a863 | 26 | HammingWindow hm_; |
MikamiUitOpen | 0:c35b8a23a863 | 27 | LinearPred lp_; |
MikamiUitOpen | 0:c35b8a23a863 | 28 | FftReal fft_; |
MikamiUitOpen | 0:c35b8a23a863 | 29 | |
MikamiUitOpen | 0:c35b8a23a863 | 30 | float* xData_; // Data to be analyzed |
MikamiUitOpen | 0:c35b8a23a863 | 31 | float* an_; |
MikamiUitOpen | 0:c35b8a23a863 | 32 | float* xFft_; // Input for FFT |
MikamiUitOpen | 0:c35b8a23a863 | 33 | Complex* yFft_; // Output of FFT |
MikamiUitOpen | 0:c35b8a23a863 | 34 | float* normY_; // Powerspectrum |
MikamiUitOpen | 0:c35b8a23a863 | 35 | |
MikamiUitOpen | 0:c35b8a23a863 | 36 | float Sqr(float x) { return x*x; } |
MikamiUitOpen | 0:c35b8a23a863 | 37 | }; |
MikamiUitOpen | 0:c35b8a23a863 | 38 | } |
MikamiUitOpen | 0:c35b8a23a863 | 39 | #endif // LPC_ANALYZER_HPP |
MikamiUitOpen | 0:c35b8a23a863 | 40 |