Mladen Adamovic / UIT_FFT_Real

Final version.

Dependents:   Spectrogram

Fork of UIT_FFT_Real by 不韋 呂

fftReal.hpp@4:2e5de15ed0c2, 2017-08-30 (annotated)

Committer:
mladjo1993
Date:
Wed Aug 30 07:43:21 2017 +0000
Revision:
4:2e5de15ed0c2
Parent:
3:7e761912ef10 
Final version.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mladjo1993 3:7e761912ef10 1 /********************************************************
mladjo1993 3:7e761912ef10 2 * FFT class for real data ---- Header
mladjo1993 3:7e761912ef10 3 * This class can execute FFT and IFFT
mladjo1993 3:7e761912ef10 4 *
mladjo1993 3:7e761912ef10 5 * Mladen Adamovic, 3326/2016
mladjo1993 3:7e761912ef10 6 ********************************************************/
MikamiUitOpen 0:982a9acf3a07 7
MikamiUitOpen 0:982a9acf3a07 8 #ifndef FFT_REAL_HPP
MikamiUitOpen 0:982a9acf3a07 9 #define FFT_REAL_HPP
MikamiUitOpen 0:982a9acf3a07 10
MikamiUitOpen 0:982a9acf3a07 11 #include "mbed.h"
MikamiUitOpen 0:982a9acf3a07 12 #include <complex> // requisite for complex
MikamiUitOpen 0:982a9acf3a07 13
mladjo1993 4:2e5de15ed0c2 14 namespace etf
MikamiUitOpen 0:982a9acf3a07 15 {
MikamiUitOpen 0:982a9acf3a07 16 typedef complex<float> Complex; // define "Complex"
MikamiUitOpen 0:982a9acf3a07 17
MikamiUitOpen 0:982a9acf3a07 18 class FftReal
MikamiUitOpen 0:982a9acf3a07 19 {
MikamiUitOpen 2:9649d0e2bb4a 20 public:
MikamiUitOpen 2:9649d0e2bb4a 21 // Constructor
MikamiUitOpen 2:9649d0e2bb4a 22 explicit FftReal(int16_t n);
MikamiUitOpen 2:9649d0e2bb4a 23 // Destructor
MikamiUitOpen 2:9649d0e2bb4a 24 ~FftReal();
MikamiUitOpen 2:9649d0e2bb4a 25 // Execute FFT
MikamiUitOpen 2:9649d0e2bb4a 26 void Execute(const float x[], Complex y[]);
MikamiUitOpen 2:9649d0e2bb4a 27 // Execute IFFT
MikamiUitOpen 2:9649d0e2bb4a 28 void ExecuteIfft(const Complex y[], float x[]);
MikamiUitOpen 2:9649d0e2bb4a 29
MikamiUitOpen 0:982a9acf3a07 30 private:
MikamiUitOpen 0:982a9acf3a07 31 const int N_FFT_;
MikamiUitOpen 0:982a9acf3a07 32 const float N_INV_;
MikamiUitOpen 0:982a9acf3a07 33
MikamiUitOpen 0:982a9acf3a07 34 Complex* wTable_; // twiddle factor
MikamiUitOpen 0:982a9acf3a07 35 uint16_t* bTable_; // for bit reversal
MikamiUitOpen 0:982a9acf3a07 36 Complex* u_; // working area
MikamiUitOpen 0:982a9acf3a07 37
MikamiUitOpen 0:982a9acf3a07 38 // Processing except for last stage
MikamiUitOpen 1:559a63853f3f 39 void ExcludeLastStage();
MikamiUitOpen 0:982a9acf3a07 40 // Use for reordering of rit reversal in IFFT
MikamiUitOpen 0:982a9acf3a07 41 int Index(int n) { return (N_FFT_-bTable_[n]); }
MikamiUitOpen 0:982a9acf3a07 42
MikamiUitOpen 2:9649d0e2bb4a 43 // disallow copy constructor and assignment operator
MikamiUitOpen 0:982a9acf3a07 44 FftReal(const FftReal& );
MikamiUitOpen 0:982a9acf3a07 45 FftReal& operator=(const FftReal& );
MikamiUitOpen 0:982a9acf3a07 46 };
MikamiUitOpen 0:982a9acf3a07 47 }
MikamiUitOpen 0:982a9acf3a07 48 #endif // FFT_REAL_HPP