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Fft.h
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Fft.h
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//Copyright+LGPL
//-----------------------------------------------------------------------------------------------------------------------------------------------
// Copyright 2000-2013 Makoto Mori, Nobuyuki Oba
//-----------------------------------------------------------------------------------------------------------------------------------------------
// This file is part of MMVARI.
// MMVARI is free software: you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License
// as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
// MMVARI is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
// You should have received a copy of the GNU Lesser General Public License along with MMTTY. If not, see
// <http://www.gnu.org/licenses/>.
//-----------------------------------------------------------------------------------------------------------------------------------------------
#ifndef FFT_H
#define FFT_H
//---------------------------------------------------------------------------
extern int FFT_SIZE;
//#define FFT_SIZE 2048
#define FFT_BUFSIZE 2048
#define SQRT_FFT_SIZE 46//sqrt(2048)
class CFFT
{
public:
__fastcall CFFT();
virtual __fastcall ~CFFT();
void __fastcall InitFFT(void);
int m_FFTGain;
int m_FFTDIS;
void __fastcall Calc(double * InBuf, int size, double gain, int stg, int* OutBuf);
inline void __fastcall ClearStg(void){
memset(pStgBuf, 0, sizeof(double[FFT_BUFSIZE]));
}
private:
BOOL m_StgSW;
int m_StgSize;
double m_StgScale;
double m_StgK;
double *m_tSinCos;
double *m_tWindow;
double *pStgBuf;
int *m_Work;
void __fastcall makewt(int nw, int *ip, double *w);
void __fastcall makect(int nc, int *ip, double *c);
void __fastcall bitrv2(int n, int *ip, double *a);
void __fastcall cftfsub(int n, double *a, double *w);
void __fastcall rftfsub(int n, double *a, int nc, double *c);
void __fastcall cft1st(int n, double *a, double *w);
void __fastcall cftmdl(int n, int l, double *a, double *w);
};
#endif