www.pudn.com > waveinFFTdemo.rar > Fourier.h

// Fourier.h: interface for the Fourier class. 
// 
////////////////////////////////////////////////////////////////////// 
 
#if !defined(AFX_FOURIER_H__6939C9A4_8D93_41A3_9521_3B863957EB8E__INCLUDED_) 
#define AFX_FOURIER_H__6939C9A4_8D93_41A3_9521_3B863957EB8E__INCLUDED_ 
 
#if _MSC_VER > 1000 
#pragma once 
#endif // _MSC_VER > 1000 
 
/* 
 * fft.h 
 * 
 * loic fonteneau 15-feb-2001 
 * Perform discrete FFT 
 * 
 * Original code : Don Cross  
 * http://www.intersrv.com/~dcross/fft.html 
 * 
 */ 
 
 
/////////////////////////// 
//  function prototypes  // 
/////////////////////////// 
 
void fft_double(unsigned int p_nSamples, bool p_bInverseTransform, double *p_lpRealIn, double *p_lpImagIn, double *p_lpRealOut, double *p_lpImagOut); 
 
bool IsPowerOfTwo(unsigned int p_nX); 
 
unsigned int NumberOfBitsNeeded(unsigned int p_nSamples); 
 
unsigned int ReverseBits(unsigned int p_nIndex, unsigned int p_nBits); 
 
double Index_to_frequency(unsigned int p_nBaseFreq, unsigned int p_nSamples, unsigned int p_nIndex); 
 
 
 
///////////////////////////// 
//  constantes-definition  // 
///////////////////////////// 
 
#define  PI  (3.14159265358979323846) 
 
 
#endif // !defined(AFX_FOURIER_H__6939C9A4_8D93_41A3_9521_3B863957EB8E__INCLUDED_)