/Users/richardeakin/projects/libsms/trunk/src/transforms.c File Reference

routines for different Fast Fourier Transform Algorithms More...

#include "sms.h"
#include "OOURA.h"

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Functions
void	sms_fft (int sizeFft, sfloat *pArray)
	Forward Fast Fourier Transform.
void	sms_ifft (int sizeFft, sfloat *pArray)
	Inverse Forward Fast Fourier Transform.
Variables
static int	ip [NMAXSQRT+2]
static sfloat	w [NMAX *5/4]

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Detailed Description

routines for different Fast Fourier Transform Algorithms

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Function Documentation

void sms_fft	(	int	sizeFft,
		sfloat *	pArray
	)

Forward Fast Fourier Transform.

function to call the OOURA routines to calculate the forward FFT. Operation is in place.

Todo:

if sizeFft != power of 2, there is a silent crash.. cuidado!

Parameters:

	sizeFft	size of the FFT in samples (must be a power of 2 >= 2)
	pArray	pointer to real array (n >= 2, n = power of 2)

References ip, rdft(), and w.

Referenced by sms_dCepstrumEnvelope(), sms_spectrum(), and sms_spectrumMag().

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void sms_ifft	(	int	sizeFft,
		sfloat *	pArray
	)

Inverse Forward Fast Fourier Transform.

function to call the OOURA routines to calculate the Inverse FFT. Operation is in place.

Parameters:

	sizeFft	size of the FFT in samples (must be a power of 2 >= 2)
	pArray	pointer to real array (n >= 2, n = power of 2)

References ip, rdft(), and w.

Referenced by SineSynthIFFT(), sms_invQuickSpectrumW(), sms_invSpectrum(), and sms_synthesize().

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Variable Documentation

int ip[NMAXSQRT+2] [static]

Referenced by sms_fft(), and sms_ifft().

sfloat w[NMAX *5/4] [static]

Referenced by sms_fft(), and sms_ifft().