FFTReal Class Reference

#include <FFT.h>

Public Member Functions
	FFTReal (int nsamples)
	~FFTReal ()
void	forward (const double *realIn, double *realOut, double *imagOut)
void	forwardMagnitude (const double *realIn, double *magOut)
void	inverse (const double *realIn, const double *imagIn, double *realOut)

Private Attributes
D *	m_d

Detailed Description

Definition at line 52 of file FFT.h.

Constructor & Destructor Documentation

FFTReal()

FFTReal::FFTReal

(

int

nsamples

)

Construct an FFT object to carry out real-to-complex transforms of size nsamples. nsamples does not have to be a power of two, but it does have to be even. (Use the complex-complex FFT above if you need an odd FFT size. This constructor will throw std::invalid_argument if nsamples is odd.)

~FFTReal()

FFTReal::~FFTReal

(

)

Member Function Documentation

forward()

void FFTReal::forward	(	const double *	realIn,
		double *	realOut,
		double *	imagOut
	)

Carry out a forward real-to-complex transform of size nsamples, where nsamples is the value provided to the constructor above.

realIn, realOut, and imagOut must point to (enough space for) nsamples values. For consistency with the FFT class above, and compatibility with existing code, the conjugate half of the output is returned even though it is redundant.

forwardMagnitude()

void FFTReal::forwardMagnitude	(	const double *	realIn,
		double *	magOut
	)

Carry out a forward real-to-complex transform of size nsamples, where nsamples is the value provided to the constructor above. Return only the magnitudes of the complex output values.

realIn and magOut must point to (enough space for) nsamples values. For consistency with the FFT class above, and compatibility with existing code, the conjugate half of the output is returned even though it is redundant.

inverse()

void FFTReal::inverse	(	const double *	realIn,
		const double *	imagIn,
		double *	realOut
	)

Carry out an inverse real transform (i.e. complex-to-real) of size nsamples, where nsamples is the value provided to the constructor above.

realIn and imagIn should point to at least nsamples/2+1 values; if more are provided, only the first nsamples/2+1 values of each will be used (the conjugate half will always be deduced from the first nsamples/2+1 rather than being read from the input data). realOut should point to enough space to receive nsamples values.

The inverse transform is scaled by 1/nsamples.

Member Data Documentation

m_d

D* FFTReal::m_d

private

Definition at line 108 of file FFT.h.

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The documentation for this class was generated from the following file:

• FFT.h