MHASignal::fft_t Class Reference

Public Member Functions
	fft_t (const unsigned int &)
	~fft_t ()
void	wave2spec (const mha_wave_t *, mha_spec_t *, bool swap)
	fast fourier transform. More...
void	spec2wave (const mha_spec_t *, mha_wave_t *)
void	spec2wave (const mha_spec_t *, mha_wave_t *, unsigned int offset)
	wave may have fewer number of frames than needed for a complete iFFT. More...
void	forward (mha_spec_t *sIn, mha_spec_t *sOut)
void	backward (mha_spec_t *sIn, mha_spec_t *sOut)
void	wave2spec_scale (const mha_wave_t *, mha_spec_t *, bool swap)
void	spec2wave_scale (const mha_spec_t *, mha_wave_t *)
void	forward_scale (mha_spec_t *sIn, mha_spec_t *sOut)
void	backward_scale (mha_spec_t *sIn, mha_spec_t *sOut)

Private Member Functions
void	sort_fftw2spec (fftw_real *s_fftw, mha_spec_t *s_spec, unsigned int ch)
	Arrange the order of an fftw spectrum to the internal order. More...
void	sort_spec2fftw (fftw_real *s_fftw, const mha_spec_t *s_spec, unsigned int ch)
	Arrange the order of an internal spectrum to the fftw order. More...

Private Attributes
unsigned int	nfft
unsigned int	n_re
unsigned int	n_im
mha_real_t	scale
mha_real_t *	buf_in
mha_real_t *	buf_out
rfftw_plan	fftw_plan_wave2spec
rfftw_plan	fftw_plan_spec2wave
fftw_plan	fftw_plan_fft
fftw_plan	fftw_plan_ifft

Constructor & Destructor Documentation

fft_t()

MHASignal::fft_t::fft_t

(

const unsigned int &

n

)

~fft_t()

MHASignal::fft_t::~fft_t

(

)

Member Function Documentation

wave2spec()

void MHASignal::fft_t::wave2spec	(	const mha_wave_t *	wave,
		mha_spec_t *	spec,
		bool	swap
	)

fast fourier transform.

if swap is set, the buffer halfes of the wave signal are exchanged before computing the fft.

spec2wave() [1/2]

void MHASignal::fft_t::spec2wave	(	const mha_spec_t *	spec,
		mha_wave_t *	wave
	)

spec2wave() [2/2]

void MHASignal::fft_t::spec2wave	(	const mha_spec_t *	spec,
		mha_wave_t *	wave,
		unsigned int	offset
	)

wave may have fewer number of frames than needed for a complete iFFT.

Only as many frames are written into wave as fit, starting with offset offset of the complete iFFT.

forward()

void MHASignal::fft_t::forward	(	mha_spec_t *	sIn,
		mha_spec_t *	sOut
	)

backward()

void MHASignal::fft_t::backward	(	mha_spec_t *	sIn,
		mha_spec_t *	sOut
	)

wave2spec_scale()

void MHASignal::fft_t::wave2spec_scale	(	const mha_wave_t *	wave,
		mha_spec_t *	spec,
		bool	swap
	)

spec2wave_scale()

void MHASignal::fft_t::spec2wave_scale	(	const mha_spec_t *	spec,
		mha_wave_t *	wave
	)

forward_scale()

void MHASignal::fft_t::forward_scale	(	mha_spec_t *	sIn,
		mha_spec_t *	sOut
	)

backward_scale()

void MHASignal::fft_t::backward_scale	(	mha_spec_t *	sIn,
		mha_spec_t *	sOut
	)

sort_fftw2spec()

void MHASignal::fft_t::sort_fftw2spec ( fftw_real *  s_fftw, mha_spec_t *  s_spec, unsigned int  ch  )

private

Arrange the order of an fftw spectrum to the internal order.

The fftw spectrum is arranged [r0 r1 r2 ... rn-1 in in-1 ... i1], while the interal order is [r0 – r1 i1 r2 i2 ... rn-1 in-1 rn –].

sort_spec2fftw()

void MHASignal::fft_t::sort_spec2fftw ( fftw_real *  s_fftw, const mha_spec_t *  s_spec, unsigned int  ch  )

private

Arrange the order of an internal spectrum to the fftw order.

Member Data Documentation

nfft

unsigned int MHASignal::fft_t::nfft

private

n_re

unsigned int MHASignal::fft_t::n_re

private

n_im

unsigned int MHASignal::fft_t::n_im

private

scale

mha_real_t MHASignal::fft_t::scale

private

buf_in

mha_real_t* MHASignal::fft_t::buf_in

private

buf_out

mha_real_t* MHASignal::fft_t::buf_out

private

fftw_plan_wave2spec

rfftw_plan MHASignal::fft_t::fftw_plan_wave2spec

private

fftw_plan_spec2wave

rfftw_plan MHASignal::fft_t::fftw_plan_spec2wave

private

fftw_plan_fft

fftw_plan MHASignal::fft_t::fftw_plan_fft

private

fftw_plan_ifft

fftw_plan MHASignal::fft_t::fftw_plan_ifft

private

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

• mha_signal_fft.h
• mha_signal.cpp