MHAFilter::fftfilter_t Class Reference

FFT based FIR filter implementation. More...

Inheritance diagram for MHAFilter::fftfilter_t:

Public Member Functions
	fftfilter_t (unsigned int fragsize, unsigned int channels, unsigned int fftlen)
	Constructor. More...
	~fftfilter_t ()
void	update_coeffs (const mha_wave_t *pwIRS)
	Update the set of coefficients. More...
void	filter (const mha_wave_t *pwIn, mha_wave_t **ppwOut, const mha_wave_t *pwIRS)
	Apply filter with changing coefficients to a waveform fragment. More...
void	filter (const mha_wave_t *pwIn, mha_wave_t **ppwOut)
	Apply filter to waveform fragment, without changing the coefficients. More...
void	filter (const mha_wave_t *pwIn, mha_wave_t **ppwOut, const mha_spec_t *psWeights)
	Apply filter with changing coefficients to a waveform fragment. More...

Private Attributes
unsigned int	fragsize
unsigned int	channels
unsigned int	fftlen
MHASignal::waveform_t	wInput_fft
mha_wave_t	wInput
MHASignal::waveform_t	wOutput_fft
mha_wave_t	wOutput
MHASignal::spectrum_t	sInput
MHASignal::spectrum_t	sWeights
MHASignal::waveform_t	wIRS_fft
mha_fft_t	fft

Detailed Description

FFT based FIR filter implementation.

The maximal number of coefficients can be FFT length - fragsize + 1.

Constructor & Destructor Documentation

fftfilter_t()

MHAFilter::fftfilter_t::fftfilter_t	(	unsigned int	fragsize,
		unsigned int	channels,
		unsigned int	fftlen
	)

Constructor.

Parameters

fragsize	Number of frames expected in input signal (each cycle).
channels	Number of channels expected in input signal.
fftlen	FFT length of filter.

~fftfilter_t()

MHAFilter::fftfilter_t::~fftfilter_t

(

)

Member Function Documentation

update_coeffs()

void MHAFilter::fftfilter_t::update_coeffs

(

const mha_wave_t *

pwIRS

)

Update the set of coefficients.

Parameters

pwIRS

Coefficients structure

Note

The number of channels in h must match the number of channels given in the constructor. The filter length is limited to fftlen-fragsize+1 (longer IRS will be shortened).

filter() [1/3]

void MHAFilter::fftfilter_t::filter	(	const mha_wave_t *	pwIn,
		mha_wave_t **	ppwOut,
		const mha_wave_t *	pwIRS
	)

Apply filter with changing coefficients to a waveform fragment.

Parameters

pwIn	Input signal pointer.

Return values

ppwOut

Pointer to output signal pointer, will be set to a valid signal.

Parameters

pwIRS

Pointer to FIR coefficients structure.

filter() [2/3]

void MHAFilter::fftfilter_t::filter	(	const mha_wave_t *	pwIn,
		mha_wave_t **	ppwOut
	)

Apply filter to waveform fragment, without changing the coefficients.

Parameters

pwIn	Input signal pointer.

Return values

ppwOut

Pointer to output signal pointer, will be set to a valid signal

filter() [3/3]

void MHAFilter::fftfilter_t::filter	(	const mha_wave_t *	pwIn,
		mha_wave_t **	ppwOut,
		const mha_spec_t *	psWeights
	)

Apply filter with changing coefficients to a waveform fragment.

Parameters

pwIn	Input signal pointer.

Return values

ppwOut

Pointer to output signal pointer, will be set to a valid signal.

Parameters

psWeights

Pointer to filter weights structure.

Member Data Documentation

fragsize

unsigned int MHAFilter::fftfilter_t::fragsize

private

channels

unsigned int MHAFilter::fftfilter_t::channels

private

fftlen

unsigned int MHAFilter::fftfilter_t::fftlen

private

wInput_fft

MHASignal::waveform_t MHAFilter::fftfilter_t::wInput_fft

private

wInput

mha_wave_t MHAFilter::fftfilter_t::wInput

private

wOutput_fft

MHASignal::waveform_t MHAFilter::fftfilter_t::wOutput_fft

private

wOutput

mha_wave_t MHAFilter::fftfilter_t::wOutput

private

sInput

MHASignal::spectrum_t MHAFilter::fftfilter_t::sInput

private

sWeights

MHASignal::spectrum_t MHAFilter::fftfilter_t::sWeights

private

wIRS_fft

MHASignal::waveform_t MHAFilter::fftfilter_t::wIRS_fft

private

fft

mha_fft_t MHAFilter::fftfilter_t::fft

private

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

• mha_filter.hh
• mha_filter.cpp