MHAFilter::filter_t Class Reference

Generic IIR filter class. More...

Inheritance diagram for MHAFilter::filter_t:

Public Member Functions
	filter_t (unsigned int ch, unsigned int lena, unsigned int lenb)
	Constructor. More...
	filter_t (unsigned int ch, const std::vector< mha_real_t > &vA, const std::vector< mha_real_t > &vB)
	Constructor with initialization of coefficients. More...
	filter_t (const MHAFilter::filter_t &src)
	Copy constructor. More...
filter_t &	operator= (const MHAFilter::filter_t &)=delete
	Assignment operator is not implemented. More...
	~filter_t ()
void	filter (mha_wave_t *out, const mha_wave_t *in)
	Filter all channels in a waveform structure. More...
void	filter (mha_real_t *dest, const mha_real_t *src, unsigned int dframes, unsigned int frame_dist, unsigned int channel_dist, unsigned int channel_begin, unsigned int channel_end)
	Filter parts of a waveform structure. More...
mha_real_t	filter (mha_real_t x, unsigned int ch)
	Filter one sample. More...
unsigned int	get_len_A () const
	Return length of recursive coefficients. More...
unsigned int	get_len_B () const
	Return length of non-recursive coefficients. More...

Public Attributes
double *	A
	Pointer to recursive coefficients. More...
double *	B
	Pointer to non-recursive coefficients. More...

Private Attributes
unsigned int	len_A
unsigned int	len_B
unsigned int	len
unsigned int	channels
double *	state

Detailed Description

Generic IIR filter class.

This class implements a generic multichannel IIR filter. It is realized as direct form II. It can work on any float array or on mha_wave_t structs. The filter coefficients can be directly accessed.

Constructor & Destructor Documentation

filter_t() [1/3]

MHAFilter::filter_t::filter_t	(	unsigned int	ch,
		unsigned int	lena,
		unsigned int	lenb
	)

Constructor.

Parameters

ch	Number of channels
lena	Number of recursive coefficients
lenb	Number of non-recursive coefficients

filter_t() [2/3]

MHAFilter::filter_t::filter_t	(	unsigned int	ch,
		const std::vector< mha_real_t > &	vA,
		const std::vector< mha_real_t > &	vB
	)

Constructor with initialization of coefficients.

Parameters

ch	Number of channels.
vA	Recursive coefficients.
vB	Non-recursive coefficients.

filter_t() [3/3]

MHAFilter::filter_t::filter_t

(

const MHAFilter::filter_t &

src

)

Copy constructor.

~filter_t()

MHAFilter::filter_t::~filter_t

(

)

Member Function Documentation

operator=()

filter_t& MHAFilter::filter_t::operator= ( const MHAFilter::filter_t &  )

delete

Assignment operator is not implemented.

Use copy constructor instead.

filter() [1/3]

void MHAFilter::filter_t::filter	(	mha_wave_t *	out,
		const mha_wave_t *	in
	)

Filter all channels in a waveform structure.

Parameters

out	Output signal
in	Input signal

filter() [2/3]

void MHAFilter::filter_t::filter	(	mha_real_t *	dest,
		const mha_real_t *	src,
		unsigned int	dframes,
		unsigned int	frame_dist,
		unsigned int	channel_dist,
		unsigned int	channel_begin,
		unsigned int	channel_end
	)

Filter parts of a waveform structure.

Parameters

dest	Output signal.
src	Input signal.
dframes	Number of frames to be filtered.
frame_dist	Index distance between frames of one channel
channel_dist	Index distance between audio channels
channel_begin	Number of first channel to be processed
channel_end	Number of last channel to be processed

filter() [3/3]

mha_real_t MHAFilter::filter_t::filter	(	mha_real_t	x,
		unsigned int	ch
	)

Filter one sample.

Parameters

x	Input value
ch	Channel number to use in filter state

get_len_A()

unsigned int MHAFilter::filter_t::get_len_A ( ) const

inline

Return length of recursive coefficients.

get_len_B()

unsigned int MHAFilter::filter_t::get_len_B ( ) const

inline

Return length of non-recursive coefficients.

Member Data Documentation

A

double* MHAFilter::filter_t::A

Pointer to recursive coefficients.

B

double* MHAFilter::filter_t::B

Pointer to non-recursive coefficients.

len_A

unsigned int MHAFilter::filter_t::len_A

private

len_B

unsigned int MHAFilter::filter_t::len_B

private

len

unsigned int MHAFilter::filter_t::len

private

channels

unsigned int MHAFilter::filter_t::channels

private

state

double* MHAFilter::filter_t::state

private

---

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

• mha_filter.hh
• mha_filter.cpp