sp::IIR_filt< T1, T2, T3 > Class Template Reference

#include <filter.h>

Collaboration diagram for sp::IIR_filt< T1, T2, T3 >:

Public Member Functions
	IIR_filt ()
	~IIR_filt ()
void	clear (void)
void	set_coeffs (const arma::Col< T2 > &_b, const arma::Col< T2 > &_a)
void	update_coeffs (const arma::Col< T2 > &_b, const arma::Col< T2 > &_a)
T3	operator() (const T1 &in)
arma::Col< T3 >	filter (const arma::Col< T1 > &in)

Private Attributes
arma::uword	M
arma::uword	N
arma::uword	b_cur_p
arma::uword	a_cur_p
arma::Col< T2 >	b
arma::Col< T2 >	a
arma::Col< T1 >	b_buf
arma::Col< T1 >	a_buf

Detailed Description

template<class T1, class T2, class T3>
class sp::IIR_filt< T1, T2, T3 >

Implements IIR/ARMA filter functions as

\[ a_0y(n) = b_0x(n)+b_1x(n-1)+...+b_{M-1}x(n-(M-1))-a_1y(n-1)-...-a_{M-1}y(n-(M-1))\]

where M is the number of taps in the FIR filter part and M is the number of taps in the IIR filter. The filter order is (M-1,M-1)

Examples:

fir_iir.cpp.

Definition at line 477 of file filter.h.

Constructor & Destructor Documentation

IIR_filt()

template<class T1, class T2, class T3>

sp::IIR_filt< T1, T2, T3 >::IIR_filt ( )

inline

Constructor.

Definition at line 492 of file filter.h.

~IIR_filt()

template<class T1, class T2, class T3>

sp::IIR_filt< T1, T2, T3 >::~IIR_filt ( )

inline

Destructor.

Definition at line 497 of file filter.h.

Member Function Documentation

clear()

template<class T1, class T2, class T3>

void sp::IIR_filt< T1, T2, T3 >::clear ( void  )

inline

Clears the internal states and pointers.

Definition at line 502 of file filter.h.

filter()

template<class T1, class T2, class T3>

arma::Col<T3> sp::IIR_filt< T1, T2, T3 >::filter ( const arma::Col< T1 > &  in )

inline

Filter function.

Returns

Filtered output

Parameters

in	Input vector

Definition at line 585 of file filter.h.

Referenced by main().

operator()()

template<class T1, class T2, class T3>

T3 sp::IIR_filt< T1, T2, T3 >::operator() ( const T1 &  in )

inline

Filter operator.

Returns

Filtered output

Parameters

in	Input sample

Definition at line 544 of file filter.h.

References sp::FIR_filt< T1, T2, T3 >::M.

set_coeffs()

template<class T1, class T2, class T3>

void sp::IIR_filt< T1, T2, T3 >::set_coeffs ( const arma::Col< T2 > &  _b, const arma::Col< T2 > &  _a  )

inline

Sets coefficients in IIR filter. The internal state and pointers are cleared.

Parameters

_b	Filter coefficients \( [b_0 ..b_M] \)
_a	Filter coefficients \( [a_0 ..a_N] \)

Definition at line 516 of file filter.h.

References sp::FIR_filt< T1, T2, T3 >::clear().

Referenced by main().

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update_coeffs()

template<class T1, class T2, class T3>

void sp::IIR_filt< T1, T2, T3 >::update_coeffs ( const arma::Col< T2 > &  _b, const arma::Col< T2 > &  _a  )

inline

Updates coefficients in filter without clearing the internal states.

Parameters

_b	Filter coefficients \( [b_0 ..b_M] \)
_a	Filter coefficients \( [a_0 ..a_N] \)

Definition at line 533 of file filter.h.

Member Data Documentation

a

template<class T1, class T2, class T3>

arma::Col<T2> sp::IIR_filt< T1, T2, T3 >::a

private

AR Filter coefficients.

Definition at line 485 of file filter.h.

a_buf

template<class T1, class T2, class T3>

arma::Col<T1> sp::IIR_filt< T1, T2, T3 >::a_buf

private

AR Signal buffer.

Definition at line 487 of file filter.h.

a_cur_p

template<class T1, class T2, class T3>

arma::uword sp::IIR_filt< T1, T2, T3 >::a_cur_p

private

Pointer to current sample in AR buffer.

Definition at line 483 of file filter.h.

b

template<class T1, class T2, class T3>

arma::Col<T2> sp::IIR_filt< T1, T2, T3 >::b

private

MA Filter coefficients.

Definition at line 484 of file filter.h.

b_buf

template<class T1, class T2, class T3>

arma::Col<T1> sp::IIR_filt< T1, T2, T3 >::b_buf

private

MA Signal buffer.

Definition at line 486 of file filter.h.

b_cur_p

template<class T1, class T2, class T3>

arma::uword sp::IIR_filt< T1, T2, T3 >::b_cur_p

private

Pointer to current sample in MA buffer.

Definition at line 482 of file filter.h.

M

template<class T1, class T2, class T3>

arma::uword sp::IIR_filt< T1, T2, T3 >::M

private

Nr of MA filter taps.

Definition at line 480 of file filter.h.

N

template<class T1, class T2, class T3>

arma::uword sp::IIR_filt< T1, T2, T3 >::N

private

Nr of AR filter taps.

Definition at line 481 of file filter.h.

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

• filter.h