BiQuadDF2< T > Class Template Reference

Second-order IIR filter in Direct Form II. Uses a single delay line, requiring less memory than DF1. This is the base class for the ready-to-use filter types (LowPassFilter, HighPassFilter, BandPassFilter, NotchFilter, LowShelfFilter, HighShelfFilter) which compute their coefficients from frequency, sample rate and Q/gain parameters. More...

#include <Filter.h>

Inheritance diagram for BiQuadDF2< T >:

Public Member Functions
	BiQuadDF2 (const T(&b)[3], const T(&a)[2])
	BiQuadDF2 (const T(&b)[3], const T(&a)[2], T gain)
	BiQuadDF2 (const T(&b)[3], const T(&a)[3])
	BiQuadDF2 (const T(&b)[3], const T(&a)[3], T gain)
T	process (T value) override
	Processes the input value and returns the filtered output value.
void	reset () override

Protected Member Functions
	BiQuadDF2 ()=default

Protected Attributes
T	a_1 = 0
T	a_2 = 0
T	b_0 = 0
T	b_1 = 0
T	b_2 = 0
T	w_0 = 0
T	w_1 = 0

Detailed Description

template<typename T>
class audio_tools::BiQuadDF2< T >

Second-order IIR filter in Direct Form II. Uses a single delay line, requiring less memory than DF1. This is the base class for the ready-to-use filter types (LowPassFilter, HighPassFilter, BandPassFilter, NotchFilter, LowShelfFilter, HighShelfFilter) which compute their coefficients from frequency, sample rate and Q/gain parameters.

Author

Pieter P tttapa / pschatzmann

Copyright

GNU General Public License v3.0

Template Parameters

T	sample type (use float or double, not integer types)

Constructor & Destructor Documentation

BiQuadDF2() [1/5]

template<typename T >

BiQuadDF2 ( const T(&)  b[3], const T(&)  a[3]  )

inline

BiQuadDF2() [2/5]

template<typename T >

BiQuadDF2 ( const T(&)  b[3], const T(&)  a[2]  )

inline

BiQuadDF2() [3/5]

template<typename T >

BiQuadDF2 ( const T(&)  b[3], const T(&)  a[2], T  gain  )

inline

BiQuadDF2() [4/5]

template<typename T >

BiQuadDF2 ( const T(&)  b[3], const T(&)  a[3], T  gain  )

inline

BiQuadDF2() [5/5]

template<typename T >

BiQuadDF2 ( )

protecteddefault

Member Function Documentation

process()

template<typename T >

T process ( T  in )

inlineoverridevirtual

Processes the input value and returns the filtered output value.

Implements Filter< T >.

reset()

template<typename T >

void reset ( )

inlineoverridevirtual

Clears the internal state (delay lines) without changing the coefficients. Call after reconfiguring filter parameters via begin() to avoid transients from stale state.

Reimplemented from Filter< T >.

Member Data Documentation

a_1

template<typename T >

T a_1 = 0

protected

a_2

template<typename T >

T a_2 = 0

protected

b_0

template<typename T >

T b_0 = 0

protected

b_1

template<typename T >

T b_1 = 0

protected

b_2

template<typename T >

T b_2 = 0

protected

w_0

template<typename T >

T w_0 = 0

protected

w_1

template<typename T >

T w_1 = 0

protected

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

• src/AudioTools/CoreAudio/AudioFilter/Filter.h