BiQuadDF1< T > Class Template Reference

Second-order IIR filter in Direct Form I. Maintains separate input and output histories (x and y delay lines). Requires more memory than DF2 but is less susceptible to quantization issues with fixed-point arithmetic. More...

#include <Filter.h>

Inheritance diagram for BiQuadDF1< T >:

Public Member Functions
	BiQuadDF1 (const T(&b)[3], const T(&a)[2])
	BiQuadDF1 (const T(&b)[3], const T(&a)[2], T gain)
	BiQuadDF1 (const T(&b)[3], const T(&a)[3])
	BiQuadDF1 (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
	BiQuadDF1 ()=default

Protected Attributes
T	a_1 = 0
T	a_2 = 0
T	b_0 = 0
T	b_1 = 0
T	b_2 = 0
T	x_0 = 0
T	x_1 = 0
T	y_1 = 0
T	y_2 = 0

Detailed Description

template<typename T = float>
class audio_tools::BiQuadDF1< T >

Second-order IIR filter in Direct Form I. Maintains separate input and output histories (x and y delay lines). Requires more memory than DF2 but is less susceptible to quantization issues with fixed-point arithmetic.

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

BiQuadDF1() [1/5]

template<typename T = float>

BiQuadDF1 ( const T(&)  b[3], const T(&)  a[3]  )

inline

BiQuadDF1() [2/5]

template<typename T = float>

BiQuadDF1 ( const T(&)  b[3], const T(&)  a[2]  )

inline

BiQuadDF1() [3/5]

template<typename T = float>

BiQuadDF1 ( const T(&)  b[3], const T(&)  a[2], T  gain  )

inline

BiQuadDF1() [4/5]

template<typename T = float>

BiQuadDF1 ( const T(&)  b[3], const T(&)  a[3], T  gain  )

inline

BiQuadDF1() [5/5]

template<typename T = float>

BiQuadDF1 ( )

protecteddefault

Member Function Documentation

process()

template<typename T = float>

T process ( T  in )

inlineoverridevirtual

Processes the input value and returns the filtered output value.

Implements Filter< T >.

reset()

template<typename T = float>

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 = float>

T a_1 = 0

protected

a_2

template<typename T = float>

T a_2 = 0

protected

b_0

template<typename T = float>

T b_0 = 0

protected

b_1

template<typename T = float>

T b_1 = 0

protected

b_2

template<typename T = float>

T b_2 = 0

protected

x_0

template<typename T = float>

T x_0 = 0

protected

x_1

template<typename T = float>

T x_1 = 0

protected

y_1

template<typename T = float>

T y_1 = 0

protected

y_2

template<typename T = float>

T y_2 = 0

protected

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

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