ff01_filter< T > Class Template Reference

#include <filters.h>

Inheritance diagram for ff01_filter< T >:

Collaboration diagram for ff01_filter< T >:

Public Member Functions
	ff01_filter (float t_s, float w_c)
virtual	~ff01_filter (void)
virtual void	input (T input_value)
virtual T	output (void)
virtual void	clear (void)
Public Member Functions inherited from filter< T >
	filter (void)
virtual	~filter (void)

Private Attributes
T	Lpf_in_prev [2]
T	Lpf_out_prev [2]
T	Lpf_in1
T	Lpf_in2
T	Lpf_in3
T	Lpf_out1
T	Lpf_out2
T	lpf_out

Detailed Description

template<typename T>
class ff01_filter< T >

Definition at line 81 of file filters.h.

Constructor & Destructor Documentation

template<typename T >

ff01_filter< T >::ff01_filter	(	float	t_s,
		float	w_c
	)

Definition at line 217 of file filters.cpp.

                                                {
  Lpf_in_prev[0] = Lpf_in_prev[1] = 0;
  Lpf_out_prev[0] = Lpf_out_prev[1] = 0;
  Lpf_in1 = 0, Lpf_in2 = 0, Lpf_in3 = 0, Lpf_out1 = 0, Lpf_out2 = 0;
  T a = 1.4142;
  T den = 4 + 2 * a * w_c * t_s + t_s * t_s * w_c * w_c;
  T J = 0.00008;
  T B = 0.0002;

  Lpf_in1 = B * t_s * t_s * w_c * w_c + 2 * J * t_s * w_c * w_c;
  Lpf_in2 = 2 * B * t_s * t_s * w_c * w_c;
  Lpf_in3 = B * t_s * t_s * w_c * w_c - 2 * J * t_s * w_c * w_c;
  Lpf_out1 = -1. * (-8 + t_s * t_s * w_c * w_c * 2) / den;
  Lpf_out2 = -1. * (4 - 2 * a * w_c * t_s + t_s * t_s * w_c * w_c) / den;
}

template<typename T >

ff01_filter< T >::~ff01_filter ( void  )

virtual

Definition at line 234 of file filters.cpp.

{}

Member Function Documentation

template<typename T >

void ff01_filter< T >::clear ( void  )

virtual

Implements filter< T >.

Definition at line 254 of file filters.cpp.

                               {
  Lpf_in_prev[1] = 0;
  Lpf_in_prev[0] = 0;
  Lpf_out_prev[1] = 0;
  Lpf_out_prev[0] = 0;
}

template<typename T >

void ff01_filter< T >::input ( T  input_value )

virtual

Implements filter< T >.

Definition at line 237 of file filters.cpp.

                                   {
  lpf_out = Lpf_in1 * lpf_in + Lpf_in2 * Lpf_in_prev[0] +
            Lpf_in3 * Lpf_in_prev[1] +  // input component
            Lpf_out1 * Lpf_out_prev[0] +
            Lpf_out2 * Lpf_out_prev[1];  // output component
  Lpf_in_prev[1] = Lpf_in_prev[0];
  Lpf_in_prev[0] = lpf_in;
  Lpf_out_prev[1] = Lpf_out_prev[0];
  Lpf_out_prev[0] = lpf_out;
}

template<typename T >

T ff01_filter< T >::output ( void  )

virtual

Implements filter< T >.

Definition at line 249 of file filters.cpp.

                             {
  return lpf_out;
}

Member Data Documentation

template<typename T >

T ff01_filter< T >::Lpf_in1

private

Definition at line 92 of file filters.h.

template<typename T >

T ff01_filter< T >::Lpf_in2

private

Definition at line 92 of file filters.h.

template<typename T >

T ff01_filter< T >::Lpf_in3

private

Definition at line 92 of file filters.h.

template<typename T >

T ff01_filter< T >::Lpf_in_prev[2]

private

Definition at line 90 of file filters.h.

template<typename T >

T ff01_filter< T >::lpf_out

private

Definition at line 93 of file filters.h.

template<typename T >

T ff01_filter< T >::Lpf_out1

private

Definition at line 92 of file filters.h.

template<typename T >

T ff01_filter< T >::Lpf_out2

private

Definition at line 92 of file filters.h.

template<typename T >

T ff01_filter< T >::Lpf_out_prev[2]

private

Definition at line 91 of file filters.h.

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

• filters.h
• filters.cpp