adaptive_notch_filter.h File Reference

Adaptive notch filter. More...

#include "std.h"
#include "filters/low_pass_filter.h"
#include "filters/notch_filter_float.h"

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Data Structures
struct	AdaptiveNotchFilter

Functions
static void	adaptive_notch_filter_init (struct AdaptiveNotchFilter *filter, float sample_time, float low_freq_bound, float high_freq_bound, float bandwidth, float lambda, float a_ini, float value)
	Init a adaptive notch filter. More...
static void	adaptive_notch_filter_update (struct AdaptiveNotchFilter *filter, float value, float *output_signal)
	Update a second order adaptive notch filter. More...
static float	adaptive_notch_filter_get_output (struct AdaptiveNotchFilter *filter)
	Return the latest second order adaptive notch filter output. More...

Detailed Description

Adaptive notch filter.

Definition in file adaptive_notch_filter.h.

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Data Structure Documentation

AdaptiveNotchFilter

struct AdaptiveNotchFilter

Definition at line 35 of file adaptive_notch_filter.h.

Collaboration diagram for AdaptiveNotchFilter:

Data Fields
float	a_est
float	hp_cutoff_f
Butterworth2LowPass	hp_filter
float	lambda
float	lp_cutoff_f
Butterworth2LowPass	lp_filter
struct SecondOrderNotchFilter	output_n_filter
float	r
float	r2
float	Ts
float	xband[3]
float	y[2]
float	y_est[2]

Function Documentation

adaptive_notch_filter_get_output()

static float adaptive_notch_filter_get_output ( struct AdaptiveNotchFilter *  filter )

inlinestatic

Return the latest second order adaptive notch filter output.

Parameters

filter

adaptive notch filter structure

Returns

latest filtered value

Definition at line 138 of file adaptive_notch_filter.h.

References AdaptiveNotchFilter::y_est.

adaptive_notch_filter_init()

static void adaptive_notch_filter_init ( struct AdaptiveNotchFilter *  filter, float  sample_time, float  low_freq_bound, float  high_freq_bound, float  bandwidth, float  lambda, float  a_ini, float  value  )

inlinestatic

Init a adaptive notch filter.

Parameters

filter	adaptive notch filter structure
sample_time	sampling period of the signal
low_freq_bound	lower frequency bound of the adaptive notch filter
high_freq_bound	higher frequency bound of the adaptive notch filter
bandwidth	bandwidth of the adaptive notch filter
lambda	learning rate of the adaptive notch filter
a_ini	initial band-stop frequency of the adaptive notch filter
value	initial value of the filter

Definition at line 65 of file adaptive_notch_filter.h.

References AdaptiveNotchFilter::a_est, AdaptiveNotchFilter::hp_cutoff_f, AdaptiveNotchFilter::hp_filter, init_butterworth_2_low_pass(), AdaptiveNotchFilter::lambda, lambda, AdaptiveNotchFilter::lp_cutoff_f, AdaptiveNotchFilter::lp_filter, notch_filter_init(), AdaptiveNotchFilter::output_n_filter, AdaptiveNotchFilter::r, AdaptiveNotchFilter::Ts, AdaptiveNotchFilter::xband, AdaptiveNotchFilter::y, and AdaptiveNotchFilter::y_est.

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adaptive_notch_filter_update()

static void adaptive_notch_filter_update ( struct AdaptiveNotchFilter *  filter, float  value, float *  output_signal  )

inlinestatic

Update a second order adaptive notch filter.

Parameters

filter	adaptive notch filter structure
value	new input value of the filter
output	pointer to float for output

Returns

new filtered value

Definition at line 102 of file adaptive_notch_filter.h.

References AdaptiveNotchFilter::a_est, AdaptiveNotchFilter::hp_cutoff_f, AdaptiveNotchFilter::hp_filter, AdaptiveNotchFilter::lambda, AdaptiveNotchFilter::lp_cutoff_f, AdaptiveNotchFilter::lp_filter, notch_filter_set_filter_frequency(), notch_filter_update(), SecondOrderLowPass::o, AdaptiveNotchFilter::output_n_filter, AdaptiveNotchFilter::r, AdaptiveNotchFilter::r2, AdaptiveNotchFilter::Ts, update_butterworth_2_low_pass(), AdaptiveNotchFilter::xband, AdaptiveNotchFilter::y, and AdaptiveNotchFilter::y_est.

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