System and method for determining application of adaptive filter

• US 20080152161A1
• Filed: 06/27/2007
• Published: 06/26/2008
• Est. Priority Date: 12/21/2006
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Kim, Soo Kwan, Kim, Youn Ho, Shin, Kun Soo
• Granted Patent: US 8,005,882 B2
• Time in Patent Office: Days
• US Class Current: 381/71.11
• CPC Class Codes: H03H 21/0012 Digital adaptive filters

Abstract

A system for determining application of an adaptive filter includes a signal sensor to sense a detection signal; an adaptive filter to filter the sensed signal adaptively; and a module for determining application of an adaptive filter to analyze the sensed signal and the filtered signal and to determine application of the adaptive filter to the sensed signal based on the analyzed result.

Claims

1. A system to determine application of an adaptive filter, comprising:

a signal sensing part to sense a detection signal;

an adaptive filter to filter the sensed signal adaptively; and

a module for determining application of an adaptive filter to analyze the sensed signal and the filtered signal and to determine application of the adaptive filter to the sensed signal based on the analyzed result.

2. The system of claim 1, further comprising:

a preprocessor to amplify an output of the sensed signal.

3. The system of claim 1, wherein the module to determine application of an adaptive filter receives an output value Y(n) of the adaptive filter, original data D(n) input to the adaptive filter, and coefficients W1 through Wn of reference input values X1(n) through Xn(n) of the adaptive filter, obtains absolute values Abs[Y(n)] and Abs [D(n)] of the output value Y(n) and the original data D(n) to apply a low pass filter (LPF) having low pass cutoff, and obtains an output ratio R(n)=Y(n)′

/D(n)′

of moving average values Y(n)′ and

D(n)′

to determine whether to perform adaptive filtering of the adaptive filter based on the output ratio R(n).

4. The system of claim 3, wherein the module to determine application of an adaptive filter determines that adaptive filtering is performed by the adaptive filter when the output ratio R(n) is greater than or equal to a first threshold value.

5. The system of claim 4, wherein the module to determine application of an adaptive filter determines that adaptive filtering is performed by the adaptive filter when the output ratio R(n) is smaller than the first threshold value, and NW or ACC ratio is less than a second threshold value.

6. The system of claim 5, wherein the module to determine application of an adaptive filter determines that adaptive filtering is not performed by the adaptive filter to output the original data D(n) when the NW or the ACC ratio is greater than or equal to the second threshold value.

7. The system of claim 3, wherein the module to determine application of an adaptive filter outputs either a signal Y(n), in which adaptive filtering is performed by the adaptive filter, or the original data D(n), based on the determined result of the module for determining application of an adaptive filter.

8. A method for determining application of an adaptive filter, comprising:

sensing a signal to be measured through various sensors;

performing adaptive filtering of the sensed signal through an adaptive filter; and

analyzing the sensed signal and the adaptive filtered signal and determining application of adaptive filtering to the sensed signal based on the analyzed result.

9. The method of claim 8, wherein the determining application of the adaptive filtering to the sensed signal includes:

receiving an output value Y(n) of the adaptive filter, original data D(n) input to the adaptive filter, and coefficients W1 through Wn of reference input values X1(n) through Xn(n) of the adaptive filter;

respectively obtaining absolute values of the output value Y(n) and the original data D(n);

passing the absolute values through a low pass filter (LPF) having low pass cutoff;

obtaining an output ratio R(n) of the adaptive filter; and

determining application of adaptive filtering of the adaptive filter to the sensed signal based on the output ratio.

10. The method of claim 9, wherein the determining application of the adaptive filtering to the sensed signal further includes determining that the adaptive filtering is performed by the adaptive filter when the output ratio R(n) is greater than or equal to a first threshold value.

11. The method of claim 10, wherein the determining application of the adaptive filtering to the sensed signal further includes determining that the adaptive filtering is performed by the adaptive filter when the output ratio R(n) is less than the first threshold value, and NW or ACC ratio is less than a second threshold value.

12. The method of claim 11, wherein determining application of adaptive filtering to the sensed signal includes determining that adaptive filtering is not performed by the adaptive filter to output the original data D(n) when the NW or the ACC ratio is greater than or equal to the second threshold value.

13. The method of claim 9, further comprising either a signal Y(n), in which adaptive filtering is performed by the adaptive filter, or the original data D(n), based on the determined result of application of adaptive filtering.

14. The method of claim 9, further comprising:

amplifying an output of the sensed signal.

15. A computer readable recording medium recording a program to implement the method of claim 8 in a computer.