Apparatus and method for enhancing accuracy of sensor signal
First Claim
1. An apparatus for enhancing the accuracy of a sensor signal output from a sensor by estimating and compensating for bias, the apparatus comprising:
- a low-pass filter (LPF) operable to filter the sensor signal and output a low-frequency sensor signal;
an operation determination unit operable to determine whether the sensor is not in operation;
a bias estimating unit operable to estimate bias included in the low frequency sensor signal output from the LPF according to the output of the determination unit; and
a subtractor operable to subtract the estimated bias from the low frequency sensor signal according to the output of the operation determination unit.
1 Assignment
0 Petitions
Accused Products
Abstract
An apparatus and method for enhancing the accuracy of a sensor signal are provided. The apparatus includes: a low-pass filter (LPF) that filters the sensor signal and outputs a low-frequency sensor signal; an operation determination unit that determines whether the sensor is not in operation; a bias estimating unit that estimates bias included in the low frequency sensor signal output from the LPF according to the output of the determination unit; and a subtractor that subtracts the estimated bias from the low frequency sensor signal according to the output of the operation determination unit.
-
Citations
20 Claims
-
1. An apparatus for enhancing the accuracy of a sensor signal output from a sensor by estimating and compensating for bias, the apparatus comprising:
-
a low-pass filter (LPF) operable to filter the sensor signal and output a low-frequency sensor signal;
an operation determination unit operable to determine whether the sensor is not in operation;
a bias estimating unit operable to estimate bias included in the low frequency sensor signal output from the LPF according to the output of the determination unit; and
a subtractor operable to subtract the estimated bias from the low frequency sensor signal according to the output of the operation determination unit. - View Dependent Claims (2, 3, 4, 5)
-
-
6. An apparatus for enhancing the accuracy of a sensor signal output from a sensor by controlling a tolerance level, the apparatus comprising:
-
a low-pass filter (LPF) operable to filter the sensor signal and output a low-frequency sensor signal;
a determination unit operable to determine whether the sensor is not in operation;
a noise bias estimating unit operable to estimate bias caused by noise which is included in the low frequency sensor signal output from the low-pass filter, according to the output of the determination unit;
a tolerance level estimating unit operable to detect a level of the low frequency sensor signal that is higher than the estimated bias, according to the output of the operation determination unit, and estimate a tolerance level based on the detected level and the estimated bias; and
a signal discriminating unit operable to output the low frequency sensor signal when the low frequency signal exceeds the estimated tolerance level. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13)
-
-
14. A method for enhancing the accuracy of a sensor signal output from a sensor by estimating and compensating for a bias in the sensor signal, the method comprising:
-
(a) low-pass filtering the sensor signal and outputting a low frequency sensor signal;
(b) determining whether or not the sensor is not in operation;
(c) estimating the bias included in the low frequency sensor signal when it is determined in step (b) that the sensor is not operating; and
(d) compensating for the bias by subtracting the estimated bias from the low frequency sensor signal. - View Dependent Claims (15, 16)
-
-
17. A method for enhancing the accuracy of a sensor signal output from a sensor by controlling a tolerance level, the method comprising:
-
(a) low-pass filtering the sensor signal and outputting a low frequency sensor signal;
(b) determining whether or not the sensor is not in operation;
(c) estimating a bias due to noise included in the low frequency sensor signal when it is determined in step (b) that the sensor is not operating;
(d) detecting a level of the low frequency sensor signal that is higher than the estimated noise bias, and estimating the tolerance level using the sensed level and the noise bias, when it is determined in step (b) that the sensor is not operating; and
(e) outputting the low frequency sensor signal when the filtered sensor signal has a higher level than the tolerance level estimated in step (d). - View Dependent Claims (18, 19, 20)
-
Specification