Patent ID: 6255976
Filing Date: 2001-07-03
Classification: G04F,H03M

Abstract:
A low-frequency noise removing method for removing a low-frequency noise having a noise component proportional to 1/f and (1/f).sup.n, where ""f"" represents a noise frequency and n.gtoreq.1, which is applicable to a sensing circuit with an A/D conversion means for converting the signal quantity of a sensing objective signal, said method comprising the steps of:setting an intentional offset value beforehand, said intentional offset value being larger than said sensing objective signal;converting said intentional offset value into digital data by said A/D conversion means to obtain intentional offset data representing the quantity of said intentional offset value;converting a sum of said sensing objective signal and said intentional offset value into digital data by said A/D conversion means to obtain sensed signal data representing a summation of the quantity of said sensing objective signal and the quantity of said intentional offset value;obtaining a ratio of said sensed signal data to said intentional offset data; andusing said ratio as noise reducing signal data for reducing the low-frequency noise involved in a sensor output.