Patent ID: 8207938

Claim:
A signal filtering method provided for filtering a plurality of signals obtained by an electronic device at a plurality of time points, wherein each of the signals obtained at an i-th time point of the above time points corresponds to an i-th value, the i-th value and an (i+1)-th value are defined as an i-th ordering sequence, i is a positive integer, each of the i-th ordering sequence and an (i+1)-th ordering sequence conforms to a first strict monotonicity, and the method comprises: (a) determining whether an (i+2)-th ordering sequence conforms to a second strict monotonicity, and executing step (b) if the (i+2)-th ordering sequence conforms to the second strict monotonicity; and (b) determining whether an (i+3)-th ordering sequence conforms to the second strict monotonicity, and deleting a signal obtained at an (i+3)-th time point if the (i+3)-th ordering sequence does not conform to the second strict monotonicity.