A method for processing sensing signals in a sensing system includes receiving at least one sensing signal; performing a first operation on the at least one sensing signal to determine whether the at least one sensing signal satisfies a first predetermined condition; performing a second operation on the at least one sensing signal after a second predetermined condition is determined to be satisfied, wherein the second predetermined condition comprises a condition that the first predetermined condition is determined to be satisfied, wherein the second operation provides more sensing information than the first operation; and not performing the second operation on the at least one sensing signal after a third predetermined condition is determined to be satisfied, wherein the third predetermined condition comprises a condition that the first predetermined condition is determined to be unsatisfied.