Patent ID: 7974421

Claim:
An audio signal processing method, comprising: controlling the volume of a digital audio signal according to a latest value of an adaptive gain value which is adjustable; detecting whether data carried by the digital audio signal satisfies a specific criterion and utilizing a pendulum counter to count a number of times the data carried by the digital audio signal satisfies the specific criterion; if the counter value of the pendulum counter reaches an upper bond, selectively decreasing the adaptive gain value according to a decrement to decrease the volume of the digital audio signal; and if the counter value of the pendulum counter reaches a lower bond, selectively increasing the adaptive gain value according to an increment to increase the volume of the digital audio signal, wherein the magnitude of the decrement and the magnitude of the increment are different from each other; wherein the step of detecting whether the data carried by the digital audio signal satisfies the specific criterion further comprises: detecting whether the ratio of a first data amount to a second data amount reaches a predetermined ratio, wherein the second data amount is an amount of data carried by the digital audio signal during a specific time interval, and the first data amount is an amount of data whose volume exceeds a predetermined threshold during the specific time interval.