Patent ID: 8532314

Claim:
An audio volume control circuit, for generating an adjustment gain value for adjusting a plurality of audio channel data of a plurality of audio channels, the circuit comprising: a signal intensity calculating circuit, for receiving the audio channel data to generate a first signal intensity value of signal intensity for the audio channel data; a low-pass filter, for low-pass filtering the first signal intensity value to generate a second signal intensity value; a weight averaging unit, for receiving the second signal intensity value, and averaging the second signal intensity value and previous M−1 second signal intensity values associated with previous M−1 time points to obtain a third signal intensity value, where M is a natural number greater than 1; a gain calculating circuit, for obtaining an original gain value according to the third signal intensity value with reference to an adjustment condition; a buffer, for temporarily storing the audio channel data; and an audio volume adjusting circuit, for generating the adjustment gain value according to the original gain value, and adjusting the audio channel data according to the adjustment gain value, comprises: a convergence calculating unit, for receiving the original gain value, and calculating the adjustment gain value according to a previous original gain value, the original gain value, and a convergence parameter; and a gain variation rate detecting unit, for receiving the original gain value, and determining whether a variation of the original gain value is increasing or decreasing according to a relationship between the original gain value and the previous original gain value, so as to correspondingly use an increasing convergence parameter or a decreasing convergence parameter as the convergence parameter.