Patent ID: 8335324

Claim:
An apparatus capable of automatic volume adjustment, comprising: a speaker, broadcasting a first audio signal; an array microphone, located in the vicinity of the speaker, converting a sound into a plurality of second audio signals; a beamforming module, deriving a speaker sound signal and an ambient noise signal from the second audio signals, wherein the speaker sound signal mainly comprises speaker sound components generated by the speaker and the ambient noise signal mainly comprises noises other than the speaker sound components; a signal-to-noise ratio calculation module, calculating a ratio of a first power of the speaker sound signal to a second power of the ambient noise signal to obtain a signal-to-noise ratio; and a volume adjustment module, before the first audio signal is delivered to the speaker, increasing a volume of the first audio signal when the signal-to-noise ratio is less than a threshold level, and decreasing the volume of the first audio signal when the signal-to-noise ratio is greater than the threshold level.