Patent ID: 8855319

Claim:
An audio signal processing apparatus, comprising: a plurality of individual audio interfaces; an audio signal processing unit, for determining a total number of audio channels corresponding to the individual audio interfaces and generating a first output audio signal with a first number of audio channels according to an input audio signal and the total number of audio channels when the audio signal processing apparatus is operated under a first operational mode; and an audio channel splitting unit, coupled to the audio signal processing unit and the audio interfaces, wherein when the audio signal processing apparatus is operated under the first operational mode, the audio channel splitting unit splits the first output audio signal with the first number of audio channels to the audio interfaces, respectively, wherein the audio signal processing unit comprises: a processing module, coupled to the audio channel splitting unit, for generating the first output audio signal by processing the input audio signal according to a first control signal when the audio signal processing apparatus is operated under the first operational mode, wherein the processing module comprises: a decoding unit, for decoding the input audio signal to generate a second output audio signal with a second number of audio channels; and a specific downmixing unit, coupled to the decoding unit, for downmixing the second output audio signal to generate the first output audio signal according to the first control signal when the audio signal processing apparatus is operated under the first operational mode, wherein the first number of audio channels is different from the second number of audio channels.