Patent ID: 8503684

Claim:
A multi-channel audio signal decoding method, applied to a playback system, comprising: receiving a first multi-channel audio signal; performing a first decoding procedure on the first multi-channel audio signal to generate a second multi-channel audio signal, wherein the first decoding procedure is performed by an AAC decoder, and the second multi-channel audio signal is a six-channel pulse code modulation (PCM) signal; performing a second decoding procedure on a first single-channel audio data of the second multi-channel audio signal to generate a first single-channel audio signal; and performing a third decoding procedure on a second single-channel audio data of the second multi-channel audio signal to generate a second single-channel audio signal, wherein a number of instructions of the third decoding procedure is less than that of the second decoding procedure; wherein the third decoding procedure comprises: producing an upsampling signal by adding a plurality of zero values between sampling points of the second single-channel audio data; and performing a low-pass filtering on the upsampling signal to generate the second single-channel audio signal.