Patent ID: 7881817
Filing Date: 2011-02-01
Classification: G10L

Abstract:
1. A method for processing an audio signal, comprising: receiving an audio signal including a downmix signal, and a bitstream including an ancillary signal and an extension signal, the downmix signal being generated from downmixing a multi-channel audio signal, the extension signal being included in an extension area within the ancillary signal, and the ancillary signal and the extension signal being for generating the multi-channel audio signal; acquiring extension signal type information indicating a type of the extension signal; acquiring first length information of the extension signal; acquiring second length information of the extension signal based on the first length information and first reference value; when the extension signal type information indicates that the extension signal is a residual signal, skipping decoding of the residual signal based on third length information of the extension signal; and generating the multi-channel audio signal by applying the ancillary signal to the downmix signal, wherein the first reference value is based on a bit assigned to the first length information, and wherein the third length information of the extension signal is obtained by adding the first length information to the second length information.