Patent ID: 7974287
Filing Date: 2011-07-05
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, an extension signal, and header identification information indicating whether a header is included in a data frame of the ancillary signal, the ancillary signal comprising a plurality of data frames in the bitstream, the downmix signal being generated from downmixing a multi-channel audio signal, the ancillary signal and the extension signal for generating the multi-channel audio signal, the extension signal being included in an extension area within the ancillary signal, and the extension signal is at least one of a residual signal, an artistic downmix signal or an artistic tree extension signal; acquiring length information of the extension signal from the header when the header is included in the data frame of the ancillary signal according to the header identification information; skipping decoding of the extension signal included in the extension area based on the length information; and generating the multi-channel audio signal by applying the ancillary signal to the downmix signal.