Patent ID: 8626515
Filing Date: 2014-01-07
Classification: G10L,H04S

Abstract:
1. A method of decoding an audio signal, comprising: extracting a downmix signal from a bitstream by a downmix signal extracting unit, wherein the bitstream includes first spatial information and second spatial information; extracting at least one of the first spatial information and the second spatial information from the bitstream by a spatial information extracting unit, wherein the first spatial information is information for generating a multi-channel audio signal having at least three channels and wherein the second spatial information is information for generating a stereo audio signal having two channels, wherein the first spatial information includes parameters of channel level differences (CLD), interchannel correlations (ICC), channel prediction coefficients (CPC), and wherein the second spatial information includes parameters of interchannel intensity differences (IID), interchannel phase difference (IPD) and ICC; and generating at least one of the multi-channel audio signal and the stereo audio signal using the extracted downmix signal and one of the first and second spatial information by a channel generating unit, wherein when the multi-channel audio signal is generated, the downmix signal is upmixed using the first spatial information and the second spatial information is ignored, wherein when the stereo audio signal is generated, the downmix signal is upmixed using the second spatial information and the first spatial information is ignored.