Patent ID: 8600532

Claim:
A method of processing an audio signal, comprising: receiving a downmix signal, object information and rendering information; generating downmix processing information using the object information and the rendering information; generating multi-channel information using the object information and the rendering information; generating a processed downmix signal using the downmix processing information and the downmix signal; and decoding a multi-channel audio signal by applying the multi-channel information to the processed downmix signal, wherein the object information includes modified object level information instead of object level information and a downmix gain, wherein the modified object level information is determined using a level of a modified object generated by applying a downmix gain to an object, and wherein the object information further includes object gain difference information indicating a ratio of contributing the modified object to a left channel and a right channel of a stereo signal, if the downmix signal is the stereo signal.