Patent ID: 7986788

Claim:
A method of decoding an audio signal, comprising: receiving a downmix signal including at least one object signal, object information determined when the downmix signal is generated, and mix information for controlling the at least one object signal; generating downmix processing information using the object information and the mix information; processing the downmix signal using the downmix processing information in a 2×2 module, when the downmix signal corresponds to a stereo signal; generating multi-channel information using the object information and the mix information; and generating a multi-channel signal using the processed downmix signal and the multi-channel information, wherein: a number of channels of the downmix signal is equal to a number of channels of the processed downmix signal; the object information includes at least one of object level information and object correlation information; and the multi-channel information includes at least one of channel level information and channel correlation information.