Patent ID: 7783049

Claim:
A method for decoding an audio signal performed by an audio coding system, comprising: receiving a downmix signal in time domain; receiving object information determined when the downmix signal is generated; receiving mix information for controlling at least one object signal; when the downmix signal corresponds to a first mono signal, bypassing processing the downmix signal using downmix processing information; when a number of channels of the downmix signal corresponds to at least two, decomposing the downmix signal into a subband signal, and processing the subband signal using the downmix processing information; and generating multi-channel information using the object information and the mix information, wherein: the downmix signal comprises at least one object signal; the downmix processing information is estimated based on the object information and the mix information; the object information includes at least one of object level information and object correlation information; the multi-channel information includes at least one of a channel level difference, an inter channel correlation and a channel prediction coefficient; the downmix signal corresponds to the first mono signal or a first stereo signal and the processed downmix signal corresponds to a second mono signal or a second stereo signal; the multi-channel information is used to generate a multi-channel signal using the downmix signal; and a number of channels of the multi-channel signal is more than a number of channels of the downmix signal and a number of channels of the processed downmix signal.