Patent ID: 8670576

Claim:
A method of processing an audio signal, comprising: receiving a downmix signal including at least one object signal, and object information extracted when the downmix signal is generated, the at least one object signal including a background object and at least one independent object; receiving mix information including mode selection information, the mix information for controlling the at least one object signal; receiving enhanced object information corresponding to a residual signal generated when the at least one object signal is downmixed to the downmix signal; when the mode selection information indicates a normal mode: bypassing the downmix signal without controlling the at least one object signal, generating multi-channel information using the object information and the mix information, and generating a multi-channel output signal by applying the multi-channel information to the downmix signal; and when the mode selection information indicates a mode for controlling the background object or a mode for controlling the at least one independent object: extracting the background object and the at least one independent object from the downmix signal, by using the enhanced object information, and rendering one of the background object and the at least one independent object based on the mix information, wherein the downmix signal corresponds to a mono signal.