Patent ID: 8620008

Claim:
A method for processing an audio signal, comprising: receiving a downmix signal comprising at least one normal object signal, and a bitstream including object information determined when the downmix signal is generated; extracting an extension type identifier indicating whether the downmix signal further comprises a multi-channel object signal, from an extension part of the bitstream; extracting first spatial information from the bitstream when the extension type identifier indicates that the downmix signal further comprises the multi-channel object signal; generating second spatial information using the object information and mix information when mode information indicates that the multi-channel object signal is to be suppressed; and transmitting one of the first spatial information and the second spatial information, wherein the first spatial information is determined when a multi-channel source signal is downmixed into the multi-channel object signal, wherein the second spatial information is generated using the object information and mix information, and wherein the mix information is to control an object position or object level of the normal object signal.