Patent ID: 8139773

Claim:
A method for processing an audio signal, comprising: receiving a downmix signal comprising at least one object signal, and a bitstream including object information and downmix channel level difference; when the downmix signal comprises at least two object signals, extracting a relation identifier from the bitstream, the relation identifier indicating whether two object signals among the at least two object signals are related to each other; identifying whether the two object signals correspond to stereo object signals, using the downmix channel level difference and the relation identifier; generating mix information including a first element and a second element using a single user input; and generating at least one of downmix processing information and multi-channel information based on the object information and the mix information, wherein: the stereo object signals include a left object signal and a right object signal, the first element is applied to the left object signal of the stereo object signals to output a first channel, the second element is applied to the right object signal of the stereo object signals to output a second channel, and the first element is conversely related to the second element.