Method and an apparatus for processing an audio signal

An apparatus for processing an audio signal, comprising:

• a multiplexer receiving a downmix signal, a residual signal and object information;
• an extracting unit extracting at least one of a background-object signal and a foreground-object signal from the downmix signal using the residual signal;
• an information generating unit receiving mix information comprising gain control information for the background-object signal, and generating a downmix processing information based on the object information and mix information;
• and,
• a rendering unit generating a processed downmix signal comprising a modified background-object signal to which an adjusted gain corresponding to the gain control information is applied, by applying the downmix processing information to the at least one of the background-object signal and the foreground-object signal,
• wherein, when the mix information comprises gain control information for the background-object signal, the processed downmix signal comprises a modified background-object signal to which an adjusted gain corresponding to the gain control information is applied.

A computer-readable medium having instructions stored thereon, which, when executed by a processor, causes the processor to perform operations, comprising:

• receiving a downmix signal, a residual signal and object information;
• extracting at least one of a background-object signal and a foreground-object signal from the downmix signal using the residual signal;
• generating a downmix processing information based on the object information and mix information;
• and,
• generating a processed downmix signal by applying the downmix processing information to the at least one of the background-object signal and the foreground-object signal,
• wherein, when the mix information comprises gain control information for the background-object signal, the processed downmix signal comprises a modified background-object signal to which an adjusted gain corresponding to the gain control information is applied.