Apparatus and method for processing multi-channel audio signal

An audio processing method, comprising:

• obtaining, from a bitstream, a second audio signal down-mixed from at least one first audio signal;
• obtaining, from the bitstream, first information related to error removal for the at least one first audio signal;
• de-mixing the at least one first audio signal from the down-mixed second audio signal;
• and
• reconstructing the at least one first audio signal by mixing the first information related to the error removal for the at least one first audio signal to the de-mixed at least one first audio signal,
• wherein the first information related to the error removal for the at least one first audio signal has been generated using at least one of an original signal power of the at least one first audio signal or a second signal power of the at least one first audio signal after decoding.

An audio processing apparatus, comprising:

• a memory storing one or more instructions;
• and
• at least one processor communicatively coupled to the memory, and configured to execute the one or more instructions to:
• obtain, from a bitstream, a second audio signal down-mixed from at least one first audio signal,
• obtain, from the bitstream, information related to error removal for the at least one first audio signal,
• de-mix the at least one first audio signal from the down-mixed second audio signal, and
• reconstruct the at least one first audio signal by applying the information related to the error removal for the at least one first audio signal to the at least one first audio signal de-mixed from the second audio signal, and
• wherein the information related to the error removal for the at least one first audio signal has been generated using at least one of an original signal power of the at least one first audio signal or a second signal power of the at least one first audio signal after decoding.