Patent ID: 8498421

Claim:
A decoding method comprising: extracting, by an audio decoding apparatus, a down-mix signal and additional information from an input signal; extracting, by the audio decoding apparatus, compensation information from the additional information, the compensation information indicating whether a compensation parameter is applied to a second multi-channel audio signal; extracting, by the audio decoding apparatus, spatial information and the compensation parameter from the additional information, the compensation parameter relating an envelope of the down-mix signal to an envelope of a first multi-channel audio signal that is used to generate the down-mix signal; generating, by the audio decoding apparatus, the second multi-channel audio signal based on the down-mix signal and the spatial information; and compensating, by an audio decoding apparatus, the envelope of each channel of the second multi-channel audio signal based on the compensation parameter when the compensation information indicates the compensation parameter is applied to the second multi-channel audio signal.