Method for encoding and decoding multi-channel audio signal and apparatus thereof

摘要

Methods and apparatuses for encoding and decoding a multi-channel audio signal are provided. In the encoding method, spatial information is calculated based on a multi-channel audio signal and a down-mix signal, and a compensation parameter that compensates for the down-mix signal is calculated based on the multi-channel audio signal and the down-mix signal. Thereafter, a bitstream is generated by encoding the spatial information, the compensation parameter, and the down-mix signal and combining the results of the encoding. Therefore, it is possible to prevent deterioration of the quality of sound regarding a multi-channel audio signal by compensating for the multi-channel audio signal using a compensation parameter that compensates for a down-mix signal.

主权项

1. A computer-readable recording medium selected from the group consisting of a non-volatile computer-readable medium, a volatile computer-readable medium, and combinations thereof, the computer-readable medium having computer-executable instructions stored thereon, which, when executed by a processor, causes the processor to perform the operations of:
receiving an audio signal through a computer system connected to a network; extracting a down-mix signal and additional information from the audio signal; extracting compensation information from the additional information, the compensation information indicating whether a compensation parameter is applied to a channel of a first multi-channel audio signal, the first multi-channel audio signal being reconstructed based on the down-mix signal and spatial information including first spatial information and second spatial information; extracting the first spatial information from the additional information, the first spatial information including information on inter-channel cross correlation (ICC); deriving the second spatial information based the extracted first spatial information and the down-mix signal, the second spatial information including at least one of channel level difference (CLD) and information on channel prediction coefficient (CPC); extracting, from the additional information, the compensation parameter relating an envelope of the down-mix signal to an envelope of each channel of a second multi-channel audio signal when the compensation information indicates that the compensation parameter is applied to the channel of the first multi-channel audio signal, the second multi-channel audio signal being used to generate the down-mix signal; reconstructing the first multi-channel audio signal based on the down-mix signal and the spatial information including the first spatial information and the second spatial information; compensating the envelope of each channel of the first multi-channel audio signal based on the compensation parameter; and transmitting the compensated first multi-channel audio signal to a device.