1. A multi-channel audio signal encoding method, the method comprising: obtaining semantic information for each channel of a plurality of channels of the multi-channel audio signal; determining a degree of similarity between the plurality of channels based on the obtained semantic information for each channel; determining similar channels among the plurality of channels based on the determined degree of similarity between the multi-channels; and determining spatial parameters between the similar channels and down-mixing audio signals of the similar channels using the similar channels so as to enhance a channel separation on a decoder, wherein the determining the similar channels comprises comparing the determined degree of similarity between the plurality of channels with a predetermined threshold.
1. A multi-channel audio signal encoding method, the method comprising: obtaining semantic information for each channel of a plurality of channels of the multi-channel audio signal; determining a degree of similarity between the plurality of channels based on the obtained semantic information for each channel; determining similar channels among the plurality of channels based on the determined degree of similarity between the multi-channels; and determining spatial parameters between the similar channels and down-mixing audio signals of the similar channels using the similar channels so as to enhance a channel separation on a decoder, wherein the determining the similar channels comprises comparing the determined degree of similarity between the plurality of channels with a predetermined threshold. 6. The method of claim 1 , further comprising: generating a bitstream by adding the semantic information for each channel to the down-mixed audio signals of the similar channels.