The invention provides a method and a device for coding and decoding, which relate to the technical field of audio coding and are invented for reducing the flexibility of multichannel compression coding and decoding and time
delay. The coding method comprises: acquiring an
estimation audio channel segmental
signal of an
estimation audio channel
signal and an estimated audio channel segmental
signal of an estimated audio channel signal; and determining at least one segment having relevance to the segments of the estimated audio channel segmental signal in the
estimation audio channel segmentalsignal by using the estimation audio channel segmental signal and the estimated audio channel segmental signal; estimating the estimated audio channel segmental signal by using the segment having relevance in the estimation audio channel segmental signal to acquire an estimation parameter of the estimated audio channel segmental signal; coding an initial position parameter and an estimation parameter which correspond to the segment having relevance to generate an estimation parameter code
stream; and coding the estimation audio channel segmental signal to generate an estimation audio channel signal code
stream. The method and the device are mainly used in multichannel coding and decoding technology.