AUDIO DECODER, AUDIO ENCODER, ENCODED PRESENTATION BASED AT LEAST FOUR CHANNEL AUDIO SIGNALS PROVISION METHOD, AT LEAST FOUR CHANNEL AUDIO SIGNALS BASED ENCODED REPRESENTATION PROVISION METHOD AND USING THE RANGE EXTENSION COMPUTER SOFTWARE Russian patent published in 2018 - IPC G10L19/08 G10L21/38 

FIELD: acoustics.

SUBSTANCE: invention relates to the audio encoding and decoding devices. Using the multi-channel decoding providing the first step-down mixing signal and the second step-down mixing signal based on the first step-down mixing signal and the second step-down mixing signal jointly encoded representation. Based on the first step-down mixing signal providing the first channel audio signal and the second channel audio signal. Based on the second step-down mixing signal providing the third channel audio signal and the fourth channel audio signal. Performing the first joint multi-channel bandwidth extension based on the first channel audio signal and the third channel audio signal to produce the first channel signal with extended bandwidth and the third channel signal with extended bandwidth.

EFFECT: increase in the three-dimensional audio scenes encoding and decoding efficiency.

37 cl, 23 dwg