METHOD AND SYSTEM USING THE DIFFERENCE OF LONG-TERM CORRELATIONS BETWEEN THE LEFT AND RIGHT CHANNELS FOR DOWNMIXING IN THE TIME DOMAIN OF A STEREOPHONIC AUDIO SIGNAL INTO A PRIMARY CHANNEL AND A SECONDARY CHANNEL Russian patent published in 2021 - IPC G10L19/08 H04S1/00 

FIELD: acoustics.

SUBSTANCE: group of inventions relates to encoding of stereophonic sound, in particular, to encoding of stereophonic speech and/or audio, capable of creating good stereophonic quality in a complex audio scene at a low bit rate and low latency. In the claimed method for encoding a stereophonic audio signal for downmixing in the time domain of the right and left channels of the input stereophonic audio signal into a primary channel and a secondary channel, the normalised correlations of the left channel and the right channel relative to the monophonic version of the audio signal are determined. The differences of long-term correlations are determined based on the normalised correlation of the left channel and the normalised correlation of the right channel. The difference in long-term correlations is converted into a β coefficient. The left and right channels are mixed to form the primary and secondary channels using the β coefficient, wherein the β coefficient determines the corresponding contributions of the left and right channels to the formation of the primary and secondary channels.

EFFECT: significant improvement in the quality and intelligibility of stereophonic speech for complex audio scenes at bit rates lower than the bit rates used in the dual monophonic approach.

32 cl, 18 dwg