TIME-VARIABLE POSITIONING OF TIME-FREQUENCY TILES USING NON-UNIFORM ORTHOGONAL FILTER BANKS BASED ON MDCT ANALYSIS/SYNTHESIS AND TDAR Russian patent published in 2023 - IPC G10L19/02 

FIELD: computer technology for processing audio data.

SUBSTANCE: effect is achieved by performing a cascaded overlapping critically sampled transform for at least two partially overlapping blocks of audio signal samples in order to obtain sets of subband samples based on the first block of audio signal samples and obtain sets of subband samples based on the second block of audio signal samples; identifying, in case the subband sample sets that are based on the first block of samples, represent different regions on the time-frequency plane compared to the subband sample sets that are based on the second block of samples, one or more subband sample sets of the subband sample sets that are based on the first block of samples, and one or more subband sample sets of subband sample sets that are based on the second block of samples that in combination represent an identical region of the time-frequency plane.

EFFECT: ensuring the compactness of the impulse response of a non-uniform filter bank, even when the characteristics of the input signals change.

17 cl, 24 dwg