DECODING OF AUDIO BIT STREAMS WITH METADATA OF EXTENDED COPYING OF SPECTRAL BAND IN AT LEAST ONE FILLING ELEMENT Russian patent published in 2021 - IPC G10L19/35 G10L19/24 G10L21/38 

FIELD: audio encoding/decoding.

SUBSTANCE: invention relates to means for encoding and decoding audio with metadata of extended copying of a spectral band. An encoded audio bitstream is received. The encoded audio bitstream is demultiplexed. The encoded audio bitstream is decoded, wherein the encoded audio bitstream is segmented into blocks. At least one mentioned block includes a filling element with an identifier indicating the beginning of the filling element, and filling data after the identifier. Filling data includes at least one flag identifying, whether a basic form of spectral band copying or an extended form of spectral band copying should be performed for the audio content of at least one block of the encoded audio bitstream. The basic form of spectral band copying includes spectral insertion. The extended form of spectral band copying includes harmonic transposition.

EFFECT: increase in the efficiency of encoding and decoding audio.

14 cl, 3 tbl, 7 dwg