AUDIO ENCODING/DECODING METHOD AND LATTICE-TYPE VECTOR QUANTISING SYSTEM Russian patent published in 2014 - IPC H03M7/30 

FIELD: physics, acoustics.

SUBSTANCE: invention relates to audio encoding/decoding techniques and particularly to a method of encoding/decoding audio and a lattice-type vector quantising system. The method involves: dividing frequency domain coefficients of an audio signal for which a modified discrete cosine transform (MDCT) has been performed into a plurality of coding sub-bands, and quantising and coding an amplitude envelope value of each coding sub-band to obtain coded bits of amplitude envelopes; performing bit allocation on each coding sub-band, and performing normalisation, quantisation and coding respectively on vectors in a low bit coding sub-band with pyramid lattice vector quantisation and on vectors in a high bit coding sub-band with sphere lattice vector quantisation to obtain coded bits of the frequency domain coefficients; multiplexing and packing the coded bits of the amplitude envelope and the coded bits of the frequency domain coefficients of each coding sub-band, then sending them to a decoding side.

EFFECT: providing good quality of encoding a voice information source through combined lattice vector quantisation using pyramid lattice vector quantisation and sphere lattice vector quantisation.

25 cl, 7 tbl, 9 dwg