AUDIO SIGNAL ENCODER, AUDIO SIGNAL DECODER, METHOD FOR ENCODED REPRESENTATION OF AUDIO CONTENT, METHOD FOR DECODED REPRESENTATION OF AUDIO AND COMPUTER PROGRAM FOR APPLICATIONS WITH SMALL DELAY

摘要

FIELD: computer engineering.SUBSTANCE: invention relates to computer engineering. Audio signal encoder comprises a transform-domain path configured to obtain a set of spectral coefficients and noise-shaping information on the basis of a time-domain representation of a portion of the audio content to be encoded in a transform-domain mode. Transform-domain path comprises a time-domain-to-frequency-domain converter which performs window weighing in time domain of audio representation and outputs a set of spectral coefficients using time-domain-to-frequency-domain conversion window-weighted time representation of audio. Audio signal encoder includes a code-excited linear-prediction-domain path (CELP), which extracts information on code excitation and parameters of field of linear prediction of fragment audio encoded in CELP mode. Audio signal encoder allows selective formation of anti-aliasing information, when current fragment of audio follows fragment of audio coded by a CELP mode.EFFECT: technical result consists in improvement of efficiency of encoding successive fragments of audio.28 cl, 32 dwg