SPEECH-AUDIO ENCODING DEVICE, SPEECH-AUDIO DECODING DEVICE, SPEECH-AUDIO ENCODING METHOD AND SPEECH-AUDIO DECODING METHOD Russian patent published in 2019 - IPC G10L19/32 

FIELD: data processing.

SUBSTANCE: invention relates to audio encoding and decoding devices. Time-domain speech input signal is transformed into a frequency-domain spectrum. Frequency band of the spectrum is divided into a wider band into a plurality of bands. Limited band is set for a respective divided band, when a difference between a first frequency with a first maximum amplitude in a spectrum of the divided band in a preceding frame and a second frequency with a second maximum amplitude in the spectrum of the divided band in the current frame below a certain threshold value, width of the limited band in the current frame already obtained by dividing the band and the limited band includes said first frequency.

EFFECT: technical result consists in reducing the number of encoded bits to be allocated to encode the spectrum of the extended band, along with preventing deterioration of sound quality in the extended band.

14 cl, 24 dwg