DECODING DEVICE, ENCODING DEVICE, DECODING METHOD AND ENCODING METHOD Russian patent published in 2018 - IPC G10L19/28 G10L21/38 G10L19/26 

FIELD: cryptography.

SUBSTANCE: invention relates to means for encoding and decoding audio signals. Separate the first encoded data, where the spectrum was encoded, including the spectrum of the lower range of audio signals, and second encoded data, where the upper-range spectrum was encoded, based on the first encoded data. First encoded data is decoded and the first decoded spectrum is generated. Amplitude of the first decoded spectrum is divided into a plurality of subbands, normalize the spectrum of each subband with the largest value of the amplitude of the first decoded spectrum within each subband and generate a normalized spectrum. Add a noise spectrum to the normalized spectrum and generate a normalized spectrum with added noise. Second encoded data is decoded using a normalized noise-added spectrum and a second noise-added spectrum is generated.

EFFECT: improved quality of the coded audio signal.

22 cl, 19 dwg