CODING OF SPECTRAL COEFFICIENTS OF AUDIO SIGNAL SPECTRUM Russian patent published in 2017 - IPC G10L19/00 H03M7/30 

FIELD: physics.

SUBSTANCE: in this device, the adjustment of the relative spectral distance between the pre-encoded/decoded spectral coefficient and the currently-encoded spectral coefficient depends on information regarding the spectrum shape. Information regarding the spectrum shape may contain a measure of the pitch or periodicity of the audio signal, the measure of inter-harmonic distance spectrum of the audio signal and/or the relative location of the formant and/or troughs of the spectral envelope of the spectrum, and based on this knowledge, the spectral neighbourhood, which is used in order to form the context of spectral coefficients to be coded/decoded in a given time, can be adapted to the particular form of the spectrum.

EFFECT: increasing the efficiency of coding the spectral coefficients of the audio signal by encoding, decoding the spectral coefficient to be encoded, decoding at a given time, by entropy encoding, decoding.

22 cl, 22 dwg