IMPROVED FREQUENCY RANGE EXTENSION IN SOUND SIGNAL DECODER Russian patent published in 2021 - IPC G10L21/38 

FIELD: computer technology.

SUBSTANCE: invention relates to the field of computer technology for the processing of audio data. A signal is received, decoded in the first frequency range called the lower range; the decoded signal of the lower range is extended on at least one second frequency range, which is higher than the first frequency range, wherein the decoded signal of the lower range forms an extended decoded signal of the lower range; tonal components and an environment signal are extracted from a signal occurred from the decoded signal of the lower range; tonal components and the environment signal are combined by means of the adaptive mixing using coefficients of energy level control to obtain a sound signal called a combined signal; the emphasis filtration and the bandpass filtration of a frequency response are used.

EFFECT: increase in the accuracy of decoding of the sound frequency signal.

11 cl, 6 dwg