FIELD: radio engineering, communication.
SUBSTANCE: invention relates to data transmission and is intended for encoding and decoding data. A bandpass filter splits an input signal into multiple-subband signals; a parameter calculating means calculates a parameter value using a selected multiple-subband signal and/or the input signal; a high-frequency subband power estimating means calculates a high-frequency subband power estimate based on the calculated parameter value; a high-frequency signal component generating means generates a high-frequency signal component based on multiple-subband signals selected by the bandpass filter, and the high-frequency subband power estimate calculated by high-frequency subband power estimating means. A frequency band extension apparatus extends the frequency band of the input signal using the high-frequency signal component.
EFFECT: high accuracy of reproducing data and high quality of sound owing to frequency band extension.
36 cl, 30 dwg
