FIELD: physics.
SUBSTANCE: method includes decoding the flow of audio bytes in order to form a decoded audio signal of the low frequency band and the excitation spectrum in the low frequency band corresponding to the low frequency band. The frequency subband area is selected from the low frequency bands by using the parameter that specifies information of the energy spectral envelope of the decoded audio signal of the low frequency band. Excitation spectrum in the high frequency band is formed for high frequency band by duplicating the excitation spectrum in the frequency subband from the selected area of the frequency subband to the area of the high frequency band corresponding to the high frequency band. Using the formed excitation spectrum in the high frequency band, the audio signal of the extended high frequency band is formed by applying a spectral envelope of the high frequency band. The audio signal of the extended high frequency band is summed with the decoded audio signal of the low frequency band in order to form an output audio signal having an extended frequency band.
EFFECT: ensuring the formation of an extended frequency band in the decoder.
19 cl, 18 dwg
