APPARATUS, METHOD AND COMPUTER PROGRAMME FOR GENERATING BROADBAND SIGNAL USING CONTROLLED BANDWIDTH EXPANSION AND BLIND BANDWIDTH EXPANSION Russian patent published in 2014 - IPC G10L21/02 

FIELD: physics, computer engineering.

SUBSTANCE: invention relates to means of generating a broadband signal using a low-bandwidth input signal. A processor performs controlled bandwidth expansion using a low-bandwidth input signal and a first set of parameters for generating first frequency content, which continues up to the a first frequency, and performs blind bandwidth expansion using the first frequency content and a second set of parameters for generating second frequency content, which continues up to a second frequency which is higher than the first frequency. The first set of parameters and the input low-bandwidth signal are extracted from the bit stream. The processor comprises a parameter generator for generating the second set of parameters from the first frequency content, wherein the parameter generator is configured to obtain spectral envelope parameters for the second set of parameters for the second frequency content via extrapolation from lower to higher frequencies of information about the energy of the formed spectral envelope of the first frequency content.

EFFECT: wider bandwidth with low bit rate and maintaining high signal quality.

13 cl, 7 dwg