HARDWARE UNIT, METHOD AND COMPUTER PROGRAMME FOR EXPANSION CONVERSION OF COMPRESSED AUDIO SIGNAL USING SMOOTHED PHASE VALUE Russian patent published in 2015 - IPC G10L19/00 

FIELD: physics, acoustics.

SUBSTANCE: group of inventions relates to expansion of a compressed audio signal which consists of one or more compressed audio channels into an expanded audio signal. An expansion unit is set up to use current variable expansion parameters to expand a compressed audio signal in order to obtain an expanded audio signal, wherein current variable expansion parameters comprise current variables of smoothed phase values. A parameter determiner is set up to obtain one or more current smoothed expansion parameters for use in the expansion unit based on input information on sampled expansion parameters. The parameter determiner is set up to combine a scaled version of the previous smoothed phase value and a scaled version of input phase information, using a phase change limiting algorithm to determine the current smoothed phase value based on the previous smoothed value and input phase information.

EFFECT: high quality of the expanded audio signal.

13 cl, 7 dwg