Bandwidth extension of acoustic signals

摘要

A solution for improving the perceived sound quality of a decoded acoustic signal is accomplished by extending the spectrum of a received narrow-band acoustic signal (a_NB). A wide-band acoustic signal (A_WB) is produced by extracting at least one essential attribute (z_NB) from the narrow-band acoustic signal (a_NB). Parameters, e.g., representing signal energies, with respect to wide-band frequency components outside the spectrum (A_NB) of the narrow-band acoustic signal (a_NB), are estimated based on the at least one essential attribute (z_NB). This estimation involves allocating a parameter value to a wide-band frequency component, based on a corresponding confidence level.