Patent ID: 8457956

Claim:
A method for generating an electrical reconstructed signal that comprises: receiving from an electrical communication path an encoded electrical signal comprising baseband spectral components of an audio signal, a noise blending parameter and an estimated spectral envelope, wherein the number of baseband spectral components contained in the encoded signal may vary dynamically; decoding the encoded electrical signal to obtain the baseband spectral components, the noise blending parameter, and the estimated spectral envelope; generating a noise signal comprising noise-signal spectral components in an interval of frequencies above the baseband spectral components, wherein the noise-signal spectral components are weighted in amplitude by a noise blending function that is a function of frequency and the noise blending parameter and that gives greater weight to spectral components at higher frequencies; generating a regenerated signal comprising regenerated-signal spectral components in the interval of frequencies above the baseband spectral components, wherein the regenerated-signal components are copied from at least some of the baseband spectral components and weighted in amplitude by an inverse of the noise blending function; generating noisy regenerated spectral components from a combination of the noise-signal spectral components and the regenerated-signal spectral components, wherein amplitudes of the noisy regenerated spectral components are weighted according to the estimated spectral envelope; and generating along an electrical communication path the electrical reconstructed signal from a time-domain representation of the baseband spectral components combined with the noisy regenerated spectral components.