Patent ID: 8805695
Filing Date: 2014-08-12
Classification: G10L

Abstract:
1. A bandwidth expansion method, comprising: estimating a bandwidth of at least one previously decoded frame of a whole-band signal, so as to obtain an estimated bandwidth; wherein the estimated bandwidth is used as the estimated bandwidth of a current frame of a lower-band signal; performing bandwidth expansion for the lower-band signal by using different predictive decoding on the lower-band signal according to an effective bandwidth of the lower-band signal and the estimated bandwidth, comprising: performing first predictive decoding on a part of the lower-band signal in a band above an effective bandwidth of the lower-band signal and below the estimated bandwidth, so as to obtain the part of the lower-band signal above the effective bandwidth of the lower-band signal and below the estimated bandwidth; and performing second predictive decoding on a part of the lower-band signal in a band above the estimated bandwidth, so as to obtain the part of the lower-band signal above the estimated bandwidth.