Patent ID: 7400651
Filing Date: 2008-07-15
Classification: G10L,H04B

Abstract:
1. A frequency interpolation apparatus for reproducing a signal similar to an original signal by approximately recovering suppressed frequency components, from an input signal having the suppressed frequency components in a specific frequency band of the original signal, wherein the input signal is divided into a plurality of signal components having respective frequency components in a plurality of frequency bands, and each of the plurality of divided signal components is frequency-converted to a signal component in the same frequency band, and a signal component set in the band with the suppressed signal components is synthesized by executing a linear combination operation on the frequency-converted signal components, wherein the synthesized signal component set is frequency-converted to the specific frequency band, and a level of the synthesized signal component set is determined on the basis of the spectrum envelope information which is extracted from the frequency components not suppressed but residual in the original signal, and wherein the synthesized signal component set, which has been frequency-converted and whose level has been determined, is added to the input signal to recover the original signal.