Patent ID: 7895035

Claim:
A scalable decoding apparatus comprising: a decoding section that decodes narrowband spectral parameters corresponding to a core layer of a first scalable encoded signal; a storage section that stores wideband spectral parameters corresponding to an enhancement layer of a second scalable encoded signal, which differs from the first scalable encoded signal; and a concealment section that generates, when wideband spectral parameters corresponding to the enhancement layer of the second scalable encoded signal are lost, a loss concealment signal by weighted addition of a band converted signal of the decoded narrowband spectral parameters and the stored wideband spectral parameters, and conceals a decoded signal of the lost wideband spectral parameters using the loss concealment signal, wherein: the narrowband spectral parameters of the first scalable encoded signal comprise a first frequency band, and the wideband spectral parameters of the second scalable encoded signal comprise a second frequency band, which is broader than the first frequency band; the scalable decoding apparatus further comprises a conversion section that converts the decoded narrowband spectral parameters from the first frequency band to the second frequency band to generate the band converted signal; and the concealment section calculates a weighted addition using weighting coefficients set based on the first frequency band and the second frequency band.