Patent ID: RE45042

Claim:
An encoding device that encodes an input signal comprising: a time-frequency transforming unit operable to transform an input signal in a time domain into a frequency spectrum including a lower frequency spectrum; a band extending unit operable to generate extension data used for specifying a higher frequency spectrum at higher frequency than the lower frequency spectrum; and an encoding unit operable to encode the lower frequency spectrum and the extension data, and output the encoded lower frequency spectrum and extension data, wherein the band extending unit generates a first parameter and a second parameter as the extension data, the first parameter is used to determine a partial spectrum which is to be copied as the higher frequency spectrum from among a plurality of the partial spectrums which form the lower frequency spectrum, and the second parameter is used to determine a gain of the partial spectrum after being copied, and wherein the band extending unit generates, as the extension data, a third parameter which is used to determine whether or not the partial spectrum to be copied is inverted on a frequency domain.