Patent ID: 7509254
Filing Date: 2009-03-24
Classification: G10L

Abstract:
1. 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 to be used to specify a higher frequency spectrum in a higher frequency band 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 is operable to generate a first parameter and a second parameter as the extension data, wherein the first parameter is used to specify an optimum partial spectrum which is to be copied as respective partial spectrums which form the whole of the higher frequency spectrum, from among a plurality of partial spectrums which form the whole or part of the lower frequency spectrum, and the second parameter is used to determine a gain of the partial spectrum after being copied, wherein the band extending unit is further operable to generate, as the extension data, a third parameter to be used to determine a frequency position of a partial spectrum including a lowest frequency component from among partial spectrums to be used to generate the extension data among the plurality of partial spectrums which form the lower frequency spectrum, and wherein the frequency position of the partial spectrum including the lowest frequency component can be arbitrarily selected in the lower frequency spectrum.