Patent ID: 6850179
Filing Date: 2005-02-01
Classification: G10L

Abstract:
1. An encoding apparatus for encoding an acoustic time series signal such that the acoustic time series signal is split into band signals in predetermined bands and gain adjustment is made on the band signals, at a gain control position by a gain control amount, for each of as many positions as indicated by a gain control number, said encoding apparatus comprising: detection means for detecting a gain control number of a first arbitrary band signal of the band signals and a gain control number of a second band signal in a band adjacent to the band of the first band signal; calculation means for calculating the difference value between first gain control number detected by the detection means from the first band signal and second gain control number detected by the detection means from the second band signal; retaining means for retaining a table indicating a value-code correspondence in which a code with a small number of bits is assigned to a value having a high probability of being obtained as the result of the calculation of the difference value performed by the calculation means; gain control number encoding means for encoding the first gain control number such that a code corresponding to the difference value calculated by the calculation means is retrieved from the table and the retrieved code is employed as the code of the first gain control number; gain control amount information encoding means for encoding gain control amount information indicating a particular value corresponding to the gain control amount; and gain control position information encoding means for encoding gain control position information indicating a particular value corresponding to the gain control position.