Patent ID: 9691410
Date: 2017-06-27
CPC Classifications: G10L

Claim:
1. An encoding device comprising: sub-band dividing means configured to divide an input signal into a plurality of sub-bands, and to generate a low frequency sub-band signal made up of a plurality of sub-bands at a low frequency side and a high frequency sub-band signal made up of a plurality of sub-bands at a high frequency side; feature amount calculating means configured to calculate feature amount that expresses a feature of said input signal, using at least one of said low frequency sub-band signal generated by said sub-band dividing means, and said input signal; pseudo high frequency sub-band power calculating means configured to calculate a pseudo high frequency sub-band power that is a pseudo power of said high frequency sub-band signal based on said feature amount calculated by said feature amount calculating means; pseudo high frequency sub-band power difference calculating means configured to calculate a high frequency sub-band power that is the power of said high frequency sub-band signal from said high frequency sub-band signal generated by said sub-band dividing means, and to calculate pseudo high frequency sub-band power difference that is difference as to said pseudo high frequency sub-band power calculated by said pseudo high frequency sub-band power calculating means; high frequency encoding means configured to encode said pseudo high frequency sub-band power difference calculated by said pseudo high frequency sub-band power difference calculating means to generate high frequency encoded data; low frequency encoding means configured to encode a low frequency signal that is a low frequency signal of said input signal to generate low frequency encoded data; and multiplexing means configured to multiplex said low frequency encoded data generated by said low frequency encoding means, and said high frequency encoded data generated by said high frequency encoding means to obtain an output code string.