DECODING DEVICE, ENCODING DEVICE, DECODING METHOD, ENCODING METHOD, TERMINAL DEVICE, AND BASE STATION DEVICE.

摘要

This decoding device (100) decodes core encoded data obtained by encoding a low-frequency spectrum of and below a predetermined frequency and expanded-band encoded data obtained by encoding a high-frequency spectrum of at least a predetermined frequency on the basis of the core encoded data, wherein the decoding device (100) has: an amplitude normalization unit (103) for causing the amplitude of a core decoded spectrum obtained by decoding the core encoded data to be normalized by the maximum value of the amplitude of the core decoded spectrum, and generating a normalized spectrum; a noise generation unit (104) for generating a noise spectrum; a first adder (105) for adding the noise spectrum to the normalized spectrum and generating a noise-added normalized spectrum; and an expanded band decoding unit (106) for decoding the expanded band encoded data using the noise-added normalized spectrum and generating a noise-added expanded band spectrum.