Encoding device, decoding device, and method thereof

The bus is a frequency spectrum code of wideband signal, capable of realizing while the low bit rate improving the original signal a high frequency spectrum and new generating the similar encoder of frequency spectrum. The innertube oscillation amplitude computing unit of the device (122) and (128) is that the vibration amplitude of each innertube of the high frequency spectrum for wideband signal obtaining. Search unit (124) of the codebook multiple (125) and one part of innertubes of the innertubes, the gain of innertube and a selected and code object. The interpolation unit (126) is for mutual an to the gain of selecting, and are formed with the gain of chosen innertube.