APPARATUS AND METHOD FOR ENCODING AND DECODING BY APPLYING TO ADAPTIVE WINDOW SIZE

摘要

A coding apparatus and a method for adaptively applying a window size are provided to improve a compression efficiency and sound quality and to apply a window size by a kind of subbands according to signal characteristics. A band dividing unit(100) divides an input signal into a plurality of subbands. A window size determining unit(110) determines a window size to be applied to each divided subband. A conversion unit(120) converts a signal of each subband from a time domain to a frequency domain with the determined window size. A quantization unit(130) quantizes the converted signals. The window size determining unit determines the window size by using an energy value of each divided subband or by using the degree in which a signal of each divided subband changes.