SUB BAND SPLIT/SYNTHESIS METHOD AND ITS DEVICE

摘要

PURPOSE: To provide a sub band split/synthesis method and its device with simple configuration capable of high efficiency coding. CONSTITUTION: The device is provided with a sub band split device 2 comprising plural stages of cascade-connected basic sub band split means each consisting of a high pass filter (HPF-1), a low pass filter (LPF-1) and a down-sampler (DS-1) in cascade connection to the (LPF-1) and with a sub band synthesis device 3 comprising plural stages of cascade-connected basic sub band synthesis means each consisting of an up-sampler (US-1) and a low pass filter (LPF-4) connected in cascade and an adder 4.