DIGITAL FILTER BANK DEVICE AND ITS OPERATING METHOD

PROBLEM TO BE SOLVED: To provide the digital filter bank device in which the digital filter configuration is simplified by using a minimum scale of the hardware. SOLUTION: A digital filter bank device 10 is configured hierarchically by using a feedback mechanism and operated at a prescribed frequency based on reduction in a multiplex rate mechanism. The digital filter bank device 10 operates a sum of products to generate a filter output signal 41 according to an arithmetic operation and the arithmetic operation is conducted according to a distributed arithmetic algorithm. The use of a minimum scale of the hardware is attained by using the multiplex rate mechanism reduction and the discrete arithmetic algorithm so as to conduct signal processing. The configuration area of the semiconductor device is reduced by using the digital filter bank device.