A DIGITAL FILTERING SYSTEM OF CHANNEL FREQUENCIES FOR MOBILE COMMUNICATIONS' REPEATERS BY USING TIME-SHARING METHOD

摘要

A digital filtering system of channel frequencies for mobile communications repeaters by using time-sharing method are provided to change the configuration when the frequency band usage of the communications common carrier is changed or the allocating frequency channel is changed. The time sharing frequency digital filter device is comprised of the tap coefficient storage(410), multiplier(420), adder(430), delay unit(440), selector(450) and time sharing clock generator(460). The tap coefficient storage stores the tap coefficient of M. The adder delays the applied value and the result value from the multiplier to feed back and adds applied value. The delay unit delays the applied return value from the adder. The time sharing clock generator generates M times rapid clock of the main clock and authorizes in the tap coefficient storage and delay unit.