Recursive type digital filter

Details Recursive type digital filter Recursive type digital filter

H - Electricity

03

H

328/0.5

H03H 17/04 (2006.01)

Patent

CA 1116702

ABSTRACT OF THE DISCLOSURE A recursive type digital filter receiving a digital input signal x(n) having a plurality of bits and delivering a digital output signal y(n) satisfying the following equation, Image , where n indicates a natural number, M and N orders of time lag in the signal transference, ak and bk coefficients defined by a filter characteristic, aM and bN being coefficients which are not equal to zero, comprises an output control circuit for delivering a digital signal indicating a positive or negative limit value in place of the digital output signal y(n) when the amplitude of the signal y(n) exceeds an allowable value. In combination with this output control circuit, the filter also utilizes a feedback signal for calculation purposes which feedback signal has its amplitude reduced from that of y(n) by a predetermined ratio. Further, an arrangement is provided for clearing registers of filter when necessary to prevent overflow oscillation.

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