Digital filter circuit

Details Digital filter circuit Digital filter circuit

H - Electricity

03

H

328/0.5

H03H 17/04 (2006.01)

Patent

CA 1078463

DIGITAL FILTER CIRCUIT Abstract of the Disclosure In the prior art, limit cycle noise is reduced in a second order recursive digital filter by a circuit which randomly inhibits the rounding signal in one of the digital multipliers disposed in the filter. In the present disclosure, random inhibiting is con- strained to instances in which limit cycle noise is reduced, by monitoring, with suitable logic circuitry, the signals present in the various feedback loops of the filter. Generally, it has been found that the inhibiting circuit should be allowed to operate only if D1 and D2 satisfy pre- determined magnitude and polarity relationships, where D1? a version of the filter output signal Y(n) that is removed in time by one sample interval, and D2 ? a version of the filter output signal Y(n) that is removed in time by two sample intervals. The result is the avoidance of larger transients.

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