Motorola Corporation

Robert F Lay

Steven C Jasper

Mark A Gannon

Gregory W Cox

Manuel P Gabato

Douglas M Hamilton

EMI spur interference is reduced in a system where the desired signal has periodically repeating components without destructively interfering with the repeating components. The frequency of the spur interference is determined (203) and fed to a notch filter (201) so as to center the notch at the frequency of the spur interference. Determination of the frequency is scheduled (601) to avoid cancellation of desired periodically repeating components of the signal.

Method and apparatus for scheduling adaptation for a notch filter

A monitor (102) is suitable for monitoring the data integrity of a comb filter (101). Generally, the filter will include at least one differencer stage, at least one buffer stage, and at least one integrator stage, including an output integrator stage (500). The output integrator stage will include a most-significant input bit (150) ('I'), a most-significant output bit (130) ('O'), and a carry bit (140) ('C'). In one embodiment, the monitor includes a detector (600) for detecting an overflow condition in the filter based on the equation (inverse C) * (O) * (I)+(C) * (inverse O) * (inverse I). The monitor also includes a waveform generator (700) that, in response to the occurrence of an overflow condition, generates a resetting waveform (170) of a predetermined shape and time duration, that is then coupled to the resetting terminals of all stages in the filter.

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Elgin, IL, United States of America

Robert F Lay