Horology: time measuring systems or devices – Time interval – Electrical or electromechanical
Patent
1990-06-06
1991-02-19
Miska, Vit W.
Horology: time measuring systems or devices
Time interval
Electrical or electromechanical
368120, G04F 800
Patent
active
049950193
ABSTRACT:
An adaptive time period measurement technique which provides full speed for every measurement period with increased resolution afforded from repeated measurements. The time measure is produced by adaptively filtering a number of prior time measures. Each measurement includes a count and a fractional part from a controlled variable delay interposed in the measurement system. This variable delay is controlled over a number of measurements to cover the entire range of one clock cycle, preferably in accordance with a reversed binary progression algorithm. The adaptive filtering is preferably a self-modifying, classic low pass filter with a roll off which depends on the rate of change and direction of change of the measurerd time period. Thus the present invention provides all the resolution feasible based upon the rate of change of the measured quantity.
REFERENCES:
patent: 3637733 (1987-01-01), Charles et al.
patent: 4516861 (1985-05-01), Frew et al.
patent: 4603292 (1986-07-01), Russeu
patent: 4845691 (1989-07-01), Itaya et al.
patent: 4855969 (1989-08-01), Mydill
patent: 4879700 (1989-11-01), MacIntyre
MagneTek Controls
Miska Vit W.
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