Boots – shoes – and leggings
Patent
1995-10-20
1998-07-21
Trammell, James P.
Boots, shoes, and leggings
364148, 327277, 327250, H04B 500
Patent
active
057842728
ABSTRACT:
In a control system a characteristic quantity of a process (1) exhibits a periodic disturbance. A measuring system (2) generates a measuring signal (Vm) which represents the characteristic quantity. A control device controls the process in response to the measuring signal (Vm). To reduce the periodic disturbance, the control device (3) comprises a delay circuit (4) which delays an input signal (Vin) related to the measuring signal (Vm) by a time interval (T) having the length of a period (Tp) of the periodic disturbance. The control device (3) comprises an analysis circuit (6) for deriving an analysis signal (Va) which is indicative of a deviation between the period of the periodic disturbance and the delay time. By means of a control circuit (13) and an adapter circuit (7), the delay time (T) is set in dependence on the analysis signal (Va) to a value for which the analysis signal (Va) indicates that the delay time (T) is equal to the period (Tp). A correlation system can be used for deriving the analysis signal (Va).
REFERENCES:
patent: 4286318 (1981-08-01), Immink et al.
patent: 4821168 (1989-04-01), Gotou
patent: 4973962 (1990-11-01), Shimizu
patent: 5493588 (1996-02-01), Lennen
patent: 5638022 (1997-06-01), Eatwell
Schootstra Gerrit
Steinbuch Maarten
Belk Michael E.
Kaminis Shah
Trammell James P.
U.S. Philips Corporation
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