Registers – Transfer mechanism – Traveling pawl
Patent
1974-07-17
1976-03-23
Gruber, Felix D.
Registers
Transfer mechanism
Traveling pawl
235183, 318611, 325477, 328167, G06G 766, H04B 110
Patent
active
039462110
ABSTRACT:
A filter is provided to substantially nullify the effect of process noise of less than a preset amplitude limit on the measurement of a process variable. The filter passes on to a controller or other device all signal changes greater than this amplitude. Within the amplitude limit the signal is damped by a first order lag with a filter time constant typically at least an order of magnitude greater than the average period of the noise to be filtered, but outside the amplitude limit, signal changes are passed immediately with no lag to a device such as a controller. The filter functions by generating a compensating signal essentially duplicating the process noise and then subtracting this compensating signal from the filter input signal, thus canceling this noise from the signal passed to the controller or other device. By subtracting only a limited value of this compensating signal from the filter input, changes of input greater than this limit are not compensated, and are thus immediately passed with no lag. On a sustained change of the input signal, the unlimited compensated signal will decay toward zero at the filter time constant, so that noise centering about the new sustained value of the input will be filtered.
REFERENCES:
patent: 3387221 (1968-06-01), Arberman et al.
patent: 3602737 (1971-08-01), Radecke
patent: 3611145 (1971-10-01), O'Connor
patent: 3643171 (1972-02-01), Chang
patent: 3654563 (1972-04-01), Hesler et al.
patent: 3665345 (1972-05-01), Dolby
patent: 3846719 (1974-11-01), Dolby
Korn & Korn: Electronic Analog Computers McGraw Hill 1956, Textbook, p. 13 of interest.
Gruber Felix D.
Leeds & Northrup Company
MacKay Raymond F.
Miller, Jr. William G.
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