Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1980-06-09
1983-02-22
Miller, Stanley D.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
307520, 307542, 340365E, H03K 1756, H03K 500
Patent
active
043750362
ABSTRACT:
A strobe generator in a data entry input device is responsive to an input strobe signal from a keyboard system to generate a strobe signal which is not affected by electrical noise produced by electrostatically or electromagnetically induced signals in the signal lines running between the keyboard system and the data entry device input logic. An accurate output strobe signal is generated by utilizing a retriggerable logic circuit to filter out noise signals of a duration shorter than a predetermined period. The predetermined period is chosen to be less than the minimum duration of a valid input strobe signal and greater than the duration of active noise signals. The strobe generator retains the output strobe signal in the active state by use of a flip-flop until the strobe generator receives a reset signal acknowledging that the output strobe signal has been sampled by the data entry device input logic. Once set, the flip-flop will remain set and its corresponding output strobe signal remain active until reset, even if subsequent input strobe signals of less than or greater than the predetermined period are received.
REFERENCES:
patent: 3668432 (1973-03-01), Rhodes
patent: 3749940 (1973-07-01), Diepart et al.
patent: 3753007 (1973-08-01), Viswanathan
patent: 3755691 (1973-08-01), Cassarino
patent: 3790821 (1974-02-01), Adamson
patent: 3962699 (1976-06-01), Branson
Miller Robert C.
O'Keefe David B.
Davis B. P.
Honeywell Information Systems Inc.
Linnell William A.
Miller Stanley D.
Prasinos Nicholas
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