4497068 Encoding system for optic data link

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PATSEARCH SECTION

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4497068 ENCODING

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SYSTEM FOR OPTIC DATA LINK

Kenneth C Fischer assigned to Eaton Corporation

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Encoding circuitry is provided for optic digital data transmission. A transmitter transmits a pair of timed optic pulses of different duration in response to respective leading and trailing edges of a data pulse. A receiver reconstitutes the data pulse by decoding the different duration optic pulse widths. The receiver includes a pulse generator generating a pulse width between that of the pair of transmitted pulses, and compares the generated pulse width against the pulse width then received from the transmitter, for determining positive and negative-going transitions in the reconstituted data stream.

which depressed the keys, and the signal generated by the depressed character key is transmitted during a second period of time following the key-stroke which depressed the keys, the second period having an initial instant following the last instant of the first period. To achieve this result the character signal is delayed, so that an associated printer receives and is capable of performing the function commanded by the function signal before the printer is caused to print the character of the character signal which is subsequently received.

4498193 JAMMER

TRANSMITTER

Christopher K Richardson, Romsey, United Kingdom assigned to Plessey Overseas Limited

4498073 T

KEYBOARD WITH SIMULTANEOUS OPERATIONS

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Charles B Fisher, Sidney T Fisher, Montreal, Quebec, Canada A keyboard in which, when one of the function keys is depressed simultaneously with one of the character keys, the signal generated by the depressed function key is transmitted during a first period of time following the key-stroke TELEMATICS and INFORMATICS

A jammer transmitter having a comb spectrum generator which includes a pulse generator adapted to produce a pulse train at a frequency corresponding to the channel spacing of signals to be jammed, and a bandpass filter which has a passband including a bandwidth occupied by the

Vol. 2, No. 4, pp. V-XI, 1985 Copyright © 1986 Pergamon Press Ltd. Printed in USA 0736-5853185 $3.00 + .00