Pulse or digital communications – Spread spectrum – Direct sequence
Patent
1981-06-24
1985-02-05
Safourek, Benedict V.
Pulse or digital communications
Spread spectrum
Direct sequence
3408255, 364466, 371 32, G06F 1502, H04L 2538
Patent
active
044981872
ABSTRACT:
An electronic postal meter has a control unit, an accounting unit and a printing unit, each incorporating a CPU having a separate crystal controlled clock. Communication between the units is serial character asynchronous, bit synchronous, in message form, with the bits of the messages being timed in accordance with a given schedule for synchronous control. The messages themselves, upon receipt by a receiver, are returned bit by bit to the transmitter, for checking, whereupon the transmitter sends a no-error pulse upon successful comparison of the transmitted message and the message received from the receiver. All control and data signals utilize the same pair of conductors in each direction with precisely defined timing for control.
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Eckert Alton B.
McFiggans Robert B.
Soderberg John H.
Pitchenik David E.
Pitney Bowes Inc.
Safourek Benedict V.
Scribner Albert W.
Soltow, Jr. William D.
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