Pulse or digital communications – Repeaters – Testing
Patent
1984-06-28
1987-03-24
Safourek, Benedict V.
Pulse or digital communications
Repeaters
Testing
329105, 375107, 3408252, 455 51, H04L 702, H04L 2706
Patent
active
046530720
ABSTRACT:
An on-off keyed carrier signal is demodulated by quadrature sampling of the incoming carrier signal at twice carrier frequency to provide short term digital patterns indicating detection of an incoming signal of carrier frequency. A number of phase counting channels are provided which count the number of times a particular pattern is detected during a longer interval, preferably a sixth of a bit interval at the baud rate of the received message. Since the phase counters are reset every sixth of a bit they can collectively accommodate a substantial drift in phase of the received carrier during reception of a complete 33 bit message while still operating asynchronously with respect to the received carrier.
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Verbanets, Jr. William R.
Vercellotti Leonard C.
Safourek Benedict V.
Westinghouse Electric Corp.
Yatsko M. S.
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