Signal characteristic state detector using interval-count proces

Details Signal characteristic state detector using interval-count proces Signal characteristic state detector using interval-count proces

1980-07-09

1982-05-18

Britton, Howard

Pulse or digital communications

Repeaters

Testing

375114, H04C 700, H04C 2722

Patent

active

043308627

ABSTRACT:
Received baseband data signals, in the form of signals having at least one level transition per symbol indicative of symbol information state, are sampled (17) at a rate much higher than the symbol rate. The samples are used to control the direction of counting (20) of local clock (12) signals recurring at that higher rate during symbol subintervals of predetermined duration. Counts produced during adjacent subintervals are processed (FIGS. 4 and 5) to produce several different results such as recognition of the start of an asynchronously occurring data message, acquisition and tracking of symbol phase in the message, and detection of symbol information states.

REFERENCES:
patent: 4010323 (1977-03-01), Peck
patent: 4029900 (1977-06-01), Addeo
1978 National Telecommunications Conference Record, Dec. 3-6, 1978, pp. 30.2.1-30.2.5, R. Matyas et al., "Digital Implementation of an FFSK Modem".

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