Manchester decoder

Details Manchester decoder Manchester decoder

1983-06-02

1985-06-25

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

360 42, 375104, 328120, H03D 322

Patent

active

045258481

ABSTRACT:
A circuit for generating a timing signal in a Manchester decoder comprises an oscillator 10, a frequency divider 14 for dividing signals derived from the oscillator, and a comparator 18 for comparing the times of transitions in the output signal of the divider with transitions in input Manchester data. To form a digital phase locked loop, gates 12 and 16 are provided for selectively adding a pulse to and subtracting a pulse from the pulses applied to the divider 14 by the oscillator 10 in dependence upon the relative timing determined by the comparator 18, in such manner as to lock the phase of the output signal of the divider onto the phase of the Manchester data. A squelch circuit is also provided for inhibiting phase control by the comparator 18 in response to a drop in signal strength of the received signal containing the Manchester data.

REFERENCES:
patent: 3102164 (1963-08-01), Roiz
patent: 3790892 (1974-02-01), Tan et al.
patent: 3819853 (1974-06-01), Stein
patent: 3882412 (1975-05-01), Apple, Jr.
patent: 4191975 (1980-03-01), White et al.
patent: 4363002 (1982-12-01), Fuller
patent: 4385396 (1983-05-01), Norton

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