Pulse or digital communications – Repeaters – Testing
Patent
1988-08-23
1991-03-19
Safourek, Benedict V.
Pulse or digital communications
Repeaters
Testing
329310, 375 83, H04L 2722
Patent
active
050017284
ABSTRACT:
A binary encoded phase modulated signal (biphase signal) is demodulated by determining the period of time (T) elapsing between each two successive jumps in the level of the biphase signal; providing a clock frequency (B) approximately corresponding to the bit rate of the biphase signal with the aid of a clock generator; comparing the clock duration (1/B) of the clock frequency with the period of time (T) between each two jumps in level; and, with the aid of a sample and hold circuit controlled by the clock frequency (B), always ascertaining the logical value of the biphase signal and emitting a signal corresponding to the logical value whenever, immediately prior to a bit period, twice in succession, a value between 1/4 and 3/4 of 1/B is ascertained for the period of time (T), or a value between 3/4 and 5/4 of 1/B is ascertained for the period of time (T). Additionally, a signal characterizing interference can be emitted, or the output can be suppressed, if a value less than 1/4 of 1/B or greater than 5/4 of 1/B is ascertained as the period of time (T). This makes it possible, in the presence of a biphase signal, to recover the original data with high security in a relatively simple manner.
REFERENCES:
patent: 3243580 (1966-03-01), Welsh
patent: 3491349 (1970-01-01), Sevilla et al.
patent: 3903474 (1975-02-01), Wiley
patent: 4320525 (1982-03-01), Woodward
patent: 4608702 (1986-08-01), Hirzel et al.
Deutsche Thomson-Brandt GmbH
Safourek Benedict V.
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