Data transmission using a transparent tone-in band system

Details Data transmission using a transparent tone-in band system Data transmission using a transparent tone-in band system

1987-02-26

1989-01-31

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

375 61, 375 77, 375 97, 455 46, 455 71, H04B 168

Patent

active

048021911

ABSTRACT:
In previous transparent tone-in band systems the notch has been removed from the frequency spectrum before a carrier signal carrying data has been demodulated. The present specification describes an arrangement in which data is recovered by first and second mixers from a signal having a spectrum containing a notch. Phase and frequency locking is obtained: either by using a third mixer fed from the inputs to the first and second mixers to provide, indirectly, one signal for a fourth mixer which also receives the carrier signals and provides demodulating signals for the first and second mixers; or by a correction system coupled to the outputs of the first and second mixers for correcting demodulating signals supplied to these mixers.

REFERENCES:
patent: 3271681 (1966-09-01), McNair
patent: 3271682 (1966-09-01), Bucher, Jr.
patent: 3349181 (1967-10-01), Ito
patent: 3492580 (1970-01-01), Berman
patent: 3969675 (1976-07-01), Gosling
patent: 4675880 (1987-06-01), Davarian

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