Unobtrusive signature for modulated signals

Details Unobtrusive signature for modulated signals Unobtrusive signature for modulated signals

1987-08-07

1990-07-03

Eisenzopf, Reinhard J.

Pulse or digital communications

Repeaters

Testing

375111, 3701001, H04L 516, H04L 704

Patent

active

049397486

ABSTRACT:
A system for transmitting data signals over a communications channel comprises a transmitter modem having means for encoding data signals and a generator for superimposing a first signature signal on the encoded data and a receiver modem which superimposes a second signature signal on the received data. The second signature signal is identical to the first such that the signature signals cancel each other if the transmitter and receiver modems are in synchronism.

REFERENCES:
patent: 3546384 (1970-12-01), Brigham
patent: 3767855 (1973-10-01), Veno et al.
patent: 3955141 (1976-05-01), Lyon et al.
patent: 4171513 (1979-10-01), Otey et al.
patent: 4433425 (1984-02-01), de Jaeger
patent: 4435825 (1984-03-01), Tomooka
patent: 4472817 (1984-09-01), Poklemba et al.
patent: 4479258 (1984-10-01), Namiki
patent: 4494240 (1985-01-01), Payton
patent: 4706245 (1987-11-01), Suzuki
patent: 4736388 (1984-04-01), Eguchi

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