Telegraphy – Systems – Printing
Patent
1977-11-03
1978-10-31
Claffy, Kathleen H.
Telegraphy
Systems
Printing
178 70R, 179 15AD, 325 13, 325 38A, 328164, H04B 336
Patent
active
041236254
ABSTRACT:
A digital repeater for the regeneration of partial-response signals having improved noise immunity which basically comprises an equalizer followed by a regenerator. A band limiting filter disposed between the equalizer and regenerator transforms the partial-response signal to a modified form having the same or fewer levels and concurrently reduces the total power of the noise interference. A second filter disposed after the regenerator and having an inverse transfer function replicates the partial-response signal at its output so that the repeater appears transparent to the transmission line.
REFERENCES:
patent: 2996578 (1961-08-01), Andrews, Jr.
patent: 3261986 (1966-07-01), Kawashima et al.
patent: 3736414 (1973-05-01), McAuliffe
patent: 3798544 (1974-03-01), Norman
patent: 3924080 (1975-12-01), Caldwell
patent: 3993953 (1976-11-01), Lender et al.
patent: 4078157 (1978-03-01), Lender et al.
patent: 4078159 (1978-03-01), Lender et al.
Claffy Kathleen H.
Mowle John E.
Myers Randall P.
Northern Telecom Limited
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