Method and apparatus for regenerating a modified duobinary signa

Details Method and apparatus for regenerating a modified duobinary signa Method and apparatus for regenerating a modified duobinary signa

1976-10-18

1978-03-07

Claffy, Kathleen H.

Telegraphy

Systems

Printing

178 70R, 179 15AD, 325 13, 325 38A, 328164, H04B 336

Patent

active

040781577

ABSTRACT:
In PCM transmission, it is well known to transmit 24 voice-grade channels at a bit rate of 1.544 Megabits per second (Mb/s). The number of channels which may be transmitted in about the same bandwidth is doubled by the use of correlative level coding, such as the modified duobinary technique. Because of the degradation experienced by the modified duobinary signal in passing over cable pairs, periodic regeneration of the signals is required for effective transmission. The present invention is directed to a regenerative repeater which equalizes, amplifies, reshapes, and retimes the received modified duobinary signal so as to provide a regenerated signal which is nearly identical with that originally transmitted.

REFERENCES:
patent: 2996578 (1961-08-01), Andrews, Jr.
patent: 3390283 (1968-06-01), Hannigsberg
patent: 3585300 (1971-06-01), Kawashima et al.
patent: 3590386 (1971-06-01), Tisi et al.
patent: 3760111 (1973-09-01), Sawai
patent: 3798544 (1974-03-01), Norman
patent: 3993952 (1976-11-01), Roza

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