Pulse or digital communications – Repeaters – Testing
Patent
1982-03-29
1984-09-18
Griffin, Robert L.
Pulse or digital communications
Repeaters
Testing
375 34, 340347DD, H04B 162
Patent
active
044728131
ABSTRACT:
In a transmission system of a class IV partial response code succession produced in accordance with a predetermined encoding rule, a transmitter intentionally violates the encoding rule to carry a subsidiary signal, so that an intentional violation appears in a receiver as two consecutive violation signals located in every other time slot, differing from an unintentional violation occurring during transmission. In the transmitter, an intermediate succession from a precoder is monitored by a detection circuit to detect an appearance of each predetermined pattern and to give the intentional violation to the code succession. In the receiver, a violation detector detects both of the intentional and the unintentional violations in accordance with a detecting rule to produce a violation signal sequence. The two consecutive violation signals are distinguished from the violation signal sequence by another detector. As the predetermined patterns, two and twelve patterns are usable in a binary and a quaternary system, respectively.
REFERENCES:
patent: Re30182 (1979-12-01), Howson
patent: 3829779 (1974-08-01), Fujimoto
patent: 3947767 (1976-03-01), Koike et al.
patent: 4086566 (1978-04-01), Lender
Kobayashi Eiichi
Koike Shin'ichi
Chin Stephen
Griffin Robert L.
Nippon Electric Co. Ltd.
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