Pulse or digital communications – Repeaters – Testing
Patent
1983-02-11
1985-06-11
Griffin, Robert L.
Pulse or digital communications
Repeaters
Testing
375 25, 371 37, G06F 1112
Patent
active
045233233
ABSTRACT:
A digital signal communication system has a transmitter for differentially converting first digital signals of n trains (n is an integer of 3 or larger) into a second digital signal of n trains comprising a plurality of words. Responsive to the second digital signals, a modulated signal is provided with 2.sup.n (=N) modulation levels, which are transmitted. A receiver responds to the modulated signals, and demodulates them to provide signals of n trains corresponding to the second digital signals. This demodulated signal is differentially converted to provide n trains of signals corresponding to the first digital signals. The Hamming distance between two words of said second digital signals corresponding to the adjacent two modulation levels is either 1 or 2 and the numbers of the Hamming distances of 1 and 2 equal N/2, respectively.
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Hashimoto Hiromi
Nakajima Masahiro
Chin Stephen
Griffin Robert L.
Nippon Electric Co. Ltd.
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