Pulse or digital communications – Repeaters – Testing
Patent
1983-03-01
1985-03-05
Griffin, Robert L.
Pulse or digital communications
Repeaters
Testing
375 94, 340347DD, H03K 1302
Patent
active
045035466
ABSTRACT:
A two-level alternate mark inversion signal transmission system wherein binary pulses of "1" and "0" levels are converted into a pulse signal in which one coded information value has its polarity inverted at a period T and the other has its polarity reversed at a period T/2, and the converted signal is transmitted. In order to facilitate an automatic gain control operation and the proper and reliable extraction of a timing signal on the receiving side of the system even when the zero binary pulses have successively arisen in the signal processed on the transmitting side, the alternate mark inversion signal is converted into a specified code (zero substitution) signal when the zero binary pulses have succeeded one another for a predetermined number of times, while on the receiving side, a received signal is subjected to duobinary shaping, whereupon the zero substitution part is detected for removal by utilizing the rules of the zero substitution process and the alternate mark inversion signal.
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Nagano Katsuyuki
Takahashi Yasushi
Takasaki Yoshitaka
Yamada Mitsuo
Yoshine Hiroki
Chin Stephen
Griffin Robert L.
Hitachi , Ltd.
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