System for the multiplexed transmission of signals from seismic

Communications: electrical – Selective – Having electron beam device

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179 15AL, 179 15AQ, 340 155DP, G01V 100, H04J 312

Patent

active

039861627

ABSTRACT:
An installation for the multiplexed transmission of signals from seismic eivers, each associated with a respective multiplexing circuit, connected in series in a transmission line between a generator of first pulse signals and a registration station. Each receiver is followed by a digitiser and each multiplexing circuit includes means allowing the first pulse signals to pass without modification, at least one shift register, capable of being filled with digital information from the associated receiver and connected in series in the transmission line, means for detecting the first pulse signals coupled upstream in the transmission line, and means for applying clock signals to the shift registers after each detection of the first pulse signal.

REFERENCES:
patent: 3652979 (1970-03-01), Angelle
patent: 3748638 (1973-07-01), Montgomery et al.
patent: 3851302 (1974-11-01), Schmitt

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