INSTALLATION DE TRANSMISSION MULTIPLEXEE DE SIGNAUX SISMIQUES

摘要

A plurality of digital detectors (e.g. of seismic vibrations) provide and store digital signals representative of samples of a detected quantity. The detectors are connected in series by a transmission path having a pulse generator at one end and a recording unit at the opposite end. First pulse signals are generated at a multiplexing cycle frequency by the pulse generator. The digital detectors include means for recognising a first pulse signal, means for suppressing or at least altering the recognised first pulse signal before relaying it to the next digital detector and means responsive to the recognised first pulse signal for applying the stored digital signal to the transmission path followed by a new first pulse signal. The next digital detector relays the digital signal(s) of the previous digital detector(s), recognises the new first pulse signal at the end of the said digital signal(s) and adds its own digital signal to the succession of digital signals followed by another new first pulse signal. In this way a multiplexed succession of digital signals from the plurality of detectors is built up and then stored at the recording unit.