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SOME ELECTRONIC SIMULATORS OF GALVANOMETERS AND GEOPHONES, AND THEIR USE FOR INVERSE FILTERING *
Author(s) -
HOSKEN J. W. J.
Publication year - 1965
Publication title -
geophysical prospecting
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.735
H-Index - 79
eISSN - 1365-2478
pISSN - 0016-8025
DOI - 10.1111/j.1365-2478.1965.tb01939.x
Subject(s) - geophone , inverse filter , signal (programming language) , galvanometer , amplifier , transducer , acoustics , electronic circuit , distortion (music) , filter (signal processing) , inverse , computer science , electronic engineering , engineering , electrical engineering , physics , telecommunications , bandwidth (computing) , optics , mathematics , laser , geometry , programming language
A bstract Electronic circuits are described which simulate the effects of galvanometers and geophones. By placing these circuits in the feedback loop of an operational amplifier it is possible to obtain transfer functions which are the inverse of those of the transducers. That is, they will remove the distortion on the signal which was produced by the geophone or the galvanometer. Both a geophone simulator and its inverse filter have been built and used (O'Brien, 1965). The simulator is accurate over at least seven octaves and the inverse filter restores the ground signal to what it would have been if the recording geophone had had a natural frequency √n+1 times that of the actual geophone, where A is the gain of the operational amplifier used in the circuit.