Communications: electrical – Selective – System having rectifier
Patent
1967-09-06
1976-10-05
Moskowitz, Nelson
Communications: electrical
Selective
System having rectifier
340258D, 340261, 340224, 340412, G01S 380, G01D 2104
Patent
active
039848035
ABSTRACT:
A system for monitoring man-associated seismic movements within a control area including a geophone for generating an electrical signal in response to seismic movement, a bandpass amplifier and threshold detector for eliminating unwanted signals, pulse counting system for counting and storing the number of seismic movements within the area, and a monitoring system operable on command having a variable frequency oscillator generating an audio frequency signal proportional to the number of said seismic movements.
REFERENCES:
patent: 3171108 (1965-02-01), MacKeen
patent: 3261009 (1966-07-01), Stetten et al.
patent: 3296587 (1967-01-01), Baker
Hawk Hervey L.
Hawley James G.
Portlock John M.
Scheibner James E.
Carlson Dean E.
Constant Richard E.
King Dudley W.
Moskowitz Nelson
The United States of America as represented by the United States
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