Acoustics – Anatomic or prosthetic relation – Ear and mouth
Patent
1972-08-08
1976-11-30
Hubler, Malcolm F.
Acoustics
Anatomic or prosthetic relation
Ear and mouth
181122, 307232, 328109, 340258B, G01V 116, G08B 1300, H03K 520
Patent
active
039952231
ABSTRACT:
A detection system for indicating the presence of motorized equipment in a esignated area having an acoustic sensor, a seismic sensor and an acoustic signal transmitter. The seismic sensor output, processed to discriminate against vibrations of short duration, is fed, along with the acoustic sensor output, to an "ANDing" circuit which gates the acoustic transmitter. The acoustic sensor output is passed to the transmitter only during coincidence of seismic and acoustic detection.
REFERENCES:
patent: 3543172 (1970-11-01), Seppeler
patent: 3641443 (1972-02-01), Zerby
patent: 3705417 (1972-12-01), Asmussen
Cotilla Edward J.
Gimber George A.
Picard Salvatore R.
Starry Robert F.
Hansen Henry
Hubler Malcolm F.
Sciascia R. S.
The United States of America as represented by the Secretary of
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