Communications: electrical – Selective – Addressing
Patent
1976-06-10
1978-02-21
Tudor, Harold
Communications: electrical
Selective
Addressing
310322, 310334, 340 10, 340 14, H04B 1300
Patent
active
040756009
ABSTRACT:
An acoustic transducer for simultaneously producing broadband sound sources n the conventional and overtone resonance modes. Two sets of ceramic and aluminum discs are fixed adjacent each other with the ceramic discs of each set facing one another across an air gap. By selection of respective relative diameters and thicknesses for the ceramic and aluminum discs, the transducer exhibits dual resonance output signals when excited by an input voltage.
REFERENCES:
patent: 3202962 (1965-08-01), Elston
patent: 3249912 (1966-05-01), Straube
patent: 3271596 (1966-09-01), Brinkerhoff
patent: 3321189 (1967-05-01), Scarpa
patent: 3457543 (1969-07-01), Akervold et al.
patent: 3708702 (1973-01-01), Brunnert et al.
patent: 3800271 (1974-03-01), Stillman, Jr.
patent: 3832762 (1974-09-01), Johnston et al.
patent: 3970878 (1976-07-01), Berglund
patent: 3988620 (1976-10-01), McDavid
Ensign Thomas H.
Sims Claude C.
Hansen Henry
Iseman William J.
Sciascia R. S.
The United States of America as represented by the Secretary of
Tudor Harold
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