Signals and indicators – Horns – whistles and compressional wave generators – Variable tone
Patent
1985-01-16
1987-12-01
Frankfort, Charles
Signals and indicators
Horns, whistles and compressional wave generators
Variable tone
116147, G10K 706
Patent
active
047096527
ABSTRACT:
A pneumatic sweep generator for use as an audio source in tests near vocal frequency ranges. A horn, whose volume may be controlled by air pressure and whose tone may be controlled by air velocity, is connected to an air supply in a dual-circuit arrangement. Mechanical control devices, such as manual and pressure release valves, are located within the circuit to provide for tone and volume control. A reciprocating air cylinder continuously varies the air velocity within the horn to sweep the frequencies in an adjustable manner. Electromagnetic interference is totally eliminated by a complete absence of electrical devices in either the device or in necessary controls.
REFERENCES:
patent: 471015 (1892-03-01), Nessle
patent: 1324784 (1919-12-01), Barr
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patent: 3226671 (1965-12-01), Padberg
patent: 3265152 (1966-09-01), Kass
patent: 3802283 (1974-04-01), Bahrton
patent: 4421473 (1983-12-01), Londerville
Douglass, Jr. Harold E.
Mahaffee, III Joseph W.
Corr Denis E.
Frankfort Charles
Maser Thomas O.
The United States of America as represented by the director of t
Utermohle John R.
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