Electronic outdoor warning siren

Details Electronic outdoor warning siren Electronic outdoor warning siren

1982-07-12

1986-12-30

Caldwell, Sr., John W.

Communications: electrical

Audible indication

Diaphragm

381 24, 181144, G08B 300, H04R 500, H05K 500

Patent

active

046332294

ABSTRACT:
Electronic outdoor warning siren systems which include a plurality of speakers arranged in one or more vertically spaced circular arrays of circumferentially spaced vertically oriented speakers to achieve substantially uniform coverage in all radial directions in a horizontal plane, and utilizing frequency variations in adjacent speakers in a given horizontal plane to minimize interference between sound signals from adjacent speakers thereby permitting closer spacing of speakers than would otherwise be feasible and providing uniform omni-directional sound propagation. The same frequency variations are also employed with a plurality of speakers oriented in the same direction and rotated through 360.degree. to accomplish the same result of minimal interference and more uniform sound propagation.

REFERENCES:
patent: 3100024 (1963-08-01), Leslie
patent: 3504364 (1970-03-01), Abel
patent: 3947635 (1976-03-01), Frankman
patent: 4054750 (1977-10-01), Montgomeny et al.
"Devices for Air Raid Warnings" National Bureau of Standerds, Oct. 23, 1942, Letter Circular LC-706.

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