Ganged-speaker siren system with substantially uniform...

Details Ganged-speaker siren system with substantially uniform... Ganged-speaker siren system with substantially uniform...

G - Physics

08

B

116/47

G08B 3/00 (2006.01) G10K 11/02 (2006.01)

Patent

CA 1211659

ABSTRACT Electronic outdoor warning siren systems which include a plurality of speakers arranged in one or more vertically spaced circular arrays of cir- cumferentially spaced vertically oriented speakers to achieve substantially uniform coverage in all radial directions in a horizontal plane, and utilizing fre- quency variations in adjacent speakers to minimize interference between sound signals from adjacent speak- ers 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° to accomplish the same result of minimal interference and more uniform sound propagation.

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