Electronic outdoor warning siren
First Claim
1. An electronic outdoor warning siren system, which comprises:
- speaker mounting means for supporting a plurality of speakers;
a plurality of speakers connected to said speaker mounting means and arranged in a common horizontal plane;
electronic tone generator means for driving adjacent speakers of said plurality of speakers with signals of different frequency so each speaker will operate at a frequency different from a speaker adjacent thereto in the same horizontal plane, whereby the uniformity of sound distribution is enhanced.
1 Assignment
0 Petitions
Accused Products
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° to accomplish the same result of minimal interference and more uniform sound propagation.
30 Citations
9 Claims
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1. An electronic outdoor warning siren system, which comprises:
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speaker mounting means for supporting a plurality of speakers; a plurality of speakers connected to said speaker mounting means and arranged in a common horizontal plane; electronic tone generator means for driving adjacent speakers of said plurality of speakers with signals of different frequency so each speaker will operate at a frequency different from a speaker adjacent thereto in the same horizontal plane, whereby the uniformity of sound distribution is enhanced. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification