Communications: electrical – Audible indication – Ultrasonic pest control
Patent
1988-07-15
1990-05-15
Crosland, Donnie L.
Communications: electrical
Audible indication
Ultrasonic pest control
340384R, 381 681, 381 682, 310321, G08B 300
Patent
active
049261592
ABSTRACT:
An apparatus and method to generate high intensity sound having a strong directional characteristic. The apparatus preferably uses a sound element (e.g. piezo sounder) which is capable of generating a high intensity, power efficient sound, but which has poor directional characteristics because of its high frequency (e.g. 3000 Hz). The apparatus drives the sound element with a variable frequency signal which sweeps across the resonant bandwidth of the sound element. The sweep rate of the frequency shift is less than about 1200 Hz which gives the sound a directional characteristic--resulting in periodic bursts of high intensity sound that is strongly directional. The apparatus may be incorporated into a wide variety of applications where high intensity, power efficient, strongly directional sound is desirable. In the preferred embodiment, the sound generator of the present invention is incorporated into a personal alert warning device worn by fireman or other safety personnel to emit a directional sound if the wearer becomes disabled.
REFERENCES:
patent: 4459037 (1984-07-01), Toyoda
patent: 4486742 (1984-12-01), Kudo et al.
Crosland Donnie L.
Detex Corporation
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