Communications: electrical – Audible indication – Ultrasonic pest control
Patent
1989-03-24
1991-04-30
Crosland, Donnie L.
Communications: electrical
Audible indication
Ultrasonic pest control
340384R, 340329, 340460, 340463, 340474, 340405, 340692, 381 86, G08B 300
Patent
active
050122215
ABSTRACT:
An emergency vehicle audible warning system and method for improving emergency vehicle mission effectiveness and reducing the undesirable side effects of emergency vehicle audible warning systems. The audible warning system projects different selectable sound phrases that indicate varying levels of urgency. Periods of silence are included between sound phrases for, among other purposes, improving listener attentiveness and allowing operators of emergency vehicles to hear other approaching emergency vehicles. Urgency is further indicated by varying the duration of silent period between sound phrases with speed changes of the emergency vehicle. Higher and broader frequency spectrums compared to typical warning systems are utilized in order to better penetrate other vehicles and to project a less harsh, yet still effective warning. Forward-directional and rear-directed acoustic radiators projecting dissimilar sound phrases cue listeners to whether the emergency vehicle is approaching or departing the listener's vicinity.
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Neuhaus Max
Reinagel Frederick G.
Crosland Donnie L.
Siren Sounds, Inc.
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