Emergency vehicle audible warning system

Details Emergency vehicle audible warning system Emergency vehicle audible warning system

1975-02-18

1977-08-02

Curtis, Marshall M.

Communications: electrical

Audible indication

Ultrasonic pest control

340405, G08B 300

Patent

active

040400506

ABSTRACT:
An emergency vehicle audible warning system having a control circuit with a means for switching said control circuit to activate a tone generator for creating a yelp tone or a wail tone. A siren amplifier interfaces a siren speaker and the yelp and wail tone generators. A series of switches are also provided in operative connection with the horn ring of an automobile or a foot switch, so that the yelp or wail tone can be effectuated thereby, upon the demand of the driver of the emergency vehicle. The change from the yelp or wail tone can be provided by either a change in capacitance, or a change in the resistance within the tone generating circuit. In addition thereto, an extended yelp tone is provided by means of a timing circuit or increased time delay function to maintain a yelp tone or another desired tone for an extended period of time after either the horn switch, foot switch, or other appropriate switch has been momentarily activated and then released.

REFERENCES:
patent: 3693110 (1972-09-01), Briggs, Jr. et al.
patent: 3747092 (1973-07-01), Smith
patent: 3868684 (1975-02-01), Nunn, Jr.
patent: 3873980 (1975-03-01), Carroll
patent: 3889256 (1975-06-01), Cieslak et al.

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