Industrial control for audible electronic warning system

Details Industrial control for audible electronic warning system Industrial control for audible electronic warning system

1975-02-18

1976-09-14

Pitts, Harold I.

Communications: electrical

Audible indication

Ultrasonic pest control

340384R, G08B 300

Patent

active

039810070

ABSTRACT:
This invention is an electronic siren producing a siren sound having a sound wave produced on a slowly rising and falling frequency. A major cycle is pulsed at intervals with variations in frequency. The variations in each major cycle represent minor cycles. The invention utilizes an electronic circuit to effect such major and minor frequency cycles with existing speaker equipment to project the sound. The electronic circuit includes one or more complex variable rate pulse oscillators wherein the variability of the oscillator is flexible so that it can be programmed internally, or controlled by the speed of a vehicle, or controlled by an operator, or dependent on other circuitry in the unit, or random.

REFERENCES:
patent: 3889256 (1975-06-01), Cieslak

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