Audible electronic warning system

Details Audible electronic warning system Audible electronic warning system

1976-03-08

1978-02-21

Pitts, Harold I.

Communications: electrical

Audible indication

Ultrasonic pest control

340384R, G08B 300

Patent

active

040756254

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 the vehicle, or controlled by an operator, or dependent on other circuitry in the unit, or random. The present circuit has for its purpose to combine, superimpose, add, mix, or multiply, various signals from audio sweep oscillators in the circuitry including a plurality of such oscillators with the outputs thereof combined particularly by mixing means which includes multiplexing and simultaneous mixing as well.

REFERENCES:
patent: 3493966 (1970-02-01), Human
patent: 3504364 (1970-03-01), Abel

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