Sparton Corporation

Melburn J Baxter

A vehicle horn is disclosed with an electronic switching circuit which operates at a switching frequency equal to the resonant frequency of the horn. A sweep frequency oscillator generates a switching pulse train. A transducer and signal conditioner produces a horn output pulse train at a frequency equal to the acoustic output of the horn. The horn output pulse train is applied to one input of a phase comparator. The output of the sweep frequency oscillator is applied to the other input of the phase comparator. The phase comparator generates a stop signal for the sweep frequency oscillator when the input signals are in phase with each other which signifies that the horn is operating at its resonant frequency.

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Deland, FL, United States of America

Melburn J Baxter