Self-tuning vehicle horn

Details Self-tuning vehicle horn Self-tuning vehicle horn

1992-04-21

1995-05-09

Swarthout, Brent

Communications: electrical

Audible indication

Diaphragm

116142R, 3403841, 381 96, G08B 300

Patent

active

054144060

ABSTRACT:
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.

REFERENCES:
patent: 2860183 (1958-11-01), Conrad
patent: 3009991 (1961-11-01), Bekey
patent: 3743868 (1973-07-01), Kawada
patent: 3967143 (1976-06-01), Watanabe et al.
patent: 4001817 (1977-01-01), Squires
patent: 4195284 (1980-03-01), Hampshire et al.
patent: 4361952 (1982-12-01), Neese
patent: 4389638 (1983-06-01), Gontowski, Jr.
patent: 4393373 (1983-07-01), Torii et al.
patent: 4813123 (1989-03-01), Wilson et al.
patent: 5049853 (1991-09-01), Yoon
patent: 5109212 (1992-04-01), Cortinovis et al.
patent: 5181019 (1993-01-01), Gottlieb et al.

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