ELECTRONIC VEHICLE HORN

摘要

An electronic vehicle horn outputs a warning sound by exciting a diaphragm using a piezoelectric device that is driven with a composite signal generated, in part, by modulating a first fundamental square wave with a first modulating square wave and setting a frequency deviation at the time of the modulation in a predetermined range, modulating a second fundamental square wave with a second modulating square wave and setting a frequency deviation at the time of the modulation in a predetermined range, and generating the composite signal by mixing the modulated first fundamental square wave and the modulated second fundamental square wave.

主权项

1. An electronic vehicle horn that outputs a warning sound by exciting a diaphragm using a piezoelectric device, the electronic vehicle horn comprising:
means for generating a first fundamental square wave for a higher-pitched sound; means for generating a second fundamental square wave for a lower-pitched sound; means for generating a first modulating square wave; means for generating a second modulating square wave; means for modulating the first fundamental square wave with the first modulating square wave and for setting a first frequency deviation at the time of the modulation to generate a modulated first fundamental square wave; means for modulating the second fundamental square wave with the second modulating square wave and for setting a second frequency deviation at the time of the modulation to generate a modulated second fundamental square wave; and means for generating a composite signal and for driving the piezoelectric device with the composite signal, the composite signal resulting from mixing the modulated first fundamental square wave and the modulated second fundamental square wave, wherein each of the fundamental square waves are within a first frequency range, each of the modulating square waves are within a second frequency range and the frequency deviations, relative to the frequencies of the fundamental square waves, are within a decibel range such that the warning sound output by the piezoelectric device driven with the composite signal is similar to a tone quality of a warning sound that is output from an electromagnetic horn.