VEHICLE APPROACH WARNING APPARATUS
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United States of America Patent
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Issued Date -
Jul 19, 2012
app pub date -
Jan 5, 2012
filing date -
Jan 18, 2011
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A vehicle (approach) warning apparatus generates a warning sound that is emitted from a parametric speaker and a vehicle horn, by driving the vehicle horn with a rectangular wave signal of 0 volts or more, thereby preventing a power loss due to a counter electromotive force that is caused by an alternation of a plus electric voltage and a minus electric voltage in the horn as well as preventing a problematic distortion of the warning sound from the horn. Further, since the vehicle (approach) warning apparatus is devised to prevent the parametric speaker from generating a low pitch sound of 500 Hz that is reproduced by the horn, an influence of a higher harmonic wave upon a reproduced sound from the parametric speaker is reduced, thereby preventing deterioration of a sound from the parametric speaker.
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