Multi-tone back-up alarm
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United States of America Patent
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Issued Date -
Jun 28, 2007
app pub date -
Dec 22, 2005
filing date -
Dec 22, 2005
priority date (Note) -
Abandoned
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Abstract
A multi-tone vehicle motion alarm is provided as an augmentation of a single-tone alarm by imbedding in the alarm sound a plurality band-limited single-tone acoustic signals of different frequencies that are emitted in pulsed synchronism so that the warning signal is emitted in a form that allows directionality of the source to be determined by those around the alarmed equipment. This functional extension preserves many of the familiar aspects of existing alarms. Further, limiting the frequency band of the alarm reduces useless noise in the worksite. The preferred embodiment emits a pulsating tone alarm consisting of two discrete and identifiable monotones. The alarm is an extension of widely recognized pulsating reverse warning sounds. Additional tones may be employed to aid in the speed with which the sound source can be located with human hearing.
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