Directional back-up alarm
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United States of America Patent
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Dec 9, 2008
Grant Date -
N/A
app pub date -
Aug 31, 2006
filing date -
Aug 31, 2005
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A directional back-up alarm deployed in a vehicle moving in an open space, in accordance with one embodiment of the present invention includes, in part, a first ultrasonic generator adapted to generate a first ultrasound signal; a second ultrasonic generator adapted to generate a second ultrasound signal; an audible sound generator adapted to generate an audible signal; a modulator adapted to modulate the first ultrasonic signal with the audible signal to generate a modulated signal; and a summing circuit adapted to receive and sum the modulated signal with the second ultrasonic signal to generate a combined signal. The combined signal is transmitted with a transmit antenna. The transmit antenna may include a Piezoelectric or silicon device.
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