Vehicle presence alert apparatus
First Claim
1. A vehicle presence alert apparatus for alerting a target object, which is movable relative to a vehicle, to a presence of the vehicle via an audible alert sound with a frequency in an audible range, the vehicle presence alert apparatus comprising:
- a sound emitter that causes a carrier wave with a frequency in an ultrasonic range to carry the alert sound with a frequency in an audible range, and that emits the ultrasonic carrier wave carrying the audible frequency alert sound as an air pressure radiation wave toward the target object;
an air pressure wave receiver that receives a reflected air pressure wave generated by reflection of the radiation wave from the target object; and
a controller that calculates a relative velocity of the target object with respect to the vehicle based on a frequency of the emitted radiation wave and a frequency of the reflected wave.
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Accused Products
Abstract
A vehicle presence alert apparatus for alerting a target object to a presence of the vehicle via an alert sound with a frequency in an audible range is disclosed. The vehicle presence alert apparatus includes: a sound emitter configured to (i) cause a carrier wave with a frequency in an ultrasonic range to carry the alert sound, and (ii) emit the carrier wave carrying the alert sound as a radiation wave toward the target object; a sound receiver configured to receive a reflected wave, the reflected wave being generated due to reflection of the radiation wave by the target object; and relative velocity calculation means for calculating a relative velocity of the target object with respect to the vehicle based on a frequency of the radiation wave and a frequency of the reflected wave.
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Citations
6 Claims
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1. A vehicle presence alert apparatus for alerting a target object, which is movable relative to a vehicle, to a presence of the vehicle via an audible alert sound with a frequency in an audible range, the vehicle presence alert apparatus comprising:
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a sound emitter that causes a carrier wave with a frequency in an ultrasonic range to carry the alert sound with a frequency in an audible range, and that emits the ultrasonic carrier wave carrying the audible frequency alert sound as an air pressure radiation wave toward the target object; an air pressure wave receiver that receives a reflected air pressure wave generated by reflection of the radiation wave from the target object; and a controller that calculates a relative velocity of the target object with respect to the vehicle based on a frequency of the emitted radiation wave and a frequency of the reflected wave. - View Dependent Claims (2, 3, 4)
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5. A vehicle presence alert apparatus for alerting a target object, which is movable relative to a vehicle, to a presence of the vehicle via an alert sound with a frequency in an audible range, the vehicle presence alert apparatus comprising:
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a sound emitter that causes a carrier wave with a frequency in an ultrasonic range to carry the alert sound, and that emits the carrier wave carrying the alert sound as a radiation wave toward the target object; a sound receiver that receives a reflected wave generated from reflection the radiation wave by the target object; and a controller that calculates a relative velocity of the target object with respect to the vehicle based on a frequency of the radiation wave and a frequency of the reflected wave wherein when regularly stopping emission of the radiation wave, the controller lengthens and shortens a period of stop of the emission of the radiation wave in accordance with the relative velocity. - View Dependent Claims (6)
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Specification