Child position monitoring and locating device
First Claim
1. A location monitoring device for alerting a user when a locating transmitter which transmits a carrier having a predetermined frequency with a predetermined signal strength is located outside a predetermined proximity radius from said location monitoring device, wherein said location monitoring device displays the relative location of the transmitter once outside the predetermined proximity radius, the location monitoring device comprising:
- a compact portable outer housing having a front side and a back side;
a display having a plurality of light generators located around a center of said display on said front side of said outer housing;
carrier reception means for detecting said carrier propagating in a given linear direction from said locating transmitter to said location monitoring device;
direction detecting means for determining a propagation angle as measured between said given linear direction as detected by said carrier reception means and a reference linear direction;
signal strength detection means for determining the signal strength of said carrier detected by said carrier reception means;
threshold detection means for generating an alert signal whenever said signal strength as determined by said signal strength detection means drops below a predetermined signal strength threshold value, thereby indicating that said locating transmitter is located outside of said predetermined proximity radius;
alert signal indication means responsive to said alert signal for indicating to the user that said locating transmitter is outside of said predetermined proximity radius;
a display driver having an input for receiving display digital control signals for controlling said display driver to activate at least one of said plurality of light generators;
an emblem located at said center of said display with said plurality of lights located around said emblem at equal angular distances from each other when measured from any one of said plurality of light generators to said emblem and then to another successive one of said plurality of light generators and wherein said reference linear direction is defined by that direction from said emblem to a first light generator of said plurality of light generators; and
,a controller having a first display controller means for supplying said display driver with said display digital control signals so as to activate one of said plurality of light generators in response to the reception of said alert signal,wherein said one of said plurality of light generators defines a locating linear direction when measured from said emblem to said one of said plurality of light generators and wherein a locating angular direction defined by the angle between said reference linear direction and said locating linear direction is substantially equal to said propagation angle within a given predetermined tolerance.
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Accused Products
Abstract
A child position monitoring device monitors the position of a child by detecting the signal strength of a radio frequency carrier from a transmitter attached to the child. If the signal of the radio frequency carrier is to weak, the child is to far away from the adult who has the child position monitoring device. When this happens, the adult is informed that the child has wandered to far away through the use on an audio tone or through the use of vibrations coming from the device. Once the adult is notified that the child is too far away, the device also has a locating display for indicating the relative direction of the child with respect to the adult. The display uses eight LEDs arranged around an emblem used to represent the position of the adult. The LED which lights up indicates the relative direction of the child.
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Citations
14 Claims
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1. A location monitoring device for alerting a user when a locating transmitter which transmits a carrier having a predetermined frequency with a predetermined signal strength is located outside a predetermined proximity radius from said location monitoring device, wherein said location monitoring device displays the relative location of the transmitter once outside the predetermined proximity radius, the location monitoring device comprising:
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a compact portable outer housing having a front side and a back side; a display having a plurality of light generators located around a center of said display on said front side of said outer housing; carrier reception means for detecting said carrier propagating in a given linear direction from said locating transmitter to said location monitoring device; direction detecting means for determining a propagation angle as measured between said given linear direction as detected by said carrier reception means and a reference linear direction; signal strength detection means for determining the signal strength of said carrier detected by said carrier reception means; threshold detection means for generating an alert signal whenever said signal strength as determined by said signal strength detection means drops below a predetermined signal strength threshold value, thereby indicating that said locating transmitter is located outside of said predetermined proximity radius; alert signal indication means responsive to said alert signal for indicating to the user that said locating transmitter is outside of said predetermined proximity radius; a display driver having an input for receiving display digital control signals for controlling said display driver to activate at least one of said plurality of light generators; an emblem located at said center of said display with said plurality of lights located around said emblem at equal angular distances from each other when measured from any one of said plurality of light generators to said emblem and then to another successive one of said plurality of light generators and wherein said reference linear direction is defined by that direction from said emblem to a first light generator of said plurality of light generators; and
,a controller having a first display controller means for supplying said display driver with said display digital control signals so as to activate one of said plurality of light generators in response to the reception of said alert signal, wherein said one of said plurality of light generators defines a locating linear direction when measured from said emblem to said one of said plurality of light generators and wherein a locating angular direction defined by the angle between said reference linear direction and said locating linear direction is substantially equal to said propagation angle within a given predetermined tolerance. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification