Mobile perimeter monitoring system
First Claim
1. A mobile perimeter monitoring system comprising:
- (a) a mobile transmitter having a predetermined transmitting range for transmitting a data signal;
(b) a receiver including an alarm circuit for providing an alarm signal; and
(c) mode switch means associated with said receiver for placing said receiver in a monitoring mode wherein an alarm signal will be provided only whenever said mobile transmitter moves beyond said predetermined range, and in a tracking mode wherein an alarm signal will be provided only when said mobile transmitter moves within said predetermined range.
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Accused Products
Abstract
A mobile perimeter monitoring system includes a battery powder transmitter adapted to be placed upon the person to be monitored while the system user carries a receiver. The receiver responds to a code transmitted by the transmitter and provides an in-range or out-of-range indication depending upon whether the receiver is within the effective range of the transmitter or outside of its effective range. An adjustment on the receiver allows the user to adjust the effective range of the system for varying environments. The receiver may be operated in an in-range mode or an out-of-range mode to provide both perimeter monitoring capability and the ability to track a transmitter if its moves outside the perimeter.
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Citations
6 Claims
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1. A mobile perimeter monitoring system comprising:
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(a) a mobile transmitter having a predetermined transmitting range for transmitting a data signal; (b) a receiver including an alarm circuit for providing an alarm signal; and (c) mode switch means associated with said receiver for placing said receiver in a monitoring mode wherein an alarm signal will be provided only whenever said mobile transmitter moves beyond said predetermined range, and in a tracking mode wherein an alarm signal will be provided only when said mobile transmitter moves within said predetermined range. - View Dependent Claims (2, 3, 4, 5)
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6. A mobile perimeter monitoring system comprising:
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(a) a mobile transmitter having a predetermined transmitting range for transmitting data signals at a predetermined duty cycle; (b) a receiver including an alarm circuit for providing an alarm signal in response to said data signals, said receiver having timing means for maintaining said alarm circuit in a first condition in response to said data signals; (c) switch means located on said transmitter for altering the duty cycle at which said data signals are transmitted, whereby said alarm circuit will be maintained by said timing means in a second condition in response to said data signals; and (d) mode switch means for placing said receiver in a monitoring mode wherein said alarm signal will be provided only whenever said mobile transmitter moves beyond said predetermined transmitting range and in a tracking mode wherein said alarm signal will be provided only when said mobile transmitter moves within said predetermined transmitting range.
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Specification