Emergency alarm device
First Claim
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1. A transmitter-receiver emergency signalling device, the transmitter of which may be carried on the person, comprising:
- (a) means for generating a system address pulse train of a fixed number of pulses, the width of each pulse being determined by whether or not the pulse represents a "one" or a "zero;
"(b) means for setting the pulse width of the pulses in the pulse train and thereby determining the system address;
(c) radio frequency transmission means the carrier signal of which is modulated by the pulse train;
(d) a radio frequency receiver means responsive to the transmitted signal;
(e) means for determing that each of the fixed number of pulses in the pulse train have been received;
(f) address decoding means adapted to receive the pulse train and compare an address received with the system address; and
(g) an alarm responsive to a comparison of the received address and the system address.
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Abstract
A portable and addressable emergency alarm device which transmits a selected radio frequency alarm signal from a portable transmitter to a stationary receiver and sounds an alarm.
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Citations
1 Claim
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1. A transmitter-receiver emergency signalling device, the transmitter of which may be carried on the person, comprising:
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(a) means for generating a system address pulse train of a fixed number of pulses, the width of each pulse being determined by whether or not the pulse represents a "one" or a "zero;
"(b) means for setting the pulse width of the pulses in the pulse train and thereby determining the system address; (c) radio frequency transmission means the carrier signal of which is modulated by the pulse train; (d) a radio frequency receiver means responsive to the transmitted signal; (e) means for determing that each of the fixed number of pulses in the pulse train have been received; (f) address decoding means adapted to receive the pulse train and compare an address received with the system address; and (g) an alarm responsive to a comparison of the received address and the system address.
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Specification
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Current AssigneeRes'Q Incorporated
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Original AssigneeRes'Q Incorporated
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InventorsMiller, Fay H., Palmer, Ray W.
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Primary Examiner(s)Waring, Alvin H.
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Application NumberUS05/761,068Time in Patent Office718 DaysField of Search340/213.1, 340/224, 340/348, 340/349, 340/412, 340/416, 340/167 A, 340/409, 325/38 R, 325/39, 325/16, 325/142, 325/143, 325/364, 325/55, 325/37US Class Current340/539.11CPC Class CodesG08B 21/04 responsive to non-activity,...G08B 25/10 using wireless transmission...
