Communications: electrical – Condition responsive indicating system – With particular coupling link
Patent
1994-07-29
1997-10-21
Hofsass, Jeffery
Communications: electrical
Condition responsive indicating system
With particular coupling link
34082569, 34082572, 34082563, 341176, 455139, G08B 108
Patent
active
056801025
ABSTRACT:
A wireless audible indication system comprising a transmitter and a receiver. An embodiment of the transmitter includes a modulator formed by a microprocessor and a radio frequency oscillator. The modulation format employed is selectable by the user using severable jumper wires. A battery status circuit is included which verifies the status of a battery within the transmitter. The modulator transmits a low battery bit to the receiver in order to alert the user of a weak transmitter battery. An embodiment of the receiver includes a superregenerative detector which produces an intermediate signal upon receiving a radio frequency signal. A signal processing circuit, which includes an active peak detector stage and a discrete comparator stage, is used to process the intermediate signal. A microprocessor controls a sound generator circuit in response to the processed intermediate signal. The microprocessor, which normally operates in an inactive mode, is awaken using a wake-up circuit upon reception of the radio frequency signal. A battery status circuit is included to verify the status of a battery within the receiver. Embodiments of the transmitter and receiver employ a pulse position modulation scheme.
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Fasco Industries Wireless Chime Program, Mar. 15, 1993.
Pamphlet by Dimango Products--Dimango's 1993 Wireless Chime Program.
Dimango Products
Hofsass Jeffery
Pope Daryl C.
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