Transmitter for wireless audible indication system

Details Transmitter for wireless audible indication system Transmitter for wireless audible indication system

1996-10-09

1998-05-26

Hofsass, Jeffery

Coded data generation or conversion

Code generator or transmitter

341176, 3403841, 340539, 34082569, 3403847, G08C 1912

Patent

active

057573050

ABSTRACT:
A wireless audible indication system comprising a transmitter and a receiver. An embodiment of the transmitter includes a crystal oscillator which produces a signal having a predetermined audio frequency. A duty cycle limiting circuit limits the duty cycle of the oscillator signal to be less than 25%. The limited duty cycle signal is applied to a radio frequency oscillator to produce an amplitude modulated radio frequency signal. An embodiment of the receiver includes a superregenerative detector which provides wide band detection of transmissions about a carrier frequency. A signal processing circuit formed by a cascade of a crystal filter stage, an amplifier/comparator stage, and a detector stage, processes the signal from the superregenerative detector. A sound generator integrated circuit, which generates an audible signal indicative of reception of a transmitted signal, is coupled to the signal processing circuit. Another embodiment of the receiver includes two parallel signal processing paths having different crystal filter stages, which allows use with two different transmitters.

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Pamphlet by Dimango Products-- Dimango's 1993 Wireless Chime Program.

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