Short range induction field communication system

Details Short range induction field communication system Short range induction field communication system

1976-10-20

1977-12-06

Safourek, Benedict V.

325 22, 325 57, 325144, 325187, 179 82, H04B 138

Patent

active

040619729

ABSTRACT:
A short range communication or signalling system uses induction field FM or PCM capture effect properties to transfer information to receivers located outside the aerial configuration of the transmitter. When used as a deaf aid, the receiver is equipped with a conventional hearing aid for use when the transmitter is silent. Switching of the transmitter and receiver from one mode to another is achieved manually or using a VOX system. Adjustable sensors of field strength may be provided in the receiver (a) to inhibit transmission when a nearby transmitter is already operating and (b) to reduce the effective range of the receiver.

REFERENCES:
patent: 2312824 (1943-03-01), Kroger
patent: 2515663 (1950-07-01), O'Brien
patent: 2774873 (1956-12-01), Rieke
patent: 3043916 (1962-07-01), Sneath
patent: 3191066 (1965-06-01), Staudenmayer
patent: 3469192 (1969-09-01), Tomono
patent: 3808539 (1974-08-01), Martin
patent: 3814856 (1974-06-01), Dugan

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