Radio telephone proximity detector

Details Radio telephone proximity detector Radio telephone proximity detector

1997-10-22

2000-11-28

Eisenzopf, Reinhard J.

Telecommunications

Transmitter and receiver at same station

Radiotelephone equipment detail

455575, 455462, 455 88, H04B 138

Patent

active

061546658

ABSTRACT:
A radiotelephone proximity detector, comprising a first proximity unit associated with a radiotelephone and a second proximity unit associated with a user wherein the second proximity unit includes a transmitter for transmitting a proximity signal, and the first proximity unit includes a receiver for receiving the proximity signal and an analysis unit for estimating the proximity of the first and second proximity units on the basis of the received proximity signal, the first proximity unit being operable when the estimated proximity of the first and second proximity units exceeds a threshold to cause the radiotelephone to change into an operating mode in which its normal use is prevented.

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WPI Abstracts Accession No. 95-352005/46 & CN 1095532A (YANG), Nov. 23, 1994.

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