Unit for preventing an interception of a radio communication sig

Details Unit for preventing an interception of a radio communication sig Unit for preventing an interception of a radio communication sig

1986-02-14

1988-02-23

Lev, Robert

Telephonic communications

Having light wave or ultrasonic link for speech or paging...

Including fiber optic link within telephone network

379 56, 379 63, 380 6, H01Q 704

Patent

active

047275685

ABSTRACT:
In a radio frequency communication system in which a radio frequency communication signal is transmitted between a radio terminal (14) and a mobile station (24), it may be that an unauthorized third person uses a scanner-receiver (60) to intercept the communication signal. In order to prevent such an interception, the unit comprises a detecting circuit (30) for detecting an internal signal which is transmitted between a telephone exchange (12) and the radio terminal (14) and is concerned with an ordinary voice signal. The detection circuit produces a detection signal when the internal signal is absent. Responsive to the detection signal, a control circuit (32) controls the internal signal to prevent the interception, as by sending a dummy voice signal whenever the ordinary voice signal is absent. Alternatively, the control circuit may produce a control signal while the communication signal is received from the mobile station and consequently while the internal signal is sent form the radio terminal to the exchange. In this event, the control signal is used either in attenuating or switching off an echo signal which usually results from the internal signal reaching the exchange.

REFERENCES:
patent: 4241236 (1980-12-01), Nash
patent: 4450319 (1984-05-01), Lucey
patent: 4517561 (1985-05-01), Burke et al.
patent: 4543665 (1985-09-01), Soteld et al.
patent: 4555592 (1985-11-01), Deinzer

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