Secure cordless radio-telephone

Details Secure cordless radio-telephone Secure cordless radio-telephone

1991-06-03

1994-04-26

Gregory, Bernarr E.

Pulse or digital communications

Repeaters

Testing

380 6, 380 9, 380 34, 380 46, 380 49, 379 61, H04L 2730, H04M 1100

Patent

active

053073703

ABSTRACT:
A frequency-hopping cordless telephone system is described which adds digitized audio to a pseudorandom frequency hopping pattern for voice encryption. The randomly selected start point of a very long pseudoramic pattern generator is transferred to the handset by way of an infrared path at each off-hook. In addition, the infrared path is used to synchronize the clocks of the handset and the associated base module when the cordless telephone is in an on-hook position.

REFERENCES:
patent: 4560832 (1985-12-01), Bond et al.
patent: 4654481 (1987-03-01), Corris et al.
patent: 4727568 (1988-02-01), Morishima
patent: 4829540 (1989-05-01), Waggener, Sr. et al.
patent: 4905272 (1990-02-01), Van de Mortel et al.
patent: 5073932 (1991-12-01), Yossifor et al.
patent: 5077790 (1991-12-01), D'Amico et al.
patent: 5115463 (1992-05-01), Moldavsky et al.

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