Wireless telephone with frequency inversion scrambling

Details Wireless telephone with frequency inversion scrambling Wireless telephone with frequency inversion scrambling

1991-09-06

1992-12-01

Cangialosi, Salvatore

Cryptography

Communication system using cryptography

Frequency shift or inversion

H04K 100

Patent

active

051685221

ABSTRACT:
The wireless telephone of the present invention is comprised of a base unit, coupled to a land-line telephone system, and a remote unit that communicates with the base unit over radio frequencies. The remote unit has scrambling circuits (207 and 216) for encrypting voice signals transmitted to the base unit and decrypting voice signals received from the base unit. The base unit also has scrambling circuits (107 and 116) for encrypting voice signals transmitted to the remote unit and decrypting voice signals received from the remote unit. The wireless telephone uses a keypad (222) for initiating a demonstration mode that allows both parties to the conversation to hear the scrambled voice signal.

REFERENCES:
patent: 4228321 (1980-10-01), Flanagan
patent: 4411017 (1983-10-01), Talbot
patent: 4555805 (1985-11-01), Talbot
patent: 4827507 (1989-05-01), Marry et al.
patent: 4920567 (1990-04-01), Malek
patent: 4972479 (1990-10-01), Tobias, Jr. et al.
patent: 4989230 (1991-01-01), Gillig
patent: 5140635 (1992-08-01), Houghton et al.
Popular Science Magazine, Jun. 1991, "What's New", p. 17.

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