Radio paging system with voice transfer function and radio pager

Details Radio paging system with voice transfer function and radio pager Radio paging system with voice transfer function and radio pager

1993-01-15

1995-05-02

Swann, Tod R.

Cryptography

Cryptanalysis

380 49, 380 50, 34082544, H04K 100

Patent

active

054127190

ABSTRACT:
A radio paging system with voice transfer function for transmitting a voice message input from an ordinary push-button telephone set to a small-sized receive-only unsophisticated radio pager. A paging station is provided to transmit by radio the message from a telephone network to the radio pager as follows: voice information constituting the message is first converted from analog to digital format, compressed, stored in memory, and scrambled by a privacy function part for transmission. The radio pager in turn demodulates the received information, stores it in memory, retrieves a necessary message therefrom as designated, descrambles the designated message from scrambled state, expands the message from compressed state, and outputs the message as an audible output. In this manner, the user carrying the radio pager is able to get the message from the caller without the risk of being tapped by a third party.

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patent: 5285496 (1994-02-01), Frank et al.
patent: 5309154 (1994-05-01), Mun et al.

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