Radiocommunications equipment with a security calls mode, and extension unit forming part of such equipment
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Apr 18, 2000
Grant Date -
N/A
app pub date -
Jul 7, 1997
filing date -
Jul 9, 1996
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The equipment comprises a radio terminal adapted to calls with a public mobile telephony network supporting voice transmission channels and data channels, and an extension unit which can be connected to a data interface of the terminal and allowing calls on the data channels of the network. This extension unit comprises a microphone, an earphone, a vocoder and a ciphering module. It has the same external appearance as a conventional mobile radio terminal. In a security call mode, the signal coming from the microphone of the extension unit is processed by the vocoder and then by the ciphering module in order to produce data sent to the data interface of the terminal, and the data received from the data interface of the terminal are processed by the ciphering module and by the vocoder in order to control the earphone of the extension unit.
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