Radio-telephone system employing a manner of changing a channel

Details Radio-telephone system employing a manner of changing a channel Radio-telephone system employing a manner of changing a channel

1991-07-22

1993-04-06

Eisenzopf, Reinhard J.

Telecommunications

Transmitter and receiver at same station

With a common signal processing stage

4551851, 4551861, H04B 138

Patent

active

052010660

ABSTRACT:
A radio-telephone system employing a manner of changing a channel and a privacy digital code and interstoring them between by wireless and a method of changing the privacy digital code. The radio-telephone system comprises a stationary apparatus 100 and a portable apparatus 200. The stationary apparatus 100 includes a base MPU 410 containing a ROM, a charging power supply and sensing circuit 450, a transmitting and receiving PLL circuit 420, a duplex radio transmitting and receiving unit 430, a line connecting circuit 460 and an antenna A. The portable apparatus 200 includes a hand MPU 610 containing a RAM, a transmitting and receiving PLL circuit 620, a duplex radio transmitting and receiving unit 630, a charging circuit 680 and an antenna A'. The method of changing the privacy digital code is performed by using the radio-telephone system. Therefore, in accordance with the present invention, the selection of the talk channel having no crosstalk by the system software is enabled. In addition, first in confirmation of a identification code in decision of the talk channel, a misconnection between the stationary and portable apparatus in the course of a talker's talking over the telephone can be prevented.

REFERENCES:
patent: 4403344 (1983-09-01), Yamada et al.
patent: 4593155 (1986-06-01), Hawkins
patent: 5012234 (1991-04-01), Dulaney et al.

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