Cordless telephone

Details Cordless telephone Cordless telephone

1989-03-22

1990-12-18

NG, Jin F.

Telephonic communications

Audio message storage, retrieval, or synthesis

379 62, H04Q 704

Patent

active

049792059

ABSTRACT:
A cordless telephone includes a base unit connected to a telephone network line and a handset unit having a rechargeable battery for its operating power supply. The handset unit and the base unit are connected through a communication channel by radio waves during a telephone communication. An identification code is transmitted from one of the units to the other prior to a communication between the two units. The identification code transmitted by one unit is examined in the other unit, and a communication channel is established between the two units only when the transmitted identification code is determined be correct. The handset has a first recharge detecting circuit for detecting a recharge of the rechargeable battery and a first memory for storing the identification code, and the base unit has a recharging circuit for recharging the rechargeable battery, a second recharge detecting circuit for detecting a recharge of the rechargeable battery by the recharging circuit, and a second memory for storing the identification code. When the first recharge detecting circuit detects a recharge of the rechargeable battery, the identification code stored in the second memory is extracted through recharging contacts of the handset unit and the base unit, and the identification code thus extracted is recorded in the first memory.

REFERENCES:
patent: 4656653 (1987-04-01), Oda et al.
patent: 4700375 (1987-10-01), Reed
patent: 4893155 (1986-06-01), Hawkins

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