Digital cordless telephone set operated under burst synchronizat

Details Digital cordless telephone set operated under burst synchronizat Digital cordless telephone set operated under burst synchronizat

1993-11-30

1995-07-18

Kurtz, Curtis

Telephonic communications

Audio message storage, retrieval, or synthesis

379 58, 379 63, 3701054, H04Q 722, H04M 1100

Patent

active

054349052

ABSTRACT:
A cordless telephone set comprises a base unit and a handset unit connected by a radio frequency (RF) link which is established by digital burst data transmission and is synchronized by a unique word which is included in the digital burst data. The radio transmission signal is not continuous and it requires the synchronization. The unique word is detected by the unique word detecting means and is used to establish the burst data synchronization. The unite word consists of frequency channel information and fixed unite data. By using this information, the base unit and the handset unit are prevented from trying to establish a radio link at incorrect frequency when a spurious signal, not intended for the base unit and/or handset unit is erroneously received.

REFERENCES:
patent: 4903257 (1990-02-01), Takeda et al.
patent: 5020130 (1991-05-01), Grube et al.
patent: 5297203 (1994-03-01), Rose et al.
patent: 5319634 (1994-06-01), Bartholomew et al.

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