Cordless telephone

Details Cordless telephone Cordless telephone

1995-12-01

1998-08-11

Bost, Dwayne D.

Telecommunications

Transmitter and receiver at separate stations

Plural transmitters or receivers

455426, 455462, 455555, 375354, H04Q 720

Patent

active

057941521

ABSTRACT:
A cordless telephone consisting of base and handset units is disclosed wherein a control circuit incorporated in the base unit comprises first and second D/A converters, first and second A/D converters, and first and second sync. signal generation circuits. The first and second D/A converters respectively convert digital signals from the handset unit and a PBX. The first and second A/D converters convert the analog signals provided from the first and second D/A converters to transmit them to the PBX and handset unit, respectively. The first sync. signal generation circuit regenerates a first clock signal synchronously with a sync. signal provided from the PBX to render the first A/D and second D/A converters to operate in synchronism with the sync. signal from the PBX. The second sync. signal generation circuit generates a second clock signal which is independent of the sync. signal from the PBX to render the first D/A and second A/D converters to operate in synchronism with the second clock signal. Accordingly, the synchronization between the base and handset units is effected independently of the synchronization signal from the PBX.

REFERENCES:
patent: 4612594 (1986-09-01), Yamaura et al.
patent: 4823362 (1989-04-01), Etoh
patent: 5241688 (1993-08-01), Arora
patent: 5519759 (1996-05-01), Heineck et al.
patent: 5528597 (1996-06-01), Gerszberg et al.
patent: 5602843 (1997-02-01), Gray
patent: 5722080 (1998-02-01), Kondo
patent: 5732356 (1998-03-01), Bolt

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