Cordless telephone

Details Cordless telephone Cordless telephone

1998-07-21

1999-06-22

Chin, Wellington

Telecommunications

Transmitter and receiver at same station

Radiotelephone equipment detail

455462, 455555, H04Q 726

Patent

active

059152273

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: 5233644 (1993-08-01), Yamagata et al.
patent: 5241688 (1993-08-01), Arora
patent: 5515420 (1996-05-01), Urasaka et al.
patent: 5519759 (1996-05-01), Heineck et al.
patent: 5528597 (1996-06-01), Gerszberg et al.
patent: 5581595 (1996-12-01), Iwashita et al.
patent: 5602843 (1997-02-01), Gray
patent: 5722080 (1998-02-01), Kondo
patent: 5732356 (1998-03-01), Bolt

Affiliated with

Also associated with

Rating

Cordless telephone does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Cordless telephone, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Cordless telephone will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1715629