Telephone system comprising a base station and at least one...

Details Telephone system comprising a base station and at least one... Telephone system comprising a base station and at least one...

1998-09-22

2001-01-23

Eisenzopf, Reinhard J. (Department: 2745)

Telecommunications

Radiotelephone system

C455S462000

Reexamination Certificate

active

06178321

ABSTRACT:

FIELD OF THE INVENTION
The invention relates to a telephone system comprising a base station and at least one handset, for permitting the exchange of call signals, the system having:
means for transmitting signal frames superposed on call signals between the base station and the handset,
means for cutting off the call signals during the reception of the signal frames.
The invention also relates to a method of cutting off the call signals during the signal frames, to a handset and to a base station suitable for such a system.
BACKGROUND OF THE INVENTION
Such systems are well known and the invention more particularly relates to cordless telephony devices known by the name of CT
0
, CT
1
, . . . , CTx.
One of the problems posed with this type of system is due to the necessity of periodically verifying whether the handset and the base station are validly interconnected. For this purpose, an identification code is transmitted in a signal frame. This transmission of a frame is superposed on the call signals which is highly annoying to the listeners. There is also proposed to reduce the perception of call signals during the transmission of these signal frames. However, as a result of the drift of the circuits, it is not always possible to ensure the simultaneity of the reception of the frames with the cutting off of the call signals and this calls forth an annoying effect for the user, because these frames carry unpleasant noise when listening.
SUMMARY OF THE INVENTION
The present invention proposes a system of the kind defined in the opening paragraph which permits of ensuring this simultaneity of these frame signals and the cutting off.
Therefore, such a system is characterized in that there are provided:
a differential circuit for measuring the time interval between the cutting off of the call signals and the reception of said signal frame, and
a correction circuit for modifying the appearance of said cutting off as a function of said difference.


REFERENCES:
patent: 4663765 (1987-05-01), Stuphin et al.
patent: 4689812 (1987-08-01), Hata
patent: 5151922 (1992-09-01), Weis
patent: 5553077 (1996-09-01), Martinez Garcia et al.
patent: 6055416 (2000-04-01), Hachimura

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