Wire-bound telecommunication device and a circuit for use in...

Details Wire-bound telecommunication device and a circuit for use in... Wire-bound telecommunication device and a circuit for use in...

2005-08-02

2005-08-02

Mei, Xu (Department: 2644)

Telephonic communications

Supervisory or control line signaling

Signal receiver

C379S380000, C379S142080, C379S215010, C375S317000, C375S334000, C327S031000, C327S100000

Reexamination Certificate

active

06925170

ABSTRACT:
In known telephone subscriber end stations a caller_ID IC detects a tone alerting signal TAS alerting that successive caller_ID information can be received for displaying on a display of the phone. The known station applies narrow frequency band filters to detect tones indicating the end of TAS. Such a detection is not flexible as it can only be used for a specific caller_ID signal protocol.A flexible detector is proposed which can easily be adapted to widely varying protocols and which can also be used for other purposes such as the detection of power drops in an FSK signal. The detector comprises means for determining a time-domain signal representing the signal energy of a signal on the subscriber line in a predetermined time interval.

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