Telephone line interface circuit and method

Details Telephone line interface circuit and method Telephone line interface circuit and method

2006-05-23

2006-05-23

Tieu, Binh K. (Department: 2643)

Telephonic communications

Subscriber line or transmission line interface

Hybrid circuit

C379S391000, C379S399010

Reexamination Certificate

active

07050574

ABSTRACT:
A hybrid circuit is disclosed for effectively communicating information over a telecommunications line to which a transmitter and receiver are connected. The hybrid circuit is configured as a filter for filtering at the receiver input signals at predetermined frequencies appearing on the transmitter output and the telecommunications line. The filter circuit additionally forms a capacitive divider for scaling signals appearing at the transmitter output and canceling the scaled signals at the receiver input with related signals appearing on the telecommunications line. In one embodiment of the present invention for communicating using the ADSL protocol, the filter circuit is a first order high pass filter.

REFERENCES:
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patent: 5541990 (1996-07-01), Rahamim
patent: 5734703 (1998-03-01), Hiyochi
patent: 5822426 (1998-10-01), Rasmus et al.
patent: 6538986 (2003-03-01), Isaksson et al.
patent: 0 739 120 (1996-10-01), None
European Search Report, EP 00 30 8181, dated Dec. 4, 2003.

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