System and method for processing an input signal...

Details System and method for processing an input signal... System and method for processing an input signal...

2005-02-15

2005-02-15

Isen, Forester W. (Department: 2644)

Telephonic communications

Supervisory or control line signaling

Signal reception at substation

C379S093010, C379S130000, C370S488000, C370S497000

Reexamination Certificate

active

06856682

ABSTRACT:
In one embodiment, a system is provided for processing an input signal communicated on a telephone line, the input signal including a first component associated with a first frequency band, a second component associated with a second frequency band higher than the first frequency band, and a third component associated with a third frequency band higher than the second frequency band. The system includes a first filter to receive the input signal and to pass a first signal substantially comprising the second component, a second filter to receive the input signal and to pass a second signal substantially comprising the first and third components, and a third filter to receive the second signal and to pass a third signal substantially comprising the first component according to an input capacitance of a fourth filter that limits the ability of the third filter to pass the second component.

REFERENCES:
patent: 5345437 (1994-09-01), Ogawa
patent: 5367540 (1994-11-01), Kakuishi et al.
patent: 5781617 (1998-07-01), McHale et al.
patent: 5880649 (1999-03-01), Tai et al.
patent: 5982785 (1999-11-01), Woerner et al.
patent: 2430698 (1980-03-01), None

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