Analogue echo filter

Details Analogue echo filter Analogue echo filter

2005-09-20

2005-09-20

Vo, Don N. (Department: 2631)

Pulse or digital communications

Transceivers

Modems

C375S257000, C370S286000, C379S406010

Reexamination Certificate

active

06947478

ABSTRACT:
The invention relates to an analog echo filter for a modem, to which an analog transmit signal is supplied. According to the invention, a passive analog input filter and an active analog filter, whose transfer function is adjustable, are provided. The transfer function of the active analog filter can preferably be switched between a first-order transfer function and a second-order transfer function.

REFERENCES:
patent: 4608464 (1986-08-01), Morikawa et al.
patent: 4635255 (1987-01-01), Clark et al.
patent: 4796296 (1989-01-01), Amada et al.
patent: 0 798 876 (1997-10-01), None

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