Echo prevention circuit, filter coefficient setting method,...

Details Echo prevention circuit, filter coefficient setting method,... Echo prevention circuit, filter coefficient setting method,...

2008-07-15

2008-07-15

JeanPierre, Peguy (Department: 2819)

Coded data generation or conversion

Analog to digital conversion followed by digital to analog...

C370S289000

Reexamination Certificate

active

07400278

ABSTRACT:
An echo prevention circuit includes a filter that receives a first digital signal and outputs second and third digital signals; first and second DA converter that convert the second and third digital signals into first and second analog signals respectively; a circuit to subtract the second analog signal from a signal generated by combining the first analog signal and a third analog signal, a circuit to amplify the signal from the subtracting circuit; an AD converter that converts the amplified signal into a digital signal; a responsive signal acquiring unit to acquire a first response signal from the input of the first DA converter to the output of the AD converter and to acquire a second response signal from the input of the second DA converter to the output of the AD converter; and a unit to set filter coefficients based on the first and second response signals.

REFERENCES:
patent: 4602133 (1986-07-01), O'Neill
patent: 6480532 (2002-11-01), Vareljian
patent: 6658055 (2003-12-01), Darr
patent: 6674810 (2004-01-01), Cheng
patent: 6771771 (2004-08-01), Moon et al.
patent: 7173962 (2007-02-01), Dowling
patent: 2001-060895 (2001-03-01), None

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