Method and apparatus for adaptive DC level control

Details Method and apparatus for adaptive DC level control Method and apparatus for adaptive DC level control

2007-03-13

2007-03-13

Harold, Jefferey F. (Department: 2614)

Telephonic communications

Subscriber line or transmission line interface

Power supply

C379S399010, C379S395010

Reexamination Certificate

active

09751421

ABSTRACT:
A method and apparatus is provided for DC level control in a line card. The method includes receiving a digital input signal, determining a first DC component value of the digital input signal at a first preselected time, and determining a second DC component value of the digital input signal at a second preselected time. The method further includes determining a difference between the first DC component value and the second DC component value. The method includes providing the first DC component value to a digital-to-analog converter in response to determining that the difference is less than a first preselected value. The apparatus includes a digital-to-analog converter and logic. The logic is coupled to the digital-to-analog converter, wherein the logic is capable of receiving a digital input signal, determining a first DC component value of the digital input signal at a first preselected time, and determining a second DC component value of the digital input signal at a second preselected time. The logic is farther capable of determining a difference between the first DC component value and the second DC component value, and providing the first DC component value to the digital-to-analog converter in response to determining that the difference is less than a first preselected value.

REFERENCES:
patent: 6671373 (2003-12-01), Pang et al.
patent: 6735302 (2004-05-01), Caine et al.
patent: 6922470 (2005-07-01), Betty et al.

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