Telephonic communications – Subscriber line or transmission line interface – Power supply
Reexamination Certificate
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.
Harold Jefferey F.
Legerity Inc.
Williams Morgan & Amerson P.C.
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