Method and apparatus for automatic alignment of notch filters

Details Method and apparatus for automatic alignment of notch filters Method and apparatus for automatic alignment of notch filters

2005-08-31

2010-06-15

Fan, Chieh M (Department: 2611)

Pulse or digital communications

Receivers

Interference or noise reduction

C375S148000, C375S285000, C375S144000, C375S346000, C333S175000, C333S176000, C333S167000, C333S170000, C333S171000, C381S071110, C381S093000, C381S094100, C455S063100, C455S067130

Reexamination Certificate

active

07738610

ABSTRACT:
A method and apparatus are provided for automatic alignment of a notch filter in a receiver. The method comprises the steps of determining a frequency of an interfering signal, monitoring an energy in the interfering signal, tuning the notch filter based on an initial tune value, detecting an energy content in the radio signal after the tuning step, incrementally tuning the notch filter away from the initial tune value while monitoring the energy in the interfering signal, repeating the step of detecting and the step of incrementally tuning until the energy in the interfering signal is minimized, and storing a new tune value as the initial tune value. The notch filter is configured to filter the radio signal. The new tune value indicates a minimized energy in the interfering signal.

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European Patent Office, “European Search Report”, Feb. 4, 2008, Published in: EP.

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