Pulse or digital communications – Receivers – Interference or noise reduction
Reexamination Certificate
2008-03-11
2008-03-11
Phu, Phuong (Department: 2611)
Pulse or digital communications
Receivers
Interference or noise reduction
C375S229000, C708S301000, C708S323000, C708S322000
Reexamination Certificate
active
07342983
ABSTRACT:
A digital filtering apparatus and method for digitally filtering out undesirable or invalid data from data signal lines. The digital filtering apparatus includes a digital delay element having one or more outputs, a comparator connected to the outputs of the digital delay element, and a final stage connected to the output of the comparator and the outputs of the digital delay element. The digital filtering apparatus recognizes and filters out invalid data from data received by the digital delay element, and allows valid data to pass through the filter. Data is considered invalid data if its logical data state transition has a duration less than the clock setting of the digital filtering apparatus. The clock setting can be established by the number of active delay components in the digital delay element. The inventive digital filtering apparatus represents an improvement over conventional analog filters, e.g., in manufacturing efficiency and filtering performance.
REFERENCES:
patent: 3829798 (1974-08-01), Byram et al.
patent: 5457718 (1995-10-01), Anderson et al.
patent: 6064704 (2000-05-01), Liu et al.
patent: 2005/0105507 (2005-05-01), Clements et al.
Agere Systems Inc.
Phu Phuong
Santos Daniel J.
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