| US 7,573,966 B2 | ||
| Adaptive noise filtering and equalization for optimal high speed multilevel signal decoding | ||
| Andrew Joo Kim, Atlanta, Ga. (US); Vincent Mark Hietala, Albuquerque, N. Mex. (US); and Sanjay Bajekal, Marietta, Ga. (US) | ||
| Assigned to Quellan, Inc., Atlanta, Ga. (US) | ||
| Filed on Feb. 21, 2006, as Appl. No. 11/358,901. | ||
| Application 11/358901 is a continuation of application No. 10/620477, filed on Jul. 15, 2003, granted, now 7,035,361. | ||
| Prior Publication US 2006/0239390 A1, Oct. 26, 2006 | ||
| Int. Cl. H04B 1/10 (2006.01) | ||
| U.S. Cl. 375—350 [375/348; 375/349] | 10 Claims |
| 1. A system for processing digital signals comprising symbols propagated according to a period, the system comprising:
a signal conditioning filter comprising:
a first stage for mitigating degradations of the digital signals that occur according to a first time scale, the first stage
comprising a first analog filter tuned to the first time scale, the first time scale comprising a fraction of the period at
which the symbols are propagated, and
a second stage for removing signal distortions that occur according to a second time scale, the second stage comprising a
second analog filter tuned to the second time scale, the second time scale being different than the first time scale and comprising
a magnitude at least equal to the period at which the symbols are propagated; and
a signal integrity unit coupled to an output of the second stage, the signal integrity unit comprising a third analog filter
stage for producing an analog probability estimate, the signal integrity unit analyzing the analog probability estimate and
adjusting the first and second time scales based on the analysis of the analog probability estimate.
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