Article: California Inventors Develop Digital Automatic Gain Control System

ALEXANDRIA, Va., Aug. 22 -- David C. Lee and Judith C. Powelson, both of Alameda, Calif., Steven R. Spielman of Oakland, Calif., Yung-Cheng Lo of San Leandro, Calif., have developed a method of encoding multilevel signal.

An abstract of the invention, released by the U.S. Patent & Trademark Office, said: "A system and method are disclosed for providing a gain control signal for a multilevel read signal. In one embodiment, maximum automatic gain control marks are periodically inserted amongst a series of data fields. The automatic gain control marks include a series of high level marks such that the maximum signal detected in the interior portion of each maximum automatic gain control ...

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