Dynamic information storage or retrieval – Binary pulse train information signal – Binary signal gain processing
Patent
1998-01-26
2000-09-12
Tran, Thang V.
Dynamic information storage or retrieval
Binary pulse train information signal
Binary signal gain processing
369 47, 369 48, 369124, G11B 700
Patent
active
061187453
ABSTRACT:
Disclosed is a digital edge processor frequency control for estimating the center frequency of a recorded signal having a known format, such as data recorded on a CLV optical disk or on magnetic tape. The read channel includes a sampling detector which samples the recorded signal at a known rate to provide edge position signals (PAT) indicating the location of recorded pulse edges. An edge pattern identifier detects whether the edge signals of the recording signal match a predetermined element of the known format. Examples of predetermined elements include a pulse of a known length and whose edges are spaced a known distance, a predetermined pulse pattern, or a pulse or pattern at a known location. An interval counter is coupled to the pattern identifier for measuring the interval length between the edges of the matching pulse or pattern in units of the sample length. A center frequency estimator calculates the period of the center frequency of the matching edges by relating the matching edge interval length to a predetermined nominal wave length for the predetermined element of the known format. The result is a Tau that is used to establish the center frequency for the digital PLL.
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Hutchins Robert Allen
Jaquette Glen Alan
Tsuruta Kazuhiro
Holcombe John H.
International Business Machines - Corporation
Sullivan Robert M.
Tran Thang V.
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