Pulse or digital communications – Synchronizers – Synchronizing the sampling time of digital data
Reexamination Certificate
2007-12-11
2007-12-11
Ha, Dac V. (Department: 2611)
Pulse or digital communications
Synchronizers
Synchronizing the sampling time of digital data
C375S229000, C375S341000, C369S047180, C369S017000, C369S047350, C369S059220, C360S065000
Reexamination Certificate
active
11691518
ABSTRACT:
A read channel apparatus is disclosed for reading data recorded on an optical storage system at a predetermined baud rate. The apparatus asynchronously samples an analog read signal generating from the optical storage system and subtracts an estimated DC offset from the asynchronous sample values to generate a sequence of asynchronous DC-removed sample values. The asynchronous DC-removed sample values are separately interpolated by two interpolators to generate a sequence of synchronous even-time sample values and a sequence of synchronous odd-time sample values respectively. The synchronous even-time and odd-time sample values are separately equalized by two equalizers in accordance with a target spectrum to generate a sequence of even-time equalized sample values and a sequence of odd-time equalized sample values respectively. A DC offset estimator generates the estimated DC offset from the even-time equalized sample values and the odd-time equalized sample values. The interpolators are under the control of a timing recovery controller for synchronizing the even-time and odd-time sample values to the baud rate. In the preferred embodiment, the recorded data are determined from the even-time equalized sample values and the odd-time equalized sample values.
REFERENCES:
patent: 5400364 (1995-03-01), Yada
patent: 5802118 (1998-09-01), Bliss et al.
patent: 6282248 (2001-08-01), Farrow et al.
patent: 6418101 (2002-07-01), Finkelstein
patent: 6674707 (2004-01-01), Ogura et al.
patent: 7170703 (2007-01-01), Egan
patent: 2003/0030930 (2003-02-01), Sugawara et al.
Gardener, Floyd, IEEE Transactions on Communications, vol. 41, No. 3, Mar. 1993, 501-507.
Erup, Lars, IEEE Transactions on Communications, vol. 41, No. 6, Jun. 1993, 998-1008.
Huang Ke-Chiang
Wang Tzu-Pai
Ha Dac V.
Mediatek Inc.
Thomas Kayden Horstemeyer & Risley
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