Pulse or digital communications – Equalizers
Reexamination Certificate
2007-05-01
2007-05-01
Ha, Dac V. (Department: 2611)
Pulse or digital communications
Equalizers
C375S340000, C375S350000, C375S355000, C369S047180, C369S047290, C369S047350, C369S059220, C360S065000
Reexamination Certificate
active
11126991
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.
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Huang Ke-Chiang
Wang Tzu-Pai
Ha Dac V.
Mediatek Inc.
Thomas Kayden Horstemeyer & Risley
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