Dynamic magnetic information storage or retrieval – General processing of a digital signal – Data clocking
Patent
1998-02-20
2000-04-25
Kim, W. Chris
Dynamic magnetic information storage or retrieval
General processing of a digital signal
Data clocking
360 65, G11B 509, G11B 5035
Patent
active
060551194
ABSTRACT:
A method and circuit in a digital recording/reproducing apparatus are provided for adaptively processing symbol timing recovery and equalization for an input signal including known signal sequence. The adaptive signal processing method includes the steps of sampling the input signal according to a sampling clock and outputting sampled data, detecting whether the sampled data is a known signal sequence and detecting a track mode from the detected known signal sequence according to a predetermined track pattern. The sampled data is equalized according to a predetermined equalization coefficient to generate equalized data. The equalization coefficient is renewed using an error between a prestored reference signal according to the track pattern and the equalized data. Next, the sampling clock for compensating for the error is generated during the remaining known signal sequence period directly after the track mode is detected, the equalization coefficient is renewed using an error between determined data and the equalized data, and the sampling clock is generated for compensating for the error during a period except the known signal sequence period. Therefore, adaptive signal processing such as timing recovery or equalization is performed using the known signal sequence like an ITI sector, thereby improving the performance of the digital recording/reproducing apparatus.
REFERENCES:
Gardner, Floyd M., "Interpolation in Digital Modems--Part 1: Fundamentals", IEEE Transactions on Communications, vol. 41, No. 3, Mar. 1993, pp. 501-507.
Kim W. Chris
Samsung Electronics Co,. Ltd.
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