Burns, Doane, Swecker & Mathis, L.L.P.
Signal detection method of data recording/reproducing apparatus and device therefor
 A signal detection device and method of a data recording/reproducing apparatus. The signal detection device of a data recording/reproducing apparatus for recording/reproducing a digital signal U.sub.k having an arbitrary integer time k as an index, includes: an analog-to-digital converter (ADC) for converting an analog signal from which external band noise is removed after being reproduced from the data recording/reproducing apparatus, into a digital signal; a filter for modifying the digital signal converted by the analog-to-digital converter (ADC) into a signal having a predetermined spectral shape; and a Viterbi detector for detecting the spectrum signal modified by the filter as the data recorded in the data recording/reproducing apparatus. Therefore, after equalizing a signal into a spectrum expressed by 2+D+D.sup.2 +D.sup.3, which is similar to the spectrum of an optical recording/reproducing apparatus, the maximum likelihood (ML) is detected by the Viterbi detector. Accordingly, noise scarcely increases and loss by intersymbol interference is overcome, so that the signal can be detected with reliability. 
Samsung Electronics Co., Ltd.
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H03M G11B H03M G11B H03M H04L H03M G11B
inventional inventional inventional additional inventional inventional inventional inventional
Yung-soo Seong-jin Ji-yong
Kim Kim Jun