Pulse or digital communications – Equalizers – Automatic
Patent
1997-02-19
1999-11-30
Chin, Stephen
Pulse or digital communications
Equalizers
Automatic
375341, 371 436, H03K 5159, H04L 2706, G06F 1110
Patent
active
059955457
ABSTRACT:
The present invention relates to a signal reproducing method and a signal reproducing apparatus for reproducing a signal recorded by a high-density recording. The invention avoids deteriorating the performance of an ML detector while suppressing the equalization loss and the correlation noise. The signal reproducing method includes steps of generating a first signal using a first selected number of convolutions, generating a second signal using a second selected number of convolutions, and combining the first and second signals to identify the information in the input signal. The first and second signals can be processed by adding or subtracting the first and second signals, depending on the circuit configuration. With this invention, the number of convolution steps is reduced, and it is possible to reduce equalization loss and correlation noise using circuits having a small circuit scale. When applied to a disk drive, it is possible to improve reliability, reduce circuit scale and reduce the size and weight of the drive. It is also possible to obtain a high-density recording due to the reduced error rate realized by this invention.
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patent: 5136593 (1992-08-01), Moon et al.
patent: 5550810 (1996-08-01), Monogioudis et al.
patent: 5561687 (1996-10-01), Turner
Chin Stephen
Fujitsu Limited
Park Albert
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