Dynamic magnetic information storage or retrieval – General processing of a digital signal – Head amplifier circuit
Patent
1995-01-27
1997-04-29
Psitos, Aristotelis
Dynamic magnetic information storage or retrieval
General processing of a digital signal
Head amplifier circuit
360 51, 360 65, 375341, 375290, G11B 509, G11B 5035
Patent
active
056255055
ABSTRACT:
Disclosed are a partial-response record signal regenerating method of and an apparatus for regenerating a record signal of a data area which is read from a storage disc by use of an equalizing circuit after training a circuit constant of said equalizing circuit with a training signal of the record signal read from the storage disc. The record signal regenerating method comprises: a Viterbi decode step of Viterbi-decoding an output into which the record signal is equalized by the equalizing circuit; a decode step of converting an m-bit output which is Viterbi-decoded into n-bits (m>n); and a synchronism detecting step of detecting the training signal from the m-bit output which is Viterbi-decoded and indicating a start of decoding the record signal of the data area. The record signal regenerating apparatus comprises: an equalizing circuit for equalizing the record signal by use of its circuit constant trained by a training signal recorded in front of a data area on the storage disc; a Viterbi decode circuit for Viterbi-decoding an output of the equalizing circuit; a decoder for converting an m-bit output which is Viterbi-decoded into n-bits (m>n); and a synchronism detecting circuit for indicating a start of decoding of the decoder by detecting the training signal from the Viterbi-decoded m-bit output.
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Hashimoto Shuichi
Ohmori Hideki
Fujitsu Limited
Neal Regina Y.
Psitos Aristotelis
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