Information detecting device having circuit capable of providing

Details Information detecting device having circuit capable of providing Information detecting device having circuit capable of providing

1997-09-08

1999-06-29

Hindi, Nabil

Dynamic information storage or retrieval

Binary pulse train information signal

Binary signal gain processing

G11B 700

Patent

active

059177942

ABSTRACT:
An information detecting device comprises a multiplier for multiplying a gain g by a reproduced digital signal reproduced out of an optical recording medium to produce a multiplication result. A maximum likelihood detector is for use in carrying out, in response to the multiplication result, pulsing operation according to the multiplication result to produce a pulse string. A replica generator is for use in producing, in response to the pulse string, a replica waveform having an ideal channel property out of the pulse string. A delay circuit is for use in producing, in response to the reproduced digital signal, a delayed signal having the same phase as the replica waveform. An amplitude fluctuation amount detector detects, in response to the replica waveform and the delayed signal, a fluctuation amount of the amplitude of the reproduced digital signal by means of comparing the replica waveform with the delayed signal and supplies a signal designating the gain g to the multiplier in accordance with a detected fluctuation amount.

REFERENCES:
patent: 5598392 (1994-08-01), Izumi et al.
patent: 5604724 (1995-09-01), Shiokawa
patent: 5680380 (1994-09-01), Taguchi et al.
patent: 5684773 (1996-03-01), Hayashi
Andrew J. Viterbi, "Convolutional Codes and Their Performance in Communication Systems", IEEE Transactions on Communications Technology, vol. COM-19, No. 5, Oct. 1971, pp. 751-772.

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