Improved magneto-optical recording apparatus for digital signal

Details Improved magneto-optical recording apparatus for digital signal Improved magneto-optical recording apparatus for digital signal

1994-09-20

1996-01-30

Neyzari, Ali

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

369 47, G11B 1100

Patent

active

054885914

ABSTRACT:
A magneto-optical recording apparatus capable of maintaining decoding performance even if the recording density at the magneto-optical recording is high. The magneto-optical recording apparatus comprises a modulator for RLL (Run-Length Limited) encoding recording data, an NRZI encoder for NRZI-encoding a RLL code from the modulator, an equalizer for equalizing a read-out analog signal obtained from a magneto-optical recording medium into a waveform (1+D).sup.n (n is a positive integer) assuming that the delay time for one bit period of the read-out signal is D, a low pass filter, and a Viterbi decoder that uses the difference between a sample value obtained by quantizing an output from the low pass filter and an expected value obtained from a theoretical value of a data column to make the most probable path to be decoding data.

REFERENCES:
patent: 5070492 (1991-12-01), Ogawa et al.
patent: 5189650 (1993-02-01), Watanabe et al.
patent: 5311493 (1994-05-01), Fuji
patent: 5363352 (1994-11-01), Tobita et al.
Faculty of Engineering, Ehime University, Japan, vol. 44, No. 10, pp. 1369-1375 (1990) "Applications of New Variable-Length Block Code and Viterbi Decoding Using d-constraint to Magneto-Optical Recording"; Hisashi Osawa, Kenji Yamauchi, and Saburo Tazaki.

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