Title:
ENCODING AND DECODING METHOD FOR MULTIVALUE RECORDING
Document Type and Number:
Japanese Patent JP3854331
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To reduce the delay in the timing which generates an external field and the load on the magnetic coil in a magnetooptic recording system executed under application of an external magnetic field.
SOLUTION: The method is used to record multivalued information in accordance with the intensity of the external magnetic field applied to a recording medium. In a transition from a multivalued code at the time just before the transition to the multivalued code at a time t, the multivalued code at the time t is uniquely determined by the binary code to be inputted to the encoder and the multivalued code at the time t-1 immediately before, and encoding is executed under the transition rule in which such transition alone that the absolute difference value between the multivalue code at the time t-1 and that at the time t is '0' or '1' is allowed. Viterbi decoding can be applied at the time of decoding.
Inventors:
Imai Shou
Masashi Yoshihiro
Masashi Yoshihiro
Application Number:
JP2044596A
Publication Date:
December 06, 2006
Filing Date:
January 11, 1996
Export Citation:
Assignee:
Hitachi Maxell Co., Ltd.
International Classes:
G11B20/10; G11B20/14; G11B11/10; G11B11/105; G11B20/18; H03M5/20; H03M13/00; (IPC1-7): G11B11/10; G11B20/10; H03M13/00
Domestic Patent References:
| JP6124549A | ||||
| JP6282943A | ||||
| JP6076390A | ||||
| JP4355233A | ||||
| JP3005932A |
Attorney, Agent or Firm:
Kijuro Kawakita
Atsushi Tateishi
Atsushi Tateishi
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