Method of coding data bits on a recording medium, arrangement fo

Details Method of coding data bits on a recording medium, arrangement fo Method of coding data bits on a recording medium, arrangement fo

1980-08-18

1983-10-18

Sloyan, T. J.

Communications: electrical

Audible indication

Percussion-type sound producer

360 40, 360 44, 369 59, H03K 1302, G11B 509

Patent

active

044108770

ABSTRACT:
"Method of coding data bits on a recording medium, arrangement for putting the method into effect and recording medium having an information structure."
The so-called Miller modulation has the disadvantage that a direct current is generated in the information channel. When this modulation method is used for magnetical or optical recording, the result is that the amplitude values and the zero crossings are deformed as these channels cannot transmit direct current.
According to the invention, in order to obtain, a d.c. free modulation, the Miller modulation concept is modified such that sequences of data bits which, after coding, result in the introduction of a d.c. component are coded differently. It appears that, the frequency zero excepted, a good suppression of the response is obtained also in a fairly wide low-frequency portion of the spectrum.
The invention further relates to an arrangement for putting the method into effect and to a recording medium, for example an optical disc, having an information structure which is coded by means of the d.c.-free coding.

REFERENCES:
patent: 4027335 (1977-05-01), Miller
patent: 4032979 (1977-06-01), Rice
patent: 4183066 (1980-01-01), Anderson
patent: 4233626 (1980-11-01), Bell
patent: 4234897 (1980-11-01), Miller
Mallinson et al., Optimal Codes for Digital Magnetic Recording, The Radio and Electronic Engineer, vol. 47, No. 4, 4/1977, pp. 172/176.

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