Data encoding method and system employing two-thirds code rate w

Details Data encoding method and system employing two-thirds code rate w Data encoding method and system employing two-thirds code rate w

1980-02-19

1982-06-29

Miller, Charles D.

Communications: electrical

Audible indication

Percussion-type sound producer

360 40, H03K 1324

Patent

active

043374581

ABSTRACT:
A method and apparatus for encoding binary data in a data stream so as to increase the number of data bits represented by one transition, such as a transition recorded on a magnetic medium, and thereby increase the storage density. The data stream is converted into words each having m bits. Two of the data words are stored so as to be simultaneously accessible to a converting system that converts the data words into code words wherein each code word has n bits. In the invention, m
=2/3. In order to increase the space between adjacent transitions, the conversion is carried out according to a scheme wherein all code words have at least one binary ONE and lack successive binary ONEs except certain cases in which a code word is converted to all ZEROs to avoid ONEs in the nth bit of a given code word and the first bit of the code word following the given code word. Also described is a decoding method and apparatus for recovering the encoded data and decoding it to the original binary data.

REFERENCES:
patent: 3374475 (1968-03-01), Gabor
patent: 3564557 (1971-02-01), Ruthazer
patent: 3906485 (1975-09-01), Hong
Takasaki, "IEEE Trans. on Communications", vol. COM-24, No. 4, Apr. 1976, pp. 404-413.
Gabor, "IEEE Trans. on Electronic Computers", Dec. 1967, pp. 866-868.
Horiguchi, "IEEE Trans. on Magnetics", vol. MAG-12, No. 6, Nov. 1976, pp. 740-742.

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