Apparatus and method for forming d.c. free codes

Details Apparatus and method for forming d.c. free codes Apparatus and method for forming d.c. free codes

1982-09-28

1985-10-15

Griffin, Robert L.

Pulse or digital communications

Repeaters

Testing

340347DD, 360 45, H03K 1302

Patent

active

045478902

ABSTRACT:
A method and apparatus for the elimination of any net d.c. component from the transmission of binary sequential data in a run length limited code where the encoding set has less than the number of code values required to provide one-to-one mapping from source data to an encoded set satisfying preselected constraints. The past and current parity and charge of the encoded words are employed as parameters in the method to determine encoding schemes satisfying criteria such as run length limit.

REFERENCES:
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patent: 3905029 (1975-09-01), McIntosh
patent: 3906485 (1975-09-01), Hong et al.
patent: 3995264 (1976-11-01), Ouchi
patent: 4027335 (1977-05-01), Miller
patent: 4234897 (1980-11-01), Miller
Lodewijk et al., "The Compact Disc Digital Audio System" the 67th Convention 1980, Oct. 31/Nov. 3, N.Y. Audio Eng. Society Reprint.
Dol "General Information on a Compact Digital Audio Disk" Audio Eng. Society vol. 29, No. 1/2 1981, Jan./Feb. pp. 9-12.
A. M. Patel, "Zero-Modulation Encoding in Magnetic Recording", Jul. 4, 1975, IBM J. Res. Develop., vol. 19, No. 4, pp. 366-378.
S. J. Hong et al., "Codes for Self-Clocking, AC-coupled Transmission Aspects of Synthesis and Analysis", Jul. 4, 1975, IBM J. Res. Develop., vol. 19, No. 4, pp. 358-365.
C. E. Shannon, "A Mathematical Theory of Communication", Jul. 1948, The Bell System Technical Journal, vol. XXVII, No. 3, pp. 379-423.
A. M. Patel, "Charge-Constrained Byte-Oriented (d,k) Code", IBM Technical Disclosure Bulletin, vol. 19, No. 7, (Dec. 1976).

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