Encoding with economical codebook memory utilization

Details Encoding with economical codebook memory utilization Encoding with economical codebook memory utilization

1999-05-07

2000-10-31

Young, Brian

Coded data generation or conversion

Digital code to digital code converters

Coding by table look-up techniques

H03M 742

Patent

active

061409472

ABSTRACT:
In an encoding method which utilizes plural codebooks, certain bits of a user data input sequence are considered as branch selection bit(s) which determine (1) how the remainder of the input sequence is to be divided into plural subsequences and (2) which codebooks are addressed using the plural subsequences in order to generate corresponding plural output sequences. The plural output sequences are then concatentated together to form a codeword. The method reduces the size of the codebooks that otherwise would be employed for the particular code involved in the encoding method. The encoding of the present invention is particularly suitable for a Quadbit Modulo 2 (QM2) code.

REFERENCES:
patent: 5061924 (1991-10-01), Mailhot
patent: 5408234 (1995-04-01), Chu
patent: 5608397 (1997-03-01), Soljanin
Soljanin et al, "Decoding Techniques For Some Specially Constructed DC-Free Codes", 1997 IEEE International Conference on Communications, vol. 3, Jun. 8-12, 1997, pp. 1633-1637.
Fitzpatrick et al, "Time Varying MTR Codes for High Density Magnetic Recording", Proceedings Globecom '97, Nov. 1997 [Phoenix, AZ].

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