Digital modulation apparatus, a digital modulation method, and a

Details Digital modulation apparatus, a digital modulation method, and a Digital modulation apparatus, a digital modulation method, and a

1996-12-11

1999-06-29

Chin, Stephen

Pulse or digital communications

Pulse code modulation

Length coding

3582611, 341 59, H04B 1404, H03M 700

Patent

active

059178574

ABSTRACT:
A digital modulation apparatus applies a method for converting data words to runlength-limited code words using plural conversion tables. The data words are converted to code words that significantly suppress the low frequency component of the final nonreturn-to-zero inverted signal.
This digital modulation apparatus includes ROM tables for storing plural conversion tables containing the runlength-limited code words corresponding to the data words; end-runlength memories and evaluators for determining whether the runlength-limit constraints are satisfied in the interconnection between two consecutive code words when the data words to be converted are supplied; and a DSV controller for storing each of the code words that can be selected from two conversion tables to buffer memories when the runlength-limit constraints are satisfied, and selecting the code words wit the greatest effect suppressing the low frequency component in the obtained signal when the code words are NRZI converted.

REFERENCES:
patent: 4520346 (1985-05-01), Shimada
patent: 4728929 (1988-03-01), Tanaka
patent: 4988999 (1991-01-01), Uehara et al.
patent: 5196848 (1993-03-01), Sakazaki
patent: 5469162 (1995-11-01), Chaki et al.
Copy of a International Search Report issued Apr. 14, 1997.
S. Kotaori et al.: "Channel Coding Scheme for 3/4 Inch HDTV Digital VCR" (Signal Processing of HDTV, IV, Proceedings of the International Workshop on HDTV '92, Kawasaki, Japan, Nov. 18-20, 1992, ISBN 0-444081551-1, 1993, Amsterdam, Elsevier, pp. 253-260/Database Inspec. Institute of Electrical Engineers, Stevenage, GB, Inspection No. 4630995. XP000670637).
S. Kitaori et al.: Channel Coding Scheme for 3/4 Inch HDTV Digital VCR (Signal Processing: Image Communication, Dec. 1993, Netherlands, Vol. 5, No. 5-6, ISSN 0923-5965, pp. 425-430, XP000426714).
K.A.S. Immink, "EFMplus: The Coding Format of the Multimedia Compact Disc" (IEEE Transactions on Consumer Electronics, Aug. 1995, U.S.A., vol. 41, No. 3, ISSN 0098-3063, pp. 491-497, XP000539497).
An article by Kees A. Schouhamer Immink, entitled "EFMPlus: The Coding Format of the High-Density Compact Disc", published on pp. 80-81 of the IEEE (May, 1995).

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