Coding apparatus for converting digital signals into ternary sig

Details Coding apparatus for converting digital signals into ternary sig Coding apparatus for converting digital signals into ternary sig

1990-07-26

1992-07-14

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

General processing of a digital signal

In specific code or form

375 18, G11B 509, H04B 162

Patent

active

051308622

ABSTRACT:
By transforming a duobinary signal, a value of -1 cannot appear again after a value of zero following -1 as shown in a string of -1.fwdarw.0.fwdarw.-1 and a value of 1 cannot appear again after a value of zero following 1 as shown in a string of 1.fwdarw.0.fwdarw.1. Narrow-band transmission is made possible by the fact that the direct current (DC) component of a duobinary signal can be eliminated and reproducible original information can be recorded by discriminating its even level as a one (1) and its odd level as zero (0). Since the DC component can be eliminated, electromagnetic conversion systems are subjected to less distortion, leading to a reduction in the probability of coding errors.

REFERENCES:
patent: 4584690 (1986-04-01), Cafiero et al.
IEEE Transactions on Communications, vol. 35, No. 2, Feb. 1987, New York, NY, US; K. Y. Kim et al.; "Run-length limited variants of duobinary and modified duobinary", pp. 142-150.
Patent Abstracts of Japan, vol. 6, No. 115 (E-115) [993], Jun. 26, 1982; & JP-A-57 42 249 (Nippon Denshin Denwa Kosha) Sep. 3, 1982.
Journal of the Institution of Electronic and Radio Engineers, vol. 56, No. 4, Apr. 1986, pp. 159-168, London, GB; F. C. Court: "Minimum bandwidth dicode signalling".
Attach. A-"Principles of Data Communication"; R. W. Lucky et al., Bell Telephone Laboratories, Inc. McGraw-Hill Book Co., pp. 80-92 and pp. 219-221.
Attach. B-"Data Transmission", William R. Bennett et al., McGraw-Hill Book Co., pp. 26-29; 120-127; 132-133.

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