Correction and Control of Information in the Memory Device of a Supervisory-Control System,
Abstract
Applicability of the '2 out of 5' code to supervisory-control systems, which detect all single and double errors and correct single errors, is considered. Representation of m decimal digits of a word in the '2 out of 5' code, with 5 check tags per word, is examined. The '2 out of 5' code has near-minimal redundancy and permits detecting and correcting errors with less equipment than the Hamming code; the latter requires particularly complicated parity check. It is found that: the use of the '2 out of 5' code in supervisory-control systems with an elementwise parity check permits obtaining a very high transmission fidelity because all single and double and 98 percent higher-multiple errors can be detected; storing and transmitting information in this code is very reliable: all single and 70 percent double errors are corrected; the checking and correcting circuits in this code do not require much equipment, and hence may be recommended for complex information systems.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 12, 1970
- Accession Number
- AD0714769
Entities
People
- N. Ya. Damaskinskaya
- V. B. Marakhovskii
- V. N. Alekseev
Organizations
- National Air and Space Intelligence Center