Accession Number : AD0864830

Title :   Entropy of Information Fields and Effects of Communications Errors on Legibility. Part A. Theory and Methodology.

Descriptive Note : Research rept. Jul 68-Jul 69,

Corporate Author : NAVAL ELECTRONICS LAB CENTER SAN DIEGO CA

Personal Author(s) : Nolde, G. V.

Report Date : 06 NOV 1969

Pagination or Media Count : 28

Abstract : The work determines percentage of messages rendered nonintelligible as a function of character-error rate for general radio telegraph channels. Formulas are derived and their results confirmed by existing records. It is seen that for English text the influence of errors is different in man-to-man communications as compared to automatically utilized phrases--as, for example, in computer-to-computer instructions. For other information fields this property varies with usage. It is also of interest that it is not the loss of separate words due to errors, but the distortions of certain 'characters of essential entropy' which render a message nonintelligible. (Author)

Descriptors :   *INFORMATION THEORY), (*TELEGRAPH SIGNALS, ENTROPY, ERRORS, TELETYPE SYSTEMS.

Subject Categories : Cybernetics

Distribution Statement : APPROVED FOR PUBLIC RELEASE