Accession Number : ADA138947

Title :   Preliminary Analysis of Automatic Morse Code Transcribers for Use in U.S. Coast Guard Operations.

Descriptive Note : Final rept.,

Corporate Author : SPEECH COMMUNICATIONS RESEARCH LAB LOS ANGELES CA

Personal Author(s) : Merriam,E W

PDF Url : ADA138947

Report Date : Jan 1984

Pagination or Media Count : 1984

Abstract : Coast Guard operations were analyzed to review day-to-day procedures, determine the type of Morse code information received, the quality and speed range of received code, traffic loads, experience level of Coast Guard operators, and other factors that may influence the usefulness of an automated transcription system. The technical aspects of the received signals are also reviewed as to strength of signals, fading, bandwidth, frequency range, quality, etc. Fifteen commercially available transcribers and the techniques of three research projects are reviewed. While all of these contribute useful techniques, it is found that none is adequate to support the Coast Guard requirements. However, a combination of these and other techniques hold promise if a development effort is undertaken. An integrated design is presented that contains components to do receiver tuning, signal processing and separation, code transcription, word matching, syntactic, semantic and pragmatic interpretation. All of these are mediated by a control component which will allow for the great variety of situations that arise in the Coast Guard Morse environment. Finally, components to allow operator intervention, analysis, and logging are described.

Descriptors :   *Morse code, Coast Guard operations, Radio signals, Radio reception, Signal processing, Automatic, Automation, Military requirements

Subject Categories : Radio Communications

Distribution Statement : APPROVED FOR PUBLIC RELEASE