AIR WEATHER SERVICE TERMINAL AREA CONSIDERATIONS CODED GRAPHICS RECORDERS
ITT COMMUNICATION SYSTEMS INC PARAMUS NJ
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Terminal area graphic recorders were studied with a view to meeting future AWS needs in transmitting graphic meteorological information. Utilizations of digital encoding and modern graphic reproduction techniques may satisfy the requirements of an increased traffic load with no increase in the present nominal 4 kc bandwidth. Coded Graphics is defined as any method for transmitting hard copy having less redundancy than conventional line-byline scanning facsimile. Generally, only non-white point locations on the copy are transmitted. Transmission of invariant portions, such as geographic background, may also be avoided. The number of non-white points in a message and the encoding method used will determine the length of time required to transmit the information. Coded graphics recorder techniques show superiority over presently used facsimile by providing multiple copies, and copies with better legibility and esthetic quality. Cost projections over a ten year period show that a savings may be possible using coded graphic techniques. Seven coded graphics recorder types were found to be applicable by this study. Three of the seven hold promise for future AWS network applications. A study of digital encoding techniques and establishment of a set of performance requirements is scheduled for follow-on contractual activity.