Accession Number : ADA319873

Title :   Video Teleconferencing Performance Testing.

Descriptive Note : Final rept.,

Corporate Author : DELTA INFORMATION SYSTEMS INC HORSHAM PA

Personal Author(s) : Rekstad, Gary

PDF Url : ADA319873

Report Date : DEC 1994

Pagination or Media Count : 109

Abstract : In recent years, with the onset of digital television processing and transmission, developments in television practices have rendered former methods of quality measurements of television signals as less accurate or applicable, as one would expect. In the past, quality measurements of analog television signals were easily verified by use of video test signals that show amplitude and transient response, and for distortion freedom by differential gain and phase. In digital television systems, the advent of bandwidth compression has introduced techniques such as interframe coding which has created the need to identify objective measurements that can be used to accurately verify the quality of the video conducted by the particular digital system in use. The purpose of this subtask is to investigate the results of subjective tests with objective tests made under the same conditions of a selection of video scenes that are considered typical of video telephony, video teleconferencing or entertainment video.

Descriptors :   *PERFORMANCE TESTS, *TELECOMMUNICATIONS, *CONFERENCING(COMMUNICATIONS), TEST AND EVALUATION, COMPRESSION, TRANSIENTS, MEASUREMENT, TELEVISION SYSTEMS, CODING, QUALITY, SIGNALS, GAIN, BANDWIDTH, DIGITAL COMMUNICATIONS, VIDEO SIGNALS, ANALOG SIGNALS, DIFFERENTIAL ANALYZERS.

Subject Categories : Radio Communications

Distribution Statement : APPROVED FOR PUBLIC RELEASE