Accession Number : ADA257186
Title : Standardization of End-to-End Performance of Digital Video Teleconferencing/Video Telephony Systems
Descriptive Note : Final rept.
Corporate Author : DELTA INFORMATION SYSTEMS INC HORSHAM PA
Report Date : Dec 1991
Pagination or Media Count : 102
Abstract : This report covers the standardization of end-to-end performance for full motion videophone and video teleconferencing. It investigates the criteria for such a standardization on an end-to-end basis to ensure delivery of a specified quality of service for various Government TV applications. It is distinguished from the previous effort covered in TIB 90-6 by concentrating on a codec designed in accordance with CCITT Standard H.261. Section 2 of this report describes the available background material consisting of both previous NCS programs and related efforts performed in conjunction with the deliberations of ANSI Committee T1Q1.5. Section 3 contains the various criteria that had to be considered, concentrating on the test material and the characteristics of the codec under test. Section 4 describes the subjective evaluation of the processed test tapes which were rated in terms of picture impairment by a panel of impartial evaluators. Section 5 covers objective tests and includes the overall methodology and test results for three parameters which have previously been identified as important for the objective evaluation of codec performance. Correlation between subjective and objective test results is examined it Section 6. Section 7 discusses the overall results and adds a few not Video teleconferencing, Full motion videophone. previously mentioned factors. Section 8 briefly summarizes the total program and suggests a number of follow-on tests which together will form a solid basis for an end-to-end performance standard for digital video teleconferencing/video telephony systems.
Descriptors : *STANDARDIZATION , *TELECOMMUNICATIONS , *CONFERENCING(COMMUNICATIONS) , *VIDEOPHONES , TEST AND EVALUATION , METHODOLOGY , DELIVERY , PARAMETERS , MATERIALS , PANELS , NUMBERS , PICTURES , TAPES , BACKGROUND , MOTION , SOLIDS , CORRELATION , QUALITY , STANDARDS
Subject Categories : Non-radio Communications
Distribution Statement : APPROVED FOR PUBLIC RELEASE