Nt1330 Unit 2 Assignment

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1.2.1 H.120
The first coding standard approved by CCITT (International Telegraph and Telephone Consultative Committee) in 1984 and again revised in 1988. The H.120 Version I are conditional replenishment, Differential Pulse Code Modulation (DPCM), scalar quantization and Variable Length Coding (VLC).Version 2 includes the process of motion compensation and background prediction. The operational data rate is 1544-2048 Kbps.

Table 1.1 Video coding standards [43]
Video standards Organization Data rates Approved year
H.120 CCITT 1544-2048 Kbps Approved in 1984,revised in 1988
H.261 ITU-T 64-2048 Kbps Approved in 1991,revised in 1993
MPEG-1 MPEG 1-2 Mbps Approved in 1993
MPEG-2 MPEG 4-30 Mbps Approved in 1995
H.263 ITU-T 10-2048 Kbps Approved in
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The data rate of H.261 is 64-2048 Kbps. The framework coding is based on the hybrid video coding structure. Due to the simplified structure and hardware implementation H.261 is still used in video applications. MPEG-1 is a video compression standard developed in joint operation by International Standards Organization (ISO) and International Electro-Technical Commission (IEC).The system development was started in 1988 and finished in 1990, and it was accepted as standard in 1992. MPEG-1 can be used at higher bit rates than H.261, at about1.5 megabits per second, which is suitable for storing the compressed video stream on compact disks or for using with interactive multimedia systems. In early1990’s MPEG-1 was framed and accepted in 1993 by ISO/IEC. It is mainly used for compression of audio and video with loss of data. The coding efficiency of MPEG-1 is better than H.261 at data rates higher than 1