What is the compression standard for video in digital television (DTV)? What is
ID: 3840999 • Letter: W
Question
What is the compression standard for video in digital television (DTV)? What is an appropriate video compression standard for video telephony over ISDN lines? What are the main differences between HDTV and NTSC video formats? What is the bit-rate generated by a MPEG-1 video coder? What are possible bit-rates of video compressed according to the ITU H.261? Does H.263 yield higher or lower bit-rate than H.261? What was the intended application for MPEG-1? Which audio and video compression systems are used for Digital TV and HDTV? Suppose we are using H.263 to encode video, and we monitor the bit-rate at the output of the encoder. Why do we usually see a peak (burst) in the bit-rate in correspondence of a change of scene? What happens if the first frame of the next scene is encoded in predictive mode instead than in intra frame mode?Explanation / Answer
1)MPEG-2 is the compression standard for video in DTV.
->H.261 is the appropriate video compression standard for videotelephony over ISDN lines.
->differences:
->NTSC was an older analog standard. The new standard is ATSC.HDTV's have theability to display a broadcast resolution of 1080i/720p which can be achievedusing the ATSC tuner that is built into most HDTV's. SDTV was the old standard displaying a broadcast resolution of upto 480i.
->HDTV is a new format for displaying a TV picture. It has higher resolution and clarity than the old NTSC format. Most stations that are broadcasting digitalsignals are now using 4 channels for every 1 they had before.
->They are reserving some channels for HDTV format and some channels for NTSC format. An HDTV will display the HDTV format and probably the NTSC format as well. An HDTV monitor can display the same picture, but probably lacks a tuner to actually receive the television signals. You need to plug something into it like a computer, a DVD player, or a tuner. If that thing sends out an HDTV signal then you can see it on the monitor.
->HD TV is a set of standards for high definition television signals, 1080 lineand 720 line resolutions. The signal format is completely independent of thedisplay device and can be shown on any monitor capable of displaying HD signals.
->HDTV is hi definition tv , which is a digital signal with very good clarity.
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