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Pages: 1

Bandwidth of SD and HD TV Channels

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Posts: 3
Jul 3rd, 2019 at 5:27pm  
Dear Members

How much bandwidth or data rate normally a Standard Definition (SD) and High Definition (HD) TV channel need for transmission over a satellite link with MPEG-2 and MPEG-4 compression. What are industry norms and do we have any ITU standard for this?

Thanks and regards
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« Last Edit: Jul 5th, 2019 at 3:31am by Sat_Baby »  
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Posts: 989
Reply #1 - Jul 10th, 2019 at 8:39pm  
If you have a look in lyngsat you will get some idea of how many TV channels are merged onto a high bit rate carrier.
e.g. https://www.lyngsat.com/Astra-2E-2F-2G.html

The bit rate allocated to each TV channels varies from moment to moment according to the content of the picture. A highly detailed image that suddenly changes to different highly detailed image will cause a burst of high bit rate. A steady image will have very low bit rate, once it is initially displayed. A still head on still background with lips only moving will have low bit rate. A crowd scene with camera panning might cause moderate bit rate as new image data gets inserted at the side and some people move in the crowd.

Read more: http://www.astra2sat.com/televison/tv-bitrates/

Also read this:  https://www.ofcom.org.uk/__data/assets/pdf_file/0018/27324/zetacast.pdf particularly about trends with bit rates.

Best regards, Eric.
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