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#1
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Why is Television Signal from space so degraded?
It seems that all video from space is slightly degraded, ie lower rez
than normal NTSC. Is this a function of lower grade cameras, compressed signal, or some orbital condition? I notice that digital images look fine, such as videos returned to Earth. |
#2
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Why is Television Signal from space so degraded?
The downlinked video is MPEG2 compressed.
There are different settings for the bandwidth of the video signals set by the CATO (comm officer) depending on how much bandwidth the payloads folks are asked to give up. The external cameras (truss and Lab mounted) seem to generate better quality video than the Canadarm2-mounted cameras. However the arm cameras are necessarily smaller physical units. At the highest settable frame rate (I think that's the parameter, but would have to check) even the arm camera video looks decent, although it's obviously not quite broadcast quality by the time it makes it downhill. "Gary Coffman" wrote in message ... On 16 Aug 2003 10:10:24 -0700, (Explorer8939) wrote: It seems that all video from space is slightly degraded, ie lower rez than normal NTSC. Is this a function of lower grade cameras, compressed signal, or some orbital condition? Many of the cameras they use aren't up to current broadcast practice. They typically run them with auto iris control, which doesn't work well in high contrast settings. Most importantly, the lighting isn't up to broadcast standards, nor is the camera work. In broadcasting we say that at least 50% of picture quality is dependent on lighting, and the camera operator. Current broadcast camera technology is rarely the limiting factor to good picture quality. Gary |
#3
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Why is Television Signal from space so degraded?
"Tim Braithwaite" wrote in
: The downlinked video is MPEG2 compressed. There are different settings for the bandwidth of the video signals set by the CATO (comm officer) depending on how much bandwidth the payloads folks are asked to give up. I do feel compelled, for the benefit of those who think CATO is Green Hornet's chauffeur, that your answer applies only to ISS. :-) Shuttle video is not, as far as I know, MPEG2 compressed. -- JRF Reply-to address spam-proofed - to reply by E-mail, check "Organization" (I am not assimilated) and think one step ahead of IBM. |
#4
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Why is Television Signal from space so degraded?
Absolutely. Thanks, Jorge
I'm talking about ISS video and the ISS control room. This is, after all, sci.space.station "Jorge R. Frank" wrote in message ... "Tim Braithwaite" wrote in : The downlinked video is MPEG2 compressed. There are different settings for the bandwidth of the video signals set by the CATO (comm officer) depending on how much bandwidth the payloads folks are asked to give up. I do feel compelled, for the benefit of those who think CATO is Green Hornet's chauffeur, that your answer applies only to ISS. :-) Shuttle video is not, as far as I know, MPEG2 compressed. -- JRF Reply-to address spam-proofed - to reply by E-mail, check "Organization" (I am not assimilated) and think one step ahead of IBM. |
#5
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Why is Television Signal from space so degraded?
"Tim Braithwaite" wrote in
news Absolutely. Thanks, Jorge I'm talking about ISS video and the ISS control room. This is, after all, sci.space.station Right. My mistake, I'm browsing through the groups too quickly. Sorry! :-) -- JRF Reply-to address spam-proofed - to reply by E-mail, check "Organization" (I am not assimilated) and think one step ahead of IBM. |
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