HD Pixelization

[authorpilot]

Got an OTA HD Receiver hooked up to my Toshiba. Signal strength is strong on my Samsung SIR-T165 on all local stations. I am seeing a flaw in the HD picture and want to know if anyone else experiences the same thing:

The screen shots are normally AWESOME. However, whenever a camera shot pans quickly, the image becomes pixelized for a brief moment. Then when the camera slows or stops, the pixels go away. I also notice this brief pixelization when an image fades in or out from once scene to another. Anyone else experience and/or know why it is occuring?

Thirdly, is "Pixelization" a real word? Or is this something Webster's is going to have to add the the Dictionary because of the advent of HDTV?

Thanks!

[57U]

What you are seeing in the fast pans is "compression artifacts" that manifest themselves as pixellation. MPEG compresses an HD image by about a factor of 50, so, whenever there is a lot of information changing on the screen (like with fast pans, flocks of birds, some sports events, etc), the MPEG cannot keep up.

This is normal, however the effect can usually be minimized by reducing sharpness on your TV and turning off Scan Velocity Modulation, both of which add only "errors" to the TV signal.

Pixellation can also occur on SD digital channels when there is too much compression.

[paule123]

Could be the channel you are speaking of is "multicasting" and not allocating all their available bandwidth to the HD broadcast. Where I am at our local NBC affiliate uses 3-1 for HD, 3-2 for a 4:3 SD broadcast, and 3-3 for weather radar. 3-2 and 3-3 take away from the total available bandwidth that the station has, and as a result the 3-1 HD broadcasts suffer and I see the sort of motion compression problems you speak of. The local ABC and CBS affiliate here do not multicast and as a result, their HD broadcasts are perfection.

If your station is multicasting, complain to the station manager -- they might think twice about doing this as more HDTV viewers come online.

-- Paul

[Rickaracka]

I had the same problem with pixillation however i was receiving hd through my cable company. After changing the connections and a few wires the problem was corrected. My recommendation would be to check all your connections.