DirectTV chroma bug??? (1 Viewer)

[Daniel Mc]

I'd been enjoying my new DirectTV system for about a week when I noticed that pure red on the screen resulted in the "jaggies" typical of the chroma bug on DVD players. Has anyone else noticed this on their satellite system?

(In case the satellite receiver makes a difference, I'm using a Philips DSX 5353.)

 

[Ian Montgomerie]

Yes, it probably does. DirecTV boxes use an MPEG2 decoder, just like DVD players do.

 

[Jeff D]

Isn't the chroma bug a problem with progressive signals and not interlaced signals?

The Philips DSX 5353 isn't a HDTV DTV box, so I don't think that would be the problem.

I don't see the problem on my Sony HD-100. Do you have some examples for us to check out?

 

[Allan Jayne]

Depending on the source material and how it was broadcast, the chroma bug could show up anywhere. It can be seen in interlaced video if you look hard enough. It is less obtrusive in interlaced video because the odd scan lines fade as the even scan lines are being drawn, and vice versa. It is more obtrusive in computer generated video where more precise alignment of picture details upon scan lines, and more precise color transitions, is achievable.
Any source (which includes U.S. HDTV and all DVD's) where at any time in its life there is preserved one row of color pixels for every two rows of luminance pixels will exhibit the chroma bug if the video is not processed in later stages in a manner to avoid it. The bug could be introduced incorrigibly by a TV station or CATV headquarters too, where an analog signal is being prepared from a digital source for broadcast.
More:
http://members.aol.com/ajaynejr/vidbug2.htm

 

[Jim_F]

The bug could be introduced incorrigibly by a TV station or CATV headquarters too, where an analog signal is being prepared from a digital source for broadcast.

Interesting. Thank you! After looking at examples and reading personal accounts, I wondered why I saw what looked like evidence of the chroma upsampling error much more often (and much more severe) on my CATV feed than from my (S9000ES) DVD player.