In article m,
David Nebenzahl wrote:

Question is about DTV sound synchronization in the United States (the
only DTV I have any experience of). Seems to me that since it replaced
analog, the synchronization of sound to picture is, at best, variable,
and sometimes it's absolutely ****-poor.

I'm surprised there aren't more complaints about this. Two HD
television sets connected to the same antenna system can have an audio
difference between the two. Weak signal conditions seem to be the
worst, with very obvious delay just before the picture breaks up.

There are probably several reasons for the discrepancy, but there is no
excuse. Audio-video sync shouldn't be a problem with a digital system,
but the current HD system is obviously weak in this area. Perhaps there
is a delay due to the need for error correction when signals are poor.
If so, why isn't one delayed so both audio and video are presented at
the same time? It might take some extra memory to hold delayed data,
and maybe an algorithm to shed an occasional video frame. Or is it the
other way around, with audio leading the video?

I haven't seen this mentioned in Consumer Reports television reviews, so
few of us are complaining about it!

Fred