Article on the Serious HDTV Lip-Sync Problem

AUDIOPHILE AUDITION has a new extensive feature on the very serious
problem of lip-sync error caused by video processing on most HDTV
displays, hi-res disc players and broadcast sources. Hasn't had much
attention elsewhere. = http://www.audaud.com/article.php?ArticleID=3011

Besides the interesting article on the lip sync issue, the article is
part of a very nice internet magazine as well so I bookmared the
link. Thank you, John.

On Sat, 14 Jul 2007 20:53:44 -0700, John Henry wrote:

AUDIOPHILE AUDITION has a new extensive feature on the very serious
problem of lip-sync error caused by video processing on most HDTV
displays, hi-res disc players and broadcast sources. Hasn't had much
attention elsewhere. = http://www.audaud.com/article.php?ArticleID=3011

Projector Central review:
http://www.projectorcentral.com/felston_dd740.htm

"John Henry" wrote in message
...
AUDIOPHILE AUDITION has a new extensive feature on the very serious
problem of lip-sync error caused by video processing on most HDTV
displays, hi-res disc players and broadcast sources. Hasn't had much
attention elsewhere. = http://www.audaud.com/article.php?ArticleID=3011


At least one DVD player, the Sony DVP-NS75H, claims to have the ability to
introduce an audio delay. The information on this feature can be found on
page 49 of the manual:

http://www.docs.sony.com/release/DVPNS75H.pdf

I am confused by Sony's disclaimers about how the audio delay will not work
with Dolby Digital or DTS and how the audio delay will not work through
HDMI, optical or coaxial output. Could it be that the audio delay is only
effective on the analog stereo output?

On Sat, 14 Jul 2007 20:53:44 -0700, John Henry
wrote:

AUDIOPHILE AUDITION has a new extensive feature on the very serious
problem of lip-sync error caused by video processing on most HDTV
displays, hi-res disc players and broadcast sources. Hasn't had much
attention elsewhere. = http://www.audaud.com/article.php?ArticleID=3011

My surround sound system has delays for all the speakers, so I have
some control over the lip-sync problem. Unfortunately, different
channels have different delays.

On Jul 14, 8:53 pm, John Henry wrote:
AUDIOPHILE AUDITION has a new extensive feature on the very serious
problem of lip-sync error caused by video processing on most HDTV
displays, hi-res disc players and broadcast sources. Hasn't had much
attention elsewhere. =http://www.audaud.com/article.php?ArticleID=3011

when you mentioned lip sync error, were you talking about
britney spears?

My surround sound receiver has time delay adjustment to sync video and
audio if it's out of sync so I don't have to worry about it even if I
get a Bluray or HD-DVD player that has the lip sync problem.

On Jul 14, 11:53 pm, John Henry wrote:
AUDIOPHILE AUDITION has a new extensive feature on the very serious
problem of lip-sync error caused by video processing on most HDTV
displays, hi-res disc players and broadcast sources. Hasn't had much
attention elsewhere. =http://www.audaud.com/article.php?ArticleID=3011

One Shot Scot wrote:
"John Henry" wrote in message
...

AUDIOPHILE AUDITION has a new extensive feature on the very serious
problem of lip-sync error caused by video processing on most HDTV
displays, hi-res disc players and broadcast sources. Hasn't had much
attention elsewhere. = http://www.audaud.com/article.php?ArticleID=3011



At least one DVD player, the Sony DVP-NS75H, claims to have the ability to
introduce an audio delay. The information on this feature can be found on
page 49 of the manual:

http://www.docs.sony.com/release/DVPNS75H.pdf

I am confused by Sony's disclaimers about how the audio delay will not work
with Dolby Digital or DTS and how the audio delay will not work through
HDMI, optical or coaxial output. Could it be that the audio delay is only
effective on the analog stereo output?



Well that kinda renders it almost useless, huh?! :-)

On Jul 18, 3:04 pm, Sal wrote:
My surround sound receiver has time delay adjustment to sync video and
audio if it's out of sync so I don't have to worry about it even if I
get a Bluray or HD-DVD player that has thelip syncproblem.

On Jul 14, 11:53 pm, John Henry wrote:



AUDIOPHILE AUDITION has a new extensive feature on the very serious
problemoflip-syncerror caused by video processing on most HDTV
displays, hi-res disc players and broadcast sources. Hasn't had much
attention elsewhere. =http://www.audaud.com/article.php?ArticleID=3011- Hide quoted text -

- Show quoted text -

I think most receivers today have a lip-sync delay like John Henry
mentions but most don't have enough delay - some as little as 80 ms
and even those with 200 ms fall to 100 ms for 96 Khz audio - which
usually isn't enough. And none that I've seen allow easy adjustment
of the delay while watching. Most put the adjustment in an obscure
set-up menu which isn't easy to get to and overlays the screen every
time you make an adjustment. That would be fine if it were a one time
set-and forget adjustment as it would be if the screen delay were the
only problem. But that just doesn't work if you need to correct for
the variable video delay for every program and every DVD and if you
don't you will usually still have enough lip-sync error to cause the
subliminal interference Stanford documented. They proved that even
viewers who did not notice the lip-sync error suffered from the same
feelings of disbelief and distrust. Quite the opposite of what I want
in my home theater! Back in 2004 I bought one of the first Felston
DD340 dedicated delays ( three generations ago since their DD740 is
covered in that revoiew and there was a DD540 between them) and
quickly found that it wasn't just my plasma delaying the video a fixed
amount but the swings in video delay already in the signal ranged from
zero to 50 or 60 ms during the course of a day from program to program
on the same network. Even DVD's vary nearly that much. The main
thing the Dd340 and the other dedicated delay boxes in that review do
so well is allow adjusting the delay at the touch of a plus and minus
button while watching the program without any disturbance so you can
get it perfect. You just can't do that on any av receiver I've seen.
I've never seen one with + and - buttons for audio delay on their
remote and one I saw did not even let you see the video at all while
changing the audio delay.