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HDTV and lip sync


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9 replies to this topic

#1 of 10 OFFLINE   Doug Smith

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Posted June 04 2003 - 05:28 AM

In my area, often when watching the HDTV channels, the sound and the lips are out of sync.(the sound is a split second behind) It reminds me of watching some of the old B grade Japanese flicks. What's the reason for this?

#2 of 10 OFFLINE   Adam_ME

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Posted June 04 2003 - 05:45 AM

I've noticed this occasionally on ABC. In particular, their Saturday night movies.
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#3 of 10 OFFLINE   Tyler DJW

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Posted June 04 2003 - 08:40 AM

Have to report the same here. ABC in San Francisco is often noticably out-of-sync. The same station also is plagued with a frequent ticking sound (subtle, but annoying) through much of it's programming, at least that's what I've found.

No idea what the cause of the problem is.
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#4 of 10 OFFLINE   Douglas*A*R

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Posted June 04 2003 - 02:16 PM

It might be due to something called multi-path. As I understand it, that's where a signal is sent directly from the transmitter to your antenna, but is also reflected by some object(s) so that the same signal arrives a split second later. Several things can cause it, like hills, high-rises, airplanes, etc.

#5 of 10 OFFLINE   Matt Stone

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Posted June 04 2003 - 04:26 PM

I don't think so, Douglas. I have HD over cable and I encounter the same problem on ABC in Lafayette, IN. Must just be an ABC thing.
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#6 of 10 OFFLINE   Wayne Bundrick

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Posted June 05 2003 - 09:22 AM

Quote:
It might be due to something called multi-path. As I understand it, that's where a signal is sent directly from the transmitter to your antenna, but is also reflected by some object(s) so that the same signal arrives a split second later. Several things can cause it, like hills, high-rises, airplanes, etc.

Multipath causes overall reception problems but it can't cause the audio data stream to become mismatched with the video data stream. The problem has to be either at the ABC network or at the local ABC station.
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#7 of 10 OFFLINE   Jeff Jacobson

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Posted June 05 2003 - 09:29 AM

I've noticed the same thing, but with Standard Definition TV on a FOX affiliate.

#8 of 10 OFFLINE   Douglas*A*R

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Posted June 05 2003 - 09:43 AM

I don't think so, Douglas. I have HD over cable and I encounter the same problem on ABC in Lafayette, IN. Must just be an ABC thing.


Hmm, I'm stumped then. I don't know much about the multi-path phenomenon, but I thought I'd just throw it out there as a possibility.

Have you called your cable company and/or local station(s) about the problem?

#9 of 10 OFFLINE   Matt Stone

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Posted June 05 2003 - 10:49 AM

Quote:
Have you called your cable company and/or local station(s) about the problem?


No, but it's just out of apathy. I really don't watch too much ABC, and I don't notice the problem all the time.

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#10 of 10 OFFLINE   jimmy~e

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Posted June 05 2003 - 05:05 PM

I have the same problem with out of sync audio but I have not correlated it with specific channels. It occurs somewhat randomly for me on just about any station. I have a digital high def cable box (Time Warner) and an NEC HT1000 front projector. I do not notice it on my CRT Toshiba that is digital cable from the same feed but not a high definition box.





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