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Why the audio is not in sync with video?

by john7744 / August 22, 2005 12:26 AM PDT

Hello Everyone,
I need you your help in sync up the video and audio. It looks like the audio is a bit behind (latency) the video.
My video/audio systems:
- TV Display: Pioneer PRO-1410HD.
- Samsung HD Tuner/Receiver. Connect to TV Display via Monster Component Cable.
- Audio Output of the HD Tuner/Receiver goes to Bose LifeStyle 48 system via digital cable that comes with Bose system.

As a man on TV speaks his voice is not in sync with his lip movement. The sound is a bit behind the words. This is really annoying :-).
Please advise me of what to do to sync up the video and the sound.
Thanks a lot for your help here.

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A variety of causes.
by R. Proffitt Forum moderator / August 22, 2005 1:00 AM PDT

But I've noticed that even TV stations are letting the sync slide a bit more. I think it's a dollar issue. It may be that the costs to sync up that area is thought to be unimportant compared to the schedule? We can only guess.

I've seen a few DVDs that have the same technical flaw.

You are not alone in spotting this. Some gear can tweak the sync a little, but I don't own your equipment so you'll have to find out if such an adjustment is in there.


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Thanks Bob!
by john7744 / August 22, 2005 1:07 AM PDT
In reply to: A variety of causes.

I feel a bit better knowing this is quite common. I need to stop by Best Buy this afternoon to see if they have the same audio latency problem.

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Why the audio is not in sync with video?
by jcrobso / August 22, 2005 1:18 AM PDT

My guess is that this is a digital processing delay.
I did a large instlation with 5500 ansi lunen projctor to a 9'x12' screen great picture but the sound was not in sync. It turned out in this case that the video was beening delayed do to the processing ocuring in the projector. So to fix it I put a delay in the audio to resync the two.
In you case your saying the the Audio is behind the video. Can you hook an audio line from your tv instead of the digtal line to see if the problem gets better? John

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Hi John...
by john7744 / August 22, 2005 1:47 AM PDT

<...Can you hook an audio line from your tv instead of the digtal line to see if the problem gets better?...>
I'm not good at configuring electronic devices.. so please be patient with me. My understanding of your advice is I need to run the audio output of the HD Tuner/Receiver to the TV Display (Pionner Elite PRO-1410HD is just a plasma display. No speakers come with it. I do not know if the component cable - which connects HD Tuner/Receiver to TV Display - is able to handle both Video and Audio altogether? In this case I do not need to run any Audio line to the TV Display?!!) then run the Audio Out from the TV Display to the Audio In of the Bose box?
Please correct me if I misunderstood your advice.

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because you have to replace all 3 bulbs at the same time.
by jcrobso / August 22, 2005 6:18 AM PDT
In reply to: Hi John...

Ok, Try using a standard audio cable from the HDTV tuner and going directly to the Bose audio system and bypass the TV for the audio, see if this makes a difference.
A componet cable is for video only. You would also need a audio cable.
Since the Pro-1410HD is a disply only, send only the video to it and the audio to the Bose. John

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Audio Video Sync
by terrmul / August 22, 2005 9:53 AM PDT

Usually this problem is the other way around, video lags audio. This is due to video processing circuits and the time it takes to do this. In your case though you think that audio is lagging video. I'm not too familiar with the Bose system, we stay away from it, but my guess is that because of the audio setup within the Bose there is significant delay there. Check your settings on the lifestyle to verify any setup changes that might change audio settings, pay attention to digital signal processing or DSP's. Look for "direct", "normal" or just flick through all options and see which sounds best.

Terry Mulholland
Beyond Home Theater

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by john7744 / August 23, 2005 3:21 AM PDT
In reply to: Audio Video Sync

Thanks a lot for the tips.
<...Usually this problem is the other way around, video lags audio. This is due to video processing circuits and the time it takes to do this. ...>

You could be right Terry. I will have to look into this again.

<... I'm not too familiar with the Bose system, we stay away from it...>
It's too late for me now. I regret that I bought the system without having done any research. I always thought Bose was good but it is not for big room. arrrrgggg!!!

Will go thru the settings on Bose and try them out tonite.
Thanks again for the tips.

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John & Terry!!
by john7744 / August 24, 2005 12:01 AM PDT
In reply to: Terry!!!

I bought a digital connector cable for the HD Tuner to the Bose box and it solves the audio latency problem. It seems to me that the video signal was processed a bit faster (Monster digital cable) than audio signal (Bose standard analog cable). Anyway, Bose sucks!
Thanks for your tips.

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