Audio (voice) out of sync

I've recently noticed that a number of programs are very noticeably out of voice-video sync. On closer inspection I can see a very slight out-of-sync condition on most programs.

Question - is this a general condition found in digital FTA broadcasts (not TiVo related)?

or

Question 2 - Looking at the flow of program material, starting out analogue, then converted to digital (A/D #1), broadcast FTA, set top box converts back to analogue (D/A #1), then TiVo re-digitizes (A/D #2) and finally TiV converts back to analogue (D/A #2). Is it possible to retain voice-video sync given all the A/D D/A conversions?

Phred

Answer to Q1: No. But I am assuming you mean that the sync issue is not present if you remove the TiVo from the equation?

Answer to Q2: Yes. To even go further I sometimes "daisy chain" multiple TiVo's in the test rack and never have experienced a loss of audio/video sync.

When you say "programs" do you mean recordings or live TV... or both?

And I am assuming the audio signal follows the same path as the video signal through all stages. In other words, you are not splitting the audio off to a sound processor or amplifier before the TiVo or anything like that?

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Answer to Q1: No. But I am assuming you mean that the sync issue is not present if you remove the TiVo from the equation?

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Hi Darren,

Well, not necessarily. My only digital connection is thru the set-top box attached to the TiVo so I don't know if what I'm seeing would be present if the set-top box was directly attached to the TV.

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Answer to Q2: Yes. To even go further I sometimes "daisy chain" multiple TiVo's in the test rack and never have experienced a loss of audio/video sync.

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Ahh, ok that pretty much says the TiVo doesn't introduce sync problems.

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When you say "programs" do you mean recordings or live TV... or both?

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I'll get some specific examples but my recollection is both.

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And I am assuming the audio signal follows the same path as the video signal through all stages. In other words, you are not splitting the audio off to a sound processor or amplifier before the TiVo or anything like that?

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No, straight out if the set-top box into the TiVo and straight out of the TiVo into the TV.

Thanks Darren, I'll get some specific examples.

Phred

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Originally Posted by Phred

Well, not necessarily. My only digital connection is thru the set-top box attached to the TiVo so I don't know if what I'm seeing would be present if the set-top box was directly attached to the TV.

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I would be checking this first and foremost. No good chasing your tail if the problem is being introduced before the TiVo :)