Lip sync Most channels have lip sync issues

this is an issue of the signal carrying the sound is not synced with the picture
can be a station transmission problem or weather condition
if it is the same on all channels , take your unit in for a proper diagnosis and quote but I find that normally changing channels for a while will fix it
check the aerial for correct alignment to the station as it could have moved in the winds

lip sync is the combination of the two signal carrier frequencies being out of sync
one signal carries sound and the other the picture and they normally come together correctly but that can be upset by a blip in the power supply, problems in the signal from the station or atmospheric disturbance
try changing channels a few times , try shutting the set down and then restarting it
read the operators manual for any clues in the trouble shooting section
Lastly talk with a repair shop for any advice on how to fix

Lip-sync is a cumulative problem with potential errors entering at any stage in the broadcast chain where video is delayed and an equivalent audio delay is not added to counteract it. It can occur during post production, broadcast (at many stages), and even in disc mastering - and finally your TV may add more video processing delay (especially if HD or 4K TV) making it worse. The only way to correct it completely and have perfect lip-sync is to adjust (or shift) the audio relative to the video at the final output stage. That can fix lip-sync error no mater where it came from.

Since it has been documented that lip-sync error - even when not consciously noticed - causes viewers to perceive the characters and story as "less believable" , many cinema enthusiasts use external delay boxes made by companies like Alchemy2, Felston, Primare, etc.to intercept the audio and delay it to match the video perfectly via remote control.

I use a Felston DD740 and contrary to what the industry believes I can detect lip-sync errors down to the millisecond. I mean when I adjust the DD740 and achieve what looks perfect moving it a ms either direction looks "off". Most viewers will never see "perfect" lip-sync if they aren't performing such an adjustment while viewing.

Getting it "close" - perhaps within 30 or 40 ms - will allow most viewers to ignore it but the study done at Stanford showed the negative impact was still present.

The current theory to explain this is that our brains - even subconsciously - can't process the impossibility of sound before lip-movement and we look away from the lips to avoid the impossible and in doing this we form the same opinion of the characters as we have of people who don't make eye contact with us. Ironically "we" are the ones not making eye contact with the characters in order to avoid the impossibility of sound before lip-movement.

You can run your own test to prove this: Force yourself to focus intently on the lips and you will see lip-sync error you never noticed before. You were ignoring it because it was below your "threshold of recognition" and looking away could conceal it.

After the cable change and adjustment you didn't notice lip sync error because it was probably below that threshold but something ( a digital video effect in the broadcast possibly) boosted it above your threshold and you noticed it again. The only way to eliminate the negative impact is to look for the error and adjust it out.

Most AV receivers and some recent TV's offer a fixed audio delay to correct lip-sync error and that can usually get it close enough that most people won't consciously be bothered but masking the problem like that doesn't eliminate the negative impact on the characters and story.

I don't see a question. Are you asking about a lip-sync problem and how to correct lip-sync error? If so I need more detail to answer your question.

Hi, Your TV is OK, it's your cable companys problem.
On some channels you will have this but not all. Beleive me it's not your TV. I have the same trouble.

should be in set up menu in denon receiver

Hello
Just do this first and determine the fault. Connect your Vozio to an external antenna, to its antenna socket, and set it to autotune. You can refer to its user manual to how to do this. Let the TV tune all transmitting stations at that time, and memmorize it. After auto tuning is complete. select the channels one by one and check if they are perfect in every respec or not. Itf they are perfect, your cable TV operator is lying. As I know, Vizio is a perfect set. Do the above and determine. If the transmitting stations are also bad, surely your TVs tuner has damaged, and should be replaced with same type and number.
OK.

Hi

Try Buying a aerial with a booster, u can purchase a inline booster at dicksmith or most large electrical stores.

kinds regards Kyle

u can reach me at
[email protected]

hello there
First things First:
1) change the digital opt, cable, for another with cooper conduction. **
2) check connection again on low volume.

good luck

if you are saying that your tv has no sound to match the lips movements then you will have to get a tech to repair your tv the problem is in the audio circuit could be a cap or the audio output ic.if you are saying that the tv has sound but it is not syncronizing with the lip movements have your tech check the sync circuit it is possible that the operating voltage is too small to allow the sync circuit to operate.good luck my friend.