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Message: <blockquote data-quote="nexsen" data-source="post: 177861" data-attributes="member: 56024">Lip-sync error is very common but insidiously masks itself from most people because sound before the event that caused the sound is impossible in the real world and our brains can't handle the confusing and contradictory aural and visual information.Research at Stanford proved it causes a negatiuve impact on viewer perception making the characters seem more agitated, less successful, less persuasive, etc even when not consciously noticed so those who see it and correct it should not only eliminate the annoyance but eliminate that disruptive albeit subliminal force that plagues essentially all home cinema's.You've already noticed it  but most people who haven't noticed it are probably looking away from the lips subconsciously avoiding this contradiction of nature or perhaps there is some other avoidance mechanism but whatever it is must be the root cause of what Stanford documented.Because of this difference in the detection capabilities of different people this is a very hard topic to discuss on a forum since we do not all perceive the same lip-sync eror even though we might be viewing the same thing.  One person doesn't see 40 ms error and I am now bothered by one millisecond so how do we converse on this subject?For others reading this post that don't believe what I am trying to say, conduct this test:Force your self to really look at the LIPS.  You will probably be amazed at the lip-sync error you previously ignored which will prove some sort of avoidance mechanism is in play.  Some people will find this very hard to do since they have seen very little material that was truly in-sync to compare.Usually most people won't notice 40 or 50 ms (Stanford showed 42 ms still caused the impact on perception) but when a new DLP, LCD, or plasma display adds another 50 or 60 ms the 100 ms plus error may be consciously noticed and after that much smaller lip-sync error becomes annoying.Luckily three companies: Alchemy2, Felston, and Primare make digital audio delays expressly for the purpose of correcting this problem and here is a review of all three:<a href="http://www.audaud.com/article.php?ArticleID=3011" target="_blank">http://www.audaud.com/article.php?ArticleID=3011</a>The most important feature of all of them are the plus and minus buttons which allow on-the-fly fine adjustment of audio delay without disturbing the image you are watching and all of them have that.  The other features like presets, etc. are nice but the plus and minus button adjustment without disrupting your program is the main thing you need for perfect lip-sync.Lip sync error creeps into media starting at image capture and continues through post production and broadcast or DVD encoding and is often well above the 42 ms Stanford showed causes interference with perception before the media center even gets the signals so even if the media center were perfect and introduced no video delay there would still be significant lip-sync error.  The only way to eliminate it is by subjectively matching the video delay with the same audio delay.</blockquote>

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