At InfoCom we demonstrated how the DD740 can shift audio putting it in sync with video and restoring reality.

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The only way to correct lip-sync error caused by delayed video is to delay audio an equal amount. If the content producer has already delayed the audio too much in an attempt at correction for image sizes ranging from 720 to 8K there is NO product that can correct it.

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Most people initially only notice lip-sync error when it exceeds 40 to 75 ms.  We call the value at which it is noticed consciously their "threshold of recognition" and it varies enormously from person to person depending upon the individual's defense mechanism - how far he can look away from the moving lips so as to ignore the lip-sync error.

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An individual's "threshold of recognition" falls greatly once it has been reached and lip-sync error has been noticed.  At that point their defense mechanism can no longer compensate and the sync problem enters their conscious mind.  The same person who was never bothered by a 40 ms lip-sync error may, after noticing 120 ms error, become far more sensitive and notice errors of a few milliseconds - a small fraction of their previous "threshold".   Most people can "see" lip-sync error as small as "one millisecond" when focusing on lip movement.  Some can even detect 1/3 ms error.

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Even some expert sound editors have thought getting sound within one frame of the video (33 ms for 30 fps TV for example) was all you needed for perfect lip-sync. It is easy to make that mistake until you realize the repeating static frames create the perception of continuous motion “within our brain” and sound needs to align with that “perception” just as it would in the real world.

 

                                                              Here's our solution:

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The Felston DD740  digital audio delay solves lip-sync error by letting you delay audio (including Dolby Digital) in 1 ms  (or 1/3 ms in fine mode) steps to compensate for the cumulative and changing video delays - no matter what their cause - at the touch of a button on its remote while watching TV. We used to provide a money back guarantee it would solve your lip-sync problem but today all we can guarantee is that the DD740 can correct lip-sync "if it can be corrected".

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Is it possible it might not work for you? Unfortunately, yes. In cases where a broadcaster transmits "already delayed" audio there is NO product that can delay 4K or 8K video to correct it. But if it's not more than your system's inherent  video delay a DD740 can.  Click HERE for more detail.

The DD740 connects between up to four digital audio sources and your AV receiver (or Sound -Bar) allowing you to delay the audio to match the video achieving "perfect lip-sync".  Because lip-sync error changes between sources and even between programs on the same source the DD740's hand held remote is an essential part of true lip-sync error correction. It allows moving the audio back and forth at the touch of a button without any disturbance in the video

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To buy the DD740 click the link to PayPal below. Our products are also on Amazon and eBay at slightly different  prices.(eBay because they offer an international shipping program beneficial to our foreign customers.)

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Save $70: We have a few with water stained cartons for $99. Their packaging was discolored by a flood but they were not wet.