Video signal processing on some flat-screen TVs can cause slight delays between the video and audio signals, so the sound is no longer synchronised with the action on screen. A/V Sync technology adjusts the audio signal to correct this annoying problem. Most Sony receivers and home cinema systems incorporate A/V Sync.
Found on http://www.sony.co.uk/glossary/ShowGlossary.action?site=odw_en_GB§ionty
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