It has historically been a ‘given’ that television content is comprised of moving pictures and sound – and that the pictures and sound are presented in synchrony in the viewing / listening environment. Complex signal processing, distribution environments and consumer equipment have all conspired to make the synchronous presentation of pictures and the accompanying sound to a consumer a challenging task.
This document describes the nature of video and audio synchrony, how to recognize and measure the loss of synchrony, and potential identification and remediation steps when that synchrony is lost.