Error concealment in digital simulcast AD-HDTV decoder

The authors describe strategies developed for concealment of channel errors in the advanced digital high-definition television (AD-HDTV) system. Error concealment performed at the receiver was supported by a custom transport structure which reliably detects errors and helps identify the picture area in which compressed information is lost. The error concealment processor then attempts to repair the damaged portions of the pictures by exploiting spatial and temporal redundancies in the received and reconstructed video signals. These concealment procedures, combined with prioritized data encoding, enabled the AD-HDTV system to deliver acceptable image quality under severely impaired reception conditions, while delivering superb quality under typical transmission impairments