Error concealment method and apparatus

摘要

Bit streams transmitted from a coding system through a transmission channel are divided on a block-by-block basis based on bit numbers thereof and a parity bit added to each bit stream is checked to decide whether or not each bit stream is error bit stream having one or more error bits therein. Based on the check result, either each bit stream or a proximate bit stream for each bit stream is selected as an optimum bit stream, wherein the proximate bit stream is generated based on degrees of proximity between masked transform coefficients for each candidate bit stream and masked transform coefficients for each of reference bit streams spatially adjacent to each bit stream.