| 摘要 |
Apparatus is disclosed for providing compensation for missing, incorrect or otherwise defective data in a data stream preferably comprised of video information. The apparatus is particularly useful in a magnetic recording and reproducing system for digital video data signals. The apparatus effectively stores the digital video data that occurred 262 video lines prior to the current data at the input and continuously updates, (i.e., stores in place of) the stored data with current data unless defects occur in the current data, in which case the defective current data is not stored. The data from the store is inserted in the video data streams when the drop-outs or parity information associated with the data stream indicates that the current data is defective. By inserting digital data which represents data that occurred 262 horizontal lines previously, the content of the substituted video information has a high probability of being visually equivalent to that of the original current data, since in most cases, it represents data from an adjacent horizontal line in a prior television field. The apparatus inhibits writing of data during substantial portions of the horizontal and vertical blanking intervals and thereby reduces the capacity of the storing means which is required to provide compensation for essentially a full field of active video information.
|
