| 摘要 |
A method of concealing errors in a digital television signal formed by a plurality of sample signals corresponding respectively to sample positions along a horizontal scan line of a television picture made up of a plurality of such lines, comprises, in respect of each sample signal which is in error, selecting from a plurality of algorithms a preferred algorithm for correcting the error sample signal, calculating a corrected value of the error sample signal using the preferred algorithm, and substituting the corrected sample signal for the error sample signal so as to conceal the error. The algorithms may be four in number and use sample values located along the horizontal, vertical and two diagonal directions respectively to predict the known sample values at sample positions adjacent to the position of the error sample signal, the algorithm giving the best result being selected. When the density of other error sample signals in the neighborhood of the error sample signal prevents the selection of the preferred algorithm, the sample signal from a predetermined or a selected position in the television picture adjacent to the position of the error sample signal is substituted for the error sample signal so as to conceal the error.
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