Error concealment in digital television signals
First Claim
1. A method of concealing errors in a digital television signal, which television signal comprises 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, the method comprising, in respect of each said sample signal which is in error:
- selecting from a plurality of algorithms a preferred algorithm for correcting such error sample signal;
calculating a corrected value of said error sample signal using said preferred algorithm;
substituting said corrected value of said error sample signal for said error sample signal so as to conceal the error; and
supplying said digital television signal having said corrected values of said error sample signal to an output for use in a television signal processing device.
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Accused Products
Abstract
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, the method comprising, 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 four different directions respectively, such as the horizontal, the vertical, and the two diagonal directions of the television raster, 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.
109 Citations
14 Claims
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1. A method of concealing errors in a digital television signal, which television signal comprises 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, the method comprising, in respect of each said sample signal which is in error:
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selecting from a plurality of algorithms a preferred algorithm for correcting such error sample signal; calculating a corrected value of said error sample signal using said preferred algorithm; substituting said corrected value of said error sample signal for said error sample signal so as to conceal the error; and supplying said digital television signal having said corrected values of said error sample signal to an output for use in a television signal processing device. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. Apparatus for concealing errors in a digital television signal, which television signal comprises 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, the apparatus comprising:
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means operative in respect of each said sample signal which is in error to select from a plurality of algorithms a preferred algorithm for correcting such error sample signal; means to calculate a corrected value of said error sample signal using said preferred algorithm; and means to substitute said corrected value of said error sample signal for said error sample signal so as to conceal said error. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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Specification