Error concealment in digital television signals

Details Error concealment in digital television signals Error concealment in digital television signals

1981-09-14

1983-04-26

Martin, John C.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358314, H04N 9535, H04N 9491

Patent

active

043815197

ABSTRACT:
A method of concealing errors in a composite PAL or NTSC digital television signal formed of sample signals corresponding respectively to sample positions along horizontal scan lines of a television picture made up of a plurality of such horizontal lines, comprises, in respect of each sample signal the steps of, using a first algorithm to calculate a first expected value of the sample signal, the first algorithm using actual values of adjacent sample signals in the same horizontal line as the sample signal, using a second algorithm to calculate a second expected value of the sample signal, the second algorithm using actual values of adjacent sample signals in the same horizontal line as the sample signal and actual values of adjacent sample signals in the horizontal lines preceding and following the horizontal line of the sample signal, continuously monitoring which of the first and second algorithms gives expected values closer to the actual values, and on occurrence of an error sample signal using the algorithm currently giving the better result to calculate a corrected sample signal to be substituted for the error sample signal.

REFERENCES:
patent: 4323916 (1982-04-01), Dischert et al.

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