Excavating
Patent
1988-06-06
1989-10-10
Fleming, Michael R.
Excavating
371 381, G06F 1100
Patent
active
048736899
ABSTRACT:
A method and apparatus for correcting errors in the digital data of a television signal, wherein the digital signals are Golay codes having 23 bits constituted by two parts: a message and a redundance. If there are between zero and three errors to be corrected, there are 2048 possible cases, whose examination one by one would be too time-consuming and/or too expensive in a memory. However, if there are two errors in one of the parts, there cannot be more than one error in the other part. Therefore, in a first case, one of the parts does not comprise errors and serves to recreate the other part (1-8) completely. In the other case, one of the parts comprises only one error: there is started from this part; the different bits susceptible to being affected by the single error thereof are modified in turn (9,12) and there is each tiem verified (10,13,15) whether the other part could correspond to the modified part. The total number of tests is thus strongly limited.
REFERENCES:
patent: 4397022 (1983-08-01), Weng
patent: 4414667 (1983-11-01), Bennett
patent: 4613860 (1986-09-01), Currie
patent: 4648091 (1987-03-01), Gajjar
patent: 4757498 (1988-07-01), Murray
Fleming Michael R.
Marion Michael E.
U.S. Philips Corporation
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