Method and apparatus for processing a digital color video signal
First Claim
1. A method of processing a digital signal comprised of a plurality of N-bit words which have been code converted from a plurality of M-bit words in accordance with a predetermined mapping function, said method comprising the steps of:
- reconverting each of said N-bit words to a respective one of said M-bit words in accordance with said mapping function, with said plurality of reconverted M-bit words forming a data unit for every predetermined number of words thereof;
detecting whether any of said M-bit words contain an error by failing to satisfy the mapping function during said step of reconverting; and
determining that each data unit that includes an M-bit word having an error is erroneous.
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Abstract
A method for processing a digital color video signal formed of 8-bit words, includes the recording steps of converting each 8-bit word into a 10-bit word in accordance with a predetermined mapping function, grouping the 10-bit words into 48 word blocks, adding to each block an identification signal, identification signal check words P1 and Q1, and data check words P2 and Q2, the latter being formed by the equations: ##EQU1## where T-1, T-2, . . . T-(n-1), T-n, T1, T2, . . . Tn-1, Tn are distinct, non-zero elements of a Galois field (2m); and includes the reproducing steps of reconverting each of the 10-bit words to its corresponding 8-bit word in accordance with the predetermined mapping function with the reconverted 8-bit words forming a data unit for each 12 words thereof and a data block for each 48 words thereof, detecting whether any of the 8-bit words contain an error by failing to satisfy the mapping function reconversion, determining that each data unit that includes an 8-bit word having an error is erroneous, detecting and correcting any errors in the identification signals by means of the identification signal check words P1 and Q1, determining whether each erroneous data block and data unit is capable of being corrected and concealing each erroneous data unit that is determined to be uncorrectable and correcting errors in the 8-bit words in each erroneous data block and data unit that is determined to be correctable, by means of the data check words P2 and Q2 and parity words, respectively, thereby forming a continuous, composite digital color video signal, and correcting the phase of the color sub-carrier of each data unit of the composite digital color video signal by comparison of a reference signal with the identification signal of the block to which each respective data unit belongs.
136 Citations
31 Claims
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1. A method of processing a digital signal comprised of a plurality of N-bit words which have been code converted from a plurality of M-bit words in accordance with a predetermined mapping function, said method comprising the steps of:
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reconverting each of said N-bit words to a respective one of said M-bit words in accordance with said mapping function, with said plurality of reconverted M-bit words forming a data unit for every predetermined number of words thereof; detecting whether any of said M-bit words contain an error by failing to satisfy the mapping function during said step of reconverting; and determining that each data unit that includes an M-bit word having an error is erroneous. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of processing a digital signal comprising the steps of:
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sampling an analog signal at a predetermined frequency; converting the sampled signal into digitized form; forming a data block for every predetermined number of bits of said digital signal; adding an identification signal to each data block for identification thereof; and adding an error correcting signal to each of said identification signals. - View Dependent Claims (10, 11)
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12. A method of processing a digital signal comprising the steps of:
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sampling an analog signal at a predetermined frequency; converting said sampled signal into digitized form; forming a data word every m bits; and adding two check words P and Q to every n data words, each check word having m bits and said check words being formed by the equations;
##EQU10## where T-1, T-2,-T-(n-1),T-n,T1,T2,-,Tn-1,Tn are distinct, non-zero elements of a Galois field (2m).
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13. Apparatus for processing a digital signal comprised of a plurality of N-bit words which have been code converted from a plurality of M-bit words in accordance with a predetermined mapping function, comprising:
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reconverting means for reconverting each of said N-bit words to a respective one of said M-bit words in accordance with said mapping function, with said plurality of reconverted M-bit words forming a data unit for every predetermined number of words thereof; first detecting means for detecting whether any of said M-bit words contain an error by failing to satisfy the mapping function when reconverted by said reconverting means; and first judging means for determining that each data unit that includes an M-bit word having an error is erroneous. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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21. Apparatus for processing a digital signal, comprising:
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sampling means for sampling an analog signal at a predetermined frequency; converting means for converting the sampled signal into digitized form; forming means for forming a data block for every predetermined number of bits of said digital signal; first adding means for adding an identification signal to each data block for identification thereof; and second adding means for adding an error correcting signal to each of said identification signals. - View Dependent Claims (22, 23)
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24. Apparatus for processing a digital signal, comprising:
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sampling means for sampling an analog signal at a predetermined frequency; converting means for converting said sampled signal into digitized form; forming means for forming a data word every m bits; and adding means for adding two check words P and Q to every n data words, each check word having m bits and said check words being formed by the equations;
##EQU11## where T-1,T-2,-T-(n-1),T-n,T1,T2,-,Tn-1,T.sup.n are distinct, non-zero elements of a Galois field (2m). - View Dependent Claims (25, 26, 27, 28, 29, 30, 31)
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Specification