[opendtv] Re: (S) DTV adaptors available for less than 50 euros in France

In all the Reed-Solomon codes that I've run across, the errors could occur 
equally, anywhere in the R-S code word, not just the parity bytes, with the 
same error detection/correction capability.
Obviously, this is very important in real communications systems that suffer 
errors equally in the data and parity bytes.
 
                                     <holl_ands>
 
===============================================================
Allen Le Roy Limberg <allimberg@xxxxxxxxxxxx> wrote:
The (207, 187) Reed-Solomon codes used in 8VSB DTV were designed to correct
10 bytes out of the 207 in each data segment. That is, 10 bytes in the
187-byte MPEG-2 packet presuming the erroneous bytes are not in the R-S
parity bytes.

If one locates byte errors independently, 20 erroneous bytes can be
corrected in each data segment using an alternative RS decoding algorithm.
Erroneous bytes can be located pretty well by soft trellis decoding, but the
exact techniques are proprietary. The methods are similar to those used for
correcting erasures in digital tape recording. Linear block codes that
"halve" code rate can be used for error location, a (15, 8) code being

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