System for digital television broadcasting using modified...

Details System for digital television broadcasting using modified... System for digital television broadcasting using modified...

2011-08-23

2011-08-23

Fan, Chieh M (Department: 2611)

Pulse or digital communications

Transmitters

Amplitude modulation

C375S265000

Reexamination Certificate

active

08005166

ABSTRACT:
8VSB-compatible DTV broadcasting that employs outer coding of a sort in which interleaved data and outer coding parity are inner coded by the ⅔ trellis code encoder is improved. This is done by recoding each successive pair of bits in the interleaved data and outer coding parity in accordance with an “anti-Gray” code before being inner coded by the ⅔ trellis code encoder. Accordingly, in the DTV receiver an adjacent-bin error during data slicing may generate a double-bit error in a pair of bits as ⅔ trellis decoded, but this is reduced to a single-bit error after the pair of bits is recoded in accordance with a Gray coding procedure. In one example of such recoding, 10 and 11 bit-pairs of the interleaved data and outer coding parity are recoded to 11 and 10 bit-pairs respectively, but the 00 and 01 bit-pairs are not recoded.

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