H - Electricity – 03 – M
Patent
H - Electricity
03
M
H03M 13/29 (2006.01) H04B 1/68 (2006.01) H04L 1/00 (2006.01) H04N 7/015 (2006.01) H04N 7/26 (2006.01)
Patent
CA 2413247
An apparatus and method is disclosed for generating robust ATSC 8-VSB bit streams for transmission by a digital transmitter. The apparatus comprises a Reed Solomon encoder unit that encodes a plurality of bit streams including bits to be encoded in a robust ATSC 8-VSB bit stream and bits to be encoded in a standard ATSC 8-VSB bit stream. The apparatus also comprises a trellis encoder unit comprising a symbol mapper unit in which an output symbol R is forced to a value of minus one minus alpha (-1-.alpha.) when R equals minus one (-1) and to a value of plus one plus alpha (+1+.alpha.) when R equals plus one (+1), where the value of alpha (.alpha.) is variable. A control block sets the value of alpha in accordance with the type of bits present within the trellis encoder unit to generate both robust and standard ATSC 8-VSB bit streams.
Birru Dagnachew
Gaddam Vasanth R.
Fetherstonhaugh & Co.
Koninklijke Philips Electronics N.v.
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