H - Electricity – 04 – L
Patent
H - Electricity
04
L
H04L 29/02 (2006.01) H04N 7/015 (2006.01) H04N 7/64 (2006.01) H04N 7/66 (2006.01)
Patent
CA 2404404
A digital transmission system and method that improves upon the ATSC A/53 H1DTV signal transmission standard includes: a first forward error correction (FEC) unit for encoding packets belonging to each of robust and normal data bit streams; a robust processor unit for receiving robust packets comprising priority data and processing the packets for generating the robust bit stream; a trellis encoder unit for producing a stream of trellis encoded data bits corresponding to bits of the normal and robust streams, the encoder employing mapping of encoded data bits of said robust packets into symbols according to one or more symbol mapping schemes; and, an optional second forward error correction (FEC) encoding unit for ensuring backward compatibility with a receiver device by reading in only packets of the robust bit stream and enabling generation of parity bytes only for the robust stream packets; and, a transmitter device for transmitting the robust bit streams in a backwards compatible manner, separately or in conjunction with said normal bit stream over a fixed bandwidth communications channel to a receiver device, wherein an existing receiver device is capable of receiving and processing packets of the robust bit stream as null packets.
Birru Dagnachew
Gaddam Vasanth R.
Fetherstonhaugh & Co.
Koninklijke Philips Electronics N.v.
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