Pulse or digital communications – Systems using alternating or pulsating current – Plural channels for transmission of a single pulse train
Reexamination Certificate
2005-12-06
2005-12-06
Ha, Dac V. (Department: 2634)
Pulse or digital communications
Systems using alternating or pulsating current
Plural channels for transmission of a single pulse train
C375S270000, C375S301000, C714S756000, C348S469000
Reexamination Certificate
active
06973137
ABSTRACT:
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−α) when R equals minus one (−1) and to a value of plus one plus alpha (+1+α) when R equals plus one (+1), where the value of alpha (α) 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.
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“Trellis Codes Modulation with Redundant Signal Sets Part” by G. Ungerboeck, IEEE Communications Magazine, vol. 25, No. 2, Feb. 1987.
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Birru Dagnachew
Gaddam Vasanth Reddy
Ha Dac V.
Koninklijke Philips Electronics , N.V.
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