Trellis coded modulation system for digital television signal with trellis coded data and synchronization symbols
AssigneeZenith Electronics Corporation
InventorsMark Fimoff, Richard W. Citta, Wayne E. Bretl
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Abstract
A transmitter transmits, and a receiver receives, a data frame is transmitted into an 8 MHZ channel. The data frame contains a plurality of data segments, where each of the data segments contain DS symbols. The DS symbols include data symbols, priming symbols, and segment synchronization symbols. The transmitter trellis encodes the data symbols, priming symbols, and segment synchronization symbols. The receiver trellis decodes the data symbols, priming symbols, and segment synchronization symbols. The data frame also contains a mode control ID which the receiver uses in trellis decoding the data symbols, priming symbols, and segment synchronization symbols.
Claims40
A trellis coded modulator comprising:
- a convolutional encoder, wherein the convolutional encoder convolutionally encodes uncoded priming symbols, uncoded segment sync symbols, and data symbols;
- and,
- a symbol mapper, wherein the symbol mapper maps the convolutionally encoded priming symbols, segment sync symbols, and data symbols into corresponding multi-value symbols, and wherein the uncoded priming symbols condition the convolutional encoder and the symbol mapper to output coded segment sync symbols having predetermined values.
Dependencies are inferred from the claim text.