Viterbi decoder for a high definition television
First Claim
1. A Viterbi decoder for a high definition television (HDTV) comprising:
- metric calculating means for obtaining a difference value between a signal input to the Viterbi decoder and a branch value and adding the obtained value with to an accumulated previous metric value;
optimal path calculating means for outputting information on a survival path for a stage and an optimal survival path within an observation section using the metric value output from said metric calculating means; and
path transition history calculating means for determining the value to be output within an observation section by setting in- and out-pointers from the path information output from said optimal path calculating means.
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Abstract
A Viterbi decoder for receiving and decoding a signal transmitted through a transmission channel in a vestigial side band (VSB) transmission system, in a high definition television (HDTV), which operates at the same speed as a symbol rate, can simply accomplish a hardware implementation using simplified memory system and a single decoder in order to restore an encoded signal, compared to the conventional art in which 12 decoders are used in restoring the encoded signal. Also, since the memory configuration thereof is regular, when it is intended to extend the observation sections, the memory structure can be extended easily. Moreover, the present invention can be adopted by extending easily to 3-bit 8 state or above as well as to 2-bit 4-state by means of a general Viterbi decoding algorithm.
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Citations
16 Claims
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1. A Viterbi decoder for a high definition television (HDTV) comprising:
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metric calculating means for obtaining a difference value between a signal input to the Viterbi decoder and a branch value and adding the obtained value with to an accumulated previous metric value; optimal path calculating means for outputting information on a survival path for a stage and an optimal survival path within an observation section using the metric value output from said metric calculating means; and path transition history calculating means for determining the value to be output within an observation section by setting in- and out-pointers from the path information output from said optimal path calculating means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A Viterbi decoder for a high definition television (HDTV) comprising:
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metric calculating means for obtaining a difference value between a signal input to the Viterbi decoder and a branch value and adding the obtained value to an accumulated previous metric value; optimal path calculating means for outputting information on a survival path for a stage and an optimal survival path within an observation section using the metric value output from said metric calculating means; and path transition history calculating means including a plurality of memory blocks, each enabled by the optimal survival path information output from said optimal path calculating means, for storing the information on the survival paths of respective states corresponding to respective observation sections and outputting the result of the final path transition history. - View Dependent Claims (13, 14, 15, 16)
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Specification