US 5,844,945 A · Viterbi decoder for a high definition television

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.

Claims16

Dependent claims

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.

1 more element

Dependencies are inferred from the claim text.

Viterbi decoder for a high definition television

Life of this patent

Viterbi decoder for a high definition television

Life of this patent

Abstract

Claims16