| 摘要 |
PROBLEM TO BE SOLVED: To easily restore an encoded signal by providing a decoding device with a bit determination means and a bit metric supplying means and determining the 1st bit of a data symbol based on two bit metrics. SOLUTION: A demap 110 consists of a hard decision block 130 and a bit metric decision block 140. The block 140 determines two bit metrics METRIC1, METRIC2. These two bit metrics METRIC1, METRIC2 are used for decoding a 1/2 binary convolution code. Namely a Viterbi decoder 120 receives these two metrics METRIC1, METRIC2, decodes the convolution code by using soft decision algorithm and generates a restored code X1'. An error can be efficiently corrected by using the decoder 120. The restored MSB X2' and LSB X1' are supplied to a succeeding processing block in a GA HDTV encoding device to process them. |
