Channel coding scheme for 34 in HDTV digital VCR

✍ Scribed by Shoji Kitaori; Chosaku Noda; Takanori Furusawa

• Publisher: Elsevier Science
• Year: 1993
• Tongue: English
• Weight: 359 KB
• Volume: 5
• Category: Article
• ISSN: 0923-5965
• DOI: 10.1016/0923-5965(93)90007-g

✦ Synopsis

The authors have developed an experimental ¼ in HDTV digital videocassette recorder (VCR). The VCR can record HDTV digital base-band signals for more than 64 min on a ¼ in metal particle (MP) tape. An eight-to-eight modulation (8/8M) scheme has been developed for this VCR to realize high-density recording. In order to suppress sufficiently the low-frequency components and reduce the occurrence probability of long run-lengths for the recording data sequence, a new conversion table and bit-rearrangement method have been introduced in this modulation scheme. This conversion table has been particularly . . . . . It structured to reduce run-length using the bit-rearrangement process. Three kinds of typical HDTV images were used to evaluate the performance compared with the scrambled-NRZ method. The run-length distribution and the frequency spectrum were calculated for each image. The results showed that the occurrence probability of long run-lengths were well reduced and the low-frequency components along with the DC component were sufficiently suppressed. Cross-talk interferences and overwriting noises were also found to be much less than those for the scrambled-NRZ method.