TOKYO The DVD Forum has released a preliminary format for a HD DVD-ROM specification that targets the Chinese market.
The version 9.9 spec was unveiled at the DVD Forum Japan Conference 2006 here on Thursday (Oct. 5).
Chinese organizations, including the Optical Memory National Engineering Research Center and China Electronics Technology Group, requested that the DVD Forum compile a Chinese version of the HD DVD-ROM format. The forum's Working Group 11 for Blue-Laser DVD has been working on the format since early this year.
Physical specs mostly parallel current HD DVD-ROM specsa 12-cm disk with two 0.6-mm-thick platters and a single layer with 15-Gbyte capacity. Only the modulation codec differs. For the HD DVD family, ETM (8 data bit/12 channel bit modulation) is used, but the China-only version employs FSM (4 data bit/6 channel bit modulation) codec.
The Chinese groups apparently sought a different codec to isolate the Chinese version from the HD DVD format used elsewhere. The working group confirmed that ETM and FSM exhibit almost the same frequency characteristics.
Based on the physical format, the Chinese group plans to define a proprietary video format.
"We prepared the format. How the China-only specification is implemented is under discussion between China and the Forum's Steering Committee," said Yutaka Yamanaka, senior researcher at NEC's Optical Recording Technology Center. Yamanaka also chairs Working Group 11.
The format is scheduled to be completed by December and will be labeled: "HD DVD-ROM part1 Ver 10.0 for China only."