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Wednesday, May 21, 2008
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Flexible Optical Disc Offers Data Rates of 250Mbps
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Japanese researchers have developed a paper-thin optical
disc capable of spinning at 15,000 rpm, fast enough for
recording and reproduction at 250 Mbps.
Researchers of Japan Broadcasting Corporation (NHK)
showcased an 0.1mm thick optical disc - compatible with
conventional optical disk media - for high-speed and
large-capacity recording.
The thin, flexible substrate enables the disc to rotate
at 15,000 rpm, which is fast enough for recording and
reproduction at 250 Mbps (a rate equivalent to an HDTV
VCR for broadcasting).
Current optical disc systems are speed-capped at about
10,000 rpm. Faster rotating speeds may physically
disintegrate the disc.
In cooperation with the with Nagaoka University of
Technology, Engineers at the Science and Technical
Research Laboratories (STRL) of Japan's public
broadcaster have managed to accurately control the
optical beam tracking servo operation at the 15,000 rpm.
The new control method is based on a feed-forward scheme
that determines the position of optical beam by using
positioning data from the previous track.
The disc can be used to store and reproduce broadcast
quality HDTV signals at 250 Mbps. For comparison, a 1x
Blu-ray Disc records at 36Mbps.
The thin profile of the disc would also make it feasible
to install multiple disks in a cartridge to make a
large-capacity storage medium.
NHK plans to further increase the data transfer rate and
capacity of the optical disk for HDTV video archiving and
to replace magnetic tape as the video recording medium at
broadcasting stations.
The results of the ultra-thin optical disc research will
be showcased at the Open House 2008 show in Tokyo, Japan,
May 22~25. |
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