[tig] [craigsmith at mac.com: [FVtech] Sony's new professional optical disc system]
Wed Jul 23 19:27:37 BST 2003
The following is an excerpt from Broadcast Engineering
Magazine for Jul 21 2003, meant for private discussion.
Sorry for any character-translation oddities in the
protocols I'm translating.
- colorist - TIG coadmin - founder etc.
Sony's new professional optical disc system
Beyond The Headlines [Broadcast Engineering],?Jul 21 2003
The new discs have a re-write cycle greater than a thousand
times and a 30-year archival life.
Later this year, Sony will begin delivering a new line of
broadcast products based on a single-sided optical disc. The
random access disc, using blue-violet laser technology,
represents a new professional storage medium capable of
extremely large-capacity recording.
The disc?equal in size to standard CD and DVD
media?provides a storage capacity of 23.3 GB?a feat made
possible using a 405 nm blue-violet laser and an object lens
with a 0.85 numerical aperture and specially developed
This translates to a recording time of 45 to 90 minutes,
depending on the bit rate the camera operator chooses.
Sony?s new professional optical disc is a flexible platform
on which an assortment of data in a variety of formats can
reside. The use of optical disc technology eliminates the
restrictions inherent in proprietary tape footprints.
The disc handles information as ?data files,? and is
therefore flexible as to what can be recorded on it. In
addition to video and audio streams, it can record a variety
of metadata, such as date/time/location information,
scripts, low-resolution video, and audio. The amount of
metadata used is completely up to the user, since the
information does not have to reside on a limited,
predetermined area of the disc.
For those who worry about the ruggedness of optical media in
field recording applications, Sony argues that the discs
have a natural advantage since they suffer no mechanical
contact during recording or playback. The new discs have a
re-write cycle greater than a thousand times and a 30-year
archival life. This makes them ideal for continuous use and
re-use. Weighing three ounces, the discs are also highly
resistant to dust, shock, water, heat, humidity, scratches
and airport x-rays, and are packaged in a durable, sealed
The new disc system?s high transfer rate and quick random
access make it ideal for facilities migrating toward an
infrastructure based on information technology (IT). The
nonlinear nature of the disc alone provides huge benefits
when handling audio/video content. When a recording is
played back, its physical location on the disc does not
impact the time required to access it. Recordings can be
accessed in a fraction of the equivalent time taken to
access information on tape, making it much easier and faster
to locate source material.
The professional optical disc?s data transfer rate is 72
Mb/s from a single optical head unit and 144 Mb/s on a dual
Sony?s upcoming introduction of the PDW series of optical
disc products represents a new gateway to a faster, more
cost-effective method for making video programs. These new
tools are designed to blur the walls now standing between
traditional AV and newer IT broadcast infrastructures. They
will introduce new advantages in random access, file
transfer, central storage and metadata. The PDW series of
optical recorders will allow the recording and playback of a
wide assortment of data, including MPEG IMX and DVCAM
streams, and low-resolution copies (proxy AV data). Sony
has a new term for it: ?workflow innovation.?
For more information, visit www.sony.com/broadcast .
----- End forwarded message -----
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