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Glossary
AVCHD
The AVCHD format is a high-definition digital
video camera format used to record SD
(standard definition) or HD (high definition)
signals of either the 1080i specification* or the
720p specification** on DVDs, using efficient
data compression coding technology. The
MPEG-4 AVC/H.264 format is adopted to
compress video data, and the Dolby Digital or
Linear PCM system is used to compress audio
data. The MPEG-4 AVC/H.264 format is
capable of compressing images at higher
efficiency than that of the conventional image
compression format. The MPEG-4 AVC/H.264
format enables a high definition (HD) video
signal shot on a digital video camera recorder to
be recorded on DVD discs in the same way as it
would be for a standard definition (SD)
television signal.
* A high definition specification that utilizes 1080
effective scanning lines and the interlace format.
**A high definition specification that utilizes 720
effective scanning lines and the progressive format.
BD-J application
The BD-ROM format supports Java for
interactive functions.
“BD-J” offers content providers almost
unlimited functionality when creating
interactive BD-ROM titles.
BD-R
BD-R (Blu-ray Disc Recordable) is a
recordable, write-once Blu-ray Disc, available
in the same capacities as the BD below. Since
contents can be recorded and cannot be
overwritten, a BD-R can be used to archive
valuable data or store and distribute video
material.
BD-RE
BD-RE (Blu-ray Disc Rewritable) is a
recordable and rewritable Blu-ray Disc,
available in the same capacities as the BD
below. The re-recordable feature makes
extensive editing and time-shifting applications
possible.
BD-ROM
BD-ROMs (Blu-ray Disc Read-Only Memory)
are commercially produced discs and are
available in the same capacities as the BD
below. Other than conventional movie and video
contents, these discs have enhanced features
such as interactive content, menu operations
using pop-up menus, selection of subtitle
display, and slideshow. Although a BD-ROM
may contain any form of data, most BD-ROM
discs will contain movies in High Definition
format, for playback on Blu-ray Disc/DVD
players.
Blu-ray Disc (BD)
A disc format developed for recording/playing
high-definition (HD) video (for HDTV, etc.),
and for storing large amounts of data. A single
layer Blu-ray Disc holds up to 25 GB, and a
dual-layer Blu-ray Disc holds up to 50 GB of
data.
Dolby Digital
In this format, the surround speakers output
stereo sound with an expanded frequency range,
and a subwoofer channel for deep bass is
independently provided. This format is also
called “5.1” with the subwoofer channel
designed as the 0.1 channel (since it functions
only when a deep bass effect is needed). All six
channels in this format are recorded separately
for superior channel separation. Furthermore,
since all the signals are processed digitally, less
signal degradation occurs.
Dolby Digital Plus
Developed as an extension to Dolby Digital, the
audio coding technology supports 7.1 multi-
channel surround sound.
Dolby TrueHD
Dolby TrueHD is a lossless coding technology
that supports up to 8 channels of multi-channel
surround sound for the next generation of optical
discs. The reproduced sound is true to the
original source bit-for-bit.