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21. GLOSSARY
AAC
Advanced Audio Coding (AAC) is a lossy compression
and encoding scheme for digital audio. Audio files that
have been encoded with AAC generally achieves better
sound quality than MP3 at similar bit rates.
AACS
Advanced Access Content System (AACS) is the
content protection scheme used with Blu-ray™ discs.
Analog Audio
An electrical signal that directly represents sound.
Compare this to digital audio which can be an electrical
signal, but is an indirect representation of sound. Also see
“Digital Audio”.
Aspect Ratio
The width of a TV screen relative to its height.
Conventional TVs are 4:3 (in other words, the TV screen
is almost square); widescreen models are 16:9 (the TV
screen is almost twice as wide as its height).
AVCHD
AVCHD is a new format for high definition video camcorders
which can record and play high-resolution HD images.
BD-Live™
BD-Live™ is a BD-video (BD-ROM version 2 Profile
2.0) which contains new functions (e.g. Internet
connection), in addition to the BONUSVIEW™ function.
Blu-ray Disc™
Blu-ray Disc™ is a next generation optical video disc which
is capable of storing much more data than a conventional
DVD. The large capacity makes it possible to benefit from
the features such as high-definition videos, multi-channel
surround sounds, interactive menus and so on.
Chapter
Just as a book is split up into several chapters, a title
on a BD-video or DVD-video is usually divided into
chapters. Also see “Title”.
Digital Audio
An indirect representation of sound by numbers. During
recording, the sound is measured at discrete intervals (44,100
times a second for CD audio) by an analog-to-digital converter,
generating a stream of numbers. On playback, a digital-to-
analog converter generates an analog signal based on these
numbers. Also see “Sampling Frequency” and “Analog Audio”.
DLNA (Digital Living Network Alliance)
DLNA is a cross-industry organization of consumer
electronics that formulates DLNA Interoperability Guidelines
for sharing digital contents within a home network.
DNS Server
A server which translates Internet domain names into IP addresses.
Dolby
®
Digital
The system to compress digital sound developed by
Dolby Laboratories. It offers you sound of stereo (2ch)
or multi-channel audio.
Dolby Digital Plus
Dolby Digital Plus is the next generation digital audio
compression technology developed as an extension to
Dolby Digital. Blu-ray Disc™ supports 7.1 multi-channel
surround sound output.
Dolby TrueHD
Dolby TrueHD is a lossless coding technology developed
for next generation optical discs. Blu-ray Disc™ supports
7.1 multi-channel surround sound output.
DTS
®
(Digital Theater System)
DTS
®
is a multi channel surround sound system. You can enjoy
movie dynamic and realistic sound like movie theater. DTS
surround sound technologies were developed by DTS, Inc.
DTS-HD
®
DTS-HD
®
is a lossless coding technology developed as an
extension of the original DTS Coherent Acoustics format. Blu-
ray Disc™ supports 7.1 multi-channel surround sound output.
Gateway
IP address of the electronic devices (such as router)
which provide Internet access.
HDMI (High-Definition Multimedia Interface)
A digital interface between audio and video source. It
can transmit component video, audio, and control signal
with one cable connection.
Hub
A device used for connecting multiple device to the network.
IP Address
A set of numbers which are assigned to devices
participating in a computer network.
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