Glossary - Philips HTS3378/93 User Manual

12 Glossary

A
Aspect ratio
Aspect ratio refers to the length to height
ratio of TV screens. The ratio of a standard
TV is 4:3, while the ratio of a high-defi nition
or wide TV is 16:9. The letter box allows you
to enjoy a picture with a wider perspective on
a standard 4:3 screen.
D
DivX®
The DivX® codec is a patent-pending,
MPEG-4 based video compression technology
developed by DivX®, Inc. It can shrink the
fi le size of digital video and still maintain high
visual quality.
Dolby Digital
A surround sound system developed by Dolby
Laboratories that contains up to six channels
of digital audio (front left and right, surround
left and right, centre and subwoofer.)
H
HDCP
High-bandwidth Digital Content Protection.
This is a specifi cation that provides a secure
transmission of digital contents between
different devices (to prevent unauthorised
copyright.)
HDMI
High-Defi nition Multimedia Interface (HDMI)
is a high-speed digital interface that can
transmit uncompressed high defi nition video
and digital multichannel audio. It delivers high
quality picture and sound quality, completely
free from noise. HDMI is fully backward-
compatible with DVI.
As required by the HDMI standard,
connecting to HDMI or DVI products without
HDCP (High-bandwidth Digital Content
Protection) will result in no Video or Audio
output.
J
JPEG
A very common digital still picture format.
A still-picture data compression system
proposed by the Joint Photographic Expert
Group, which causes only a small decrease in
image quality in spite of its high compression
ratio. Files are recognised by their fi le
extension '.jpg' or '.jpeg'.
M
MP3
A fi le format with a sound data compression
system. MP3 is the abbreviation of Motion
Picture Experts Group 1 (or MPEG-1) Audio
Layer 3. With the MP3 format, one CD-R or
CD-RW can contain about 10 times more
data than a regular CD.
MPEG
Motion Picture Experts Group. A collection
of compression systems for digital audio and
video.
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