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11 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-definition 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.
J
JPEG
A very common digital still picture format. A
still-picture data compression system proposed
by the Joint Photographic Expert Group, which
features small decrease in image quality in
spite of its high compression ratio. Files are
recognized by their file extension '.jpg' or '.jpeg. '
K
Kbps
Kilobits per second. A digital-data-rate
measurement system which is often used with
highly compressed formats such as AAC, DAB,
MP3 etc. The higher the amount, the better the
quality generally is.
Kensington lock
A Kensington Security Slot (also called a K-Slot
or Kensington lock). Part of an anti-theft system.
It is a small, metal-reinforced hole found on
almost all small or portable computer and
electronics equipment, particularly on expensive
and/or relatively light ones, such as laptops,
computer monitors, desktop computers,
gaming consoles, and video projectors. It is
used for attaching a lock-and-cable apparatus, in
particular those from Kensington.
M
Memory Stick
Memory Stick. A flash memory card for digital
storage on cameras, camcorders and other
handheld devices.
MMC Card
MultiMedia Card. A flash memory card that
provides storage for cellphones, PDAs and
other handheld devices. The card uses flash
memory for read/write applications or ROM
chips (ROM-MMC) for static information, the
latter widely used for adding applications to a
Palm PDA.
S
SD Card
Secure Digital Memory Card. A flash memory
card that provides storage for digital cameras,
cellphones and PDAs. SD Cards use the same
32 x 24mm form factor as the MultiMediaCard
(MMC), but are slightly thicker (2.1mm vs.
1.4mm), and SD Card readers accept both
formats. Cards up to 4GB are available.
T
Thumbnail
A thumbnail is reduced-size versions of a
picture that is used to make it easier to
recognize an them. Thumbnails serve the same
role for images as a normal text index does for
words.
EN
19
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