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Database
A database collects information into an electronic file,
for example a list of customer addresses and associated
orders. Each item is usually called a 'record' and the
items can be sorted and accessed in many different ways.
Dedicated
advertiser location (DAL)
A visually rich site that enables advertisers to provide
a greater depth of product information interspersed with
dramatic video content, textual information and a built-in
response mechanism.
Dial-up
Connection to a network using a modem and a standard telephone
line.
Digital
cable (DCable)
Digital services pass between the cable operator and the
viewer's home via fibre-optic cable laid below the ground.
Digital
Comb Filter
Clear separation of the combined colour and black and
white signals, preventing smudging, vibrating edges and
ensuring precise details.
Document
Management Systems
The control of electronic documents, such as images, spreadsheets
and word-processed files. A document management system
is created by combining several types of software to control
document identification, storage, retrieval, tracking,
version control, workflow management and presentation.
Good systems can create, use and control documents across
different computers, software packages and company divisions.
Domain
name
A convention used to allocate and structure the Internet
hierarchy into meaningful sections. For example, at the
higher level are the com, org, uk and net domains, which
can then be broken down into further domains such as scottish-enterprise.com,
scotent.co.uk, etc.
Downstream
The capacity of a network reserved for carrying information
from a server, exchange or controller to the user.
Dynamic
Quadra Focus
Technology on projection TVs which ensures clarity to
the very edges of the screen
Dynamic
Range
This is the difference between the lightest and darkest
parts of the image. If an image has very bright highlights
and very dark shadows, as well as everything in between,
it is said to have a wide dynamic range. This can cause
problems for some digital cameras.
