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iTV DICTIONARY
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The following
is a list terms commonly used in the interactiveTV industry. If you
find any incorrect information to be incorrect or outdated, please email
us to correct.
**Note:
There are many different kinds of interactive TV technologies and services.
The definitions below will clarify and help you differentiate between
such things as "enhanced TV", "individualized TV", "hypervideo", "NetTV",
"personal TV", and may other terms.
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ADSL
Asymmetrical Digital Subscriber Line. ADSL is type of DSL that provides
T1 rates or higher in the downstream (towards the customer) direction
and 64 kbps or higher in the upstream direction.
ADVANCED TELEVISION ENHANCEMENT FORUM
(ATVEF)
A commercial technology organization or "cross-industry alliance"
formed by many different companies from the broadcast and cable
networks, television transports, consumer electronics, and PC industries.
The goal is to develop HTML-based protocols to promote the standardization
of enhanced TV. Tools and other supportive technologies that will
be "ATVEF-compliant" will enable the creation and distribution of
enhancements through the analog and digital signal. The URL for
the organization is: ATVEF
ANALOG
Analog data is expressed in the form of continuously variable waves
(e.g. amplitude or frequency of sound waves or electromagnetic waves).
Susceptible to noise and are not easily compressible.
ARPANET
Advanced Research Projects Agency Network. DARPA was founded in
1957 in response to a successful launch of a Russian satellite.
ARPANET was a project intended to maintain communications within
the country via important government computers in the eventual threat
of nuclear war.
ASPECT RATIO
The width-to- height ratio of the picture frame. TV broadcasts at
a 4:3 (1.33:1) aspect ratio; digital TV will be broadcast with a
16:9 (1.78:1) ratio; and most feature films are shot in at least
a 1.85:1 ratio.
ATM
Asynchronous transfer mode. A high speed data transmission and switching
technique that uses fixed size cells to transmit voice, data, video
which greatly increases the capacity of transmission paths, both
wired and wireless. |
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Definitions
provided by:
InteractiveTV Today 
