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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find any incorrect information to be incorrect or outdated, please email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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HEADEND
The electronic control center of a cable television system- generally
located at the antenna site of CATV system. The headend takes incoming
signals and amplifies, converts, processes, and combines them into
a common coaxial or optical cable for transmission to cable subscribers.
HIGH BIT RATE DIGITAL SUBSCRIBER
LINE (HDSL)
HDSL is a type of DSL that Transmits 2 Mbps bi-directional signals
over one or two twisted copper pairs. HDSL is used in applications
such as corporate Internetworking, video conferencing, and remote
data center access.
HIGH-DEFINITION TELEVISION (HDTV)
A higher quality signal resolution using a digital format for the
transmission and reception of TV signals. The HDTV provides about
five times more picture information (picture elements or pixels)
than conventional television, creating clarity, wider aspect ratio,
and digital quality sound.
HOST
Any computer on a network that offers services or connectivity to
other computers on the network. A host has an IP address associated
with it.
HYBRID FIBER-COAXIAL
(HFC)
A local cable TV or telephone distribution network. An HFC consists
of fiber optic trunks ending at neighborhood nodes, with coaxial
cable feeders and drop lines downstream of the nodes.
HYPERVIDEO
A type of interactive television technology invented by a company
called Veon located in San Francisco, California.
Hypervideos are, essentially, digital video clips embedded with
hotspots and markings, links to the Web or to other movies and media
formats, and/or other triggers leading the viewer in different directions.
Veon has created authoring and backend tracking tools that allow
the content producer to create these clips using complex object
tracking and key frame interpolation algorithms and then track in
detail how viewers interact with them. In some ways, this technology
is closer to the ideal realization of interactive TV as it allows
the fabric of the video to become completely dynamic. At the moment,
this technology is only available over digital broadband networks.
A competitor, IsurfTV, develops similar
technology; although, their authoring tools focus on key frame interpolation
and 3D techniques .
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Definitions
provided by:
InteractiveTV Today 
