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Digital TV set-top box
Interactive television (generally known as iTV) describes a number of techniques that allow viewers to interact with television content as they view it.
Contents
1 Definitions of Interactive Television
2 Return path
3 Forms of interaction
3.1 Interactivity with a TV set
3.2 Interactivity with TV program content
3.3 Interactivity with TV-related content
3.4 Examples of Interactive TV
4 User Interaction
5 Interactive television projects
6 Interactive Video and Data Services
7 References
8 See also
9 External links
//
Definitions of Interactive Television
Interactive television represents a continuum from low interactivity (TV on/off, volume, changing channels) to moderate interactivity (simple movies on demand without player controls) and high interactivity in which, for example, an audience member affects the program being watched. The most obvious example of this would be any kind of real-time voting on the screen, in which audience votes create decisions that are reflected in how the show continues. A return path to the program provider is not necessary to have an interactive program experience. Once a movie is downloaded for example, controls may all be local. The link was needed to download the program, but texts and software which can be executed locally at the set-top box or IRD (Integrated Receiver Decoder) may occur automatically, once the viewer enters the channel.
Return path
To be truly interactive, the viewer must be able to alter the viewing experience (eg choose which angle to watch a football match), or return information to the broadcaster.
This “return path” or “back channel” can be by telephone, mobile SMS (text messages), radio, digital subscriber lines (ADSL) or cable.
Cable TV viewers receive their programs via a cable, and in the integrated cable return path enabled platforms, they use the same cable as a return path.
Satellite viewers (mostly) return information to the broadcaster via their regular telephone lines. They are charged for this service on their regular telephone bill. An Internet connection via ADSL, or other, data communications technology, is also being increasingly used.
Interactive TV can also be delivered via a terrestrial aerial (Digital Terrestrial TV such as ‘Freeview’ in the UK). In this case, there is often no ‘return path’ as such - so data cannot be sent back to the broadcaster (so you could not, for instance, vote on a TV show, or order a product sample) . However, interactivity is still possible as there is still the opportunity to interact with an application which is broadcast and downloaded to the set-top box (so you could still choose camera angles, play games etc).
Increasingly the return path is becoming a broadband IP connection, and some hybrid receivers are now capable of displaying video from either the IP connection or from traditional tuners. Some devices are now dedicated to displaying video only from the IP channel, which has given rise to IPTV - Internet Protocol Television. The rise of the “broadband return path” has given new relevance to Interactive TV, as it opens up the need to interact with Video on Demand servers, advertisers, and web site operators.
Forms of interaction
The term “interactive television” is used to refer to a variety of rather different kinds of interactivity (both as to usage and as to technology), and this can lead to considerable misunderstanding. At least three very different levels are important (see also the instructional video literature which has described levels of interactivity in computer-based instruction which will look very much like tomorrow’s interactive television):
Interactivity with a TV set
The simplest, Interactivity with a TV set is already very common, starting with the use of the remote control to enable channel surfing behaviours, and evolving to include video-on-demand, VCR-like pause, rewind, and fast forward, and DVRs, commercial skipping and the like. It does not change any content or its inherent linearity, only how users control the viewing of that content. DVRs allow users to time shift content in a way that most VCR owners never learned to do. Though this form of interactive TV is not insignificant, critics claim that saying that using a remote control to turn TV sets on and off makes television interactive is like saying turning the pages of a book makes the book interactive.
Interactivity with TV program content
Screenshot of a OpenTV program browser set-top box resident software
Screenshot of a OpenTV email browser set-top box resident software
In its deepest sense, Interactivity with TV program content is the one that is “interactive TV”, but it is also the most challenging to produce. This is the idea that the…(and so on)
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