Digital television (DTV) is the transmission of audio and video by digitally processed and multiplexed signal, in contrast to the totally analog and channel separated signals used by analog television. It is an innovative service that represents a significant evolution in television technology since color television in the 1950s.There are four different widely used digital television terrestrial broadcasting standards:
- Advanced Television System Committee uses eight-level vestigial sideband for terrestrial broadcasting. This standard has been adopted by six countries, United States, Canada, Mexico, South Korea, Dominican Republic and Honduras.
Satellite television is television programming delivered by the means of communications satellite and received by an outdoor antenna, usually a parabolic reflector generally referred to as a satellite dish, and as far as household usage is concerned, a satellite receiver either in the form of an external set-top box or a satellite tuner module built into a television set
How to use it - You must have an ariel place near or around the part of the house wear signal can be picked up but not too far as the lead from the ariel needs to be plugged into the TV.
Pros - High bandwidth, Coverage over a large geographical area, Can be cheaper over long distances
Cons - High initial cost, noise and interference, propagation delay.
Interactive (iTV, interactive TV)
Definition -Interactive television (also known as ITV or iTV) is a form of media convergence, adding data services to traditional television technology. Throughout its history, these have included on-demand delivery of content, as well as new uses such as online shopping, banking, and so forth.
Cons - However, as of the present day, it offers limited benefits in the workplace as it is targeted mainly for consumer use. Therefore, it is not cost effective to replace existing internet technologies such as computers with web conferencing, with iTV.
Pros: offers more channels, high quality image, high quality sound.
Analog (or analogue)
is the analog transmission that involves the broadcasting of encoded analog audio and analog video signal one in which the information to be transmitted, the brightness and colors of the points in the image and the sound waves of the audio signal are represented by continuous variations of some aspect of the signal
Pros - More accurate and uses less bandwidth
Cons -The effects of random noise can make signal loss and distortion impossible to
Pay Per View:
This is a type of pay television service by which a subscriber of a television service provider can purchase events to view via private telecast. The broadcaster shows the event at the same time to everyone ordering it. Events can be purchased using an on-screen guide, an automated telephone system.
pros: this means that you don't have to continually pay for a channels. you only have to pay for the one program or film that you want to watch.
cons: sometimes the cost of one film may be quiet expensive. you can only watch one program or film when it is shown, not whenever you want to sit down and watch it.
is multimedia that is constantly received by and presented to an end user while being delivered by a provider. The Verb "to stream" refers to the process of delivering media in this manner; the term refers to the delivery method of the medium rather than the medium itself.
High-definition, sometimes abbreviated as Hi-def or HD, commonly refers to an increase in display or visual resolution over a previously used standard.
pros: this gives the viewer a better quality picture making it more exciting to watch.
3D television (3DTV) is TV that conveys depth perception to the viewer by employing techniques such asstereoscopic display, multi-view display, 2D-plus-depth, or any other form of display. Most modern 3D television set use an active shutter 3D system and polarized 3D system.
pros: this makes the program or film a lot more realistic coming out of the screen this interacts with the audience more giving of a different feel to the action within a film.
cons: the glasses that are needed to watch 3D can be irritating and annoying, you cannot watch 3D without the glasses.
A smart TV, sometimes referred to as connected TV or hybrid TV, is a television set or set top box with integrated Internet and Web 2.0 features, and is an example of technological coverage between computers and television sets and set-top boxes.