Since 1927 when Philo Farnsworth invted the first working televison, times have changed immesnly as now we can get big 50" plasma and LCD TV's and the latest TV the 3D Televison.
3D TV's
In 3D TV's there are several techniques to produce and display 3D moving pictues, it is to display offest images that are filterd seperatly to the left and the right eye. Two strategies were used to complete it as you have to wear the eyeglasses to filter the separatly offest images to catch the eye so yo can see in 3D. In my oppinion i cant see 3D Televison taking of big as i thinks it okay without 3D obivously it would be really good to watch 3D-tv or play xbox or playstion games on them, but i dont think its worth the extra £££ when you can pay a little less for HD which is just as good.
http://www.youtube.com/watch?v=9xff4eEv8hM
Lenses:
Anaglyphic 3D( with passive red-cyan lenses)
Polarization 3D (with passive polarized lenses)
Alternate-frame sequencing (with active shutter lenses)
Head-mounted display (with a seperate display positioned in front of each eye, and lenses used primarily to relax eye focus)
Without lenses;
Autostereoscopic displays, sometimes referred to commerically as Auto 3D.
Satellite TV.
Satellie televison is televison programming deliverd by the means of communications sateillite which is recived to your antenna/satellite dish outside your house which sends signals to your freeveiw box or sky etc. In many areas of the world satellte televsion provides a wide range of channels and serivces. Aswell as direct broadcast satellite televison comes to the general pubic in two different types; analog and digital, the necessitates either having an analog satellite reciver or a digital satellite reciver.Cable TV.
cable televison is source that is providing televison programmes to consumers through radio frequency signals that are tranmitted to televison screens through coaxial cables or digital light pulses through optic fibers on the subscribers property, most televison sets are cable ready and have a cable televison tuner capable of receiving cable TV already built in. to get premium TV most televisons require a set top box like Virgin media etc, in a way cable is better via singal wise as when we get bad weather satellite TV can have no signal due to the weather, where as cable TV the weather will not effect you veiwing.
HD televison.
HDTV is a video that had a resolution substantially higher than that compared to normal plasma televisons etc. HDTV has one or two million pixles per frame. HDTV can be recorded to D-VHS to and HDTV capable digital video recorder, or HDTV ready HTPC, some cable boxes are also capable of receving o0r recording two or more broadcasts at a time in HDTV format. As good as HDTV you can just still have all the channels you want just without that better quality and with Sky HD there onaly a variety of channels which do HD.
On demand.
On demeand has been a latest kind of catch up TV where you can watch Tv online over BBC Iplayer, ITVplayer, but the only bad thing is that you are able to lie about your age cause all it takes is a clikc saying yes so a for example a 10 year old could watch and rated 18 programme just with a click of a button.Video on Demand (VOD) or Audio and Video On Demand (AVOD) are systems which allow users to select and watch/listen to video or audio content on demand. IPTV technology is often used to bring video on demand to televisions and personal computers
http://www.bbc.co.uk/iplayer/
http://www.itv.com/ITVPlayer/
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