What is the difference between HD TV, Digital TV and Analog TV?
Analogue television uses a single radio-frequency carrier to deliver each television channel. The method of modulation of the carrier wave will vary according to the frequency and national television standards. But the actual “intelligence” is in an analogue form. That is: the brightness, colour, line and field synchronisation, and sound information are all delivered by a complex Composite signal. The television tuner just has to find the carrier frequency for the tv channel that you want and other circuits within the tv set will sort out the various components. Digital television uses the same range of radio (UHF or VHF) frequencies as analogue but the “intelligence” signals are transmitted as a string of digital pulses superimposed on a carrier frequency. The strings of pulses are grouped into bunches called packets. The packets contain similar picture and sound information as the analogue transmissions.
There is no difference between HD TV and digital tv as HDTV is a feature of digital tv that can transmit High definition tv signals antd therfore they are called HDTV. The difference between Analog TV and Digital TV boils down to the way the TV signal is transmitted. Standard analog TV is transmitted in a manner similar to radio. In addition, the amount of bandwidth assigned to an analog TV channel restricts the resolution and overall quality of the image. Digital TV, or DTV, on the other hand, is transmitted as data bits of information, just as computer data is written or the way music is written on a CD. Digital tvs can broadcast more features like addidtinal video, audio and text signals and provides better quality.
