Television is a medium for recording and transferring images and sound from one point to another. The Image portion of the system is a light-To-light system, gathering variations in light at the source via pickup device such as a camera and recreating those variations in light as a visual image via a display device such as cathode ray tube (CRT). Television was initially intended for sports, news and entertainment applications and its now finding application in telecommunications as videoconferencing, for computing as desktop video, for medicine as telemedicine and in education as distance learning, because of this rapid application, digital television gives the development of accurate and detailed picture and sound.Digital Television does not imply digital transmission or reception of some new type of TV signal. The Television set tackle in this term paper receive conventional TV signals and produce corresponding pictures and sound which is superior in conventional Television. Digital Television came into being when ITT developed five Integrated circuit (ICs) that replace virtually all of the circuits between the tuner or what we called channel selector and the picture tube /audio amplifier section found in analog or conventional television set. The five digital ICs replace about 24 analog ICs in conventional television and this ICs are VLSI (Very Large Scale Integration) devices.The key factor to digital television is in analog to digital (A/D) and digital to analog (D/A) conversion. In the simplest terms, the analog signal which is the composite video and sound at the output of television tuner are converted to their digital equivalent by and analog to digital (A/D) process somewhat similar to that found in compact discs. The resultant digital signals are then processed to produce the corresponding video and audio in digital form.When the processing is complete, the digital signals are restored to analog form by digital to...
