scanning is done to sample the image as digital information is more easy to be transmitted than the analog information...
There are four main principles for TV programming. The first is the evolution of the scanning process. The second is the development of television camera and receiver. The third is the development of color television. The last is broadcast, cable, and satellite television transmission.
To broadcast pictures, television stations use the methods of progressive and interleaf scanning. Make that interlace scanning.
you give answer this question
An odd number of lines are used in interlaced scanning because, in each field of the TV, the scanning displaces the field by a half of the area. If there were an even number of lines, it would flicker noticably.
Scanning the Skies The Discovery Channel Telescope - 2012 TV was released on: USA: 9 September 2012
To Ensure Interlaced Scanning
An HDTV should not eventually stop scanning for channels. Provided you have properly cared for your TV, this is not a common problem.
Television relates to the inventor John Logie Baird, a Scotsman who successfully demonstrated the first mechanical picture scanning by using amplifiers at both the transmission and reception points. The image could be sent by either ordinary telephone lines or radio waves, which led to the first trans-Atlantic transmission of television from London to New York in February, 1928. The term combines the Greek word 'Tele,' which means 'far,' with the word vision - view. Hence television.
A Nipkow disk (sometimes Anglicized as Nipkov disk; patented in 1884), also known as scanning disk, is a mechanical, geometrically operating image scanning device, invented by Paul Gottlieb Nipkow. This scanning disk was a fundamental component in mechanical television through the 1920s.
IR transmission type of transmission is used in television system .
Environmental scanning is important in international business because the needs of consumers change rapidly. With environmental scanning, a business can adapt to the market as necessary.
So you can get clear reception I guess and so its easy to watch tv i dont really no any other reasons good question