What is DTV and HDTV (Digital TV and High Definition TV)?
If you know the basic principles of TV, then you will know all about what is now called analog TV. In analog TV, an analog signal carries intensity and colour information for each scan line of the picture. In about 1967 in Europe 625 scan lines were introduced and called the PAL standard. This level of resolution was amazing 50 years ago, but today it is rather passe. The lowest resolution computer monitor that anyone uses today has 640×480 pixels, and most people use a resolution like 800×600 or 1024×768. We have grown comfortable with the great clarity and solidity of a computer display, and analog TV technology pales by comparison. Many of the new satellite systems, as well as DVDs, use a digital encoding scheme that provides a much clearer picture. In these systems, the digital information is converted to the analog format to display it on your analog TV. The image looks great compared to a VHS tape but it would be twice as good if the conversion to analog didnt happen. There is no
