What is resolution of ntsc and s-video?

Answer 1

NTSC and S-video refer to different aspects of the television signal and neither defines the resolution. The three terms are often confused. A brief description of each is given below. NTSC is the standard used to encode color signals into a single signal. It is the standard adopted by North America and other parts of the world. The other major color standard is PAL, adopted by the UK and Europe and other countries. SECAM is a French system that is used in a very few countries. It is important to note that the standard refer only to the color encoding process and not the resolution of the image. All are strictly standard definition and never used for high definition signals. The encoded signal is known as composite video. S-video is based on the same color encoding standards mentioned above but uses two wires instead of the single composite signal. One wire carries intensity (or brightness) information and will show a black and white image if used by itself. The second wire is used for color information. The S-video interface gives the impression of a better signal quality because the intensity signal has a higher bandwidth than the intensity signal when encoded into a composite signal. Moving on to resolutions, North American television has a resolution of 640 pixels on each line with 480 lines making up a complete image. NTSC is wrongly used to refer to a 640 x 480 image running at 60Hz. European television runs at 50Hz and is made up of 576 lines. A slightly higher resolution is delivered at the expense of the the frame rate. Also wrongly, European resolutions are often referred to as PAL. It is worth pointing out that European signals can be encoded into an NTSC signal and North American signals into PAL. The original frequencies and resolutions are retained and only the color encoding changes. This technique has been used to allow a PAL only display to show North American material and NTSC displays to show European material. The technique is rarely used today as most dual standard displays are now true multi-standard and will handle either color encoding system. High definition television uses 720 line or 1080 line images. The same resolutions are used at both 50 and 60 Hz. PAL and NTSC encoding are not used in high definition broadcasting