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Unformatted text preview: ndards Features NTSC PAL SECAM Scanlines/frame
Used in 525
US, Japan, and India and Western
Figure 19.6. Features of the three broadcast TV standards. 4:3
Europe, Russia, and
Middle East High Definition Television (HDTV)
HDTV emerged out of the desire to build a video system that could deliver a more
exciting viewing experience than that offered by current TV technologies. The
major goals in designing such a system were to provide for improved picture
resolution, improved color resolution, wide screen display, and large projection.
Two major broadcasting systems that have evolved for commercial use out of this
1. MUSE (Multiple SubNyquist Sampling Encoding) in Japan and
2. HD-MAC (High Definition Multiple Analog Components) in Europe.
The main features of these two systems are given in Figure 19.7. As shown in the
figure, the scanning parameters (scanlines/frame and refresh rate) are different for
the two systems. Standards
rate 60 HD-MAC
Figure 19.7. Features of the two HDTV standards.
Apart from broadcasting purposes, HDTV is used in industrial applications also.
Museums, film production, teaching, electronic billboards, and multimedia games
are some such applications.
Hardware Requirements for Video
The following hardware devices are generally required in a computer system
capable of handling video (see Chapter 9 for a description of some of these I/O
1. A video camera is the most commonly used input device for capturing video
2. A video monitor (TV monitor or computer monitor) is the most commonly
used output device for displaying video data.
A video board (or video card), which is equipped with A/D and D/A
In addition to performing the basic function of A/D and D/A
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- Spring '14