Multimedia applications it was mentioned in the

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Unformatted text preview: ndards Features NTSC PAL SECAM Scanlines/frame Scanning technique Refresh rate (frames/second) Aspect ratio Transmission Modulation Used in 525 Interlaced 29.97 625 Interlaced 25 625 Interlaced 25 4:3 4:3 Analog Analog AM AM US, Japan, and India and Western some Asian Europe (except countries France) Figure 19.6. Features of the three broadcast TV standards. 4:3 Analog FM France, Eastern 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 effort are 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 Features Scanlines/frame Refresh (frames/second) Transmission Modulation Media MUSE 1125 rate 60 HD-MAC 1250 50 Analog Analog FM FM Broadcasting Broadcasting satellite satellite Used in Japan Europe 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 devices): 1. A video camera is the most commonly used input device for capturing video data. 2. A video monitor (TV monitor or computer monitor) is the most commonly used output device for displaying video data. 3. A video board (or video card), which is equipped with A/D and D/A converters. In addition to performing the basic function of A/D and D/A conversions of...
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