PHILIPPE PLAILLY / SCIENCE PHOTO LIBRARY PHILIPPE PLAILLY / SCIENCE PHOTO LIBRARY
High-definition television (HDTV): studio set at the 1989 Montreux International Symposium, with a Sony HDTV camera in foreground. An HDTV image resembles that of the cinema screen, both in terms of format and resolution. HDTV images are composed of 1,125 horizontal lines (compared to the 625 lines currently used in Europe). The picture is wider, with a width to height ratio of 5/3; in current systems it is 4/3. Current TV systems throughout the world utilise different broadcast standards such as PAL, NTSC, & SECAM. A similar diversity applies to HDTV, with the creation of a world HDTV standard unlikely before the year 2000.
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