HD-MAC was never designated for video interchange except by the European Broadcasting Union. Įurope developed HD-MAC (1,250 lines, 50 Hz), a member of the MAC family of hybrid analogue/digital video standards however, it never took off as a terrestrial video transmission format. All attempts at using this format for terrestrial TV transmission were abandoned by the mid-1990s. Attempts at implementing HighVision as a 6 MHz broadcast channel were mostly unsuccessful. HighVision video is still usable for HDTV video interchange, but there is almost no modern equipment available to perform this function. The NHK system was standardized in the United States as Society of Motion Picture and Television Engineers (SMPTE) standard #240M in the early 1990s, but abandoned later on when it was replaced by a DVB analog standard. The Sony HDVS system was presented at an international meeting of television engineers in Algiers, April 1981 and Japan's NHK presented its analog high-definition television (HDTV) system at a Swiss conference in 1983. Modern HD specifications date to the early 1980s, when Japanese engineers developed the HighVision 1,125-line interlaced TV standard (also called MUSE) that ran at 60 frames per second. Further information: Analog high-definition television system
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