There were four major HDTV systems tested by SMPTE in the late 1970s, and in 1979 an SMPTE study group released A Study of High Definition Television Systems:
ఎన్ని ప్రధాన HDTV వ్యవస్థలు SMPTE ద్వారా 70ల చివరలో పరీక్షించబడ్డాయి?
four