high-definition television hdtv dtv atsc

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There is precedence for both compatibility and simultaneous hdtv broadcast. In 1957, the US chose compatibility when developing the color TV standard. Although there were some minor carrier interference problems due to the additional chrominance signal -- to a large extent, both monochrome and color TVs could read the same signal. hdtv


As a example of simultaneous hdtv broadcast, consider Britain. Monochrome broadcast began in Britain in 1936 with a 405 line standard. In 1967, the 625 line PAL color standard was introduced. The color and monochrome standards then operated in parallel for fifty years. In 1986, when the 405 line service was terminated, so few 405 line monochrome monitors remained that it was seriously considered that Parliament simply purchase 625 line monitors for the remaining 405 line users, as that was considerably cheaper than maintaining the 405 line service. (This amusing idea did not happen however, due to possible political repercussions!)

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