BBC celebrates 75 years of 'high definition' TV this weekend

Engadget - While you're enjoying all your 720- and 1080-line television broadcasts, this weekend it's time to reach back and remember the first "high-definition TV" that went into service at Alexandra Palace in London 75 years ago. Back in the '30s "HD meant an upgrade over the original systems, to resolutions of more than 240-lines. When the BBC debuted service (to some 400-odd viewers) it actually used two systems, one with 405 interlaced lines, and another mechanical system with 240 progressive lines of resolution.

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