WHETHER YOU USE IT TO catch the news, distract the kids or channel-surf from the depths of a couch, that television in the corner hasn't changed much since the leap from black-and-white to color. Computers zap e-mails and video clips across the globein digital bits and bytes, and mobile phones connect us digitally, too. Yet for the most part, television broadcasters still transmit sound and pictures with the same old analog signal they've used since the day the Beatles first appeared on "The Ed Sullivan Show."
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