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自1941年开始广播黑白电视,1951年广播彩色电视,四十余年以来,电视有了很大的发展。现在一全世界有电视机四亿多台,电视机已成为很多国家中家庭的必备品。彩色电视目前正用三种制式在全世界广播,双伴音、文字广播、静止图象在逐渐推广。在电视接收方面,新的技术如多功能、组合式、双画面,平板
Since 1941 broadcast black and white television, 1951 broadcast color television, more than 40 years, television has made great progress. Now that there are over 400 million televisions in the world, televisions have become a must for families in many countries. Color television is currently being broadcast throughout the world in three formats, with double-sounding, teletext and still images being gradually promoted. In television reception, new technologies such as multi-function, modular, dual-screen, tablet