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1873年,美国人莫尔斯发明了电报,用电传输了文字信息;1876年,美国人贝尔发明了电话,用电传输了声音;1924年,英国人贝尔德发明了电视机,用电传输了图像。电报、电话和电视都是用无线电或有线电传输信息,电通信作为信息传输的有效通道,一直沿用了一个多世纪。
In 1873, the United States Morse invented the telegraph, the transmission of text messages by electricity; in 1876, the United States invented the telephone Bell, electricity transmission of sound; in 1924, the English Baird invented the television, electricity transmission The image. Telegraphs, telephones and televisions all use radio or wire to transmit information. As an effective channel for information transmission, electrical communications has been used for more than a century.