...The telephone network has been able to grow to the global scale it is today thanks to the invention of amplifiers and the efficient use of transmission lines through multiplexing technology. The foundations of this include the invention of the triode vacuum tube by L. de Forest in 1906, the invention of the carrier telephone system by George Owen Squier (1865-1934) in 1910, the invention of the vacuum tube oscillator by Robert von Louis Hartley in 1915, and the completion of filter theory by George Ashley Campbell in 1917. The first system put into practical use as a communication transmission line was the bare wire system, which consisted of many copper wires strung around utility poles. ... *Some of the terminology that mentions "Campbell, GA" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…その電話網が今日の世界的な規模にまで発展し得たのは,増幅器の発明と多重通信技術による伝送路の効率的利用によるものといってよいであろう。その基礎となるものは,1906年のデ・フォレストL.de Forestによる三極真空管の発明,10年のスクワイアGeorge Owen Squier(1865‐1934)による搬送電話方式の発明,15年のハートリーRovert von Louis Hartleyによる真空管発振器の発明,17年のキャンベルGeorge Ashley Campbellによるフィルター理論の完成などであろう。 通信伝送路として最初に実用化された方式は電柱に多数の銅線を張りめぐらした裸線方式であった。… ※「キャンベル,G.A.」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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