…Coaxial cables have a structure that makes it difficult for electromagnetic waves to leak out (see figure), and are therefore capable of transmitting high frequencies of several hundred MHz, making them widely used as broadband transmission lines for telephone lines and cable television lines. Since the theory of coaxial transmission lines was published by L. Espenshied and others from the United States in 1934, balanced cables have attracted attention. Research on balanced cables began in Japan in 1937, and the C-4M system (960 telephone channels), which used a 9.5 mm standard coaxial cable, was first introduced in 1956 as a large-capacity carrier multiplexing system. … *Some of the terminology that mentions "Espenseed, L." is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…同軸ケーブルは,外部に電磁波が漏れにくい構造(図)となっているため,数百MHzの高い周波数を伝送できる特徴があり,電話回線をはじめとし,有線テレビジョン回線など広帯域伝送線路として広く用いられている。1934年アメリカのエスペンシードL.Espenshiedらによる同軸伝送線路の理論が発表されて以来,平衡形ケーブルが注目されるようになった。日本でも37年から研究が始められ,56年に大容量搬送多重方式として9.5mm標準同軸ケーブルを用いたC‐4M方式(電話960チャンネル)がはじめて導入された。… ※「エスペンシード,L.」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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