Transmission theory - densouriron (English spelling) transmission‐line theory

Japanese: 伝送理論 - でんそうりろん（英語表記）transmission‐line theory

Transmission paths have imperfections that cause noise, crosstalk, loss, distortion, etc., impairing signal transmission. A theory that provides a general method for analyzing signal degradation due to imperfections in such transmission systems and clarifies the various factors that degrade signal transmission is called transmission theory. Below, we will explain the main degradation factors.
[Distortion]
The current or voltage waveform applied to the input side of a transmission system generally differs from the current or voltage waveform that appears on the output side. This deformation is called distortion, which can be broadly divided into linear distortion and nonlinear distortion.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

伝送路には雑音，漏話，損失，ひずみなどを生ずる不完全さがあり，信号伝送を損なう。こういった伝送系の不完全性に基づく信号の劣化の一般的な解析法を与え，信号の伝送を劣化させる各種要因を明らかにする理論を伝送理論という。以下，代表的な劣化要因について述べる。
［ひずみ］
　伝送系の入力側に加えられた電流，または電圧波形と，出力側に現れる電流，または電圧波形とは一般に異なる。この変形をひずみといい，直線ひずみと非直線ひずみの二つに大きく分けられる。

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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