… Noise in radio receivers and other wireless devices and audio equipment is divided into internal noise and external noise depending on the cause of its generation. Internal noise is generated inside receivers and other devices, and typical examples include thermal noise generated by resistors, shot noise generated by transistors, excess noise, flicker noise, and microphonic noise generated by vacuum tubes. Thermal noise, also known as Johnson noise, is noise generated by disturbance of electrons due to heat, and becomes stronger in proportion to temperature. … *Some of the terminology that refers to "excess noise" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
… 雑音は,ラジオ受信機などの無線機や音響機器などではその発生原因により,雑音を内部雑音と外部雑音に分けている。受信機などの内部で発生するものが内部雑音で,抵抗体の発生する熱雑音,トランジスターなどの発生するショット雑音,過剰雑音,フリッカー雑音,真空管の発生するマイクロホニック雑音などがこの代表的なものである。熱雑音は,ジョンソン雑音ともいい,電子の熱によるじょう乱によって生ずる雑音で,温度に比例して強くなる。… ※「過剰雑音」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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