Carrier (English spelling)

Japanese: キャリア（英語表記）carrier

Carrier. (1) In telecommunications, this refers to a carrier wave. Signals such as audio and video signals transmitted by wire or wirelessly are of audible frequency or have special waveforms and are not suitable for transmission as is. Therefore, these signals are transmitted by applying changes to a high-frequency sine voltage (or current, electromagnetic wave) that is stable in both amplitude and frequency, in accordance with the signal (a process called modulation). In this case, the high-frequency sine voltage that is the carrier of the signal is called a carrier wave. (2) Something that contributes to electrical transmission within a semiconductor. This refers to the electrons (free electrons, which have a negative charge) and holes (also called holes, which are considered to be positively charged charged particles) within crystals of germanium or silicon.

Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information

Japanese:

担体。 (1) 電気通信では，搬送波をいう。有線または無線による音声，映像などの信号は可聴周波数や特殊波形のため，そのままの送信には適さないので，この信号の伝送は，振幅，周波数とも安定な高周波正弦電圧 (または電流，電磁波) に，信号に応じた変化を与えること (変調という) によって行うが，この場合の信号のにない手となる高周波正弦電圧を搬送波 (キャリア) という。 (2) 半導体内で電気伝送に寄与するもの。ゲルマニウムやシリコンの結晶内の電子 (自由電子。負の電荷をもつ) および正孔 (ホールともいう。正の電荷をもつ荷電粒子とみなされる) をいう。

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