noun
carbon microphone
Technical term for an early type of microphone that uses carbon granules to convert sound into electrical signals.
初期の電話機にはカーボンマイクロホンが使われていた。
Early telephones used carbon microphones.
Variant with interpunct; less common in running text.
General term for microphone; カーボンマイクロホン specifies the carbon type.
Loanword from English 'carbon microphone'.