A microphone containing carbon granules, whose electrical resistance varies with pressure.

plural of carbon microphone

A means of delivering a speech to a large crowd, where the speaker says a few words at a time, and people within hearing of the speaker repeat it in unison. Used to work around police bans of electronic amplifiers.

A means of delivering a speech to a large crowd, where the speaker says a few words at a time, and people within hearing of the speaker repeat it in unison. Used to work around police bans of electronic amplifiers.

A type of contact microphone that absorbs vibrations directly from the wearer's throat, laryngophone.

plural of throat microphone

A microphone that uses a thin electrically conductive ribbon between the poles of a magnet to produce a voltage by electromagnetic induction.

plural of ribbon microphone

plural of hot microphone

(electronics, especially aviation) A microphone that is activated (but not powered) by the sound of the user's voice, allowing it to pick up speech without having to be manually turned on, while still rejecting background noise unaccompanied by speech.