microphone

A device (transducer) used to convert sound waves into a varying electric current; normally fed into an amplifier and either recorded or transmitted over radio.

• Behind the tangled garden of microphones that had sprouted on the lectern, Goldwater spoke softly and casually about his family.
• It rained hard through most of Roosevelt's Second Inaugural. Audio tape recordings of the speech feature the tattoo of the rain on Roosevelt's microphone[…]

A speaking trumpet or hearing trumpet; an acoustic device to concentrate or amplify sound.obsolete

To put one or more microphones on or in.transitive