Because the microphones used for filming could not pick up more than dialogue, other sounds had to be added in after the film was shot.

Suddenly, the outside microphone picked up a low, humming sound.

And then there came a muffled sound, picked up by the outside hull microphones.

The microphone, wedged into the range of the next booth, was picking up the conversation.

The other problem is that if you use headphones, the microphone will not pick up the signal.

But the microphone picked up something besides her voice.

A microphone picked up the sounds and brought them here.

The very close microphone picked up even slight quivering in her sound.

"You should speak your proposal louder, to be sure that the microphones pick it up."

The microphones, sensitive as they were, could barely pick up his voice.