There was a constant backdrop of machine noise and shouting that drowned out individual voices.

Standing there just outside the pressure hatch, Derec could hear a cacophony of machine noises?

Because anti-noise cancels only the machine noise, voices and other sounds, such as an an alarm bell, can still be heard.

Even the shot sounded quiet against the overlay of machine noise.

There was no sound, no humming, no machine noises, just the light.

Flash memory has no moving parts, so there is no danger of the microphone's picking up machine noise.

They hear a machine noise which is discovered to be a tank.

Perhaps he ignored the machine noises because the ornithopter on which they had arrived made such a racket itself.

The machine noise often proves invaluable in analyzing accidents.

For example, an exhibition may be enhanced with topical ambient sound of water, birds, train or machine noise.