31.   A country radio station provided background noise for the animal.

32.   A rallying point for a region, not just background noise.

33.   A solution was found by installing contact microphones on the instruments that picked up the vibrations directly from the strings, with little distortion but some background noise.

34.   After the new muffler made the car less noisy, the crunching sound changed from background noise and accompaniment to the muffler.

35.   But conversations within the cockpit are in Korean and are hard to hear because of background noise.

36.   But Ford came to realize that the background noise of passing ships was important too.

37.   But gradually Kerkorian and Chrysler faded into background noise against the blare of automotive America doing business.

38.   But like people chatting in a crowded room, whales seem to have the ability to pick out signals from the background noise, Payne says.

39.   But sometimes that is difficult because of background noise.

40.   Carrying on a conversation over background noise at parties and dinners was exhausting.