41.   Circuitry in the headphones samples the ambient noise and generates in each headphone a sound that cancels the background noise.

42.   Computers adjust the remarkable device to mute background noise and make even high-pitched voices audible.

43.   Depending upon volume and content, such sounds generally turn into background noise.

44.   Designers say that digital hearing aids will make it easier to filter out background noises and deliver more realistic sound.

45.   Disregard the dialogue, which could have been scripted by Don King, and listen to the background noise.

46.   Distractions turn into background noise instead of stressors.

47.   Even as the war has receded to background noise in his life, however, Olson keeps up with the debate within NATO on how to proceed.

48.   Even background noise from a television can lead them into a panic because their perception of reality becomes clouded, she said.

49.   First, an officer uses the sound meter to measure normal background noise in the area.

50.   For many, the coming electoral campaign is still just background noise, drowned out by more urgent concerns over the simmering ethnic tensions.