For example, a film-maker might opt to include the background sound of an ambulance's siren while the foreground sound and image portrays an arguing couple.

例如，电影制作人可能会选择在背景中加入救护车的警笛声，而在前景的声音和图像中表现一对争吵的夫妇。

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The microphone has noise canceling to diminish background sound, so people can hear you clearly when they are supposed to.

耳机的话筒内含背景降噪功能，让对方能如愿地听到您清畅的语音。

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Modulator mixes point sound signal output by its subordinate multiple detectors to background sound in the sub area and sends it to control unit to realize background sound reproduction.

控制单元将各子区域背景声音信号电平与各对应设置的子区域报警阈值电平比较，在某子区域背景声音信号电平大于该子区域所设置的报警阈值电平时控制告警。

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Background sound and chatter does interfere with the system making the retrieval of accurate information difficult.

BBC: NEWS | Technology | Google listens to screen routine

Watching the same show with Speech Enhancement made Dame Maggie Smith's character's words louder than the background music and other sound in a scene, so we didn't have to strain to hear.

WSJ: Review of Sonos Playbar: Raising the Bar for Better TV Sound

Without that public airing, the NIE could become one more sound in the background noise as the war grinds on, and the electorate looks for anything else to think about.

NPR: U.S. Iraq Policy: Going Down on One NIE?