Noisy environments with background sounds.

背景声音嘈杂的环境。

youdao

Turn off: The background sounds can be turned off.

关闭：背景音可以被关闭。

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No background: The audio does not contain background sounds.

没有背景音：音频不要包含背景音。

youdao

But it also amplified many distracting background sounds as well.

WSJ: Testing, Testing...Can You Hear Better Now?

The sounds would need to be detectable under a wide range of street noises and other ambient background sounds when the vehicle is traveling under 18 miles per hour.

ENGADGET: NHTSA details new sound requirements for hybrids and EVs travelling under 18 mph

When I travel I have Classic FM streaming in the background and it sounds fine.

FORBES: In Praise Of...The Netbook?