Microsoft Corp. showed off a sound system at its Redmond, Wash., headquarters that confines music to a single spot in a room -- and no one else can hear it.

The software prototype, dubbed Personal Audio Space, processes digital music and plays it through speakers in such a way that sound waves cancel each other out everywhere except where you want them focused.

Someone even a few paces away from the designated sound field cannot hear the music, the newspaper says. Researchers see applications in office settings and at home, so people watching late-night television do not have to keep the sound down.

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