High-pitched ring tone

You know that strange ability you have (or once had) to know when a TV set was on, even if you were on another room and the sound was muted? That annoying distant sound that would sit on the back of your head? NY Times has an article on using that same high-pitched sound as cellphone ring tone to use in settings where cellphone use is forbidden. The mp3 for that sound is also available through the article.