Learning About White Noise

A lady come in the library, the one I volunteer at,  today and wanted to get a book name of White Noise. It had to be ordered and she will get it next week. I've been learning how to use the interweb and tried to put a google on the name of this book to find out more about it for my own knowledge. What I come up with were a lot of mention of little machines what put out a kind of radio sound what are called white sound or white noise. It is supposed to muffle out sounds what you don't want to hear. I ain't learned enough about this kind of invention to figure out all the uses, but it would have been real handy to have around while I were married to my second wife.