Google books could be your friend here. Sounds to me like you might benefit from a physics 101 type text, such as Halliday and Resnick. All these types of boo

Google books could be your friend here. Sounds to me like you might benefit from a physics 101 type text, such as Halliday and Resnick. All these types of books will have a section on waves and their applications in the real world. Some, on fourier series too. Some of these books will have a preview mode on google books (though not Halliday & Resnick). Try to find the ones that do.