Harmonics question

[Prof. Antonio Guerrieri]

	Hi Chris,

>I understand that a square wave is made up of sine waves,

I'm sorry if the following is so technical, anyway I think that is better
to say that a square wave function can be, under the Fourier transform
theorem, described by an infinite sum of sine wave..
Using other transform techniques, a square wave can be described differently.

 >but what are the exact frequencies that the harmonics oscillate at?  For
example, if you
>have a square wave at 130Hz are all the harmonics octaves up and down from it?
>
up, obviously: 130 Hz is the fundamental, all the harmonics (odd multiple
of the fundamental) are located at higher frequencies. This agree with the
sound richness of the square wave.

Ciao,

Antonio