I'm looking to transfer very simple information using audio waves. One of the approaches I'm looking into is using different frequencies. For example, "command 1" will be transmitted using 500Hz wave, where "command 2" using 700Hz wave. On the other side, the decoder will look if we have a wave with that frequency and then interpret the command.
The challenge appears when I'd like to transmit 2 (or more) commands simultaneously - I get a new wave form. If I remember right from my physics studies - it's a "Wave package", so I get new frequencies, additional to the original ones.
My question is - Is there a way to receive this "wave package" and interpret the original commands from it?