When we, as a human-being, divide sounds into two big sort, there could be two different kinds of sounds which are audible and inaudible. If you know how dolphins communicate each other under the sea, you will notice some of them we can hear but most of them we cannot hear as a human's perseption since we use different level of audile frequency. What I wanted to express here is text and data throughout dolphin's frequency. Sound we can hear is text as a pure text, and the sound that we cannot hear but be audible by traslating device is data.