According to Apple’s patent application, these kind of sound waves could end up as audible or outside the normal hearing range of 20Hz to 20KHz, where it will “cause an effect in the user interface” of a receiving device. What kind of practical uses could we be looking at assuming that this patent is approved and implemented in a broad sense? Well, it could very well come in handy during a podcast, as users are given links to articles which are relevant to a discussion using nothing but sound waves alone. Apart from that, the patent application also described on how such data could eventually be encoded into an audio stream, where a receiving device would read it, leaving some room for additional “links” to be introduced – whether you like it or not.