Using sound for transferring data is nothing new. In the 1940s, when IBM tried to solve the problem of how to use regular telephone lines to connect two computers, it figured out a way to convert data into sound, send the sound over the phone and then convert it back into data. (Yes, I’m talking about the modem.)

The benefit of using sound for data transmission was that equipment to handle the process was widely available.

In the wireless era, sound is still a great option for data transmission and other uses, and for the same reason.

Lately there’s been a surge of innovations that harness sound waves to transmit data and do other creative things. Here’s what’s going on.

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