There are devices called acoustic modems that do this: http://www.aquasent.com/acoustic-modems/ A place I worked at in the early 2000's used these in custom-designed acoustic telemetry systems deployed in the ocean (I…
There are devices called acoustic modems that do this: http://www.aquasent.com/acoustic-modems/ A place I worked at in the early 2000's used these in custom-designed acoustic telemetry systems deployed in the ocean (I…