  A code is presented for fast, easy and efficient communication over channels
that allow only two signal types: a single sound (e.g. a knock), or no sound
(i.e. silence). This is a true binary code while Morse code is a ternary code
and does not work in such situations. Thus the presented code is more universal
than Morse and can be used in much more situations. Additionally it is very
tolerant to variations in signal strength or duration. The paper contains
various ways in which the code can be derived, that all lead to the same code.
It also contains a comparison to other, similar codes, including the Morse
code, in regards to efficiency and other attributes. The replacement of Morse
code with Tap code is not proposed.
