Representation of the BMC coding of a generic data signal. I made this picture by myself using dia (see http://www.gnome.org/projects/dia/) on Linux. A PNG version is available on Image:Bmc.png.

I don't know why it looks so bad: the PNG version is alright and, if I see the svg on any programme, it looks alright, too. Maybe it is a bug in the wikimedia engine?!
No machine-readable source provided. Own work assumed (based on copyright claims).
No machine-readable author provided. Alejo2083 assumed (based on copyright claims).