Figure 1. Schematic diagram of the ‘blind signal separation’ algorithm.

The figure shows the problem and process of the ‘blind signal separation’ algorithm used. On the left of the figure are shown the original signals which are mixed by some mixing filter (h), in this case electrical cross-talk between muscles, to produce the observed signals, in this case the EMG recordings. The algorithm used calculates an unmixing filter (w) that when applied to the observed data produces the recovered original signals, in this case the EMG activity minus the electrical cross-talk.