Fig. 3.

A diagram illustrating the decompose-synthesize-decompose-compare (DSDC) method used to assess the accuracy of the decomposition algorithm. A recorded sEMG signal s(n) is decomposed to identify its MUAP trains (MUAPTs). A reconstructed signal y(n) is synthesized by summing together the real MUAPTs from s(n) and time-varying Gaussian noise for which the variance is set equal to that of the residual signal from the decomposition. The reconstituted signal y(n) is then decomposed and compared with the MUAPTs within the synthesized signal. The Xs indicate discrepancies between the MUAPTs of y(n) and s(n), which are designated as errors based on a comparison of the MU firing times and MUAP shapes.