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Figure 6. Comparison of commonly used feature sets. Results represent (a) average over 11 classes of motion collected from 10 nondisabled subjects and (b) average over 7 classes of motion collected from 5 subjects with transradial amputation. AR = autoregressive, MFCC = melscale frequency cepstral coefficients, TD = time-domain, TDAR = time-domain/autoregressive. Scheme E, Englehart K. Electromyogram pattern recognition for control of powered upper-limb prostheses: State of the art and challenges for clinical use. J Rehabil Res Dev. 2011;48(6):643-60.DOI:10.1682/JRRD.2010.09.0177