caa a22 4500 465783902 CHVBK 20180323112003.0 cr unu---uuuuu 170327e19900901xx s 000 0 eng 10.1007/BF02441963 doi (NATIONALLICENCE)springer-10.1007/BF02441963 Technique for the evaluation of derivatives from noisy biomechanical displacement data using a model-based bandwidth-selection procedure [Elektronische Daten] [M. D'Amico, G. Ferrigno] Smoothing and differentiation of noisy signals are common problems whenever it is difficult or impossible to obtain derivatives by direct measurement. In biomechanics body displacements are frequently assessed and these measurements are affected by noise. To avoid high-frequency noise magnification, data filtering before differentiation is needed. In the approach reported here an autoregressive model is fitted to the signal. This allows the evaluation of the filter bandwidth and the extrapolation of the data. The extrapolation also reduces edge effects. Low-pass filtering is performed in the frequency domain by a linear phase FIR filter and differentiation is performed in the frequency domain. The reported results illustrate the accuracy of the algorithm and its speed (mainly due to the use of the FFT algorithm). Automatic bandwidth selection also guarantees the homogeneity of the results. IFMBE, 1990 AR modelling nationallicence Derivative assessment nationallicence FIR filtering nationallicence Spectral estimation nationallicence D'Amico M. Centro di Bioingegneria, Fondazione Pro Juventute, Via Gozzadini 7, 20148, Milano, Italy aut Ferrigno G. Centro di Bioingegneria, Fondazione Pro Juventute, Via Gozzadini 7, 20148, Milano, Italy aut Medical and Biological Engineering and Computing Kluwer Academic Publishers 28/5(1990-09-01), 407-415 0140-0118 28:5<407 1990 28 11517 https://doi.org/10.1007/BF02441963 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02441963 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- D'Amico M. Centro di Bioingegneria, Fondazione Pro Juventute, Via Gozzadini 7, 20148, Milano, Italy aut NATIONALLICENCE 700 1- Ferrigno G. Centro di Bioingegneria, Fondazione Pro Juventute, Via Gozzadini 7, 20148, Milano, Italy aut NATIONALLICENCE 773 0- Medical and Biological Engineering and Computing Kluwer Academic Publishers 28/5(1990-09-01), 407-415 0140-0118 28:5<407 1990 28 11517 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer