Fig. 10
From: An improved wavelet threshold denoising approach for surface electromyography signal
Individual example of the extraction of muscle synergies. a Original signal amplitude-frequency graph, b signal amplitude-frequency graph after adding noise, c signal amplitude-frequency graph after soft function filtering based on rigrsure threshold, d signal amplitude-frequency graph after soft function filtering based on rigrsure threshold, and e signal amplitude-frequency graph after improved threshold function filtering