Figure 1.

Example showing the denoising procedure. (a1–a6) Original decomposition level components and prior to noise thresholding; (b1–b6) levels after the noise thresholding procedure; (c1–c6) levels after signal location windowing based on (b6); (d1–d6) same decomposition levels obtained from the reference signal. As noted, (b6) is used to locate the windows. After windowing (c3,c4) are rendered in good agreement with reference (d3,d4), while even (c5) is slightly improved. Note that the windowing is not applied to (c1,c2) because they are all noise as can be seen from (d1,d2).