The method of DJ's VisuShrink denoising has been applied widely in degital signal processing. But the quality of the signal restored from noise is related to the parameter j₀, the low-resolution cutoff, and that the selecting of j₀ is related to the noise power σof a signal corrupted by an additive noise and the sampling rate of the signal. This article analyzes these relationships among these parameters and gives many simulation results. These results have significant meanings in selecting the parameter j₀.