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Figure 2: The true curve is a third-order polynom. The two simulated observed curves are based on 5-dB standard deviation of the noise indicator. Both methods 1 and 2 result in observed curves which overestimate the effect. At high noise levels, method 2 turns into an asymptotic shape not exceeding 100%

Figure 2: The true curve is a third-order polynom. The two simulated observed curves are based on 5-dB standard deviation of the noise indicator. Both methods 1 and 2 result in observed curves which overestimate the effect. At high noise levels, method 2 turns into an asymptotic shape not exceeding 100%