- Two constant modes (below 0 and above 1)
- Two linear modes (between 0 and ULow, between UHigh and 1)
- One non-linear mode (between ULow and UHigh)
The function is continuous thanks to the adjusted coefficients A1 and A2.
If A1 * A2 = 1, the characteristic is a symmetry : for any value of u between 0 and 1, y(y(u)) = u.