#### Cubic Soft-Clipper Spectrum

The cubic soft-clipper, like any polynomial nonlinearity, is defined directly by its series expansion:

 (7.19)

In the absence of hard-clipping ( ), bandwidth expansion is limited to a factor of three. This is the slowest aliasing rate obtainable for an odd nonlinearity. Note that smoothing the corner'' in the clipping nonlinearity can reduce the severe bandwidth expansion associated with hard-clipping.

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