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A soft clipper is similar to a hard clipper, but with the
corners smoothed. A common choice of soft-clipper is the cubic
nonlinearity, e.g. [492],
![$\displaystyle f(x) = \left\{\begin{array}{ll} -\frac{2}{3}, & x\leq -1 \\ [5pt] x-\frac{x^3}{3}, & -1 \leq x \leq 1 \\ [5pt] \frac{2}{3}, & x\geq 1. \\ \end{array} \right. \protect$](img1987.png) |
(10.5) |
This particular soft-clipping characteristic is diagrammed in
Fig.9.3. An analysis of its spectral characteristics, with some
discussion of aliasing it may cause, was given in in §6.13.
An input gain may be used to set the desired degree of distortion.
Figure 9.3:
Soft-clipper defined by Eq.(9.5).
![\includegraphics[width=3in]{eps/cnl}](img1988.png) |
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