Adding Static Signal Mappings

A static signal mapping is a point-wise transformation of one signal into another. This is a mapping in which every signal sample is transformed independently of other samples. Oposite kind of signal transformations are dynamic transforms, including filtering (see Adding Filtered Signals), where each sample is mapped taking in consideration values of its neighbouring samples.

Some well-known and widely used examples of static or point-wise mappings are:

  • scaling : multiplication of signals with a constant

  • value shift or offset : adding a constant to a signal

  • various nonlinear transforms, including finding square roots or powers of signal values.

Note also that any combination of pint-wise mapping is itslef a pointwise transform.

To create a static signal map in Perun PowerDesk, simply choose Add Static Signal Mapping … option from the Main Window Ribbon Menu. The following dialog appears

_images/dst_staticmap.png

The Define Static Signal Map dialog.

The dialog allows for defining the source signal, i.e. the signal to be mapped, the name of the transformed signal, and the expression used to transform the source signal. The expression uses symbol x to denote the value of the source sample. Otherwise, the syntax is common and straightforward to use. For more details see Expression Syntax.