Laplace

• Laplace-domain calculation: By providing a negative freq-value, the calculation is carried out in the real Laplace domain s = freq instead of the complex frequency domain s = 2i*pi*freq.

• Improvements to filter design and handling:

  • DigitalFilter now takes an argument (list of strings) for additional coefficients to the default j0, j1, sin, and cos.
  • fdesign can now be used with any name as attribute you want to describe the transform pair (until now it had to be either j0, j1, j2, sin, or cos).
  • The provided sine and cosine transform pairs in fdesign can now be asked to return the inverse pair (time to frequency).

• Other tiny improvements and bug fixes.