Version 2.4

• Notably increasing convergence speed of Z-plane design

Version 2.3

• Linear phase FIR-design (equiripple)
• Linear phase FIR-design (maximally flat passband response)

Version 2.0

• Butterworth IIR-design
• Chebyshev Type1 IIR-design
• Chebyshev Type2 IIR-design
• Elliptical IIR-design

Version 1.6.5

• Slight changes in the screen appearance
• Availability of Windows® .exe version

Version 1.6

• Possibility of freezing the group delay constraints to facilitate design of minimum delay filters and fractional delay filters

Version 1.5

• Constraint setting for pole and zero radii to facilitate minimum phase design or IIR-filter design with minimum impulse response length

Version 1.4

• Design of first and second order section with quantized coefficients

Version 1.3

• Design of allpass filters

Version 1.2

• Introducing the application of a fixed prefilter (IIR or FIR)

Version 1.1

• Introducing filter design with quantized coefficients (direct form)

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