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Description 

ferNone 

Filter was designed successfully. 

ferNeedTwoBands 

At least two bands are required for a lowpass/highpass/bandstop/bandpass filter. 

ferConsecutiveStopBands 

You can not have two consecutive stop bands, but you can have two consecutive pass bands. 

ferInvalidBand 

Frequency band specification is invalid. 

ferOverlappingBands 

Pass/stop frequency bands are overlapping. You need some empty space between two bands for the transition region. Very narrow transition regions result in filters with long time delays and long computation times. 

ferRangeError 

Frequency band exceeds the frequency range. 

ferGainRipple 

Invalid value of Gain or Ripple. Gain can be 1, >1, or 0. Ripple must smaller then 1 and bigger then zero.