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I have no idea whether or not this would be practicable, but would it be possible to include a Bessel type high-pass filter in Elephant?  From what I have read this type of filter gives less group delay (phase distortion) in the pass band than Butterworth etc..  Just a thought.

Thanks for the tip, yes I have plans on including several filter types.  Actually, I'm designing Elephant v2 now.  Also, there are plans on implementing a new limiting mode.  Oversampling (2x, 3x, 4x) will be made selectable meaning only a single DLL will be necessary.

I'm looking forward to it.

Hey this sounds good to me - great ideas Andrew & Aleksey - if it's not an April fools joke, hehe :)

That's not a joke for sure :) Tough competition time. :) (which IS a neverending joke ;)

hi folks.

The bessel highpass filter seems to take out Waaaay more bottom end than the other one. -

Is this because It's more effective, or is there some other reason?


Kind regards

Dave Rich.

Hi Dave, I think that that is just the nature of Bessel filters -- although their passband is linear phase (unlike Butterworths), they start rolling off at a higher frequency above the cut-off frequency.  This means that you probably need to set a lower cut-off with the Bessels than with Butterworths so as not to affect your audible lows too much.  If you do this, the Bessels will provide less ultra-low cut than Butterworths, but in return they will have a better phase response in the audible band.  AFAIK it's an unavoidable trade-off.

The reason Bessel filter 'eats' more frequency content is because its roll-off is pretty wide in comparison to Butterworth filter.