Subject: Re: [linux-audio-dev] IIR dc-buildup
From: Niels A. Moseley (n.a.moseley_AT_student.utwente.nl)
Date: Tue Aug 14 2001 - 22:46:10 EEST
Hi!
Sorry for butting in...
>I've got lot of stability problems with high order IIR lowpass filters.
>Those tend accumulate significant DC offsets over time. OK for short samples
>but not for realtime streaming, IMHO.
>
>Of course I could add DC notch after LP but that would mess the phase
>response and getting the response steep enough would be hard.
Does this DC buildup occur in direct-form IIR filters or do you use a
serial biquad structure?
Cheers, Niels.
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