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Old 16th September 2003, 08:01 PM   #1
Zodiac is offline Zodiac  United States
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Join Date: Jun 2003
Location: Kenfield, CA, USA
Default Allpass filter design using passive components

Does any1 have any experience of using allpass filters in audio?

An allpass filter does not effect the amplitude of any signal, but it does effect the phase. Hence it can be used to correct the phase shift caused by use of Butterworth-type filters. Does any1 know how to do this?

Also, has any1 compared (listened) to the difference between a lowish order Butterworth and a highish order Bessel? I recall that Thorsten and Elso Kwak have a different approach to this in their treatment of filtering in non os dacs, but what is the difference in sound between a perfect square wave response, higher order Bessel and a phase shift (distorted) low order Butterworth.

Maybe I should just build them both and tell you!!
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Old 20th September 2003, 02:21 PM   #2
bknauss is offline bknauss  United States
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Location: Gaithersburg, MD
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Zodiac, I know you are looking for a passive filter, but I know of an active design using only op amps and resistors. Give me an email if interested.
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Old 20th September 2003, 05:13 PM   #3
advance is offline advance  Switzerland
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Location: Schwyz
This link might help....

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