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Old 20th February 2017, 12:34 PM   #1
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Join Date: Apr 2003
Location: Brno
Default Phase inversion using biquad filter?


is it possible to invert phase using IIR/biquad filter?

I'm designing a digital crossover and I would like to have a possibility to invert the drivers in digital domain (rather than changing the wiring).
I have found formulas for different filter types (HP, LP, Peak, All pass, ...) - 2nd order biquad (a and b coefficients): but I'm not sure if it is possible to invert the phase too.

Any thoughts?
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Old 24th February 2017, 04:12 PM   #2
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Join Date: Apr 2012
If you are programming it, and not forced to use IIR/Biquad, inversion of polarity is a simple multiply by -1 operation for each sample.
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Old 6th March 2017, 07:08 AM   #3
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Location: Grantham, NH
you can do it in hardware with an XOR chip on the data line too. very old school
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