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I want to delay the part of signal above (or below) specified frequency, but I don't find any books or tutorials to tell how to design is. The commonly used biquad APFs (such as the one introduced in this cookbook) produce a zigzag-shaped phase response, that is not I want.

How can I do it? Thanks for a lot!

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    $\begingroup$ "zigzag-shaped phase response, that is not I want" Are you sure? Are you aware that the group delay curve is the derivative of the phase curve? So even a constant delay at all frequencies produces a zig-zag phase curve when the phase wraps around? $\endgroup$ – endolith May 22 '17 at 13:55

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