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ALL PASS FILTER & group delay

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pigkiller

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since we can use all pass filter to compensate the group delay of the cascade stage of the low pass filter. I wonder if i can use higher order all pass filters to get better group delay? If we can, what's the defect of using higher order all pass filters?
 

flatulent

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You can make two types of pole-zero combinations. One is on the real axis and the other is complex pairs. You can use any number of these to get a flat group delay.
 

Borber

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Requesting smaller GD ripple has consequence of greater order of allpass filter. Higher order allpass means allso greater total delay of filter.
Complex allpass sometimes means more dificult tunning of a filter.
 

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