Known the ideal and real phase response of analog filter, how to design all-pass filter using the phase difference to obtain linear phase response?

We know the ideal and real phase response, I would like to compensate the phase error using digital all-pass filter. How can I design the all-pass filter?

Thank you.

Answer 1

[Arthi Sathyamurthi]

All Pass filter basically provides fixed phase shifts depending on the frequency of the input signal. The phase shift change depends on the design of the filter, henceforth its coefficient values. Matlab allows you to create an all pass filter object using the all-pass filter function based on the structure and coefficients and further you can use it to filter your input signal