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How to build a 75us pre-emphasis filter in ADAU1701

Question asked by Xuzhengyu on May 21, 2017
Latest reply on May 26, 2017 by TylerK

FM systems use a pre-emphasis for the audio signals. That means, all audio  frequencies above a corner frequency are emphasized.

The corner frequencies are:    fc = 2.1221 kHz

This gives the time constants:     τ = 75 μsec

I designed it according to the instructions of others, but the results did not correspond to the requirements.

What is the problem? Thank you .