About how to use SIGMA300 NOISE REDUCTION (NR) PLUG-IN in ADAU1466

Hi ADI Teams
Recently, I worked on a projuct requiring environmental noise reduction, so I tried using the NR modlule with ADAU1466 evk and downloaded its example code.However, I encountered some issues during testing and am unsure if it's due to incorrect usage.

Here is some detailes:
> I replaced the mic input source with white noise to simulate a noisy environment.

> After enabling the input and applying NR processing, I observed a very sharp, piercing sound.
> The output signal level remains at 0dB in Level3 block shows, even when reducing the gain of the white noise input, or disable NR nodule.
> I checke the *sigma300_nr_plug-in_for_sigmastudio_user_guide.pdf* and confirmed the QMF coefficients are correct.

Could this issue be caused by incorrect usage? If so, could you please advise on potential mistakes or troubleshooting steps?

Thanks.

Audio Signal Processors

NR

hardware

SigmaDSP Audio Processors

adau1466