How to test ADAU1467 noise reduction block?

Hi Sir

I have a ADAU1467 EVB and try to verify the noise reduction performance. I download your trial Noise reduction block. My schematic is at below picture.

Main schematic

In the Block

I record the noise on my car and put it in one input port. The other is outside vocal. Look like this block can work but there is gi-gi noise on the output. I put a voice file in the attachment. I have some question.

0246.NR noise + vocal.wma

1. Is my schematic correct? Should I need to add a filter to remove the gi-gi noise?

2. What this noise reduction block can do? I can't find the information of this block in the Wiki. What noise this block can reduction?

3. What noise signal I should put on the input port to test this block? It is hard to verify the performance of noise reduction. I only can verify it by my ears.

Audio Signal Processors

adau1467

SigmaDSP Audio Processors