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How to reduce noise while using SLAC on CC8520?

Hi,

I found audio noise is increasing on high frequency when I'm using SLAC on CC85xxDK. Please refer to attached pictures (FFT_1kHz_step.zip) which were captured FFT by increasing frequency with 1kHz step on AP.

1781.FFT_1kHz_step.zip

1. Please let me know how to reduce audio noise on high frequency inputhttp://e2e.ti.com/cfs-file.ashx/__key/communityserver-discussions-components-files. (Please refer to the attached project / cc85xxdk_SLAC.zip)</p> <p>[View:http://e2e.ti.com/cfs-file.ashx/__key/communityserver-discussions-components-files/382/2045.cc85xxdk_5F00_SLAC.zip

2. There are unexpected components on other frequency than input frequency when I test SLAC with 48kHz. Unexpected frequency components are exist higher than 8kHz. Should I use only 44.1kHz for SLAC? (Please refer to the attached picture measured with 9kHz input / 9kHz_48khz_Sine_AP-CC8520_FFT.jpg)

Thanks,

Shaka