Hi Yin,
You can take a look to Essential Audio Processing Library | NXP that includes a range of sound processing algorithms that can be tuned to your application. The EAP library is complimentary to use with supported NXP devices, and is available in the MCUXpresso SDK in the form of precompiled libraries.
I recommend you to check the documentation available in the following SDK path.
C:\NXP\SDK_2.8.0_EVK-MIMXRT685\middleware\EAP
I hope this helps.
Best regards,
Felipe