Being googling and check out TI website. Not much echo cancellation application note. I am working with Omap3530 and tps65950. Do you have any recommendation how to do this echo cancellation both on hardware and software (linux)?
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Have you looked at the acoustic echo cancellation library there:
http://www.ti.com/tool/telecomlib
Echo cancellation is also likely to be part of pro-audio development kit (PADK), but that software might not be compatible with OMAP3.
You might also want to check out echo cancellation solutions from TI partners like Adaptive digital
http://www.ti.com/devnet/docs/catalog/embeddedsoftwarefulldetails.tsp?productId=4660
Hope this helps
Regards,
Rahul