Is AEC ReSpeaker tech + XMOS tech or XMOS tech only?

Hello,

I tested ReSpeaker Mic Array v2.0 and was surprised to hear the clean voice output and complete removal of playback sound.

I know that there is XMOS’s tech that work for AEC but the result that I saw was too perfect.

I guess that ReSpeaker’s voice processing firmware is loaded on the XMOS chip (XVF3000).

Is AEC performance result of ReSpeaker tech + XMOS tech (as I guess) or XMOS tech only?

Thanks.