Any advice about externel speech recognition chip

Any suggestions about externel speech recognition chip for TX2?

Hi, do you mean the low power speech recognition chip? Seems no such topic before, but if the interface of it is standard, that will be ok for TX2 from hardware point of view.

This may be more complicated than what you want, but there is an upcoming webinar on something very similar to what you are thinking about. Toradex makes some low power embedded systems which might be adapted for what you want. They have an upcoming webinar which might at least give you some ideas:
https://www.toradex.com/webinars/how-to-design-and-build-alexa-into-the-colibri-imx7-and-chatterbox-avs-development-board

The IMX7 might do what you want.