Bluetooth Module, Timing Devices, Radio frequency demodulator

A demodulator is a circuit that is used in amplitude modulation and frequency modulation receivers in order to separate the information that was modulated onto the carrier from the carrier itself. 

https://www.futureelectronics.com/p/wireless-rf--rf-modules-solutions--80211-wlan/rs9113-n00-d1w-redpine-5050710