Higo Silva has just finished his internship within RFWild. He developed an embedded system to capture and process audio signals, aiming to detect whether a baby is crying. If so, the system activates an RF transceiver which transmits a code for a (wireless) wristband which incorporates a vibracall, which will vibrate to alert (deaf) parents. A patent was deposited for the system in 2015.
Check the Youtube video of RFWild´s prototype demonstration: