Fecha de publicación: -- Fuente: Wipo "Sensorization" A user classification system is provided. The system includes a user device and a sensor for producing a sensor signal. The sensor produces a sensor signal and comprises a controller. The controller can provide drive signals to be transmitted by the sensor as ultrasonic pulses and receive and process signals recorded by the sensor. The signals recorded by the sensor can include one or more recorded reflections of the ultrasonic pulses transmitted by the sensor. The system classifies a user of the system based on the sensor signal.