Ultrasonic sensor having activatable notch filter

Abstract

The invention relates to an ultrasonic sensor (14) for emitting ultrasonic signals and for receiving ultrasonic echoes, in particular for use on a vehicle (10), having an ultrasound diaphragm, a piezoelectric element (26) mounted on the ultrasound diaphragm, an amplifier circuit (36), and connection circuitry (28), which electrically connects the piezoelectric element (26) and the amplifier circuit (36), wherein the connection circuitry (28) comprises an activatable notch filter (38) having a filter frequency (fF), and the ultrasonic sensor (14) is designed to activate the notch filter (38) in the event of interference in the region of the filter frequency (fF) during reception of the ultrasonic echoes. The invention also relates to an ultrasonic detection system (50) having a plurality of ultrasonic sensors (14) for detecting an environment (24), in particular an environment (24) of a vehicle (10), on the basis of sensor information provided by the ultrasonic sensors (14), having a plurality of ultrasonic sensors (14) that are connected to each other via a data link (18), wherein one of the ultrasonic sensors (14) is in the form of a master (M) in order to receive the sensor information from at least one further ultrasonic sensor (14), which is in the form of a slave(S), and to process this sensor information in order to detect the environment (24) of the vehicle (10), wherein the ultrasonic sensors (14) are embodied as specified above. In addition, the invention relates to a driving assistance system (12) having at least one ultrasonic sensor (14) for providing sensor information, and having a control unit (16), wherein the at least one ultrasonic sensor (14) and the control unit (16) are connected to each other via a data link (18), and the control unit (16) is designed to receive the sensor information from the at least one ultrasonic sensor (14) and to process this sensor information in order to detect the environment (24) of the vehicle (10), wherein the at least one ultrasonic sensor (14) is embodied as specified above.

Dependencies are inferred from the claim text.