This invention relates to a microelectromechanical loudspeaker implemented as a system-on-chip or system-in-package. The microelectromechanical loudspeaker includes a microelectromechanical sound-generating device implemented in a microelectromechanical system (MEMS) and a microphone mounted on the cover or integrated in the cover, wherein the microphone is positioned adjacent to one of the sound outlet openings of the cover. The MEMS comprises a cavity formed between a planar cover, a planar base and circumferential sidewalls provided between the cover and the base. The MEMS further comprises a plurality of movable actuators for generating sound. The actuators are provided in the cavity between the cover and the base, and wherein the cover and the base have a plurality of sound outlet openings to emit sound in a direction transverse to the cover and the base, respectively.

A circuit includes a first biasing voltage source, a second biasing voltage source, a first resistor device coupled between the first biasing voltage source and a first terminal of the circuit, a second resistor device coupled between the second biasing voltage source and a second terminal of the circuit, a third resistor device coupled between the second biasing voltage source and a third terminal, a first capacitor coupled between the third terminal and ground, and an amplifier having an input coupled to the second terminal and an output coupled to a circuit output.

The present disclosure relates to a transducer assembly including a transducer having a movable member, and a servo-loop controller configured to compensate for effects of a disturbance on the transducer assembly by adjusting a bias voltage applied to the transducer. A servo-loop controller having a smaller bandwidth for out-of-band disturbances than for in-band disturbances and configured to control the bias voltage based on a feedback signal generated by a sensor that detects an effect of the disturbance on the transducer assembly. The transducer assembly can be implemented as a microphone or a speaker among other sensors and actuators.

Various arrangements for providing audio calibration are presented. A remote control may determine that it is in position for an audio-based command to be received by the remote control from a user. Via a condenser microphone incorporated as part of the remote control, a calibration sound may be output. The condenser microphone may receive the output the calibration sound in the form of a reflected sound that is an acoustic reflection of the calibration sound. The remote control may analyze an amount of time that has elapsed between outputting the calibration sound and receiving the reflected sound to determine a distance between the condenser microphone and the user. One or more audio input settings may be configured that are used for modifying audio received by the condenser microphone based on the determined distance.

Various arrangements for providing audio calibration are presented. A remote control may determine that it is in position for an audio-based command to be received by the remote control from a user. Via a condenser microphone incorporated as part of the remote control, a calibration sound may be output. The condenser microphone may receive the output the calibration sound in the form of a reflected sound that is an acoustic reflection of the calibration sound. The remote control may analyze an amount of time that has elapsed between outputting the calibration sound and receiving the reflected sound to determine a distance between the condenser microphone and the user. One or more audio input settings may be configured that are used for modifying audio received by the condenser microphone based on the determined distance.

A computer-implemented method, system and computer program product for detecting or predicting system faults in cooling systems. A model (deep learning model) is built and trained to detect or predict system faults in a cooling system based on acoustic emission signals (both in temporal and frequency domains) and/or imaging signals. Upon training the model to detect or predict system faults in a cooling system, acoustic emission signals may be obtained non-intrusively from the cooling system using acoustic emission sensors, hydrophones and/or microphones. Additionally, upon training the model to detect or predict system faults in a cooling system, imaging signals (e.g., boiling images) may be obtained non-intrusively from the cooling system using optical sensors (e.g., high-speed camera). The trained model may then detect or predict a system fault in the cooling system based on such information (acoustic emission signals, including in temporal and frequency domains, and/or the imaging signals).

A sensor amplifier arrangement includes an amplifier having a signal input to receive a sensor signal and a signal output, and a feedback path that couples the signal output to the signal input, wherein the feedback path includes an anti-parallel circuit of diodes, and a voltage divider including a first and a second divider resistor and a voltage divider tap between the first and the second divider resistor, wherein the voltage divider couples the signal output to a reference potential terminal, and the voltage divider tap is coupled to the anti-parallel circuit of diodes and the anti-parallel circuit of diodes is coupled to the signal input.

Measures for regulating the electrical bias voltage at the measuring capacitor of a MEMS sensor element are described. A base voltage is applied to the measuring capacitor and regulated in such a way that the potential difference between the two electrode sides of the measuring capacitor corresponds to the setpoint voltage. The base voltage is regulated in a low-voltage range.

Measures for regulating the electrical bias voltage at the measuring capacitor of a MEMS sensor element are described. A base voltage is applied to the measuring capacitor and regulated in such a way that the potential difference between the two electrode sides of the measuring capacitor corresponds to the setpoint voltage. The base voltage is regulated in a low-voltage range.

An improved compact electroacoustic transducer and loudspeaker system. The electroacoustic transducer (or array of electroacoustic transducers) can generate the desired sound by the use of pressurized airflow. The electroacoustic transducer uses a shared stator with an array of vent support fingers and metal frame instead of two stators per electroacoustic transducer.