A sound wave transducer is provided. The sound wave transducer includes a first board, a spacer layer and a second board over the first board and the spacer layer. The first board includes a carrier, a first substrate layer and a first metal layer. The carrier has a first opening formed in a central region. The first substrate layer is disposed on the carrier and over the first opening. The first metal layer is disposed on the first substrate layer. The spacer layer is disposed on the first board and surrounds the central region. The second board includes a second substrate layer, a second metal layer disposed on the spacer layer, and a plurality of second openings penetrating through the second substrate layer and the second metal layer.

Embodiments of the present disclosure provide a microphone and an intelligent voice device. The microphone includes a housing, a diaphragm, a primary sound pickup component, and a secondary sound pickup component. The diaphragm is configured to output an electric signal according to a sound pressure acting on the first sound pickup surface and the second sound pickup surface. The primary sound pickup component is formed on the housing, and configured to transmit a sound wave from outside of the housing to the first sound pickup surface through a primary sound pickup channel at a first sound pressure. The secondary sound pickup component is formed on the housing, and configured to transmit the sound wave to the second sound pickup surface through a secondary sound pickup channel at a second sound pressure, the secondary sound pickup channel being different from the first sound pressure.

A multi-modal field-programmable metamorphic sensor is provided. The metamorphic sensor has a multi-layer structure, including an upper electrode layer, a spacer layer, and a lower electrode layer. At least one of the upper electrode layer and the lower electrode layer is a sensor A. The spacer layer is disposed between the electrode layers. A sensor B is formed through forming a structure of electrode layer-spacer layer-electrode layer structure. When detecting an object, the measurement of different physical quantities of different objects is implemented through switching between the sensor A and the sensor B. The sensor serves as a single cell. Multiple single cells are combined to form a multi-cell sensor. A signal acquisition system for acquiring signal of the sensor is also provided.

A piezoelectric microelectromechanical systems device is provided, having a first piezoelectric layer, a first metal layer including a first metal, a second metal layer including a second metal, the first and second metals having different properties to compensate deflection due to thermal stress of any or all of the piezoelectric layer, the first metal layer, and second metal layer and a substrate including at least one wall defining a cavity and the at least one wall supporting the layers. The method for making the piezoelectric microelectromechanical systems device is also provided.

A device comprising: a sensor; and a first circuit configured to detect when an input stimulus to the sensor satisfies one or more detection criteria, and further configured to produce a signal upon detection that causes adjustment of performance of the device; and a second circuit for processing input following detection, wherein the second circuit is configured to increase its power level following detection, relative to a power level of the second circuit prior to detection.

A device comprising: a sensor; and a first circuit configured to detect when an input stimulus to the sensor satisfies one or more detection criteria, and further configured to produce a signal upon detection that causes adjustment of performance of the device; and a second circuit for processing input following detection, wherein the second circuit is configured to increase its power level following detection, relative to a power level of the second circuit prior to detection.

An electroacoustic transducer assembly includes an electrostatic diaphragm having a surface. The diaphragm includes a film of flexible insulating material and electrically conductive material within the film to achieve a uniform electrical resistivity over the surface.

An acoustic device is described and includes an acoustic sensor element configured to sense acoustic energy and produce an output signal and a threshold detector circuit including a switch having an input coupled to the output of the acoustic sensor element to receive the output signal, a control port that receives a control signal, and first and second output ports, a first channel including an analog-to-digital converter that operates at a first power level a second analog-to-digital converter that operates at a second higher power level, relative to the first power level and a threshold level detector that receives an output from the first analog-to-digital converter to produce the control signal having a first state that causes the switch feed the output signal from the acoustic sensor element to the second analog-to-digital converter when the first digitized output signal meets a threshold criteria.

An acoustic device is described and includes an acoustic sensor element configured to sense acoustic energy and produce an output signal and a threshold detector circuit including a switch having an input coupled to the output of the acoustic sensor element to receive the output signal, a control port that receives a control signal, and first and second output ports, a first channel including an analog-to-digital converter that operates at a first power level a second analog-to-digital converter that operates at a second higher power level, relative to the first power level and a threshold level detector that receives an output from the first analog-to-digital converter to produce the control signal having a first state that causes the switch feed the output signal from the acoustic sensor element to the second analog-to-digital converter when the first digitized output signal meets a threshold criteria.

A metallic diaphragm disk incorporating a piezoelectric material bonded thereto and operatively coupled to a base rim of a housing provides for closing an open-ended cavity at the first end of the housing. At least one inertial mass is either incorporated in or attached to the housing. A plastic film adhesively bonded to at least one of an outer rim of the housing or an outer-facing surface of the disk provides for receiving an adhesive acoustic interface material to provide for coupling the housing to the skin of a test subject.