At least one embodiment of the present disclosure provides a fingerprint identification structure and a display device. At least one embodiment of the present disclosure provides a fingerprint identification structure, including: an ultrasonic emission component including a plurality of ultrasonic emission units arranged in a two-dimensional array in directions parallel to a plane; and an ultrasonic detection component including a plurality of ultrasonic detection units arranged in a two-dimensional array in the directions parallel to the plane. The ultrasonic emission component and the ultrasonic detection component are two independent structures, and an orthographic projection of at least one ultrasonic detection unit on the plane is included between orthographic projections of two adjacent ones of the plurality of ultrasonic emission units on the plane.

At least one embodiment of the present disclosure provides a fingerprint identification structure and a display device. At least one embodiment of the present disclosure provides a fingerprint identification structure, including: an ultrasonic emission component including a plurality of ultrasonic emission units arranged in a two-dimensional array in directions parallel to a plane; and an ultrasonic detection component including a plurality of ultrasonic detection units arranged in a two-dimensional array in the directions parallel to the plane. The ultrasonic emission component and the ultrasonic detection component are two independent structures, and an orthographic projection of at least one ultrasonic detection unit on the plane is included between orthographic projections of two adjacent ones of the plurality of ultrasonic emission units on the plane.

A voice enabled device includes a transducer to capture multiple inaudible signals received from multiple ultrasonic speakers and audio recording electronics to process the multiple inaudible signals to generate digital output samples, which are recorded sound data comprising non-linearities from frequency-shifted versions of the multiple inaudible signals to within an audible frequency range. A processing device is to detect, within the recorded sound data, at least a portion of the non-linearities, e.g., via: comparison of the recorded sound data with expected patterns from an audible audio signal generated by human voice; and detection of non-linear variations within the recorded sound data as compared to the expected patterns. In response to the detection, the processing device is further to suppress an action programmed for response to a voice command corresponding to the recorded sound data.

A voice enabled device includes a transducer to capture multiple inaudible signals received from multiple ultrasonic speakers and audio recording electronics to process the multiple inaudible signals to generate digital output samples, which are recorded sound data comprising non-linearities from frequency-shifted versions of the multiple inaudible signals to within an audible frequency range. A processing device is to detect, within the recorded sound data, at least a portion of the non-linearities, e.g., via: comparison of the recorded sound data with expected patterns from an audible audio signal generated by human voice; and detection of non-linear variations within the recorded sound data as compared to the expected patterns. In response to the detection, the processing device is further to suppress an action programmed for response to a voice command corresponding to the recorded sound data.

An electroacoustic transducer comprising an electromechanical transducer and a vibratory component. The latter has a generally cylindrical side wall, an outwardly directed portion at the base of the side wall, and a generally planar vibratory top wall extending inwardly from the rim of the side wall further from its base to close the upper end of the cylindrical side wall. The said outwardly directed portion is mounted on the electromechanical transducer.

The invention relates to a signalling device comprising a cover, a light source (22) mounted on a support circuit board (20) and a vibrating generator (25, 26) intended to emit sound waves, the cover forming an outer wall (11) that is at least partly translucent, characterized in that: the light source (22) is positioned between the vibrating generator (25, 26) and the outer wall (11); the cover comprises a connecting column (12) that passes through the support circuit board (20) and to which the vibrating generator (25, 26) is fixed.

The invention relates to a signalling device comprising a cover, a light source (22) mounted on a support circuit board (20) and a vibrating generator (25, 26) intended to emit sound waves, the cover forming an outer wall (11) that is at least partly translucent, characterized in that: the light source (22) is positioned between the vibrating generator (25, 26) and the outer wall (11); the cover comprises a connecting column (12) that passes through the support circuit board (20) and to which the vibrating generator (25, 26) is fixed.

An ultrasonic transducer for an ultrasonic flow meter, with a transducer housing, with a transducer element for generating and/or for receiving ultrasonic signals and with an emitting element, the emitting element being exposed to ultrasonic signals at least indirectly from the transducer element and emitting the ultrasonic signals via one end face on one front side of the emitting element into the vicinity bordering the ultrasonic transducer and/or the emitting element picking up ultrasonic signals from the vicinity via one end face on one front side of the emitting element and transmitting them at least indirectly to the transducer element. A good directional action in spite of small dimensions is achieved by the emitting element being connected to the transducer housing via a connecting element and being free standing on its periphery on the front side such that it can oscillate freely on the periphery.

Transducer assemblies that can be used in acoustophoretic systems are disclosed. The acoustophoretic systems including the transducer assemblies and methods of operating the acoustophoretic systems are also disclosed. The transducer assemblies include a housing, a polymeric film attached to the housing, and a piezoelectric material attached to the polymeric film. The piezoelectric material is not attached to, and does not come in direct contact with, the housing. The piezoelectric material is configured to be driven by a drive signal to create a multi-dimensional acoustic standing wave. The piezoelectric material can be attached to the polymer film by an adhesive coating on the polymer film.

A series of multi-dimensional acoustic standing waves is set up inside a growth volume of a bioreactor. The acoustic standing waves are used to hold a cell culture in place as a nutrient fluid stream flows through the cell culture. The nutrient fluid stream dislodges some cells from the cell culture, which can then be recovered for cell therapy applications. The cell culture continues to expand and reproduce, permitting continuous recovery of cells from the bioreactor.