An electronic device is provided. The electronic device includes a device body, a first sound-emitting component, and a second sound-emitting component. the first sound-emitting component and the second sound-emitting component are both disposed in the device body. The first sound-emitting component emits a first ultrasonic wave The second sound-emitting component emits a second ultrasonic wave. A frequency of the first ultrasonic wave is different from that of the second ultrasonic wave. A first sound guide channel and a second sound guide channel are disposed in the device body. A first sound guide hole and a second sound guide hole are disposed at an outer surface of the device body. The first sound-emitting component is connected to the first sound guide hole through the first sound guide channel. The second sound-emitting component is connected to the second sound guide hole through the second sound guide channel.

An electronic module is provided. The electronic module includes a first transducer and a second transducer. The first transducer is configured to radiate a first ultrasonic wave. The second transducer is configured to radiate a second ultrasonic wave. The first transducer and the second transducer are disposed on noncoplanar surfaces.

Embodiments include a vehicle comprising an audio system configured to create a plurality of audio zones within a vehicle cabin, and at least one display communicatively coupled to the audio system. The display is configured to display a separate user interface for each audio zone. Each user interface comprises an engine sound control and a cabin noise control for adjusting an audio output provided to the corresponding audio zone. Embodiments also include a method of providing user-controlled sound isolation in a plurality of audio zones within a vehicle. The method comprises presenting, for each audio zone, a user interface including an engine sound control and a cabin noise control, and generating an audio output for each audio zone based on a first value received from the engine sound control and a second value received from the cabin noise control of the corresponding user interface.

Ultrasonic transducers that are capable of generating increased levels of ultrasound, as well as receiving ultrasonic waves with increased sensitivity. The ultrasonic transducers include a back cover, a protective front cover, a backplate, and a vibrator film layer disposed between the backplate and the protective front cover. The backplate includes a plurality of grooves formed on a surface thereof facing the vibrator film layer. Each groove includes upper edges having cross-sectional contours that gradually tend toward the deepest part of the groove to allow a larger area of the backplate to be closer to the vibrator film layer, thereby increasing the resulting electric field, and, consequently, increasing the output power and sensitivity of the ultrasonic transducer.

An ultrasonic speaker comprises a case that has an opened top surface and includes a plurality of protrusions protruding inward on an inner side surface of the case, a piezoelectric element fixed to a bottom surface in the case, and a substrate that is inserted in the case and placed on upper surfaces of the plurality of protrusions.

A system providing various improved perceptions techniques for haptic feedback above interactive surfaces that require no contact with either tools, attachments or the surface itself is described. A range of receptors in a perceiving member which is part of the human body is identified to create substantially uniformly perceivable feedback. A vibration frequency that is in the range of the receptors in the perceiving member is chosen and dynamically altered to create substantially uniformly perceivable feedback throughout the receiving member.

Estimating the field strength from an ultrasonic phased array can be done by summing the contribution of each transducer to the point of interest. Since this contribution is already calculated when creating a converging spherical wave, it can be reused to add a virtual microphone to the system. By monitoring this microphone and moving it along with new focus points, a robust system of field estimates and regulation may be established.

Methods, systems, and apparatus, including computer programs encoded on computer-storage media, for self-calibrating ultrasonic removal of sea lice. In some implementations, a method includes generating, by transducers distributed in a sea lice treatment station, a first set of ultrasonic signals, detecting a second set of ultrasonic signals in response to propagation of the first set of ultrasonic signals through water, determining propagation parameters of the sea lice treatment station based on the second set of ultrasonic signals that were detected, obtaining an image of a sea louse on a fish in the sea lice treatment station, determining, from the image, a location of the sea louse in the sea lice treatment station, and generating a third set of ultrasonic signals that focuses energy at the sea louse.

A sound field generation apparatus includes: a first modulation unit 10 that modulates an ultrasonic wave signal according to a prescribed modulation system; a second modulation unit 30 that modulates the ultrasonic wave signal ω.sub.0 according to a modulation system different from the modulation system of the first modulation unit 10; a filter unit 20 that changes frequency characteristics of an audible range signal s(t) used in modulation of the second modulation unit 30; a first ultrasonic wave output unit 40 that outputs a first ultrasonic wave signal y-(t) modulated by the first modulation unit 10; and a second ultrasonic wave output unit 50 that outputs a second ultrasonic wave signal y˜(t) modulated by the second modulation unit 30, wherein the filter unit 20 is set to have filter characteristics to cancel a first audible sound y-(t) reproduced by the first ultrasonic wave signal y-(t) with a second audible sound y˜(t) reproduced by the second ultrasonic wave signal y˜(t) at a control point 70 provided outside the sound field 60.

A speaker unit that has a housing, a lower substrate that is fixed to the housing, a plurality of first ultrasonic vibrators that are arranged on the lower substrate, an upper substrate that is fixed to the housing and has a plurality of openings (OP) formed therein at locations that correspond to the first ultrasonic vibrators, and a plurality of second ultrasonic vibrators that are arranged on the upper substrate.