Embodiments include a primary short circuit coupled to a primary side of a transformer and a dampening element, coupled to a transducer coupled to a secondary side of the transformer, configured to dampen a received signal during a portion of a reverberation period.

Disclosed is a vibration provision system for providing real-time vibration according to a frequency change, including a communication unit 110 configured to receive a signal which is output from a computer, a game machine, or a portable terminal via wired or wireless communication; a conversion unit 120 configured to convert a sound signal transmitted from the communication unit 110 to a vibration signal which is capable of driving a vibrator on a real time basis by amplifying the transmitted sound signal; and a vibrator 130 configured to vibrate according to a vibration signal transmitted from the conversion unit 120, and the present invention provides a haptic signal which is suitable for an image and sound output from a portable terminal realistically and rapidly and thus has an effect to transmit information more realistically by visual, auditory, and tactile sense to a hardware environment requiring three-dimensional vibration.

Disclosed herein are ultrasonic transducer systems comprising: an ultrasonic transducer comprising a substrate, a diaphragm, and a piezoelectric element; a first electrical circuitry coupled to the ultrasonic transducer, the first electrical circuitry configured for driving the ultrasonic transducer or detecting motion of the diaphragm; a plurality of electrical ports coupled to the ultrasonic transducer; and a second electrical circuitry connected to two or more of the plurality of electrical ports, the electrical circuitry comprising one or more of: a resistor, a capacitor, a switch, and an amplifier, wherein the second electrical circuitry is independent from the first electrical circuitry, and wherein the second electrical circuitry is configured to dampen the motion of the diaphragm.

A vibration apparatus and a local vibration adjustment method therefor, and an electronic device are provided. The vibration apparatus includes: two or more excitation modules, a vibration sensing module and a processing module. The vibration sensing module may obtain a vibration sensing signal in a non-target vibration region while target haptic sensation is generated in a target vibration region. The processing module drives, based on the vibration sensing signal, an excitation module in the non-target vibration region to generate corresponding damping vibration to counteract the non-target vibration, thereby weakening the vibration in the non-target vibration region.

An ultrasonic transducer may comprise a transducer body including a first face and a second face disposed on opposite sides of the transducer body, wherein the transducer body comprises a piezoelectric material; a first transducer edge disposed on the transducer body; and a second transducer edge disposed on the transducer body, wherein the first edge is disposed on the transducer body substantially opposite from the second edge, and wherein the first and second transducer edges intersect a perimeter of the transducer body, and wherein the first and second edge forms an angle no less than 3 degrees.

The invention relates to an ultrasonic measuring system (10), in particular for measuring distance and/or as a parking aid in vehicles, having an electroacoustic ultrasonic transducer (12) which has a oscillating element (14), does not have a voltage converter, can be alternately operated as an ultrasonic transmitter and an ultrasonic receiver and has a signal connection (16), which is used either as an input or as an output of the ultrasonic transducer (12), and an earth connection (18) which is connected to earth, and a control and evaluation unit (20) for exciting the oscillating element (14) of the ultrasonic transducer (12) to emit ultrasonic waves for operating the ultrasonic transducer (12) during a transmission interval for the purpose of subsequently deactivating the excitation of the oscillating element (14) and attenuating the latter during a decay phase and for receiving and processing ultrasonic waves in a reception interval. The control and evaluation unit (20) has a bridge circuit (28) which is connected to a DC supply voltage (80) and has controllable switches (30 to 40) and a charge storage capacitance (42), the polarity of which can be reversed and which is intended to alternately output a positive and a negative excitation voltage for the signal connection (16) of the ultrasonic transducer (12) during the transmission interval. The control and evaluation unit (20) outputs a voltage pulse of substantially 0 V at the end of the transmission interval for the signal connection (16) of the ultrasonic transducer (12).

Disclosed is a vibration provision system for providing real-time vibration according to a frequency change, including a. communication unit 110 configured to receive a signal which is output from a computer, a game machine, or a portable terminal via wired or wireless communication; a conversion unit 120 configured to convert a sound signal transmitted from the communication unit 110 to a vibration signal which is capable of driving a vibrator on a real time basis by amplifying the transmitted sound signal; and a vibrator 130 configured to vibrate according to a vibration signal transmitted from the conversion unit 120, and the present invention provides a haptic signal which is suitable for an image and sound output from a portable terminal realistically and rapidly and thus has an effect to transmit information more realistically by visual, auditory, and tactile sense to a hardware environment requiring three-dimensional vibration.

A vibration control device of a plate-like member 11 includes: a plurality of piezoelectric element actuators 14; at least one piezoelectric element sensor 15; and a control circuit 17 that performs feedback control of operation of the piezoelectric element actuators 14 based on an output voltage of the piezoelectric element sensor 15 so as to suppress vibration of the plate-like member 11. A layout of the piezoelectric element sensor 15 and the piezoelectric element actuators 14 is set such that anti-resonance occurs in an output voltage of the piezoelectric element sensor 15 in a range where the vibration frequency of the plate-like member 11 is equal to or less than a predetermined value. Therefore, generation of noise can be prevented at the frequency. As a result, a gain can be increased at a control target frequency. Therefore, vibration can be suppressed, and noise can be reduced.

An ultrasonic transducer may comprise a transducer body including a first face and a second face disposed on opposite sides of the transducer body, wherein the transducer body comprises a piezoelectric material; a first transducer edge disposed on the transducer body; and a second transducer edge disposed on the transducer body, wherein the first edge is disposed on the transducer body substantially opposite from the second edge, and wherein the first and second transducer edges intersect a perimeter of the transducer body, and wherein the first and second edge forms an angle no less than 3 degrees.

An ultrasonic apparatus includes an ultrasonic transducer, a transmitting circuit, a receiving circuit, a Q-factor measuring circuit, and a frequency measuring circuit. The ultrasonic transducer is a three-terminal ultrasonic transducer that includes a transmitting electrode, a receiving electrode, and a common electrode. The transmitting circuit outputs a driving signal to the transmitting electrode to cause the ultrasonic transducer to transmit ultrasonic waves. The receiving circuit receives a receive signal from the receiving electrode. The frequency measuring circuit measures a resonant frequency of the ultrasonic transducer from a reverberation signal in the receive signal. The Q-factor measuring circuit measures a Q factor of the ultrasonic transducer from the reverberation signal in the receive signal.