This page is updated frequently with new Resonance Frequency-related patent applications.
|Speaker impedance monitoring|
A speaker impedance may be determined by monitoring a voltage and/or current of the speaker. The calculated impedance may be used to determine whether the mobile device containing the speaker is on- or off-ear.
Cirrus Logic, Inc.
|Parallel rc circuit equalizers|
Disclosed are apparatus and methodology for increasing the resonance frequency and useful frequency range of surface mount rc equalizer devices. The presently disclosed subject matter provides improved operational characteristics of generally known such rc equalizer devices by implementing a reverse geometry that relocates the internal termination points, as well as external termination points for such devices, along lateral portions of the assembled device.
|Wireless power receiving device and apparatus including the same|
A wireless power receiving device includes a first resonance circuit configured to have a first resonance frequency; a second resonance circuit configured to have a second resonance frequency lower than the first resonance frequency; and a rectifying circuit connected to the first resonance circuit and the second resonance circuit without a switch and configured to rectify power received through the first resonance circuit and the second resonance circuit.. .
Samsung Electro-mechanics Co., Ltd.
|Compliance chambers for marine vibrators|
A marine vibrator may include a containment housing, a sound radiating surface, and a compliance chamber. The compliance chamber may include a compliance chamber housing, a non-linear linkage assembly, and a low pressure chamber.
Pgs Geophysical As
|Ultrasonic transducer and transdermal delivery system|
A transdermal delivery system including a first passive portion containing a substance for delivery in a reservoir and a second active portion that includes an ultrasonic source. The ultrasonic source includes piezoelectric element(s) that receive electrical stimulation and move radially.
Actuated Medical, Inc.
|Ladder-type elastic wave filter having series and parallel resonators|
In a ladder-type elastic wave filter, a resonance frequency of a second parallel resonator is higher than that of a series resonator and lower than an antiresonance frequency of a series resonator. With this configuration, an attenuation pole is formed by the second parallel resonator at a frequency region lower than an attenuation pole formed by the series resonator in a frequency region higher than the passband of the ladder-type elastic wave filter..
Skyworks Panasonic Filter Solutions Japan Co., Ltd.
|Acoustic ambient temperature and humidity sensing|
Acoustic ambient temperature and humidity sensing based on determination of sound velocity is described, in addition to sensors, algorithms, devices, systems, and methods therefor. An exemplary embodiment employs sound velocity in the determination of ambient temperature and humidity.
|Wireless power transmission and charging system, and resonance frequency control wireless power transmission and charging system|
A wireless power transmission and charging system, and a communication method of the wireless power transmission and charging system are provided. In one embodiment, a resonance frequency control method of a wireless power transmitter may include: generating communication power used for communication in a plurality of target devices using a reference resonance frequency; transmitting communication power to the plurality of target devices; transmitting charging power to the plurality of target devices; and adjusting the reference resonance frequency based on a reflected wave of the charging power, the amount of power received by one or more of the target devices, the amount of the charging power, the transmission efficiency of the charging power, or any combination thereof..
Samsung Electronics Co., Ltd.
|A time variant antenna for transmitting wideband signals|
A circuit for tuning a resonance frequency of an electrically small antenna. The circuit includes a first source configured for providing a modulation signal, a second source configured for providing a periodic electrical signal, an antenna, and a tuning circuit configured for modulating a resonance frequency of the antenna in response to the modulation signal.
Virginia Tech Intellectual Properties, Inc.
|Loop-shaped antenna and mobile terminal|
A loop-shaped antenna is disposed in a mobile terminal, where the mobile terminal includes a metal back cover at least partially covers the loop-shaped antenna; the loop-shaped antenna includes a feeding matching circuit, a grounding circuit, and a radiation portion, where the radiation portion is connected between the feeding matching circuit and the grounding circuit, and the radiation portion is of a symmetrical loop-shaped structure; the grounding circuit includes a switch component and a inductor, where the switch component and the inductor are connected in parallel and between ground and the radiation portion; the feeding matching circuit includes a feeding end and a variable capacitor, where the variable capacitor is connected between the feeding end and the radiation portion; and the feeding matching circuit is configured to adjust impedance matching of the loop-shaped antenna, and the grounding circuit is configured to adjust a resonance frequency of the loop-shaped antenna.. .
Huawei Device Co., Ltd.
A resonator filter according to a first exemplary embodiment of the present invention includes: a cover formed with a first coupling hole; a housing connected to the cover to form an inner space and having a second coupling hole formed at a bottom of the inner space; a dielectric material mounted around the second coupling hole in the bottom of the inner space of the housing; a first rod inserted to the first coupling hole to be connected to the cover and pressing the dielectric material; and a second rod inserted to the second coupling hole to be connected to the housing to be close to the dielectric material and tuning a resonance frequency by controlling a separation distance from the first rod.. .
Electronics And Telecommunications Research Institute
Beat detection and enhancement
A system encourages experimentation with audio frequency and speaker technologies while causing an inanimate figure to appear to dance. The system applies a bandpass filter to an incoming audio stream (e.g., in a low frequency bass band).
Antenna apparatus and wireless communication system
Disclosed is an antenna apparatus and a wireless communication system. According to one implementation, the antenna apparatus includes, a near field communication antenna and a cable that is connected to the near field communication antenna.
Mitsumi Electric Co., Ltd.
Parameter setting method and parameter setting positioning apparatus, and positioning apparatus provided with the parameter setting apparatus
A parameter setting apparatus includes a calculator calculating a first resonance frequency ωr1 of a structure composed of a table, a rotor of a drive motor, and an object and a second resonance frequency ωr2 of a structure composed of a stator of the drive motor and a base using equations given below, and a setter setting a frequency band to be removed for a first damping filter based on the calculated first resonance frequency ωr1 and setting a frequency band to be removed for a second damping filter based on the second resonance frequency ωr2.. .
Dmg Mori Co., Ltd.
A bezel abutting a peripheral edge of a display region of a liquid crystal panel having the display region on one surface, and a bl chassis holding the liquid crystal panel from the other surface side of the liquid crystal panel are fastened to each other by a plurality of fastening members to form a housing. Each of the fastening members is selected from a plurality of types of the fastening members having different electrical resistance values for each fastening location so that a resonance frequency of the housing does not coincide with a frequency of the electromagnetic wave noise radiated from the housing..
Sakai Display Products Corporation
Oscillator, electronic apparatus, and moving object
An oscillator includes a resonator element; an oscillation circuit which outputs an oscillation signal by oscillating the resonator element; and a temperature compensation circuit as a frequency control circuit which controls an oscillation frequency of the oscillation signal, wherein, if a resonance frequency of the resonator element is referred to as fr (mhz) and an equivalent series capacitance is referred to as c1 (ff), a relationship of c1≧0.00279×fr2−0.05684×fr+2.69481 is satisfied.. .
Seiko Epson Corporation
Parameter setting positioning apparatus and positioning apparatus
A positioning apparatus includes a parameter setter for setting control parameters used by the positioning apparatus. The parameter setter executes a resonance frequency detection processing to detect a resonance frequency which occurs when a movable rest having an object to be moved attached thereto is moved and an inertia estimation processing to estimate an inertia which acts on the movable rest when the movable rest having the object to be moved attached thereto is moved, and executes a processing of setting a frequency band to be removed by a notch filter and a speed gain used in a speed controller based on the detected resonance frequency and a processing of setting a processing a rapid feed time constant based on the estimated inertia..
Dmg Mori Co., Ltd.
Sensor, detecting magnetic substance, and image forming apparatus
The sensitivity of a sensor that detects the amount or density of magnetic substance is raised. The sensor includes an oscillation circuit, a differential transformer, and an amplification circuit.
Kyocera Document Solutions Inc.
Common mode filter
A common mode filter includes a first filter and a second filter formed by a magnetic coupling between primary coils and secondary coils, respectively, and connected in series. In the common mode filter, a resonance frequency f1 of the first filter and a resonance frequency f2 of the second filter are different from each other..
Samsung Electro-mechanics Co., Ltd.
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Method and apparatus to change resonance frequency of an electronic device
An electronic device may include a motor to operate at a first frequency during a first time period and to operate at a second frequency during a second time period, and an accelerometer to obtain first data relating to operation of the motor at the first frequency and to obtain second data relating to operation of the motor at the second frequency. The electronic device may also include a processor to determine a desired resonant frequency of the motor based on the first data and the second data..
Power conversion device
The resonant inverter circuit includes two or more switch elements. A detector detects an output current of the switch elements.
Mitsubishi Electric Corporation
Unit current transformer device and magnetic induction power supplying device for linearly controlling output power by using the same
The present invention relates to a unit current transformer device and a magnetic induction power supplying device, and particularly to a magnetic induction power supply unit capable of linearly adjusting output power according to the number of unit current transformer devices configured to have a specific resonance frequency. To this end, the unit current transformer device includes a current transformer inducing secondary current from primary current flowing through a line in a magnetic induction manner and having a resonant frequency double or greater than that of the primary current, and a converting unit converting an output of the current transformer to dc power..
Tera Energy System Solution Co. Ltd
Pellicle aging estimation and particle removal from pellicle via acoustic waves
A pellicle is disposed over a lithography mask. An acoustic wave generator is placed over the pellicle.
Taiwan Semiconductor Manufacturing Company, Ltd.
Method of manufacturing rotor
A method of manufacturing a rotor according to the present invention includes: a process of stacking a plurality of electromagnetic steel plates on a jig 30 to fix the electromagnetic steel plates to the jig 30, and a process of inserting magnets 21 into a plurality of respective openings 11 included in a rotor core 10 in which the plurality of electromagnetic steel plates are stacked on one another. The magnets 21 are inserted into the respective openings 11 while a structure 80 including the rotor core 10 and the jig 30 is vibrated at a resonance frequency of the structure 80..
Toyota Jidosha Kabushiki Kaisha
Closed loop controller and fast scanning probe microscopy
A method of operating a metrology instrument includes generating relative motion between a probe and a sample at a scan frequency using an actuator. The method also includes detecting motion of the actuator using a position sensor that exhibits noise in the detected motion, and controlling the position of the actuator using a feedback loop and a feed forward algorithm.
Bruker Nano, Inc.
Mobile terminal charging device and vehicle equipped with same
A controller of a mobile terminal charging device compares a resonance frequency or a resonance voltage of each of a plurality of foreign object detection coils with a reference resonance frequency or a reference resonance voltage of each foreign object detection coil, stored in a memory, corresponding to a position of a charging coil. The controller performs a safety operation on the basis of a comparison result..
Panasonic Intellectual Property Management Co., Ltd.
Optical image scanning component and microscope device
An optical image scanning component is suitable to receive a light provided by a light source of a microscope device and comprises a first scanning unit and a second scanning unit. The first scanning unit comprises a first scanning mirror rotated along a first direction as axis at a first resonance frequency.
Air-spring compensation in a piston-type marine vibrator
Embodiments relate to the restriction of gas flow in a piston-type marine vibrator to compensate for air-spring effects. An embodiment provides marine vibrator comprising: a containment housing; a piston plate; a fixture coupled to the containment housing; a mechanical spring element coupled to the piston plate and to the fixture; a driver coupled to the piston plate and to the fixture; and a variable gas flow restrictor disposed in an interior volume of the marine vibrator, wherein the marine vibrator has a resonance frequency selectable based at least in part on the variable gas flow restrictor..
Pgs Geophysical As
Piston integrated variable mass load
Embodiments relate to relate to marine vibrators that incorporate one or more piston plates that act on the surrounding water to produce acoustic energy. An example marine vibrator may comprise: a containment housing; a piston plate; a fixture coupled to the containment housing; a mechanical spring element coupled to the piston plate and the fixture; a driver disposed in the marine vibrator, wherein the driver is coupled to the piston plate and the fixture; and a container coupled to the piston plate, wherein the container is configured to hold a variable mass load; wherein the marine vibrator has a resonance frequency selectable based at least in part on the variable mass load..
Pgs Geophysical As
Antenna device of electronic apparatus
An antenna device of an electronic apparatus, according to embodiments of the present invention, includes radiation patterns comprising: at least one open boundary; and a plurality of radiation sections having the open boundary placed and arranged therebetween, wherein the radiation pattern forms a resonant frequency in a first frequency band (hereinafter, referred to as “a first resonance frequency”) and at least one among the radiation sections can form a resonant frequency in a second frequency band (hereinafter, referred to as “a second resonant frequency band”) higher than the first resonant frequency. The antenna device of the electronic apparatus, according to the present invention, can be implemented through other various embodiments..
Samsung Electronics Co., Ltd
Bistable piezoelectric cantilever vibration energy generator based on spherical composite structure and partial separation of different layers
Implementations herein relate to a bistable piezoelectric cantilever vibration energy generator based on spherical composite structure with partial separation of different layers that includes a beam bracket and a shell. The shell is spherical, the bottom of the shell has a circular opening.
Beijing University Of Technology
Temperature sensor using piezoelectric resonator and methods of measuring temperature
A method of measuring temperature includes positioning a piezoelectric resonator in an environment exhibiting the temperature to be measured, applying an input signal to the piezoelectric resonator to resonate the piezoelectric resonator, varying a frequency of the input signal over a range of input frequencies, determining the resonance frequency of the piezoelectric resonator, and determining the temperature of the environment by referencing the resonance frequency of the piezoelectric resonator. The resonance frequency of the piezoelectric resonator changes according to a change in the temperature of the environment and the resonance frequency of the piezoelectric resonator corresponds to the temperature of the environment..
California Institute Of Technology
Antenna and mobile terminal
An antenna, including a first radiation part, a matching circuit, and a feed source, where the first radiation part includes a first radiator, a second radiator, and a capacitor structure, a first end of the first radiator is connected to the feed source using the matching circuit, the feed source is connected to a grounding part, a second end of the first radiator is connected to a first end of the second radiator using the capacitor structure, a second end of the second radiator is connected to the grounding part, the first radiation part is configured to generate a first resonance frequency, and a length of the second radiator is one-eighth of a wavelength corresponding to the first resonance frequency which helps to reduce an antenna length, and a volume of a mobile terminal.. .
Huawei Device Co., Ltd.
Magnetic resonance imaging apparatus
In one embodiment, an mri apparatus includes a gradient generation circuit configured to apply a gradient pulse according to a pulse sequence in which application of an rf pulse and application of the gradient pulse are included; and an rf transmission circuit configured to (a) perform modulation on a controlled output waveform of the rf pulse in such a manner that the controlled output waveform of the rf pulse follows time variation of a magnetic resonance frequency caused by time variation of an eddy-current magnetic field estimated from a waveform of the gradient pulse and (b) apply the rf pulse subjected to the modulation to an object.. .
Toshiba Medical Systems Corporation
Vibration sensor and pulse sensor
A bpf connected to a pulse wave generator has a bandwidth encompassing the fluctuation range of the resonance frequency of a helical antenna. As a result, even if the resonance frequency of the helical antenna fluctuates by a human body approaching the helical antenna, one or a number of a plurality of frequencies of signals passing through the bpf can pass through the bandwidth of the helical antenna..
Kyushu Institute Of Technology
Resonant inverter and switching power source unit
A resonance inverter includes a first coil provided between an input terminal and a switch element, a first capacitor provided between the drain and the source of the switch element, a second capacitor serially connected between the drain and the source of the switch element, and a second coil. A drain-source voltage of a switch element can be effectively lowered, by setting a serial resonance frequency based on the second coil and the second capacitor to a value higher than twice of a driving frequency, and lower than 2.75 times thereof..
Mobile-terminal charging device and vehicle provided with same
In a mobile-terminal charging device, a controller performs a safety operation in a case where a resonance frequency detected by a foreign object detection coil corresponding to a location where a charging coil is present is higher than a reference resonance frequency stored in a memory, or a resonance voltage detected by a foreign object detection coil corresponding to a location where the charging coil is present is lower than a reference resonance voltage stored in the memory.. .
Panasonic Intellectual Property Management Co., Ltd.
Drive apparatus, electronic device, drive control program, and drive signal generating method
A drive apparatus includes a memory to store waveform data representing a sinusoidal drive signal satisfying a frequency f1=(m/n)×q(t) (m and n: natural numbers, m≠n), to vibrate a vibration-generating device m times, where q(t) is a time characteristic of a resonance frequency of the vibration-generating device, or ((m/2)×r) times (r: natural number≠0, m and n: positive odd, m≠n), the vibration-generating device having the resonance frequency varying depending on an acceleration amplitude in a range between first and second resonance frequencies including the rated value f0; and a drive-processor to output the drive signal to the vibration-generating device. The q(t) is obtained when driving the vibration-generating device by a sinusoidal drive signal satisfying f1=(m/n)×f2, to vibrate the vibration-generating device m times if m≠n, or ((m/2)×r) times..
Rotary drive device and image forming apparatus
A rotary drive device includes a drive motor and drive transmission portion, which transmits a rotational drive force of the motor to a driven rotor and includes three or more drive transmission members. A high stiffness member is attached to a low-stiffness drive transmission member, which is one, lower in stiffness, of two of the drive transmission members, to increase stiffness of the low-stiffness drive transmission member.
Ricoh Company, Limited
Automated determination of the resonance frequencies of protons for magnetic resonance examinations
In a method and a magnetic resonance (mr) system for automated determination of the resonance frequency of a nucleus for magnetic resonance examinations, at least one mr signal is detected, and is fourier-transformed into a spectrum composed of elements that can be represented as a vector. An analysis of the spectrum is conducted, wherein at least two cross-correlation coefficients of at least one model spectrum are determined by use of the measured spectrum.
Control electrical converter with lc filter
An electrical converter is interconnected via a filter with an electrical load or an electrical power source. A method for controlling the converter comprises the steps of: receiving a reference flux (ψ*i) for the electrical converter; determining output signals (y) comprising currents and/or voltages measured in the filter; determining an estimated flux (ψi) from the output signals (y); determining a corrective flux (ψi,damp) from the output signals (y) based on a mathematical model of the filter and a quadratic cost function; determining control input signals (u) for the electrical converter based on a sum of the estimated flux (ψi) and the corrective flux (ψi,damp); controlling the converter with the control input signals (u); and algorithmic filtering of at least one of the output signals (y) by applying a signal filter to the at least one output signal, which is designed for amplifying the at least one output signal at a resonance frequency of the filter, whereby the corrective flux (ψi,damp) is determined from the filtered output signals..
Abb Technology Ag
Akinetic swept laser fast sweeping of the same
The present invention discloses a method and apparatus for producing a narrow line laser emission that can be tuned at frequency rates exceeding 100 khz. The laser apparatus is capable of fast scanning speeds close to multiples of the cavity resonance frequency.
University Of Kent
Servo controller for measuring lubrication characteristics of a machine by experimental modal analysis
A servo controller includes: a sinusoidal wave disturbance input unit for supplying a sinusoidal wave disturbance to a speed control loop including a speed command generator, a torque command generator and a speed detector; a frequency response calculator for estimating the gain and phase from the output of the speed control loop; a resonance frequency detector for detecting resonance frequencies at which the gain becomes maximum; a resonance mode characteristics analyzer for estimating resonance characteristics from the frequency response; and, a reference modal damping ratio retainer for retaining a reference modal damping ratio as a resonance characteristic corresponding to the reference lubricating condition, and the resonance mode characteristics analyzer calculates lubrication characteristics on the basis of the reference modal damping ratio and the measured modal damping ratio at the resonance frequency corresponding to the reference modal damping ratio.. .
Process for the electromagnetic modification of liquid mineral resources used as sources of power and a device for putting the same into practice
A process for the electromagnetic modification is based on the application of the nuclear magnetic resonance effect when the electromagnetic energy for destroying chemical bonds is lowered, and the frequency selection enables to selectively act on a determined type of molecules. The process uses a two-circuit adjustment of the nuclear magnetic resonance frequency where the first control circuit is used for an accurate adjustment and maintaining of the frequency that breaks the bonds of a specific type of molecules, the second control circuit enabling, with the help of a quality analyzer, to select the type of molecules to be modified..
Samara State Aerospace University
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Audiologic test apparatus and method
An audiologic test apparatus includes: a pump device configured to apply a first pressure to the ear canal; and a processing module for communicatively coupling to the pump device and to a signal generator, wherein the processing module is configured to obtain first acoustic parameter values indicative of an acoustic parameter at the first pressure based on a first broadband signal generated using the signal generator; wherein the pump device is configured to change the first pressure to a changed pressure, and wherein the pump device is also configured to apply a second pressure to the ear canal; and wherein the processing module is also configured to obtain second acoustic parameter values indicative of the acoustic parameter at the second pressure based on a second broadband signal generated using the signal generator, and determine a middle ear resonance frequency based on the first and second acoustic parameter values.. .
Gn Otometrics A/s
Power converter and cooking apparatus including the same
A power converter and a cooking apparatus including the same are disclosed. The power converter includes a switching unit to perform switching using a direct current (dc) voltage and to output an alternating current (ac) voltage, a driving unit to output a high-frequency voltage to a magnetron based on the ac voltage, an output voltage detector to detect an output voltage flowing to the magnetron, and a controller to calculate a frequency command value based on the detected output voltage, to generate a frequency command value by avoiding a resonance frequency when the calculated frequency command value corresponds to the resonance frequency, and to output the generated frequency command value to the switching unit.
Lg Electronics Inc.
Device, system, and frequency generation using an atomic resonator
Some demonstrative embodiments include devices, systems and/or methods of generating a frequency reference using a solid-state atomic resonator formed by a solid-state material including an optical cavity having color centers. A device may include a solid-state atomic clock to generate a clock frequency signal, the solid-state atomic clock including a solid state atomic resonator formed by a solid-state material including au optical cavity having color centers, which are capable of exhibiting hyperfine transition, wherein the solid-state atomic clock may generate the clock frequency signal based on a hyperfine resonance frequency of the color centers..
Dimension 4 Ltd.
Non-contact wireless communication coil, transmission coil, and portable wireless terminal
In a coil unit, a first magnetic body 11, a first coil 12 for non-contact power transmission, a second magnetic body 21, a substrate 30, and a second coil 22 for non-contact wireless communication are laminated in this order in the thickness direction of the coils. The first coil 12 and the second coil 22 at least partially overlap each other.
Panasonic Intellectual Property Management Co., Ltd.
A vibration system of a loudspeaker
The present invention discloses a vibration system of a loudspeaker, comprising a diaphragm and a voice coil attached to one side of the diaphragm, wherein the diaphragm comprises at least two layers of polyether-ether-ketone base films, and furthermore, the diaphragm comprises at least one layer of crystallized polyether-ether-ketone base film and at least one layer of non-crystallized polyether-ether-ketone base film. The diaphragm made of both crystallized and non-crystallized polyether-ether-ketone base films can have both an effectively improved acoustic performance and a lowered resonance frequency f0, thus, the acoustic effect of the loudspeaker can be improved.
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Power transmission device
The power transmission device includes a first power transmitter and a second power transmitter that respectively adjust the capacitance such that a resonance frequency is attained, based on a variation degree of a phase difference with respect to a variation of the capacitance when the capacitance of a variable capacitance unit is varied, and the first control unit adjusts the resonance frequency of the first power transmitter in a state where the second power transmitter is off, and the second control unit adjusts the resonance frequency of the second power transmitter in a state where the first power transmitter is off.. .
Torsional vibration resonance frequency measurement estimating stability of dental implant and novel amplitude transformer
The present invention relates to a torsional vibration resonance frequency measuring method and a novel amplitude transformer for assessing the stability of dental implants. In one example, a torsional vibration resonance frequency measuring method includes installing an amplitude transformer on a dental implant, energizing a torsional vibration mode, gathering resonance signals, and analyzing a resonance frequency.
The Fourth Military Miedical University Of Chinese People's Liberation Army
Low-profile cavity broadband antennas having an anisotropic transverse resonance condition
Embodiments of the present invention relate to low-profile broadband antennas having an anisotropic traverse resonance condition. One important aspect of the invention is the incorporation of an anisotropic high index medium material, at least partially loaded within the cavity, which is configured to maintain a constant resonance frequency of the antenna.
U.s. Army Research Laboratory Attn: Rdrl-loc-i
Low-profile, tapered-cavity broadband antennas
Embodiments of present inventions relate to low-profile, tapered cavity broadband antennas. One important aspect of the invention (although not the only) is the incorporation of a tapered lateral sidewalls in the antenna cavity.
U.s. Army Research Laboratory Attn: Rdrl-loc-i
Compliance chamber with linear motor for marine acoustic vibrators
Provided are marine acoustic vibrators and methods of using marine acoustic vibrators. An example marine acoustic vibrator comprises a sound radiating surface operable to produce a resonance frequency, wherein the sound radiating surface at least partially defines a marine acoustic vibrator internal volume, wherein the marine acoustic vibrator internal volume comprises a marine acoustic vibrator internal gas having a marine acoustic vibrator internal gas pressure; a compliance chamber, wherein the compliance chamber comprises a compliance chamber internal volume, and a spring function system; a linear motor operable to adjust the compliance chamber internal volume; wherein pressure variations in the marine acoustic vibrator internal volume generated by actuation of the sound radiating surface induce the spring function system and the linear motor to adjust the compliance chamber internal volume such that the pressure variations in the marine acoustic vibrator internal volume are reduced..
Pgs Geophysical As
System for detecting a gas and method therefor
An apparatus and method for detecting a gas with high sensitivity, high snr, and low cost is disclosed. Embodiments of the present invention include sensor nodes that communicate with a common controller, where each sensor node includes a resonant sensor that comprises a resonator having a selectively chemisorptive layer disposed upon it.
Case Western Reserve University
Device and estimating tire pressure of vehicle
Disclosed are a tire pressure estimating method and a tire pressure estimating device. The tire pressure estimating method of a tire pressure estimating device that stores a pca weighting coefficient to perform the principle component analysis (pca) and an lda discriminant coefficient to perform the linear discriminant analysis (lda) for an fft signal pattern of a resonance frequency band of an fast fourier transform (fft) signal obtained through the fft of a wheel speed signal, in order to distinguish between a plurality of tire pressure states, may include: detecting the wheel speed signal through a wheel speed sensor; performing the fft for the detected wheel speed signal; projecting an fft signal pattern of the resonance frequency band of the fft signal onto a pca space by using the pca applied with the stored pca weighting coefficient; and performing the lda applied with the stored lda discriminant coefficient with respect to the data that is projected onto the pca space to then determine a tire pressure state corresponding to the data projected onto the pca space..
Fluid-filled vibration damping device
A fluid-filled vibration device including a pressure receiving chamber and an equilibrium chamber communicated by an orifice passage and a connecting hole provided on a partition member partitioning the two chambers. The connecting hole is closed by a closing rubber elastic plate to which pressures of the two chambers are applied from the respective sides.
Sumitomo Riko Company Limited
Inductive power supply with device identification
An inductive power supply system to identify remote devices using unique identification frequencies. The system includes an aips and a tank circuit capable of inductively providing power to a remote device at different frequencies, and a sensor for sensing the reflected impedance of the remote device at tank circuit.
According to one embodiment, a chip card is described including a chip, an antenna, a coupling structure configured to transmit energy from the antenna to the chip and a control element configured to control, depending on a field strength of a magnetic field to which the chip card is exposed, at least one of the resonance frequency of the antenna, the quality factor of the antenna and an energy transmission efficiency of the coupling structure.. .
Wafer clamp detection based on vibration or acoustic characteristic analysis
A workpiece clamping status detection system and method for detecting a clamping state of a clamping device is provided. A clamping device having a clamping surface is configured to selectively clamp a workpiece to the clamping surface.
Optical filter device, optical module, and electronic equipment
A variable wavelength interference filter is fixed to the base, and the fixing material fixes at least one of the substrates to the base via at least one location of one surface side along a substrate thickness direction. A first order resonance frequency of the variable wavelength interference filter in which a fixing position of the fixing material is used as a fixed end is less than or equal to half a value of a first order resonance frequency of the movable section..
Method for damping resonant component of common-mode current of multi-phase power converter
The present disclosure describes a method and arrangement for damping a resonant component of a common-mode current of a multi-phase power converter comprising an output filter with a virtual ground connection to the power converter. In the method and arrangement, the common-mode current is determined, a feedback signal is formed on the basis of the common-mode current, and the feedback signal is injected into a common mode current reference in order to dampen the resonance frequency component.
Inductive rotary joint with multimode inverter
An inductive power transfer circuit or inductive rotary joint has an inductive rotating coupler with a primary side and a primary winding rotatably arranged against a secondary side and a secondary winding. The secondary side is connected via a rectifier to a load.
Acoustic measurement of wellbore conditions
A method of measuring fluid flow conditions in a wellbore includes generating an acoustic probe signal during fluid flow along the wellbore, measuring the performance attribute of the acoustic probe signal within a target frequency range, and of the fluid medium in at least a part of the wellbore based on the measured performance parameters. The target frequency range of the acoustic probe signal encompasses a bubble resonance frequency range for vapor bubbles in the wellbore, for example having frequencies in excess of 20 khz.
Determining resonance frequency and quality factor
Methods and apparatus for obtaining data from a density-viscosity (dv) sensor of a downhole tool, wherein the dv sensor comprises a resonating element disposed in a fluid flowing in a flowline of the downhole tool, and determining a resonance frequency and quality factor of the resonating element utilizing a nonlinear regression and/or a plurality of resonance modes exhibited by the obtained data.. .
Acoustic wave intraocular pressure detecting device and method thereof
The present invention provides an acoustic wave intraocular pressure detecting device and a method thereof, which uses a driver to generate a vibration wave on the skin or bones. The energy of the vibration wave is transmitted to the orbital bones via the skin and the skeletons.
Noise cancellation resonator
In order to provide a noise cancellation resonator that is highly effective in reducing noise, a noise cancellation resonator of the present invention is characterized by including: a noise cancellation resonator coil with an inductance component of ln; and a noise cancellation resonator capacitor with a capacitance component of cn, wherein the noise cancellation resonator has a resonance frequency that is calculated by adding a shift frequency that is determined based on a degree of coupling between a main resonator coil and the noise cancellation resonator coil, to a predetermined frequency of an electromagnetic field generated by a main resonator that is a source of noise and includes the main resonator coil.. .
Equos Research Co., Ltd.
An electronic device that has a circuit network therein and conducts at least one of power reception and communication with an external device through a wire harness includes a detection circuit and a resonance frequency shift circuit. The detection circuit detects a voltage variation caused by a noise that has a frequency component near a resonance frequency and superimposes on at least one of the wire harness and the circuit network.
Servo control device having automatic filter adjustment function based on experimental modal analysis
A servo control device includes: a speed control loop including a speed command generating unit, a torque command generating unit, and a speed detecting unit; a sine wave disturbance input unit; a frequency response calculating unit estimating a gain and phase of speed control loop input/output signals; a resonance frequency detecting unit; a resonance mode characteristic estimating unit estimating resonance characteristics from the frequency response at a resonance frequency and frequencies therearound; a rigid-body mode characteristic estimating unit estimating rigid-body characteristics from the frequency response in a low-frequency band; a filter attenuating a component in a particular frequency band in a torque command; and a filter adjusting unit making setting so that the filter has specified characteristics. The filter adjusting unit further includes a filter adjusting part attenuating a component in a frequency band corresponding to a resonance mode estimated by the resonance mode characteristic estimating unit..
Geophone with tunable resonance frequency
An illustrative geophone with tunable resonance frequency includes a first inductive assembly including an inductive coil having a first magnet arranged therein, wherein the first magnet and the first inductive coil move relative to each other, and a second inductive assembly including a second inductive coil having a second magnet arranged therein, wherein the second magnet and the second inductive coil move relative to each other. A coupling element couples a movable element of the first inductive assembly with a moveable element of the second inductive assembly.
Halliburton Energy Services, Inc.
Laminate design-based radio frequency coil unit for mri
A radio frequency coil unit (10) for use in a magnetic resonance imaging system, the radio frequency coil unit (10) comprising: at least one electrically insulating substrate (18); at least one radio frequency coil member (12) disposed at a first side (22) of the electrically insulating substrate (18); a first capacitor member (26) disposed at the first side (22) of the electrically insulating substrate (18) and galvanically connected to the at least one radio frequency coil member (12); a second capacitor member (28) disposed at a second side (24) of the electrically insulating substrate (18) which is opposite of the first side (22); wherein the first capacitor member (26) and the second capacitor member (28) at least partially overlap in a direction (20) perpendicular to a sur face of the electrically insulating substrate (18); and wherein the at least one radio frequency coil member (12), the first capacitor member (26) and the second capacitor member (28) are part of a radio frequency resonance circuit having a resonance frequency that coincides with the larmor frequency, which is determined by a magnetic field strength of the magnetic resonance imaging system and the species of nuclei under investigation. The capacitor structure at the second side of the substrate has an integrated resonant loop structure of which the resoance properties are indicative of the capacitor values formed by the overlapping capacitor members..
Koninklijke Philips N.v.
Phase-locked loop with an adjustable output divider
An apparatus relates generally to providing a divided signal output. In such an apparatus, a controller is coupled to receive a reference frequency count and a feedback frequency count to determine a difference therebetween to provide a control setting.
Bulk acoustic wave resonator and filter
A bulk acoustic wave resonator and a filter in which partial thicknesses of protection layers or reflection layers thereof are differently formed are provided. The bulk acoustic wave resonator includes a bulk acoustic wave resonating part comprising a piezoelectric layer, and a reflection layer configured to reflect waves of a resonance frequency generated by the piezoelectric layer based on a signal applied to the bulk acoustic wave resonating part.
Samsung Electro-mechanics Co., Ltd.
Wireless power supply system
A wireless power supply system has a power sending resonance coil, a power receiving resonance coil, and a relay resonance coil. The power sending resonance coil has a predetermined resonance frequency characteristic, and transmits power wirelessly.
Resonant cavity mode enabled wireless power transfer
An embodiment provides a method of wireless power transmission, including: powering a transmitter that produces electromagnetic waves in a three dimensional structure; selecting a transmission frequency that is a resonance frequency for the three dimensional structure; and transmitting, using the transmitter, electromagnetic waves within the three dimensional structure on the transmission frequency selected. Other systems, methods, apparatuses and products are described and claimed..
Disney Enterprises, Inc.
Position pointer of the electromagnetic induction type and electronic ink cartridge
A position pointer is disclosed, in which an electronic ink cartridge of an electromagnetic induction type is accommodated. The electronic ink cartridge includes a resonance circuit having a coil and a capacitor circuit, and is configured to detect pressure applied to a core member accommodated in the position pointer based on a variation of a resonance frequency of the resonance circuit.
Wacom Co., Ltd.
Optical scanning device and image forming apparatus
An optical scanning device includes a light source configured to emit a light beam; a rotary deflector configured to perform optical scanning by reflecting and deflecting the light beam emitted from the light source while rotating; an optical system forming member configured to form a path of the light beam; and a resonator having a resonance frequency corresponding to a sound generated by rotational drive of the rotary deflector. The rotary deflector is installed in a closed space.
Ricoh Company, Limited
Noncontact resonameter, process for making and use of same
A noncontact resonameter includes: a resonator to: produce an excitation signal including a field; subject a sample to the excitation signal; produce a first resonator signal in a presence of the sample and the excitation signal, the first resonator signal including: a first quality factor of the resonator; a first resonance frequency of the resonator; or a combination thereof, the first resonator signal occurring in an absence of contact between the sample and the resonator; and produce a second resonator signal in a presence of the excitation signal and an absence of the sample, the second resonator signal including: a second quality factor of the resonator; a second resonance frequency of the resonator; or a combination thereof; a circuit in electrical communication with the resonator to receive the first resonator signal and the second resonator signal; and a continuous feeder to: provide the sample proximate to the resonator; dispose the sample intermediately in the field of the excitation signal during production of the first resonator signal; remove the sample from the resonator; and manipulate a position of the sample relative to the resonator in a continuous motion and in an absence of contact between the sample and the resonator.. .
National Institute Of Standards And Technology
High precision reciprocating bob viscometer
A high precision, reciprocating bob viscometer is shown that has two coils (a and b) encircling a reciprocating bob. Coil a is energized with a combined sinusoidal and dc signal, while coil b senses the position of the reciprocating bob, then the functions of coils a and b are reversed.
Cambridge Viscosity, Inc.
Half-tube array vibration energy harvesting method using piezoelectric materials
A piezoelectric transducer for harvesting ambient vibration energy is made up of a curved substructure beam, two half-tube piezoelectric elements and a mass block. One end of the beam is fixed on a vibration base and the other end is attached with the mass block.
Micromechanical resonant switches and charge pumps
A circuit of n micromechanical resonant switches (resoswitches) is presented, which mimics a dickson charge pump to amplify an input voltage to an output voltage of n plus 1 times the input voltage, while avoiding the diode voltage drop and breakdown voltage limitations of cmos-based conventional charge pumps. Important aspects of successful charge pumping are: 1) the long cycle lifetime of resonant micromechanical switches, which has been shown to operate 173.9×1012 cycles, is orders of magnitude higher than non-resonant switches; 2) the use of gated-sinusoid drive excitation to allow a charging period independent of resoswitch resonance frequency; and 3) the use of resonance operation to lower required drive and dc-bias voltages to below the supply voltage.
The Regents Of The University Of California
System and externally calibrated parallel imaging in the presence of an inhomogeneous magnetic field
A system and method for accelerated magnetic resonance imaging (mri) includes controlling an rf system of an mri system to acquire coil calibration data from a subject including a material causing inhomogeneities in a static magnetic field of the mri system when arranged in the bore of the mri system. After acquiring the coil calibration data, the rf system is controlled to acquire imaging data from the subject at multiple different resonance frequency offsets.
Wisconsin Alumni Research Foundation
Dual use of a ring structure as gyroscope and accelerometer
Methods and apparatus for sensing linear acceleration with a mems resonator mass, alone, or concurrently with sensing rate of rotation. A resonator mass, which may be a disk or a ring structure, is driven at a resonance frequency of one of the vibration modes of the resonator mass.
Analog Devices, Inc.
Mechanically actuated panel acoustic system
An electronic device whose enclosure or housing panel is used as part of an acoustic system is described. The panel is divided into several sub-panels.
Pen with inductor
A processing system includes a sensor module and a determination module. The sensor module is coupled to sensor electrodes and is the sensor module configured to drive the sensor electrodes with sensing signals at a first resonance frequency of the pen.
Smart resonating pen
A resonating pen having multiple resonance frequencies includes a first circuit segment including an inductor for the resonance frequencies, a second circuit segment including transistors, where each of the transistors includes a transistor state, and a third circuit segment includes a controller. The controller is configured to alter the transistor state of the transistors to change the resonating pen to a resonance frequency.
Pressure sensor using piezoelectric bending resonators
A pressure sensor including an enclosure and a bending resonator housed in the enclosure. The bending resonator includes a diaphragm connected to the enclosure, a piezoelectric layer on the diaphragm, and an electrode on the piezoelectric layer.
California Institute Of Technology
Power feed device, power reception device and power feed method
Power feed device (100) supplies power to storage battery (152) mounted on vehicle (150), through power receiving unit (154) of vehicle (150). Power supply unit (104) performs preliminary supply to power receiving unit (154) while sequentially changing a frequency, and performs main supply with power larger than in the preliminary supply.
Panasonic Intellectual Property Management Co., Ltd.
Wireless power transmitter, wireless power receiver, wireless power transmission method and wireless power reception method
A wireless power reception method of a wireless power receiver for receiving power from a wireless power transmitter is disclosed. The wireless power receives a connection signal for identifying the wireless power receiver from the wireless power transmitter; transmitting a response signal in response to the connection signal to the wireless power transmitter; negotiating a power transmission condition with the wireless power transmitter; and receiving the power using resonance frequency band according to the negotiated power transmission condition.
Lg Innotek Co., Ltd.
Another tuning heuristic includes monitoring a circuit parameter while sweeping the power source frequency; identifying two frequencies related to two local maximum for the values of the circuit parameter; determining a desired resonance frequency for the wireless power transfer device based on stored information; and adjusting the tuning component to a value that causes the wireless power transfer device when uncoupled to operate at or near the desired resonance frequency.. .
Tuning circuit, tuning method and resonance-type contactless power supply
The present disclosure relates to a tuning circuit, a tuning method and a resonance-type contactless power supply. The resonance-type contactless power supply has the characteristic that an inductor current has a maximum value when it operates at a resonance frequency.
Silergy Semiconductor Technology (hangzhou) Ltd.
Power transmission device, wireless power feeding system, and control method
The present power transmission device performs a power transmission process for transmitting power in a wireless manner through electromagnetic field resonance coupling using a resonance circuit. In a case where a resonance frequency of the resonance circuit set to be the same as a frequency of a power transmission signal which is output as transmission power is deviated during transmission of the power, the present power transmission device detects a direction in which the resonance frequency is deviated and controls the power transmission process on the basis of a detection result thereof.
Renesas Electronics Corporation
Method and balun for trapping rf current on a transmission line after installation
Apparatus and method for a radially attachable rf trap attached from a side to a shielded rf cable. In some embodiments, the rf trap creates a high impedance on the outer shield of the rf cable at a frequency of rf signals carried on at least one inner conductor of the cable.
Life Services, Llc
Compensating electrical harmonics on the electrical grid
The invention relates to a control system for compensating undesired electrical harmonics on an electrical grid. Part of the control system referred to as a harmonic compensator is operatively connected with a power inverter of a power producing unit supplying power to the grid.
Vestas Wind Systems A/s
Tire pressure decrease detection apparatus, method, and program
A tire pressure decrease detection apparatus comprising a rotation speed information detection unit for detecting rotation speed information of wheels of a vehicle, a resonance frequency estimate unit for time-series estimating a torsional resonance frequency of the rotation speed information from the rotation speed information obtained by the rotation speed information detection unit, and a judgment unit for judging a decrease in pressure of tires installed in the wheels based on the estimated torsional resonance frequency. The resonance frequency estimate unit includes a noise removal unit for removing a noise superimposed on a wheel speed signal serving as the rotation speed information for each of the wheels with using an active noise control technology..
Sumitomo Rubber Industries, Ltd.
Exhaust purifying device for internal combustion engine
The device includes an exhaust passage having an upstream end connected to an exhaust port of the engine and a downstream end provided with a catalytic converter, a secondary air passage having a downstream end connected to an intermediate point of the exhaust passage and an upstream end communicating with the atmosphere, and a reed valve provided in an upstream end of the secondary air passage to permit air flow from the atmosphere to the exhaust passage but not in the opposite direction. The reed valve has a resonance frequency which is z times the prescribed exhaust frequency of the engine, where z is an integer.
Honda Motor Co., Ltd.
Polyamide resin composition having high melt point and being excellent in anti-vibration property upon water absorption
The present invention provides a polyamide resin composition having high melt point which can produce a molded product having high anti-vibration property or, in other words, having very high resonance frequency and, in particular, being capable of retaining high resonance frequency even upon water absorption. A polyamide resin composition, comprising a polyamide resin (a) having melt point (tm) of 290° c.
Toyobo Co., Ltd.