508results about How to "High frequency response" patented technology

A device measures pressures in animals and humans and includes a pressure transmission catheter (PTC) filled with a pressure transmitting medium and implantable in an area in having a physiological pressure. A transducer communicates with the pressure transmitting medium to provide a pressure signal representing variations in the physiologic pressure on electrical wires. A connecting catheter carries the electrical wires to signal processing and telemetry circuitry, which transmits a telemetry signal representing the pressure signal to a receiver external to the animal or human. A housing holds the signal processing and telemetry circuitry, but the transducer is remote from the housing. The device is particularly useful in measuring venous pressure, pulmonary pressure, bladder pressure, or intracranial pressure without significant head pressure artifact and with a sufficient dynamic response. One embodiment of the PTC includes a multi-durometer stem.

Digital filters for processing an input audio signal for extending the audio capabilities and reducing distortion of a loudspeaker. Such extension may include a general sound pressure level (SPL) extension or a more targeted low frequency (LF) extension. This may be accomplished by modifying an original frequency response of the loudspeaker to achieve a particular extension, and applying a digital linear filter based on the modified frequency response to the audio signal. A nonlinear digital filter may also be applied to the audio signal reduce nonlinear distortions of the loudspeaker. The nonlinear digital filter may be based on an inverse of an electro-mechanical model of the loudspeaker. In this manner, a loudspeaker may be driven close to its maximum theoretical power capability without increasing distortion in the loudspeaker output.

An integrated disposable cartridge for dialysis or ultrafiltration treatment of blood is disclosed that includes integral miniature pressure sensors. Sensors are embedded in the tubing of the cartridge to measure pressure of blood or other fluids. Cartridge elements form a continuous smooth bore passage for blood that reduces probability of clotting.

According to various embodiments, an audio system having high quality sound and a high frequency response is provided. The audio system comprises one or more speakers with mismatched components. Although the combination of mismatched components may result in a diminished frequency response, digital signal processing may compensate for the physical deficiencies of a driver of the speaker. In some embodiments, an audio system comprises a speaker and a signal processor. The speaker may comprise one or more mismatched speaker components which are operably coupled to each other such that the components, together, have a low frequency response. The signal processor may operably couple to the one or more mismatched speaker components. The signal processor may be configured to process an input signal and to drive the speaker using the processed signal such that the speaker has a higher frequency response than the low frequency response.

The present invention relates to a bone conduction speaker and its compound vibration device. The compound vibration device comprises a vibration conductive plate and a vibration board, the vibration conductive plate is set to be the first torus, where at least two first rods inside it converge to its center; the vibration board is set as the second torus, where at least two second rods inside it converge to its center. The vibration conductive plate is fixed with the vibration board; the first torus is fixed on a magnetic system, and the second torus comprises a fixed voice coil, which is driven by the magnetic system. The bone conduction speaker in the present invention and its compound vibration device adopt the fixed vibration conductive plate and vibration board, making the technique simpler with a lower cost; because the two adjustable parts in the compound vibration device can adjust both low frequency and high frequency area, the frequency response obtained is flatter and the sound is broader.

A VCSEL array device formed of a monolithic array of VCSELs and short circuited mesas is disclosed. The VCSELs can be spaced symmetrically or asymmetrical, in a manner to improve power or speed, or in phase and in parallel. The VCSELs are connected to a first metal contact pad formed on a heat-spreading substrate. The short-circuited mesas are formed alongside the VCSELs and are bonded to and form a short circuit to a second metal contact pad on the grounding substrate. Each VCSEL is encompassed by a thick metal heat sink to increase the height of VCSEL mesas. The structure of the heat sink, the VCSELs and the shorting mesas reduce parasitic impedance thereby increasing output power and high frequency response. The VCSELs and shorting mesas can be packaged as a coplanar waveguide in a ground-signal-ground configuration that improves signal modulation characteristics.

An optical sensor and a method of manufacturing such as sensor are provided. The sensor includes a lead optical fiber with a single piece optical element joined permanently joined to its forward end. The optical element defines a spacer with a cavity therein at one end, and a diaphragm at the opposite end. The diaphragm is flexible in response to a parameter and the sensor defines a sensing Fabry-Perot resonator.

The present application is directed to carbon materials comprising an optimized pore structure. The carbon materials comprise enhanced electrochemical properties and find utility in any number of electrical devices, for example, as electrode material in ultracapacitors. Methods for making the disclosed carbon materials are also disclosed.

A man-machine interface which provides tactile feedback to various sensing body parts is disclosed. The device employs one or more vibrotactile units, where each unit comprises a mass and a mass-moving actuator. As the mass is accelerated by the mass-moving actuator, the entire vibrotactile unit vibrates. Thus, the vibrotactile unit transmits a vibratory stimulus to the sensing body part to which it is affixed. The vibrotactile unit may be used in conjunction with a spatial placement sensing device which measures the spatial placement of a measured body part. A computing device uses the spatial placement of the measured body part to determine the desired vibratory stimulus to be provided by the vibrotactile unit. In this manner, the computing device may control the level of vibratory feedback perceived by the corresponding sensing body part in response to the motion of the measured body part. The sensing body part and the measured body part may be separate or the same body part.

A top emitting VCSEL array may be coupled to a separate heat spreading superstrate that may be positioned above the apertures of the array and that may be able to transmit the emitted beams through the heat spreading superstrate. The VCSEL devices in the array may be controlled by an electrical connection to a pattern of conductive elements positioned in close contact with, but electrically isolated from, the heat spreading superstrate. The conductive elements may electrically control one or more of the VCSEL devices to enable sectional control of the light output. The elements may also be arraigned in a ground-signal-ground or coplanar waveguide configuration to improve the frequency response of the array.

Electromagnetic actuators capable of generating a symmetrical bidirectional force are disclosed. The electromagnetic actuators include a housing made of a ferromagnetic material and a shaft made of a magnetically inert material movable along an axis within the housing. In one type of actuator, captive permanent magnets are arranged on opposite interior end walls of the housing and an electromagnetic coil is mounted on a central portion of the shaft. The electromagnetic coil is capable of generating a force when energized that causes linear displacement of the shaft in either direction along its axis depending on the direction of current through the electromagnetic coil. In another type of actuator, captive electromagnetic coils are arranged on opposing inner end walls of the housing, and a permanent magnet is mounted on a central portion of the shaft. The electromagnetic coils are capable of generating a force when energized that causes linear displacement of the shaft in either direction along its axis depending on a direction of current through the electromagnetic coils.

A VCSEL array device formed of a monolithic array of VCSELs and short circuited mesas is disclosed. The VCSELs can be spaced symmetrically or asymmetrical, in a manner to improve power or speed, or in phase and in parallel. The VCSELs are connected to a first metal contact pad formed on a heat-spreading substrate. The short-circuited mesas are formed alongside the VCSELs and are bonded to and form a short circuit to a second metal contact pad on the grounding substrate. Each VCSEL is encompassed by a thick metal heat sink to increase the height of VCSEL mesas. The structure of the heat sink, the VCSELs and the shorting mesas reduce parasitic impedance thereby increasing output power and high frequency response. The VCSELs and shorting mesas can be packaged as a coplanar waveguide in a ground-signal-ground configuration that improves signal modulation characteristics.

This invention disclosure relates to a conditioning device for improving the frequency response of signals conducted within an in-home cable infrastructure that includes both CATV bandwidth and in-home entertainment bandwidth. Disclosed is a CATV network device which includes a CATV signal transmission path and an in-home entertainment signal transmission path. Also disclosed is a signal conditioning circuit that is placed along the in-home entertainment signal transmission path. The signal conditioning circuit includes at least one LC resonant shunt circuit and at least one LC resonant tank circuit. In a particular embodiment two signal conditioning circuits are used. The CATV network device attenuates and equalizes the in-home entertainment signals transmitted along the in-home entertainment signal path so that the in-home entertainment signals don't interfere with the CATV signals.

A method and apparatus for detecting leaks and mechanical faults by way of an ultrasonic device. An output from a variable gain amplifier is supplied to a pair of heterodyning circuits, i.e., a dual heterodyning circuit. At each respective heterodyning circuit, the output signal from the variable gain amplifier is multiplied by a local oscillator that is internal to each circuit. The dual heterodyning circuit is used to provide an enhanced input transducer signal for spectral analysis. This permits the capture of low level frequency components for extraction during spectral analysis. The dual heterodyning circuit of the present invention to provide the enhanced spectrum to thereby permit an easy determination of whether the resonance is mechanical or electrical becomes clear. In addition, fault frequencies are also more easily discernable. In other words, the enhanced signal output provides a lower signal to noise ratio such that the ease with which frequency components are analyzed is increased.

The invention relates to a three-chain six-freedom parallel flexible hinge micro motion device, wherein it comprises base platform, movable platform, driver on the base platform, and three support rods via flexible joints connected to the driver and movable platform. Said driver comprises three flexible plates on the base platform and piezoelectric ceramic driver connected to the flexible plates; three flexible plates are integrated processed, while each plate is connected to two piezoelectric ceramic drivers in right angle. The invention has compact structure and low installment error.

This invention relates to imaging device and its related transferring technologies to independent substrate able to attain significant broadband capability covering the wavelengths from ultra-violet (UV) to long-Infrared. More particularly, this invention is related to the broadband image sensor (along with its manufacturing technologies), which can detect the light wavelengths ranges from as low as UV to the wavelengths as high as 20 μm covering the most of the wavelengths using of the single monolithic image sensor on the single wafer. This invention is also related to the integrated circuit and the bonding technologies of the image sensor to standard integrated circuit for multicolor imaging, sensing, and advanced communication. Our innovative approach utilizes surface structure having more than micro-nano-scaled 3-dimensional (3-D) blocks which can provide broad spectral response. Utilizing multiple micro-nano scaled blocks help to increase the absorption spectra more than the material used as the absorption layer. In addition, utilizing the multiple nano-scaled 3-D blocks help to increase the absorption over the wavelength due to the multiple reflections and diffractions inside the 3-D structures. The absorption layers will be designed to achieve the required quantum efficiency and also required speed.

An optical sensor and a method of manufacturing such as sensor are provided. The sensor includes a lead optical fiber with a single piece optical element joined permanently joined to its forward end. The optical element defines a spacer with a cavity therein at one end, and a diaphragm at the opposite end. The diaphragm is flexible in response to a parameter and the sensor defines a sensing Fabry-Perot resonator.

An integrated disposable cartridge for dialysis or ultrafiltration treatment of blood includes integral pressure sensors. Sensors are embedded in the blood filter on the cartridge to measure the pressure of blood or other fluids in the filter.

An improved rotary servovalve system employs a rotary magnetic solenoid having an armature that includes at least one permanent magnet. The armature is rotatable relative to a stator formed as an electromagnet which is energizable to create alternative electromagnetic fields having opposite polarities from each other. When deenergized, the stator allows the armature to return to a neutral, null position from positions of extreme rotation in opposite angular directions due to the magnetic force of the permanent magnet of the armature. The armature is coupled to carry a movable valve element in angular rotation therewith, so that flow through the servovalve of the system can occur in alternative directions. Also, the valve element is biased toward a position in which all of the valve ports are closed when power is removed from the rotary solenoid. The control circuit employed in the rotary servovalve system expands the bandwidth of response of the solenoid actuator by compensating for frequency variations in the input command signal and in the feedback signal. This compensation is achieved utilizing a combined proportional, integral, and differential amplification circuit. Also, imbalance of fluid forces within the servovalve mechanism can be avoided by utilizing a pair of inlet orifices, a pair of outlet orifices, a pair of first fluid control orifices, and a pair of second fluid control orifices. The orifices within each pair are located on opposite sides of the valve housing from each other.

An antenna structure including at least one planar antenna element. In place of a balun, the antenna structure further includes a slotline for coupling the planar antenna element with an unbalanced load.

This invention relates to photodetector and its array in the form of a image sensor having multispectral detection capability covering the wavelengths from ultra-violet (UV) or near UV to shortwave infrared (over 1700 nm), ultra-violet (UV) or near UV to mid infrared (3500 nm), or ultra-violet (UV) or near UV to 5500 nm. More particularly, this invention is related to the multicolor detector, which can detect the light wavelengths ranges from as low as UV to the wavelengths over 1700 nm covering the most of the communication wavelength, and also from UV to as high as 5500 nm using of the single monolithic detector fabricated on the single wafer. This invention is also related to the multispectral photodetector arrays for multicolor imaging, sensing, and advanced communication. Our innovative approach utilizes surface incident type (either top- or bottom-illuminated type) photodiode structure having single absorption layer and consisting of more than micro-nano-scaled 3-dimensional (3-D) blocks which can provide broader spectral response than that of the absorption layer made from the same type of material having macro-scaled structure.

A method of adaptive full duplex full frequency band echo cancellation comprises the following steps of: carrying out filtration by a sub-band filter, carrying out sub-band echo cancellation by a sub-band echo canceller, carrying out weighted energy analysis and control on system signals, carrying out analysis and detection on double talk active state, carrying out coefficient updating on an echo filter, carrying out nonlinear processing on residual echo, and carrying out synthesis on signals of sub-bands. The method further comprises the step of maintaining reference signal and echo signal to be synchronous; after the nonlinear processing is carried out, noise reduction, automatic gain control and comfort noise technique can be added. Owing to adoption of the method of echo cancellation, signals are spilt into sub-bands through filtration, thus reducing correlation among signals of sub-bands, improving convergence problem of adaptive filter, reducing data process load of the system, improving processing efficiency of echo cancellation, realizing full duplex of conversation, improving frequency response of communication audio frequency, improving quality of communication and realizing echo cancellation of full frequency band response.

A device measures pressures in animals and humans and includes a pressure transmission catheter (PTC) filled with a pressure transmitting medium and implantable in an area in having a physiological pressure. A transducer communicates with the pressure transmitting medium to provide a pressure signal representing variations in the physiologic pressure on electrical wires. A connecting catheter carries the electrical wires to signal processing and telemetry circuitry, which transmits a telemetry signal representing the pressure signal to a receiver external to the animal or human. A housing holds the signal processing and telemetry circuitry, but the transducer is remote from the housing. The device is particularly useful in measuring venous pressure, pulmonary pressure, bladder pressure, or intracranial pressure without significant head pressure artifact and with a sufficient dynamic response. One embodiment of the PTC includes a multi-durometer stem.

The present invention consists of the particular geometry of the reflectors or dispersers which constitute the anti-radar chaff cloud. Instead of using conventional rectilinear forms, in the present invention multilevel and space-filling forms are introduced. Due to this geometric design, the properties of the radar chaff clouds improve mainly in two aspects: radar cross-section (RCS) and mean time of suspension.

The present invention relates to systems and methods for medical imaging. Digital images are processed to provide phase images of a region of interest to aid in the diagnosis and treatment of various conditions. A preferred embodiment of the invention provides improved mammography screening for cancerous or precancerous conditions.

The invention relates to a real-time on-line monitoring apparatus of blade vibration of a flue gas turbine. The monitoring apparatus comprises blade tip timing sensors, an angle reference sensor, a rotating speed synchronization sensor, a preprocessing system, a data integrated processing card, and a computer. The blade tip timing sensors, the angle reference sensor, and the rotating speed synchronization sensor are connected with the preprocessing system that is connected with the data integrated processing card; and the data integrated processing card is connected with the computer. According to the invention, the sensors employ double-shielded capacitance impulsers; single-core double-shielded wires are utilized as transmission lines of output signals; and a driving cable technology is utilized to effectively reduce a random error introduced by an environmental interference; and a charge amplification circuit is used to extract a capacitance pulse signal, thereby eliminating the system error basically and improving the measurement accuracy of the system.

The invention provides a MEMS package including: a MEMS chip including a first surface, a second surface, a first cavity, and a sensing device, the sensing device defining a first end of the first cavity; a leadframe including a second cavity and being electrically connected to the first surface of the MEMS chip, the second cavity being adjacent to the sensing device of the MEMS chip; a conductive layer disposed on the second surface of the MEMS chip to define a second end of the first cavity and grounded via the leadframe that is electrically connected to the conductive layer so as to provide electromagnetic shielding to the MEMS chip; and an encapsulant covering the MEMS chip, the leadframe, and the conductive layer to define an shape of the MEMS package and allowing outer surfaces of the leadframe to emerge from the MEMS package.

The invention discloses an integrated type six degrees of freedom precision positioning platform. The integrated type six degrees of freedom precision positioning platform comprises a base, a lower platform component, a middle platform component and an upper platform component. The integrated type six degrees of freedom precision positioning platform utilizes a piezoelectric ceramics brake to enable the lower platform component to achieve rectilinear motion along an X direction and a Y direction of a coordinate system, enable the middle platform component to achieve a rectilinear motion along an Z direction of the coordinate system and a rotary oscillation around an axis which is parallel to the X axis and an axis which is parallel to the Y axis, and enables the upper platform component to rotate around the Z axis. The integrated type six degrees of freedom precision positioning platform can achieve precise control position on the six degrees of freedom and effectively avoids displacement coupling among axes due to the fact that the middle platform component and the lower platform component are designed into a symmetric structure. Meanwhile, the transmission platform can achieve integral manufacture, is driven by the piezoelectric ceramics brake, has the advantages of being free from friction and coupling, being high in precision, long in journey and high in resolution rate and can meet complex manufacturing and operation requirements of nanometer science and technology studies.

A motor control apparatus of the present invention comprises a velocity detector for detecting a rotation velocity of a mover of a motor, a position detector for detecting a position of the mover, a differentiator for performing time differentiation with respect to the position detected by the position detector to obtain a velocity calculation value, a feedback signal generating circuit for generating a feedback signal including the velocity detection value obtained by the velocity detector as a high frequency component and the velocity calculation value obtained by the differentiator as a low frequency component, and a linear amplifier and an integrating amplifier for performing PI control, the linear amplifier and the integrating amplifier performing linear amplification and integrating amplification of a difference between the velocity instruction and the feedback signal, respectively.

The invention belongs to the field of micro-drive technology. The present invention proposes a new double-phase opposing giant magnetostrictive driver. A pair of disc springs are sleeved on the output assembly and placed in the middle of the housing. Two single giant magnetostrictive drivers with the same structure and size pass through the The disc springs are symmetrically placed on both sides of the output assembly, forming a double-phase structure. Dual sets of thermal compensation mechanisms are used to suppress thermal deformation, and single-degree-of-freedom flexible hinge mechanisms are used to amplify and transmit the output displacement. The driver works through differential pressure (or bias voltage), which can realize the function of automatic centering and return, with high frequency response , high control precision, large output force, large output displacement and other excellent performances, and the structure is simple and easy to miniaturize, it can be widely used in the development of micro drives and the production of sensors, especially suitable for the drive unit of electro-hydraulic servo control valves .