158results about How to "Cancellation effect" patented technology

A redundently modulated multicarrier protocol known as Carrier Interference Multiple Access (CIMA) is used in an optical-fiber network having wireless links at network nodes. CIMA is a protocol that can be used to create wireless protocols (such as TDMA and CDMA) having enhanced capacity and reduced system complexity. A CIMA optical-fiber network uses dispersion to enhance signal quality and facilitate switching. CIMA achieves both diversity benefits and capacity enhancements by providing redundancy in at least one diversity parameter while providing orthogonality in another diversity parameter. This basic operating principle of CIMA may be combined with multi-user detection to achieve frequency reuse and improved power efficiency. In the wireless link, diversity may be used to reduce the effects of small-scale fading on interferometry multiplexing.

An active noise cancellation helmet includes a detection unit which detects noise in a helmet body, and a sound outputting unit which outputs a sound for canceling the noise detected by the detection unit. A control signal is generated by processing an output signal of the detection unit through computation. The control signal is amplified by an amplification unit, and applied to the sound outputting unit. A ratio of sound pressures in different frequency ranges is determined on the basis of the output signal of the detection unit. A gain of the amplification unit is adjusted on the basis of the sound pressure ratio so as to approximate a spectrum of the output signal of the detection unit to a predetermined target spectrum.

Golf ball locators and components of such locators and methods of operating such locators and processing signals within such locators. In one aspect of the inventions described herein, an exemplary method of initializing a golf ball locator includes receiving received RF signals while also transmitting signals used to locate balls and determining a parameter representative of received signal strength of the received RF signals and setting a threshold to determine when subsequent received signals are to cause an indication of golf ball detection. In another aspect of this disclosure, the golf ball locator is a handheld unit having a volume of less than about 150 inches cubed and includes a transmitter, a transmit antenna, a receiver, a receive antenna and a processor coupled to the transmitter and to the receiver, and the handheld unit achieves a signal isolation, between a second harmonic of a transmitted signal from the transmitter and the receiver's received signal, of greater than about 130 to 160 dB. Other aspects are also described.

Disclosed herein is a signal processing apparatus including: analog-to-digital conversion means for performing delta sigma modulation of generating a digital signal having a predetermined sampling frequency and a predetermined quantization bit rate of one or more bits based on an input analog signal; signal processing means including a digital filter having a characteristic for outputting a digital signal having a sampling frequency n×Fs (Fs is a reference sampling frequency) and a quantization bit rate of a bits (a is a natural number greater than one) based on the above digital signal; and digital-to-analog conversion means including a part for performing delta sigma modulation for outputting a digital signal having a sampling frequency n×Fs and a quantization bit rate of b bits (b is a natural number greater than zero and less than a) based on a digital signal outputted from the signal processing means.

Various embodiments of the invention allow for increased shock robustness in gyroscopes. In certain embodiments, immunity against undesired forces that corrupt signal output is provided by a chessboard-pattern architecture of proof masses that provides a second layer of differential signals not present in existing designs. Masses are aligned parallel to each other in a two-by-two configuration with two orthogonal symmetry axes. The masses are driven to oscillate in such a way that each mass moves anti-parallel to an adjacent proof mass. In some embodiments of the invention, a mechanical joint system interconnects proof masses to suppress displacements due to mechanical disturbances, while permitting displacements due to Coriolis forces to prevented erroneous sensor signals.

Apparatus for use detection of apnea includes a microphone mounted in the ear of the patient for detecting breathing sounds and a second external microphone together with an oximetric sensor. A transmitter at the patient compresses and transmits the signals to a remote location where there is provided a detector module for receiving and analyzing the signals to extract data relating to the breathing. The detector uses the entropy or range of the signal to generate an estimate of air flow while extracting extraneous snoring and heart sounds and to analyze the estimate of air flow using Otsu's threshold to detect periods of apnea and / or hypopnea. A display provides data of the detected apnea / hypopnea episodes and related information for a clinician.

The present invention involves a method and apparatus for canceling the effects of magnetic field noise in a torque sensor by placing three sets of magnetic field sensors around a shaft, the first set of field sensors being placed in the central region of the shaft and the second and third sets of field sensors being placed on the right side and left side of the field sensors placed at the central region, respectively. A torque-induced magnetic field is not cancelled with this arrangement of field sensors but a magnetic near field from a near field source is cancelled.

There is provided a rotary valve for fluid analytical systems. The present valve provides improved characteristics such as an extended lifetime. The valve can fulfil different fluid analytical functions and can be a multi-ports and / or multi-positions valve. The valve is provided with extra recesses in the rotor and extra ports in the stator. These recesses allow to cancel the effect of any possible leaks by evacuating them. Such a valve then prevents cross-port leaks and can advantageously be used in highly critical applications. Moreover, the present valve can be used in an analytical system which is advantageously self-diagnostic.

It is made possible to cancel the effect of the already executed command without performing burdensome operation if an unobjective command is executed for input operation of the user.An input signal analysis section 200 gives a command of execution of a first command corresponding to detection of input operation to a first operation button based on an input position of a touch panel 10 detected by an input signal control section 300 and if input operation to a second operation button is detected, gives a command of a second command corresponding to detection. If continuous input operation to the second operation button is detected after the first command corresponding to the first operation button is executed, and command change notification from the input signal analysis section 200 is received, an application 100 cancels the effect of the immediately preceding executed first command and executes the second command.

A coupled winding cancels parasitic inductance of first and second capacitors. In an EMI filter having common mode capacitors and a differential capacitors, first and second windings cancel parasitic inductance of the common mode and differential capacitors.

The present invention relates to voltage measurement apparatus. The voltage measurement apparatus comprises a potential attenuator configured to be electrically connected between first and second conductors, which are electrically coupled to a source. The potential attenuator comprises a first impedance and a reference impedance arrangement in series with each other. The reference impedance arrangement has an electrical characteristic which is changed in a known fashion. The voltage measurement apparatus further comprises a processing arrangement configured: to acquire at least one signal from the reference impedance arrangement, the at least one signal reflecting change of the electrical characteristic in the known fashion; and to determine a voltage between the first and second conductors in dependence on the fashion in which the electrical characteristic is changed being known and the at least one signal.

The present invention is directed to the provision of a wavelength division multiplexing optical transmission apparatus and, more particularly, to a wavelength division multiplexing optical transmission apparatus having high wavelength stability unaffected by the temperature characteristics, aging, etc. of an arrayed-waveguide grating (AWG) and its peripheral components. The wavelength division multiplexing optical transmission apparatus comprises: an arrayed-waveguide grating 10 having operating input / output ports and an input dummy port; a light emitting means 21 for generating a pilot signal to be input to the input dummy port; a light detecting means 22 for monitoring the pilot signal contained in a wavelength division multiplexed signal output from the operating output port; and a temperature control circuit 11 for controlling the temperature of the arrayed-waveguide grating in such a manner as to cancel the amount of wavelength fluctuation occurring in the arrayed-waveguide grating and detected by monitoring the pilot signal.

A personal flight vehicle including a platform base assembly that provides a surface upon which the feet of an otherwise free-standing person are positionable, and including a plurality of axial flow propulsion systems positioned about a periphery of the platform base assembly. The propulsion systems generate a thrust flow in a direction substantially perpendicular to the surface of the platform base assembly, where the thrust flow is unobstructed by the platform base assembly. The thrust flow has a sufficient intensity to provide vertical takeoff and landing, flight, hovering and locomotion maneuvers. The vehicle allows the pilot to control the spatial orientation of the platform base assembly by the movement, preferably direct, of at least part of his or her body, and the spatial movement of the vehicle is thus controlled.

A beam control system and method. In an illustrative embodiment, the inventive system (500) provides a first beam of electromagnetic energy (503); samples the first beam (503) and provides a second beam (505) in response thereto; detects aberrations in the second beam (505); and corrects aberrations in the first beam (503) in response to the detected aberrations. In a specific implementation, the invention (500) includes a beam director telescope (510) having a primary mirror (516) on which a holographic optical element (518) is disposed. The holographic optical element (518) samples the output high-power beam and provides a sampled beam to a wavefront sensor (520). The wavefront sensor (520) provides signals to an adaptive optics processor (580). The adaptive optics processor (580) analyzes the sampled wavefront, detects aberrations therein and provides a correction signal to an optical phased array (550).

A mobile terminal and controlling method thereof are disclosed, by which a prescribed function of the mobile terminal can be performed through a button manipulation of a stylus pen and a touch input. The present invention includes a short range communication unit configured to receive a plurality of different signals from a stylus pen, a touchscreen, and a controller performing a prescribed function by combining a type of a signal received from the stylus pen among a plurality of the different signals and a touch pattern of the stylus pen recognized on the touchscreen.

An aircraft thickness / camber control device mounts to the lower surface of a airfoil configuration, for example on a fuselage, and extends along a longitudinal axis. The device, when deployed, generates expansions ahead of compressions generated by off-design conditions, inlet spillage for example, and enables maintenance of a low boom signature. The device, when positioned at appropriate locations, may also be used as a drag reduction device. The thickness / camber control device comprises a structural member capable of coupling to the airfoil at a position forward of the concentrated source of added compression and a control element. The control element is coupled to the structural member and controls the structural member to adjust thickness / camber of the configuration to cancel the far-field effect of the extra compression or concentrated pressure source.

An electrical component includes a capacitive impedance and a shunt path inductance cancellation feature provided by coupled windings. A filter having a capacitor with capacitor-path inductance cancellation provides enhanced performance over frequency compared with conventional capacitors.

A vehicle wiper blade and wiper blade assembly having a longitudinal stiffener mounted on the blade body at an offset angle from the central geometric plane of the blade edge, defined by the neck and wiping edge of the blade. When mounted in the presence of a wind stream flowing over the vehicular windshield, the protruding face surfaces of the stiffener function as an air dam to reduce lift-off effects, or as an airfoil to provide a supplemental pressure directing the wiper blade against the windshield. The proximity of the lower, forward edge of the blade to the windshield serves as an air dam. The upper trailing edge of the blade may be extended to serve as an airfoil. Torque about the wiping edge is avoided by directing the wiper arm pressing force in alignment with the central geometric plane of the blade, and preferably through the neck portion of the blade.

According to a data processing device for correcting an image signal which (i) is made up of plural pieces of pixel data and (ii) is externally supplied to a liquid crystal driving panel, a correction circuit includes an interpolation section for (i) obtaining first pixel data to be corrected and second pixel data which is for use in driving one of the plurality of data signal lines at timing earlier than timing at which the one of the plurality of data signal lines is driven in response to the first pixel data and (ii) correcting the first pixel data in accordance with a relationship between the second pixel data and the first pixel data. This provides a data processing device which can carry out a correction so that, in a case where a previously applied voltage have an effect on the charging states of respective pixels connected to a certain data signal line, such an effect is cancelled.

A metal detector employing static discrimination. Within the scope of the invention is a two-frequency method and apparatus for discriminating between metal objects and ground. Also within the scope of the invention is a three-frequency method and apparatus for discriminating between ferrous and non-ferrous metal objects. The methods and apparatus do not require movement of the search head of the metal detector.

Digital to analog converter circuits and methods are provided for producing an analog output voltage indicative of a digital input signal with at least partial insensitivity to error gradients. Described are split-core resistive elements, which include a plurality of one-dimensional or multi-dimensional resistive strings, that may be used to reduce or substantially eliminate the effects that error gradients have on the linearity of the analog output voltages of a resistive string or interpolating amplifier DACs. The resistor strings that make up the split-core resistive elements are configured in such a manner that combining respective output voltages from each of the resistor strings results in an analog output voltage that is at least partially insensitive to the effects of error gradients.

A compact instrument package consisting of a rotating sensor and supporting signal-processing electronics is capable of measuring two-dimensional electric-field vectors, ranging from DC to an arbitrary upper AC frequency not limited by the rotation rate, with highly improved accuracy and sensitivity when compared with previous art. In addition, contrary to previous art, the sensor can measure the electric field gradient at its location. This is achieved by the use of a combination of quadrature modulation and phase-sensitive quadrature demodulation digital signal processing in a generic rotating electric-field sensor. Ground isolated versions of the instrument can be used singly or in arrays when precise measurements of the electric fields are necessary. Either grounded or isolated versions of the instrument can operate continuously without the need for internal batteries, making it extremely attractive for a wide-range of industrial and space applications. Operational modes have been developed to distinguish the effects of ion currents and charged particles impacting the sensor from the local ambient electric field. Moreover, particular versions of the instrument can be operated in corrosive environments and conducting fluids.

An apparatus and method for shielding an operator from electromagnetic fields emitted from an antenna in a portable communication device. A plurality of active shields are placed between the operator's earpiece and the antenna to dampen the effects of the electromagentic fields. The active shields are coupled to adjustment circuits which may include variable gain amplifiers and phase couplers to offset the antenna signal.

A digital telemetry system having improved data rate and robustness. The telemetry system has a data transmission cable having a first end and a second end, and is capable of transmitting data between the first and second end on at least two propagation modes. A data source connected at the first end has data transmission circuitry to generate data signals on these propagation modes. A receiver connected to the second end of the wireline cable has a first receive circuitry to receive signals on a first of the at least two propagation modes and a second receive circuitry to receive signals on a second of the at least two propagation modes. An adaptive far-end cross-talk cancellation circuitry connected to the first receive circuitry and to the second receive circuitry cancels out far-end cross-talk between the at least two propagation modes.

This invention provides a nonvolatile semiconductor memory device including a novel memory core portion in which an influence of a parasitic element component in a memory cell information reading path is excluded in a reading operation, and novel sensing means accompanying this memory core structure, so as to achieve rapid sensing. In the memory core portion, a selected memory cell is selected by a global bit line through a local bit line and an adjacent global bit line is connected to a local bit line in a non-selected sector. A column selecting portion connects a pair of the global bit lines to a pair of data bus lines. A load portion having a load equivalent to a parasitic capacitance of a path leading from the memory cell and for supplying a reference current to a reference side is connected to a pair of the data bus lines. A current of the memory cell information is compared with the reference current by a current comparing portion and a differential current is outputted. A path load is equalized by a pair of adjacent paths so that an effect from noise is canceled, thus making it possible to achieve rapid reading.

Power-supply ripple rejection (PSRR) at high frequencies is improved for an LDO voltage regulator with an NMOS pass transistor (MN1). A ripple voltage (Vripple) present on the input voltage causes a ripple current (Iripple) through parasitic gate-drain capacitance of the pass transistor. A small ripple current (Ifraction) proportional to the ripple current (Iripple) is generated and amplified to generate a cancellation current (Icancel). The cancellation current is drawn from the gate of NMOS pass transistor (MN1) to cancel the ripple current so that no net ripple current flows through the finite output impedance of an error amplifier (2), to thereby achieve the PSRR improvement.

A radar sensor configured to control detonation of a munition is described that includes a radar transmitter comprising a radar transmit antenna, a radar receiver comprising a radar receive antenna, and a leakage cancellation unit. The leakage cancellation unit is configured to cancel effects of an antenna leakage signal transmitted by the radar transmit antenna and received by the radar receive antenna. To cancel the effects of the leakage signal, the leakage cancellation unit is configured to provide a signal to the radar receiver that is substantially out of phase with the leakage signal received by the radar receiver.