63 results about "Absolute magnitude" patented technology

A new measurement system, with two receiver channels per measurement port, has been developed that provides absolute magnitude and absolute phase relationship measurements over wide bandwidths. Gain ranging is used at RF to provide optimum noise performance and a swept YIG preselector filter is used to avoid spurious signals. A new absolute vector error correction method is used to calibrate the measurement system in order to allow for absolute vector measurements, and it also removes the time-varying responses caused by the swept YIG preselector filters. A quasi-reciprocal mixer with a characterized non-reciprocal ratio is used to provide the absolute calibration standard. The two receiver channels can be adapted to a wide variety of applications, including wide bandwidth vector signal analyzer measurements, mixer measurements, and harmonic measurements. The two-channels can also be used as an absolute calibrated transmitter/reflectometer.

A detector circuit for determining whether synchronization lock has been optimally achieved in feedback-type control systems. The detector circuit evaluates an error signal developed by a phase/frequency detector and compares the absolute magnitude of the error signal to a first threshold signal corresponding to a magnitude metric. When the value of the error signal is less than the magnitude threshold value, an event signal initiates a time interval counter which continues counting so long as the error signal remains below the magnitude threshold value. The time interval counter continues until it counts to a second threshold value corresponding to a timing metric. At this point, synchronization lock is declared.

A method for controlling the movement of a marine vessel comprises steps that rotate two marine propulsion devices about their respective axes in order to increase the hydrodynamic resistance of the marine propulsion devices as they move through the water with the marine vessel. This increased resistance exerts a braking thrust on the marine vessel. Various techniques and procedures can be used to determine the absolute magnitudes of the angular magnitudes by which the marine propulsion devices are rotated.

An efficient system and method for modulation and demodulation to achieve a high data rate using Bit-Interleaved Coded Modulation and OFDM uses either a coherent or a non-coherent transmission scheme using differential modulation. In order to maintain a high data rate impervious to sudden phase changes, a communication system uses an efficient constellation having multiple rings with different sizes and modulation/demodulation schemes utilizing this constellation. In power line communications, the channel gain information is obtained easily at a receiver (100) while the phase information is not. Thus, the communication system uses an absolute magnitude and differential phase coding for modulation and demodulation of the signals.

A tunnel barrier in proximity with a layer of a rare earth element-transition metal (RE-TM) alloy forms a device that passes negatively spin-polarized current. The rare earth element includes at least one element selected from the group consisting of Gd, Tb, Dy, Ho, Er, Tm, and Yb. The RE and TM have respective sub-network moments such that the absolute magnitude of the RE sub-network moment is greater than the absolute magnitude of the TM sub-network moment. An additional layer of magnetic material may be used in combination with the tunnel barrier and the RE-TM alloy layer to form a magnetic tunnel junction. Still other layers of tunnel barrier and magnetic material may be used in combination with the foregoing to form a flux-closed double tunnel junction device.

Methods and devices for determining the position and/or angular orientation of a rotating shaft. Exemplary features include a sensor module and a position determination module. Sensor module may include a plurality of Hall Effect devices (HEDs) arranged at a specified angular separation to produce a signal in response to rotation of the shaft. Position module may be responsive to sensor module to produce a converted signal, determine an error term, and produce a position estimate. Converted signal may be produced by processing the HED signals into sinusoidal reference signals having offset scale and amplitude scale factors. Error term may be determined by processing the converted signals to produce an estimated position signal. Position estimate may be produced by processing the error term. Refined position measurement may be achieved by iterative elimination of regressive differences between position estimates with minimization of absolute magnitude of error term.

A method and apparatus for limiting the absolute magnitude of an audio signal. The method may include firstly variable-gain reducing the gain of an audio signal, and then secondly variable-gain reducing the gain of the audio signal faster than the first variable-gain reduction, thereby limiting the absolute magnitude of the audio signal to a threshold. The first variable-gain reduction may include variable-gain reducing the gain of the audio signal in a first stage, and the second variable-gain reduction may include variable-gain reducing the gain of the audio signal in a second stage that reduces the gain faster than the first stage. The second variable-gain reduction may include delaying the audio signal, finding a peak among the delayed audio signal, calculating a fast gain from a found peak, and modifying the delayed audio signal with the calculated fast gain.

A method of image/video compression with intra-coding blocks analyzed for sum of absolute magnitudes of AC coefficients of DCT of block to determine whether to approximate the block with 0 AC coefficients, and with inter-coding blocks analyzed for sum of absolute differences of block and predicted block to determine whether to approximate the block with a 0 block.

The invention discloses a spectrum self-correction photometer and a measuring method thereof. The spectrum self-correction photometer comprises a light entrance, an optical spectroscope, a spectrometer and a silicon photovoltaic cell with a color filter, wherein light to be measured is divided into at least two beams by the optical spectroscope according to a set proportion; one part of beams is received by the spectrometer, the other part of beams is received by the silicon photovoltaic cell, and the light to be measured is simultaneously measured by the beams. The spectrum self-correction photometer of the invention can greatly reduce errors brought by the mismatch of the spectrum, has less reliance on the spectrum of the light to be measured, overcomes the problems brought by inconsistent special spectrum power distribution of a light source to be measured, time-varying luminescence, and the like, has relative smaller system measuring error and random error and high measuring repetitiveness and is calibrated by utilizing an absolute spectrum radiometer as a standard source so that the absolute magnitude transmission chain of an optical radiation degree is very short. The spectrum self-correction photometer has higher precision and reliable absolute magnitude value and can be applied to various optical radiation measuring systems for measuring a plurality of important optical radiation parameters.

A system and method are provided for calibrating orthogonal polarity in a multichannel optical transport network (OTN) receiver. The method accepts a composite signal and separates the polarization of the signal into a pair of 2ⁿ-phase shift keying (2ⁿ-PSK) modulated input signals via Ix and Qx optical signal paths, where n≧1. Likewise, a pair of 2^p-PSK modulated input signals are accepted via Iy and Qy optical signal paths where p≧1. Polarization-adjusted I′x, Q′x, I′y, and Q′y signals are generated. An average magnitude is compared to either 2×the absolute magnitude of (I′x and Q′x), or 2×the absolute magnitude of (I′y and Q′y). The average magnitude value can be used that is either 2×(a predetermined peak signal amplitude), or the sum of the absolute magnitudes of (I′x and Q′x) and (I′y and Q′y). The polarization-adjusted I′x, Q′x, I′y, and Q′y signals are modified until the magnitude comparison is about zero.

Systems and methods for detecting targets using pulse-compressed radar signals are disclosed. In one application, relatively small targets that are masked by the time-sidelobes of a larger target's return signal can be detected. The methods include a signal expansion type algorithm that is used to process the pulse-compressed return signal. Specifically, a generalized Fourier expansion expression having a summation of PSF terms is used to expand the pulse-compressed signal. Each term represents a respective target and includes a point spread function and a complex coefficient. The signal expansion procedure can be used to determine a set of optimum complex coefficients, with one coefficient for each range bin. Doppler frequency can be used together with range to optimize the complex coefficients. Next, targets are detected by analyzing each range bin to determine whether the corresponding complex coefficient has an absolute magnitude greater than a pre-determined threshold.

An apparatus and method for providing switched power to an AMOLED is disclosed. During certain time intervals, voltage and/or polarity provided to active devices such as thin film transistors (TFT) driving the AMOLEDs may be changed to reverse polarity or differ in absolute magnitude of voltage. During a subsequent time interval, the changed power may be changed again and/or reverted to an original state. It is emphasized that this abstract is provided to comply with the rules requiring an abstract which will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure. It is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims.

This invention relates to an electronic metal detector having transmit electronics comprising switching electronics arranged and adapted to generate a transmit signal, the transmit electronics comprising at least two power sources, a first power source and a second power source, the transmit electronics being connected to a transmit coil arranged and adapted to transmit an alternating magnetic field, wherein the switching electronics are adapted and arranged to switch a first voltage of the first power source to the transmit coil for at least a first period and also a third period, the switching electronics being adapted and arranged to switch a second voltage of the second power source to the transmit coil for at least a second period. The switching electronics are further adapted and arranged to switch approximately zero volts to the transmit coil for at least a fourth period, the second voltage being opposite in polarity to the first voltage, and an absolute magnitude of the first voltage being at least ten times an absolute magnitude of the second voltage, the said first voltage, second voltage, first period, second period and third period and fourth period being selected so that a transmit coil current increases in a second polarity sense during the second period and changes sign during the second period, and the transmit coil current increases in an opposite polarity sense to the second polarity sense during the first period and also the third period, receive electronics is adapted and arranged to receive and process a receive magnetic field during at least some of the second period and fourth period to produce an indicator output, the indicator output at least indicating the presence of at least some metal targets under the influence of the said alternating magnetic field and indicating at least a characteristic of the metal targets.

The invention discloses an online testing device and method for residual strength modulation of a Y-waveguide modulator. The online testing device comprises a detecting optical path module, a detecting circuit module and a host computer. The working principle of the device is that a light source sends an optical signal to the Y-waveguide modulator, one end of an output branch of the Y-waveguide modulator is connected to a detector, and the optical signal is subjected to photovoltaic conversion through the detector, then passes through the level elevation circuit, a filter circuit and a high-speed A/D conversion chip, is processed by an FPGA (field-programmable gate array) and is finally sent to the host computer through an RS232 serial port for display. With design of the online testing device for residual strength modulation of the Y-waveguide modulator, the absolute magnitude of residual strength modulation can be obtained directly and rapidly, the problems of low precision and low testing speed are solved, one objective real-time online method is provided, and compared with the conventional methods adopting an oscilloscope, a lock-in amplifier, spectral analysis and the like, the testing precision is higher, the speed is higher and the functions are more complete.

In a first embodiment, an ultra-fast breakover diode has a turn on time T_ON that is less than 0.3 microseconds, where the forward breakover voltage is greater than +400 volts and varies less than one percent per ten degrees Celsius change. In a second embodiment, a breakover diode has a reverse breakdown voltage that is greater, in absolute magnitude, than the forward breakover voltage, where the forward breakover voltage is greater than +400 volts. In a third embodiment, a string of series-connected breakover diode dice is provided, along with a resistor string, in a packaged circuit. The packaged circuit acts like a single breakover diode having a large forward breakover voltage and a comparably large reverse breakdown voltage, even though the packaged circuit includes no discrete high voltage reverse breakdown diode. The packaged circuit is usable to supply a triggering current to a thyristor in a voltage protection circuit.

A system and method are provided for calibrating orthogonal polarity in a multichannel optical transport network (OTN) receiver. The method accepts a composite signal and separates the polarization of the signal into a pair of 2ⁿ-phase shift keying (2ⁿ-PSK) modulated input signals via Ix and Qx optical signal paths, where n≧1. Likewise, a pair of 2^p-PSK modulated input signals are accepted via Iy and Qy optical signal paths where p≧1. Polarization-adjusted I′x, Q′x, I′y, and Q′y signals are generated. An average magnitude is compared to either 2×the absolute magnitude of (I′x and Q′x), or 2×the absolute magnitude of (I′y and Q′y). The average magnitude value can be used that is either 2×(a predetermined peak signal amplitude), or the sum of the absolute magnitudes of (I′x and Q′x) and (I′y and Q′y). The polarization-adjusted I′x, Q′x, I′y, and Q′y signals are modified until the magnitude comparison is about zero.

The invention is a kind of ultrasonic deformeter, which is mainly made up of emission piezo-electric, sound insulating material, metal shell, transmitting end power outgoing line, receiving end power outgoing line. It has merits of high accuracy, low cost, no electromagnetism interference, no loose, adjustable strain absolute magnitude, small size. It especially is suitable for long time strain measurement and the rheopectic measurement of construction structure safe monitoring, hill arpon.