245 results about "Phase reversal" patented technology

A method and apparatus of transmitting a modulated data over a digital voice network that includes voice compression. The method and apparatus determine whether a voice signal to be transmitted over the network includes a modulated data signal and then encodes or demodulates the modulated data signal and bypasses voice compression when a modulated data signal is detected. The method and apparatus may detect a modulated data signal by detecting the presence of an answer tone and then searching for a plurality of phase reversals having a particular time distance from each other in the voice signal. Once the encoded or demodulated signal is transmitted over the digital voice network, the method and apparatus of the present invention may detect whether the received signal is an encoded data signal or a demodulated data signal. Then the coded data signal may be decoded back into a modulated data signal. Likewise, the demodulated data signal may be modulated back into a modulated data signal. In one embodiment, the invention encodes voice signals including modulated data signals by linearly quantizing the voice signals.

The invention discloses a shifting register, a grid driver and a display device and relates to the technical field of display. The shifting register comprises an upward-pulling module, a downward-pulling module and a control module, wherein the control module further comprises an upward-pulling control unit, a first downward-pulling control unit, a second downward-pulling control unit, a phase reversal unit and a reset control unit; and the upward-pulling module and the downward-pulling module transmit turn-off signals when signals input at a second clock signal input end by the first downward-pulling control unit and the second downward-pulling control unit are respectively high level and low level. The shifting register, the grid driver and the display device can effectively reduce the condenser coupling effect between a grid of an upward-pulling thin film transistor (TFT) and a leak and grid over bias voltage of a downward-pulling TFT, and further stability of the shifting register is effectively improved.

The invention provides a multi-level inverter and a power supply system, and relates to the electronic field. The multi-level inverter and the power supply system can simplify circuit structures. The multi-level inverter comprises two N-level inversion units, a direct-current power source module, a transformer and a filter. Pulse width modulation waves of the two N-level inversion units are staggered by 180-degree phase positions, and the N is an integer larger than or equal to three. The output end of the direct-current power source module is respectively connected with the input ends of the two N-level inversion units, the transformer comprises an original edge and an auxiliary edge, an inductor of the original edge and an inductor of the auxiliary edge are mutually coupled, one end of the inductor of the original edge and one end of the inductor of the auxiliary edge are connected with the output ends of the two N-level inversion units respectively, and therefore the two N-level inversion units are coupled in a phase reversal mode. The other end of the inductor of the original edge and the other end of the inductor of the auxiliary edge are mutually connected, W levels are output at the connecting positions of the inductors, and the W is equal to 2N-1. One end of the filter is connected with the connecting positions of the two coupled inductors, and the other end of the filter is connected with the ground. The multi-level inverter and the power supply system are used for converting the direct current into the alternating current.

The invention relates to a method for quickly detecting capacitance change, which comprises the following steps of: utilizing a detecting circuit to quickly charge a detected capacitor (2) and a filter capacitor (1) at the beginning, thereby establishing a capacitor initial voltage based on a reference voltage Vref; utilizing a current source (6) to charge the filter capacitor (1) while utilizing a switch capacitance circuit to discharge, wherein the switch capacitance circuit is formed by the detected capacitor (2), a switch (3) and a switch (4); after the voltage on the filter capacitor (1) reaches a stable value after a period of time, utilizing a phase-reversal switch capacitance amplifier (9) to amplify a difference value between the voltage of the filter capacitor (1) and the reference voltage Vref; and utilizing an analog-to-digital converter (10) to acquire an output voltage value of the amplifier. When the detected capacitor (1) changes, the voltage on the filter capacitor (1) also changes, and the results acquired by the ADC (analog-to-digital converter) are different. By analyzing the result change of the ADC, the instant relative change of the detected capacitor (1) can be acquired.

A microphone includes an annular gap between the inner cylindrical housing and the outer tubular shell such that the undesired acoustical signals entering the microphone from the side and rear flow into and through the annular gap. The signals are ported through a phase reversal entrance circumferentially surrounding a magnet assembly and impact the diaphragm such that the undesired acoustical signals entering the front of the microphone are substantially cancelled out by undesired acoustical signals originating from the side and rear.

The invention belongs to the technical field of detection, and particularly relates to a method for manifesting latent fingerprints. The invention provides the method for manifesting the latent fingerprints. A magnetic brush is used to attract magnetic powder; the powder forms a 'magnetic powder ear' under the action of magnetic force; and the latent fingerprints on the surfaces of A4 paper, sheet glass, plastic bottles, pop-top cans, sheet copper, aluminum foils, tables or experiment tables can be manifested by using the tip of the powder ear to slightly brush various object surfaces printed with the latent fingerprints. The method is based on magnetic ferroferric oxide nano-powder and utilizes an phase reversal microemulsion polymerization method to prepare fluorescent magnetic silica gel spheres; and the method jointly coats magnetic granular ferroferric oxide and dye molecules in silicon dioxide microspheres by utilizing the hydrolysis of TEOS under alkaline conditions to perform one-step synthesis of magnetic silica monodisperse gel spheres and dye-doped magnetic fluorescent silica gel spheres to obtain magnetic fluorescent multi-functional powder, can be applied to more conditions and ranges, and has simple operation and no toxic or side effect.

This invention relates to weak signal test technology, specifically it is a kind of difference capacitance sensor test circuit. It solves the problem that the test precision of the exist difference capacitance sensor test circuit is not high, includes the full wave rectifying circuit, the said full wave rectifying circuit includes the integrated amplification circuit U1B and dynatron Q1, the phase reversal end of the integrated amplification U1B links with the output end out2 of the summator by the resistance R21, the in-phase end links with the output end out2 of the summator by the resistance R19,R20, the resistance R22 is set between the phase reversal end and the output end, the connection node of the resistance R19,R20 connects the collector electrode of the dynatron Q1, the base electrode of the dynatron Q1 links with the output end out1 of the waveform generator by the resistance R17, R18, the connection node of the resistance R17, R18 earth by the diode D3. The structure of the invention is in reason, the test precision of the weak signal produced by the difference capacitance sensor, the reliability is high.

A low cost, reliable and accurate audio frequency phase detection system and method includes an audio signal source generating an audio frequency test signal and a phase detector detecting phase reversals in the audio frequency test signal. The signal source may be an active, real time signal generator or a recorded media player playing back a prerecorded signal. The test signal is provided to a user system while the phase detector determines whether or not a phase reversal has occurred in the test signal between the input and output of the user system and illuminates a green or red LED to indicate whether or not a phase reversal has occurred. The test signal includes a lower frequency signal component and a higher frequency signal component that provides a marker for testing the phase of the lower frequency signal component.

Disclosed are multiphase oscillators comprising a plurality of delay stages serially coupled in a loop by a plurality of nodes, with the loop being folded to provide two concentric rings of delay stages with equal numbers of allocated nodes. A second plurality of negative-resistance elements are provided, each element having a first output coupled to a node on the first concentric ring and a second output coupled to a node on the second concentric ring. Each such output switches between first and second voltage levels, and provides a negative resistance to a signal coupled to it during at least a portion of the transition between voltage levels. The outputs of an element switch to opposite voltage levels. With this construction, a high-voltage pulse propagates around the loop of delay stages, with a low-voltage pulse propagating behind it. Also disclosed are circuits to control the direction of pulse propagation.

There is provided system, device and method for use by a first gateway device to enable communication between a first modem and a second modem, the first gateway device being capable of communicating with the first modem over a first communication line, the first gateway device being capable of communicating with a second gateway device over a packet network, the second gateway device being capable of communicating with the second modem over a second communication line. An example method comprises receiving a call request for the first modem from the second gateway device, placing a call to the first modem, detecting an answer tone transmitted from the first modem over the first communication line in response to the call, detecting a phase reversal in the answer tone, and transmitting a message indicative of the phase reversal to the second gateway device over the packet network.

GPS reception on helicopters and ground vehicles may be subject to varying near-ground interference. A compact antenna includes vertically spaced arrays of radiating elements. The first array provides a basic reception pattern. The second array provides a pattern having a distinctive low elevation angle phase reversal. By combining signals for these patterns an antenna pattern with a low angle onmidirectional elevation null characteristic is provided to suppress near-ground interference. Prior to combining, signals from the second array may be modified in amplitude or phase, or both, on a semi-permanent basis, or may be adaptively modified on an active basis, in order to adjust the null characteristic. Antennas and methods are described.

The invention discloses a spurious emission interference suppressing method, which can be used for suppressing a spurious emission interference signal of an electronic device. The method comprises the following steps: first of all, modulating an amplitude of a baseband signal to obtain a first modulation signal; then, carrying out down-conversion processing on the first modulation signal to obtain a mixed signal comprising the baseband signal and the spurious emission interference signal; after that, filtering the baseband signal in the mixed signal to obtain the spurious emission interference signal; then, carrying out phase reversal processing on the spurious emission interference signal to obtain a phase reversal spurious emission interference signal; then, carrying out up-conversion processing on the phase reversal spurious emission interference signal to obtain a second modulation signal; and at last, combining the second modulation signal and the first modulation signal to enable the spurious emission interference signal to offset the phase reversal spurious emission interference signal. By adopting the spurious emission interference suppressing method or the spurious emission interference suppressing device disclosed by the embodiment of the invention, spurious emission interference elements in the modulation signals can be effectively suppressed, thereby improving the quality of the modulation signals. And the invention further discloses the spurious emission interference suppressing device and the electronic device.

The invention relates to a bacteriostasic water epoxy resin paint and a method to prepare such paint. The paint consists of water epoxy dope and water-soluble nano Ag. In terms of the preparation process, (1) epoxy resin and polyethylene glycol are heated for reaction under the action of catalyst to achieve water epoxy resin emulsion; (2) epoxy resin and cosolvent are added into the water epoxy resin emulsion to achieve epoxy resin emulsion; (3) water is added into the epoxy resin emulsion, and water epoxy resin emulsion is achieved by phase-reversal technology; (4) water-soluble nano Ag is added into the water epoxy resin emulsion to achieve bacteriostasic water epoxy resin paint; (5) or the paint is evenly mixed with ethylenediamine and triethylene tetramine pro rata and then solidified. The method is simple and easy to implement; the epoxy resin paint has sound water solubility, and the nano Ag wherein has sound dispersibility; besides, a little Ag can be added to achieve better bacteriostasic effect.

A method is provided for controlling when a transponder replies to Mode-S interrogation signals. The method includes receiving Mode-S signals containing P5 and P6 pulses. The received P5 and P6 pulses have certain amplitudes. Each P6 pulse contains a sync phase reversal (SPR) signal followed by a data segment containing Mode-S data The P5 pulse is asynchronous with respect to the P6 pulse and the P5 pulse is timed to overlay the SPR signal. The method further includes, analyzing each P5 and corresponding P6 pulse, and identifying the SPR signal correctly in at least 99% of the received Mode-S signals in which the amplitude of the P6 pulse is at least 12 dB greater than the amplitude of the P5 pulse and in no more than 2% of the received Mode-S signals in which the amplitude of the P6 pulse is at least 3 dB less than the amplitude of the P5 pulse, and replying to the Mode-S signals for which the SPR signal is correctly identified.

A multi-channel optical frequency mixer for all-optical signal processing and a method for engineering the same. The multi-channel mixer uses a nonlinear optical material exhibiting an effective nonlinearity deff whose spatial distribution is defined by a quasi-phase-matching grating, e.g., a QPM grating. The spatial distribution is defined such that its Fourier transform to the spatial frequency domain defines at least two wavelength channels which are quasi-phase-matched for performing optical frequency mixing. The wavelength channels correspond to dominant Fourier components and the Fourier transform is appropriately adjusted using grating parameters such as grating periods, phase reversal sequences and duty cycles to include an odd or even number of dominant Fourier components. The multi-channel mixer can perform frequency mixing operations such as second harmonic generation (SHG), difference frequency generation (DFG), sum frequency generation (SFG), and parametric amplification.

The invention provides an ultraviolet crosslinking polyaryletherketone porous membrane, a preparation method and an application of the ultraviolet crosslinking polyaryletherketone porous membrane in a lithium ion battery separator material and belongs to the technical field of polymer membrane materials. The membrane has the characteristics of high porosity, good infiltration performance, excellent heat resistance and the like. According to the technical scheme, the preparation method comprises steps as follows: firstly, a patented soluble ultraviolet crosslinking polyaryletherketone polymer (the patent No. 201510991547.7) with excellent comprehensive performance is adopted, and an ultraviolet crosslinking polyaryletherketone microporous membrane with high porosity is prepared with a phase separation method and an auxiliary phase reversal method; then, the electrolyte resistance, the stability of thermal dimension, the chemical stability and the mechanical performance of the microporous membrane are further improved with an ultraviolet crosslinking curing technique on the basis that the pore structure and the membrane thickness are maintained. The material has a great significance in improvement of the high safety of a lithium ion battery and has wide application prospect.

A data signal phase reversal correction method and system implementing the same are disclosed. In the present invention, a pilot signal of a satellite is checked to see if there is a phase reversal according to an accumulation of correction results of symbols of the received pilot signal with corresponding symbols of a known pilot sequence. It is determined whether a phase correction of a data signal of the satellite is to be executed or not by referencing the phase reversal determination result of the pilot signal.

A Mode-S transponder is provided for detecting synchronization phase reversal (SPR) signals. The transponder includes a receiver for receiving a Mode-S signal that contains a P6 pulse having a Mode-S data segment and an SPR signal therein. The transponder also includes a phase detector that detects a phase change between first and second states in the received Mode-S signal. The phase detector includes an SPR qualifier that determine whether, following a state change, the Mode-S signal remains at one of the first and second states for at least a predetermined minimum time sufficient to qualify as a detector enable signal.

The invention discloses a water-borne phenolic epoxy resin emulsion and a preparation method thereof. The raw material formula of the water-borne phenolic epoxy resin emulsion is as follows in percentage by weight: 20-50% of phenolic epoxy resin, 2-12% of modifier, 3-50% of organic solvent, 20-50% of distilled water, 2-5% of neutralizer and 1-5% of surfactant. The preparation method is implemented as follows: adding the phenolic epoxy resin in an organic cosolvent, heating and dissolving, dropwise adding the modifier, reacting for 2-60h to obtain a modified phenolic epoxy resin, cooling to 30-60 DEG C, adding the surfactant for assisting emulsification, adopting the neutralizer to neutralize the obtained modified phenolic epoxy resin to have the pH value of 6-7, and adding the distilled water for realizing phase reversal under the stirring condition to obtain the water-borne phenolic epoxy resin emulsion. By the above technical scheme, the invention can provide the water-borne phenolic epoxy resin emulsion with good paint film property and low production cost, which can be used as a basic raw material of an environment-friendly material.

The embodiment of the invention provides a control circuit, a method and a converter for synchronous rectification. The synchronous rectification control circuit comprises a first sampling unit, a second sampling unit and a driving unit, wherein the input end of the first sampling unit is connected with a drain electrode of a synchronous rectifying tube in the synchronous rectification circuit of the converter; the second sampling unit is connected with the synchronous rectification circuit; the first input end of the driving unit is connected with the output end of the first sampling unit, the second input end of the driving unit is connected with the output end of the second sampling unit, the output end of the driving unit is connected to the grid electrode of the synchronous rectifying tube, the first sampling unit is used for acquiring a voltage signal of the drain electrode and carrying out phase reversal so as to output a first control signal, the second sampling unit is used for acquiring a current signal of the synchronous rectification circuit so as to generate a second control signal for switching off the synchronous rectifying tube, and the driving unit is used for AND operation of the first control signal and the second signal so as to generate a driving signal which is used for controlling the synchronous rectifying tube, so that the design of the synchronous rectification control circuit is simplified and the cost is reduced.

A method for inhibiting zero drift of an all-fiber interferometric fiber optic gyroscope and a corresponding all-fiber interferometric fiber optic gyroscope are disclosed. The method comprises: reversing the polarity of an AC voltage applied to a PZT piezoelectric ceramic phase modulator according to a predetermined half-cycle time period, and making half of the difference between output rotation rates of the gyroscope in two adjacent half-cycle time periods as the output rotation rate of the gyroscope in a cycle. A phase reversal switch and a DSP chip are added to the all-fiber interferometric fiber optic gyroscope. The phase reversal switch is used for controlling the polarity of the AC voltage, and the DSP chip is used for outputting a square wave signal to control the phase reversal switch and for calculating the output rotation rate of the gyroscope according to the output signal of a demodulation / amplifier circuit.

The invention discloses a novel silencer and a noise reduction method. The device is characterized by comprising a microphone, a loudspeaker, a separation processor or module and an phase reversal and amplitude modulation processor or module; and the microphone extracts a reference sound signal from the received jumbly sound by the separation processor or module, the reference sound signal is transmitted to the loudspeaker after phase reversal and amplitude modulation are carried out on the reference sound signal by the phase reversal and amplitude modulation processor or module and is output by the loudspeaker, and the specific site noise is counteracted. The method is characterized by comprising the following steps of: receiving the jumbly sound by using the microphone; separating the jumbly sound and extracting the reference sound signal; and after carrying out phase reversal and amplitude modulation on the reference sound signal, outputting the reference sound signal by the loudspeaker to counteract the specific site noise. The invention can realize selective elimination of the background noise without an additional special electromechanical or optical sensing device.

The present invention provides a display panel and a gate driver thereof. The gate driver comprises a plurality of cascading driving stages which are used for sequentially outputting a plurality of gate driving signals, and each driving stage includes a mobile deposit unit, a control unit and a buffer unit. The mobile deposit unit is used for generating a shifting signal. The control unit receives a power source signal, used for performing single-pass reversal processing on the shifting signal, and used for outputting the shifting signal after phase reversal at a normal operating state and outputting a high level voltage signal according the power source signal at an off-position state. The buffer unit is used for reception and buffer output of the shifting signal after the phase reversal or the high level voltage signal, so as to serve as one of the gate driving signals.

The invention discloses an ultrasonic wave head wave phase reversal testing method for the depth of a shallow fracture in the surface of concrete. The method includes the following steps that (1), floating dust and dirt on the surface of a measured object are removed, whether water or steel bars or other foreign bodies exist in the fracture or not is observed, and it is guaranteed that the measured object is dry; (2), ultrasonic wave measuring points are symmetrically arranged in pairs with the measured fracture serving as the center, the measuring points are numbered in pairs, and each measuring distance is the distance between the inner edges of each pair of transducers; (3), ultrasonic wave measuring points are arranged on one side of the measured facture in pairs, the measuring points are numbered in pairs, and each measuring distance is the distance between the inner edges of each pair of transducers; (4), sound and time measurement without fracture crossing is conducted; (5), sound and time measurement with fracture crossing is conducted; (6), in the measurement with fracture crossing, when head wave phase reversal is found in a certain measuring distance, the depth value of the fracture is calculated through measured values of the measuring distance and two adjacent measuring distances. By means of the ultrasonic wave head wave phase reversal testing method, whether ultrasonic waves diffract to the bottom of the fracture or not is judged by observing the head wave phase change, and then the depth of the shallow fracture in the surface of the concrete is accurately detected.

A double workpiece stage rotary exchange device based on synchronous gear direction adjustment belongs to semiconductor manufacturing equipment; the device comprises a rotary stage-exchange device composed of a rotating motor stator, a rotating motor mover, a rotary stage-exchange gear, and a rotating connecting member; a workpiece stage rotating ring sleeve and a workpiece stage gear are disposed at the waist part of a workpiece stage; a workpiece connecting device is disposed at the side surface; after the rotary stage-exchange device is docked with the workpiece connecting device, the workpiece stage is driven to rotate around a base stage center so as to realize position exchange; during the three-beat rotary stage exchange process of the invention, the workpiece stage does not spin, which solves the problems of workpiece stage phase reversal, cable winding, and laser interferometer object loss in current rotary stage exchange modes; meanwhile the invention adopts a stage exchange mode in which the workpiece stage rotates around a base stage center, which avoids the rotation of the whole base stage, provides less rotary inertia and shorter stage exchange time under a condition with a same torque, and increases the operation efficiency of the workpiece stage and the yield of a lithography machine.

The invention discloses an exciting circuit of a flux gate sensor, which is characterized in that a method of integration, differential and addition is adopted to switch a square signal into a triangular wave current signal with a sharp pulse at the peak value point in order to serve as an exciting signal of a flux gate. The exciting circuit has two forms, wherein, one form is composed of an integrator, a differentiator and a summator, and the other form is composed of an operational amplifier, two resistors and two capacitors. A differential circuit in the first form comprises three forms of an in-phase differentiator, a phase inverter plus a phase reversal differentiator and a phase reversal differentiator plus a phase reversal amplifier. The exciting circuit can be used for generating the exciting signal of the flux gate sensor and lower the remanence error of the flux gate under the condition of low power consumption; moreover, the exciting circuit does not need to work at tuning state. The invention has the beneficial effects that the remanence error can reach 0.5nT and the power consumption is 42mW after the exciting circuit is shocked by a magnetic-field strength of 10mT.

The invention discloses a digital leakage current detection circuit and a detection method thereof. The circuit comprises a leakage detection transformer and a detection control circuit connected with the leakage detection inductor, a detection signal reverse connection circuit is arranged on a connection loop of the leakage detection transformer and the detection control circuit, the detection control circuit consists of a singlechip with a built-in analog comparator, and excitation sources are connected on a loop between the signal reverse connection circuit and the detection control circuit in series. Constant excitation voltage is applied on the magnetic ring of the leakage detection transformer in a cyclic and opposite mode in the detection signal reserve connection circuit; sampling digital wave forms are adopted to calculate the magnitude and plus-minus of time difference when phase reversal reaches magnetic saturation twice, which also reflect the current size and direction ofa detected object; and measurement on the leakage current Ix can be realized based on Ix=k*delta t.

The invention discloses a color film substrate, a display panel and a display device. The color film substrate comprises a base substrate, a colored filter layer and a phase reversal pattern, wherein the colored filter layer and the phase reversal pattern are arranged on the base substrate, the phase reversal pattern comprises multiple openings, the multiple openings correspond to multiple filter units of the colored filter layer, and the phase reversal pattern is used for defining the boundary of each filter unit; the projection of the phase reversal pattern on the base substrate is at least partially covered on the projection of an area between adjacent filter units on the base substrate; and the phase reversal pattern is configured for enabling light passing through the phase reversal pattern to generate phase reversal. The color film substrate can replace or partly replace a black matrix by forming the phase reversal pattern on the base substrate, and due to the adoption of the color film substrate, the generation of light leak caused by bending, of the display panel, can be prevented.

The invention relates to a protection device and a method for anti-phase / open-phase of a three-phase compressor, so as to solve the non-detection problem when the three-phase of the power supply of the compressor is reversely or erroneously grounded. The device comprises a three-phase compressor feed circuit, a three-phase voltage detection circuit, an anti-phase / open-phase detection circuit, a protection execution circuit, and a power supply circuit. The three-phase voltage detection circuit is composed of a diode rectification circuit bridged over the three-phase line and the ground and an optical coupling transistor circuit bridged over the two ends of the diode; the anti-phase / open-phase detection circuit is composed of a microprocessor input pin connected with the three output terminals of the three-phase voltage detection circuit, a triode relay circuit with the grid thereof connected with the output pin of the microprocessor, an anti-phase / open-phase sound alarm circuit and the power supply circuit; the protection execution circuit is composed of a contactor with the contact point connected with the feed circuit of the three-phase compressor in series and the damping coil thereof controlled by the contact point of the triode relay; and the power supply circuit is composed of the two-phase bridge type rectified, CR and filter circuit after being stepped down by the transformer in the three-phase power supply.