117 results about "Amplitude modulation" patented technology

An optical device includes a generator, a light emitter, a modulator, an optical amplifier, a current source, a storage, and a controller. The generator generates an electric signal of a multilevel amplitude modulation method. The light emitter emits laser light. The modulator modulates the laser light using the electric signal and outputs an optical signal. The optical amplifier optically amplifies the modulated optical signal according to a drive current. The current source adjusts the drive current to be supplied to the optical amplifier. The storage previously stores an information with respect to input-output characteristics of the optical signal in the optical amplifier relative to drive current value of the drive current. The controller acquires, from the storage, the input-output characteristics corresponding to the drive current value of the drive current supplied to the optical amplifier and controls the electric signal based on the acquired input-output characteristics.

The application relates to a display device. The pixel circuit in the display device comprises an amplitude modulation module and a pulse width modulation module. The amplitude modulation module comprises a first capacitor, a first coupling control unit, a second coupling control unit and a driving unit. In a data writing stage, the first coupling control unit receives and outputs a preset voltage signal to a first end of the first capacitor; the driving unit receives a PAM data signal and stores the PAM data signal to the first capacitor. In a comparison light emitting stage, the second coupling control unit receives and outputs a first power voltage signal to the first end of the first capacitor, and a voltage difference at the first end of the first capacitor is coupled to the driving unit. Under the action of a first light emitting control signal, the driving unit outputs a driving current signal to a light emitting device based on the voltage difference, the PAM data signal and the first power voltage signal; wherein the second coupling control signal is valid earlier than the first light emitting control signal. The display consistency of the display device is high.

The present application provides a display panel (100) and a display apparatus (200), wherein the display panel (100) includes a pixel circuit (P), the pixel circuit (P) includes an amplitude modulation subcircuit (P2) and a pulse width modulation subcircuit (P1), the display panel (100) also includes a substrate (10), a voltage division signal line (21), and a first constant voltage signal line (31), the voltage division signal line (21) is located at a side of the substrate (10), the voltage division signal line (21) extends along a first direction (X), the first constant voltage signal line (31) is located at the side of the substrate (10), the first constant voltage signal line (31) extends along a second direction (Y) and transmits a high potential voltage to the pulse width modulation subcircuit (P1), and the first direction (X) intersects with the second direction (Y), wherein a plurality of the first constant voltage signal lines (31) are electrically connected to a plurality of the voltage division signal lines (21). In an embodiments of the present application, by adding the voltage division signal line (21) in the display panel (100), and cross-connecting the voltage division signal line (21) with the first constant voltage signal line (31), a mesh structure for transmitting a first power supply voltage is formed, so as to improve the stability of the first power supply voltage, so that the light-emitting element (F) can be turned on and off accurately, thereby improving the display reliability of the display panel (100).

The present disclosure provides a communication radar integrated optical fiber remote system and a phase locking method. A remote antenna unit is configured to receive a reflected microwave signal, and modulate the amplitude of the microwave signal to obtain an initial optical carrier signal. A dispersion compensation unit is connected with the remote antenna unit and configured to perform dispersion compensation on the initial optical carrier signal to obtain an optical carrier signal. A central unit is connected with the dispersion compensation unit and configured to perform phase locking using the received optical carrier signal to obtain an output optical signal. The frequency of the output optical signal is the same as that of the optical carrier signal, and the phase of the output optical signal is the same as that of the optical carrier signal. A signal output unit is connected with the central unit and configured to output the output optical signal. The present disclosure realizes the consistency of the frequency and the phase synchronization of the output optical signal and the optical carrier signal, realizes low phase noise carrier recovery, and improves the communication and radar performance.

FIELD: measuring equipment.SUBSTANCE: invention relates to a device for determining wind parameters. The wind parameter determinator comprises a control and signal processing unit (1), as well as an optical-electronic module (2). The control and signal processing unit (1) includes an analogue-to-digital converter (13) and a module (14) for calculating correlation functions between signals. The optical-electronic module (2) includes three photodetectors (8) with signal amplification units (11), amplitude detection units (12), as well as an optical system (4) with a variable focal length, a diaphragm unit (7), an amplitude modulator (5) of the intensity of the background radiation flux with a reference modulation frequency.EFFECT: increase in the sensitivity of the device.1 cl, 1 dwg

A spatial ultrasound modulator includes a signal line, an ultrasonic array, a pixel coder and an ultrasonic driver. The signal line includes a plurality of first conductive lines and a plurality of second conductive lines. The plurality of first conductive lines are arranged to be spaced apart from each other on a substrate. The plurality of second conductive lines are arranged to intersect the first conductive lines above the plurality of first conductive lines and to be spaced apart from each other. The ultrasonic array includes a plurality of ultrasonic generators. Each of the plurality of ultrasonic generators includes at least one capacitive micromachined ultrasonic transducer (CMUT) device. Each of the plurality of ultrasonic generators is superimposed on one of a plurality of pixels, which are intersection points of the plurality first conductive lines and the plurality of second conductive lines. Each of the plurality of ultrasonic generators generates a unit-ultrasonic wave. The pixel coder may be configured to generate the coding array by coding each of the plurality of pixels of the ultrasonic array so that an operation mode of each of the plurality of pixels may be a contrasting binary operation mode of the ultrasonic generator. The coding array includes active pixels and inactive pixels. The ultrasonic driver drives the coding array to generate amplitude-modulated ultrasonic waves of which a wavefront may be deformed. The amplitude-modulated ultrasonic waves are a synthesized plurality of unit-ultrasonic waves.

The application belongs to the technical field of ocean exploration, and specifically discloses a seabed bottom type in-situ detection device and method. The device comprises an upper computer, a transmitter and a receiver. At the transmitter end, the application modulates selected initial identification information symbols into a low-frequency carrier frequency band in a multi-band linear frequency modulation manner to generate a low-frequency modulated wave, and then modulates the low-frequency modulated wave into a high-frequency carrier in an amplitude modulation manner to form a narrow underwater acoustic beam. At the receiver end, because different types of seabed have different self-demodulation capabilities and underwater sound dissipation characteristics at different bit positions of the identification information symbols, T-BOK demodulation is realized through low-frequency echo reception to obtain a three-state identification code, and the delay information of each bit of the three-state identification code is recorded. Through the three-state identification code demodulated by the low-frequency echo, the delay information of each bit of the three-state identification code, and a three-state identification code codebook generated in advance, the seabed bottom type and distribution characteristic parameters are obtained.

A generator with a regeneration device. The electrosurgical generator according to the invention includes an oscillating circuit excited by means of an excitation circuit having a frequency preferably close to its resonant frequency, wherein the oscillation should be periodically interrupted. This can be done, for example, in situations where a pulse-pause modulation of a radio frequency voltage must be created, the fundamental frequency of which, for example, 350 kHz or 500 kHz, can be modulated with a modulation frequency of, for example, 50 kHz. To stop the oscillation in the generator's oscillating circuit as abruptly as possible without losing the energy stored in the oscillating circuit, a regeneration circuit is provided, implemented by means of a voltage multiplier circuit. Compared to a boost converter coupled inductor, it has the advantage of providing a low capacitive load to the oscillating circuit, especially because it is only electrically effectively connected to the oscillating circuit via a switch during the regeneration phase. This concept allows for efficient energy regeneration and therefore allows for precise amplitude modulation of the radio frequency voltage, particularly square wave modulation (on-off-switch).

A system and method for distortion reduction. In some embodiments, a system for distortion reduction includes a transmitter comprising pulse amplitude modulation driver circuitry. The pulse amplitude modulation driver circuitry may include a main driver comprising a most significant bit (MSB) amplifier and a least significant bit (LSB) amplifier. The LSB amplifiers may include an upper arm and a lower arm, the strength of which is adjustable.

The present application relates to a kind of gravity balance type tamping machine and its working method, the gravity balance type tamping machine includes rack, tamping hammer, hammer lifting driving device, counterweight box, flexible connecting mechanism, lock hammer holder, hammer lifting holder and safety stop device.Gravity balance type tamping machine uses gravity balance type synchronous transmission system, through flexible connecting mechanism, hammer lifting driving device is combined with lock hammer holder, lifting holder and safety stop device organically, realize that driving end is separated from clamping end completely, the synchronous movement error of clamping end and driving end is ≤0.5mm, and working stability is high;Through multi-dimension sensor fusion, amplitude modulation frequency modulation intelligent closed-loop control, realize the accurate control of hammer lifting and drop hammer, ensure that coal cake tamping is uniform, and hammer lifting height and frequency can be adjusted in real time according to coal cake thickness / hardness, flexible, safe and reliable.

Methods and apparatuses for providing a signal sideband signal via one or more switching method or apparatus. Pulse width modulation is utilized and high efficiency of amplification is provided via a switch mode amplifier. DC restoration may provide for improved carrier suppression. Also subtraction of complementary pulse width modulated signals provides for a multiplier circuit or a multiplier function. A nonlinear carrier signal coupled to a pulsewidth modulator provides for improved amplitude modulation linearity and / or reduced sideband distortion.

The application provides a delay-Doppler transmission method, device and equipment based on continuous domain mapping. Continuous amplitude modulation symbols generated by Shannon-Kotelnikov space filling mapping are sequentially filled into a delay-Doppler domain two-dimensional grid in a column priority rule, so that the geometric neighborhood relationship of continuous mapping is maintained in the delay-Doppler domain. The characteristics that each symbol in the domain experiences approximately uniform equivalent channel gain are utilized to avoid the destruction of the continuous mapping structure by double selected fading. Meanwhile, amplitude enhancement pilots are inserted in the grid and a guard band is set, and energy threshold adaptive adjustment based on a mapping scale parameter is combined to realize channel sparsity parameter estimation, so that the channel estimation and equalization process adapt to the continuous amplitude signal characteristics, thereby realizing the organic integration of analog joint source channel coding and orthogonal time-frequency-space modulation without relying on discrete constellation modulation.

This application provides a method for constructing a mainshock and aftershock sequence and a method for assessing damage to an intake tower. The method includes: obtaining an unfavorable mainshock and aftershock sequence based on ground motion data, and a database of near-field measured mainshocks, near-field measured aftershocks, far-field measured mainshocks, and far-field measured aftershocks; constructing multiple input conditions using the data from the databases and performing unified amplitude modulation processing to obtain the target mainshock and target aftershocks; determining the mainshock spectrum value of the target mainshock and the aftershock spectrum value of the target aftershock; determining the sum of squared residuals (SSE) between the mainshock spectrum value and the aftershock spectrum value, and a scaling factor. k ; Combine the sum of squared residuals (SSE) with the scaling factor k The mainshock spectrum and aftershock spectrum values ​​with a difference less than a preset difference threshold are used as matching results, thereby constructing a mainshock and aftershock combination with good spectral consistency; this application uses an improved spectrum matching method to construct a mainshock and aftershock combination with good comparability.

The application belongs to the technical field of sensors and relates to a non-contact piezoelectric cantilever beam electric field sensor, which comprises an insulating packaging base, a laminated piezoelectric driving assembly, an insulating isolation layer and a terminal sensing load assembly. One end of the laminated piezoelectric driving assembly is fixed in the insulating packaging base, and the other end is suspended to form a cantilever beam structure. The laminated piezoelectric assembly is used to drive the cantilever beam structure to generate a high-frequency mechanical carrier wave, and the terminal sensing load assembly is used to perceive a space electric field. After target electric field information amplitude is modulated on the amplitude envelope of the mechanical carrier wave, an output signal carrying the target electric field information is generated. The electric field characteristics can be extracted by demodulating the output signal. The application has simple structure and high sensitivity, can realize double promotion of inertial gain and sensing gain, improves the signal-to-noise ratio of the system, reduces the manufacturing cost and is convenient for realizing large-scale industrial application.

The present invention relates to an antenna comprising a plurality of sources and a beamforming module connected to the sources. Each source comprises a radiating element (110) with a respective principal radiation axis (Xi, Xj), the inclination of which varies within the antenna. The beamforming module is capable of generating and applying an amplitude modulation law to the radiating elements (110) depending on the beam to be formed. The amplitude modulation law includes an amplitude modulation coefficient for each radiating element (110), such that each radiating element (110) emits a signal having a respective amplitude equal to a given amplitude modulated by the corresponding amplitude modulation coefficient, or receives a signal having a respective amplitude, the corresponding amplitude modulation coefficient being applied to the respective amplitude after reception. The invention also relates to an associated method of use.

Described apparatuses and methods are directed to equalization with pulse-amplitude modulation (PAM) signaling. As bus frequencies have increased, the time for correctly transitioning between voltage levels has decreased, which can lead to errors. Symbol decoding reliability can be improved with equalization, like with decision-feedback equalization (DFE). DFE, however, can be expensive for chip area and power usage. Therefore, instead of applying DFE to all voltage level determination paths in a receiver, DFE can be applied to a subset of such determination paths. With PAM4 signaling, for example, a DFE circuit can be coupled between an output and an input of a middle slicer. In some cases, symbol detection reliability can be maintained even with fewer DFE circuits by compressing a middle eye of the PAM4 signal. The other two eyes thus have additional headroom for expansion. Encoding schemes, impedance terminations, or reference voltage levels can be tailored accordingly.

This invention relates to the field of ultrasensitive magnetic measurement technology based on quantum sensing, and in particular to a single-beam zero-magnetic-field dual-axis vector magnetometer and its usage and applications. This invention employs a single probe laser beam to simultaneously perform pumping and detection functions, and innovatively combines the tensor-vector polar moment conversion (AOC) effect, magnetic field modulation, and large-amplitude modulation of the optical frequency. This significantly reduces the resonant linewidth of the magnetometer while suppressing photon shot noise and detector electronic noise, and achieves dual-axis magnetic field measurement in a zero-magnetic environment. In laboratory desktop experiments, a sensitivity of level 10 can be achieved.

The utility model provides a kind of electronic sounding apparatus and radar detection system based on double channel digital frequency modulation, sounding apparatus includes temperature sensor, humidity sensor, baroceptor, measurement conversion unit, transmitter and receiver, data acquisition module is used to receive temperature, humidity and air pressure signal in high altitude, single-chip microcomputer converts sounding signal into square wave signal and is transmitted to transmitter, transmitter sends square wave signal to ground radar, receiver has answering radar inquiry function, receives the answering signal generated by amplitude modulation ranging inquiry pulse sent by ground radar, inquiry pulse modulation is sent to transmitter, and answer pulse is sent back for ground radar reception;The utility model's sounding apparatus avoids the shortcomings of unstable ranging and easy to be disturbed by continuous wave ranging pulse, and cooperates with ground double channel wind finding radar, and the temperature, humidity, pressure, wind speed, wind direction in 30 kilometers from ground to high altitude, square 200 kilometers in air can be accurately detected.

The application relates to the technical field of millimeter wave radar, in particular to a short-distance millimeter wave radar displacement measurement system. A first static echo signal and a dynamic echo signal are collected by a return signal collection module, a second static echo signal is constructed according to the first static echo signal and a direct current offset component in the first static echo signal by a correction parameter calculation module, and an amplitude imbalance parameter and a phase imbalance parameter are obtained according to the second static echo signal, so that high-precision imbalance parameter estimation under an arbitrary amplitude modulation condition is realized. Meanwhile, the dynamic echo signal is corrected according to the amplitude imbalance parameter, the phase imbalance parameter and the direct current offset component by a signal correction module, so that a corrected dynamic echo signal is obtained, the correction accuracy of the dynamic echo signal reflected by the measured object is significantly improved, and a displacement measurement result is obtained according to the corrected dynamic echo signal by a displacement measurement module, so that the accuracy and reliability of the displacement measurement result are further improved.

The application discloses an optical memristor, relates to the fields of photonic integrated circuits and optical computing, and comprises a waveguide layer, a ferroelectric film layer, an electrode structure and a substrate; the ferroelectric film layer is located on the upper surface of the substrate; the waveguide layer and the electrode structure are both located on the upper surface of the ferroelectric film layer; the waveguide layer is used for propagating an incident light signal and performing amplitude modulation on the incident light signal; the electrode structure is used for applying an electric field to the ferroelectric film layer; and the ferroelectric film layer is used for performing phase modulation on the light signal propagating in the waveguide layer under the action of the electric field. The ferroelectric material is used as an optical switch of the optical memristor, high-efficiency modulation of light phase is realized by using the non-volatility and high electro-optic effect of the ferroelectric material, and the optical memristor has the advantages of low energy consumption and fast response.

Method for exchanging a message between a sender and a receiver using a neutrino-based communication channel, comprising the steps of: sender-side encoding of the message into a codeword using deterministic or stochastic post-Shannon coding (PSK), sender-side generation of a neutrino beam by: - ​​accelerating protons in a proton beam, - deflecting the proton beam onto a target to generate neutrinos through the decay of short-lived particles;Transmitter-side amplitude modulation of the neutrino beam by: - ​​Controlling the deflection of the proton beam using a controllable deflection system to direct the proton beam either onto the target or onto an absorber according to the bits of the PSK-encoded message, thereby encoding the PSK-encoded message as neutrino pulses, where: ∘ the absence of a neutrino pulse in a time slot represents a "0" bit and ∘ the emission of a neutrino pulse in a time slot represents a "1" bit or vice versa; transmission of the neutrino pulses from the transmitter to the receiver; synchronization of transmitter and receiver using a time synchronization unit that synchronizes the timing of the generated neutrino pulses with time windows of the receiver system;Receiving the neutrino pulses by a neutrino detector of the receiver, wherein: - decay products, in particular light signals, which are generated by the interaction of the neutrinos with a detector medium are detected and - the detected signals are stored as a bit sequence; decoding the received bit sequence, wherein a comparison is carried out between the expected and the received codeword in order to enable identification of the message.;

Reduced complexity maximum likelihood sequence detectors (rMLSDs) for detecting multi-bit symbols, such as symbols found in pulse amplitude modulation (PAM), quadrature amplitude modulation (QAM), and phase shift keying (PSK) signal constellations with more than two constellation points, are disclosed. One illustrative digital communication receiver includes an initial equalizer that derives an initial sequence of symbol decisions from a filtered received signal, each symbol decision in the initial sequence having a second possible symbol decision, and an rMLSD that derives a final sequence of symbol decisions by evaluating a state metric for only each symbol decision in the initial sequence and its second possible symbol decision.

This invention belongs to the field of motion control technology, specifically relating to a motion modulation method, device, equipment, and storage medium for a dual-mass, four-source, split-type mechanical vibration system. Addressing the limitations of existing technologies in coordinating the control of polishing amplitude, motion trajectory, and energy output, as well as effectively suppressing beat vibration, this invention collects the operating frequencies and vibration displacement data of the upper and lower masses of the dual-mass, four-source, split-type mechanical vibration system. It determines the ratio of the operating frequencies of the upper and lower masses, the beat frequency bandwidth weighting function, and the amplitude modulation degree of the upper mass, calculating the vibration stability index of the upper mass and comparing it with a preset beat vibration significance threshold. When the upper mass vibration stability index exceeds the preset beat vibration significance threshold, the operating frequency of either the upper or lower mass is adjusted to keep the system within a stable vibration range. This invention improves the controllability and processing consistency of the polishing trajectory and energy output, adapting to efficient and stable polishing under various working conditions.

This invention discloses a detection device and method for instantaneous broadband and phase-modulated light source signals, belonging to the field of laser signal processing. The detection device includes a polarization-maintaining transmission fiber, a waveguide-type amplitude modulator, a high-speed photodetector, and a signal frequency detector. The detection device provided by this invention features an all-fiber structure, resulting in efficient and accurate detection. It simplifies the performance requirements for the signal generator and facilitates demodulation of the frequency-interval periodic signal carried by the phase-modulated pulse, exhibiting high overall reliability. Furthermore, it can beat the signals of the two branches simultaneously, reducing the bandwidth requirements of the photodetector and avoiding integration of the time-domain signal. This allows for direct differentiation of whether the injected signal is broadband or single-frequency in a specific time slice using ordinary photodetector methods. The invention also provides a calculation process and judgment criteria for analyzing and identifying light source signals. After obtaining the modulation parameters of the injected light source signal, it can automatically and quickly determine whether the signal is an instantaneous broadband light source signal or a phase-modulated light source signal, achieving automatic analysis and judgment of the signal category throughout the entire process.

A method for wireless communication at a user equipment (UE) includes receiving, from a network node, a first message querying a capability of the UE to support a modified high order quadrature amplitude modulation (QAM) scheme associated with a first constellation having a first group of regions, each region of the first constellation comprising a respective second constellation associated with a low order QAM scheme. The method further includes receiving, from the network node, a transmission in accordance with the modified high order QAM scheme based on the UE indicating the capability of the UE to support the modified high order QAM scheme. The transmission conveying a group of symbols, each symbol indicating a first set of bits indicating a first region of the first group of regions, and a second set of encoded bits indicating a constellation point in a respective second constellation comprised in the first region.

This invention relates to a CuNiSn alloy with amplitude-modulated decomposition based on copper (Cu), nickel (Ni), and tin (Sn), the alloy comprising, by weight percentage: nickel (Ni), 4.0% to 20.0%; tin (Sn), 2.0% to 10%; manganese (Mn), 0.1% to 0.3%; niobium (Nb), 0.04% to 0.09%; titanium (Ti), 0.002% to 0.07%; oxygen (O), 0.0010% to 0.0100%; the balance being copper, and unavoidable impurities in a proportion of less than 0.5%, the alloy also containing oxides of Ti and Nb with a size of 50 to 1000 nm in its metallic matrix.

An apparatus may include a transmitter and one or more processors configured to identify a code rate of a low-density parity-check (LDPC) code, receive, by an LDPC encoder, a set of information bits and encode, using the code rate, the set of information bits to generate a set of encoded bits and a set of parity bits, generate, from the set of encoded bits, a matrix of bit arrays, discard one or more parity bits from the set of parity bits to generate a parity bit array with a size equal to a number of column of the matrix, generate a bit array by concatenating (1) one or more bit arrays selected from the matrix of bit arrays and (2) one or more bits selected from the parity bit array corresponding to the one or more bit arrays, and modulate, by a modulator, the bit array to generate modulated data.

The application relates to the technical field of radar electronic countermeasure, and discloses a radar jamming device and method based on a polarization dimension. The device comprises a quadrature dual-polarized antenna unit, a microwave unit comprising a digital control attenuator, a signal generation unit comprising a digital module and a master control module, and a power amplifier unit. The application adopts an amplitude-phase independent decoupling modulation architecture: in the detection stage, the polarization state of the input signal is judged by measuring the instantaneous amplitude-phase characteristics of the H-path and V-path components after frequency conversion, and using a multi-point summation average and variance threshold limiting algorithm; in the synthesis stage, the digital module internally performs digital phase modulation, and synchronously outputs a control code to adjust the digital control attenuator of the microwave link to perform hardware amplitude modulation, so that an arbitrary polarized signal is finally synthesized in space. The application realizes accurate countermeasures against the polarization dimension of the radar, can effectively cope with sidelobe cancellation and other anti-jamming mechanisms, and has the advantages of high integration, strong flexibility, high recognition accuracy and the like.