33results about How to "Optimize phase" patented technology

The invention discloses a method for compensating delay and frequency response characteristics of multi-output channel sound system and system implementation thereof. The method comprises the following steps that firstly, phase difference between channels of a multi-channel output device is measured, so that the situation that the multi-channel output device itself is in the state of synchronously outputting signals is ensured; then the delay of the signals which are output by the multi-channel output device and pass through a signal processing system, a loudspeaker box and a space transmission routine to reach a specific audition area is estimated through a delay estimation method, and delay compensation is conducted on the channels by comparing delay difference between the channels; finally, an FIR frequency response compensating filter is designed and achieved according to actually detected frequency response curves of a signal transmission routine, and the part above the low and medium frequency in the frequency response curves of the multiple channels is compensated into a straight line through the filter as far as possible. By means of the method, when sound waves transmitted out of each loudspeaker box reach the audition area, the phases of the sound waves are basically the same, and the frequency response characteristics of the channels are basically the same.

The invention discloses a low-intermediate frequency wireless receiver with calibration circuit, which comprises: a high-speed frequency divider with an added differential offset current tunable array to change local oscillator duty ratio by fine tuning offset current and realize coarse tuning for image frequency interference phase, and a frequency mixer with a resistive load tunable array to eliminate amplitude mismatch as image frequency interference and a switch capacity load tunable array to realize fine tuning for image frequency interference phase. This invention improves the mismatch from asymmetry and technology error and suppression function to interference.

The invention provides a method for optimizing an attenuated phase-shifting mask (ATTPSM) of a nonideal photoetching system based on an Abbe vector imaging model. The method comprises the following steps of: setting transmittivity of different phase opening parts in the phase-shifting mask; setting a variable matrix Omega; setting a target function D as linear combination of an imaging evaluationfunction of an ideal image surface and an imaging evaluation function of an image surface of which the defocusing quantity is fnm; and guiding optimization on the pattern and the phase of the phasing-shifting mask by using the variable matrix Omega and the target function D. By using the vector imaging model and taking vector characteristic of an electromagnetic field into consideration during acquisition of a space image, the optimized mask is suitable for the photoetching system with small numerical aperture (NA) and also suitable for the photoetching system of which the NA is more than 0.6. By the method, the gradient information of optimizing the target function is utilized and a steepest descent method is combined to optimize the pattern of the phase-shifting mask, so the optimization efficiency is high.

The invention discloses a magic tee power divider based on a novel matching structure. The magic tee power divider mainly comprises a first output rectangular waveguide, an input rectangular waveguide and a second output waveguide, wherein the input rectangular waveguide and the second output waveguide are connected with the first output rectangular waveguide. The matching structure is arranged in the first output rectangular waveguide, consists of at least two rectangular steps and a metal column and partially extends into the second output rectangular waveguide. The magic tee power divider based on the novel matching structure has the advantages that the magic tee power divider is simple in processing, the matching structure and a magic tee can be processed by milling once, assembly errors in matching result assembly are reduced, the phase position and amplitude balance at an output port are fine, and isolation ports are well isolated.

The invention discloses an ultrasonic energy control circuit for interventional therapy and relates to the technical field of ultrasonic. The control circuit comprises a signal generator, a power amplifier, a matching network, an ultrasonic transducer and a feedback circuit, which are sequentially connected. The feedback circuit is connected with the signal generator. The signal generator is used for generating a sine wave. The power amplifier is used for amplifying the signal of the sine wave. The matching network is used for performing impedance and power matching on the sine wave after signal amplification. The ultrasonic transducer is used for performing electric energy or mechanical energy conversion on the sine wave after impedance and power matching. The feedback circuit is used for detecting the power, frequency and impedance of the ultrasonic transducer, and sending the detected power, frequency and impedance to the signal generator. The ultrasonic energy control circuit is provided with the feedback circuit, thereby realizing stable automatic tracking so as to guarantee stability of ultrasonic energy of an ultrasonic transmitter.

The invention discloses a compact power divider which mainly comprises a first output rectangular waveguide, an input rectangular waveguide which is connected with the first output rectangular waveguide and a second output waveguide, wherein a matching structure is arranged in the first output rectangular waveguide, and partially extends into the input rectangular waveguide, one end of the second output rectangular waveguide, which is far away from the matching structure, is bent around the axis direction of the first output waveguide by 90 degrees, and wave-absorbing materials are arranged at the bending part of the second output rectangular waveguide. The compact power divider has the beneficial effects that the compact power divider is simple to process, the matching structure and a magnetic T can be processed through one milling, so the assembly error during the assembly matching result is reduced, the compact power divider has a compact structure, the phase and amplitude balance of an output port is good, and isolated ports are well isolated from each other.

The invention relates to a driver of an acousto-optic modulator, and aims at solving the technical problem that a present acousto-optic modulator cannot accurately obtain orthogonal signals needed by a demodulation algorithm. The driver comprises a direct digital synthesizer, a controller, a current-to-voltage circuit, an orthogonal analog signal output interface and a pulse modulation circuit, wherein the output end of the controller is connected with the input end of the direct digital synthesizer, one output end of the direct digital synthesizer is connected with the input end of the current-to-voltage circuit, the output end of the current-to-voltage circuit is connected with the orthogonal analog signal output interface, and the other output end of the direct digital synthesizer is connected with the input end of the pulse modulation circuit. The driver can be widely applied to heterodyne type hydrophone systems.

The invention discloses an out-of-focus digital fringe projection calibration device and method. The method comprises the steps of calibrating camera parameters under a system defocusing condition; calibrating projector parameters under the condition that the system is out of focus; and obtaining a more accurate conversion relationship between the phase information and the spatial depth information of the to-be-measured object. The device disclosed by the invention is used for a method for carrying out structured light projection on an object. Absolute phase information of the position of theto-be-measured object is obtained; due to the fact that a commercial projector has a nonlinear effect, projection fringes approximate to standard sine are obtained in a defocusing mode, the key purpose of calibration is to better convert the absolute phase and the object height, the absolute phase is obtained through the device, calibration is also conducted in the device, the measurement precision is improved, and errors of the detection result of the height change area are reduced.

A pattern generator PG generates control data which specifies a threshold voltage to be compared with a signal under test input to an I/O terminal, and generates expected value data which represents an expected value for the comparison result between the signal under test and the threshold voltage. A threshold voltage generator generates the threshold voltage having a voltage level that corresponds to the control data at every setting timing indicated by a first timing signal. A level comparator compares the voltage level of the signal under test with its corresponding threshold voltage. A timing comparator latches the output of the level comparator at a strobe timing indicated by a second timing signal so as to generate a comparison signal. A timing adjustment unit adjusts the phase of the first timing signal.

The invention discloses a power amplifier module applied to a mobile phone antenna end. The power amplifier module comprises a main signal circuit, a main signal bias circuit, an auxiliary signal circuit, an auxiliary signal bias circuit, a power feedback circuit and an output conversion matching circuit. According to the power amplifier module, through utilization of the power feedback circuit, the output power of the auxiliary signal circuit is collected in a dynamic mode, and a sampling voltage is fed back in real time. The bias circuit is adjusted through utilization of the feedback sampling voltage. The problems that in the prior art, the applicable frequency and power ranges of the power amplifier module are very narrow, the compensation effect is greatly influenced by technological parameters, the performance is instable, and moreover, the product repeatability and consistency are difficult to ensure in mass production are solved. The efficiency and the linearity are optimized in the same power range or the same frequency range.

The invention discloses a test-grade cable, comprising an inner conductor (1) and an outer dielectric layer (2), characterized in that: the material of the inner conductor (1) is silver-plated copper, and the material of the dielectric layer (2) is It is PTFE, and the dielectric layer (2) is wound on the inner conductor (1) by wrapping. The beneficial effects of the present invention are: due to the special structure of the present invention, the stability of the amplitude and phase of the cable can be maintained during use, while ensuring that the device under test has high precision and good consistency, and the voltage standing wave ratio VSWR<1.340GHz , the phase change degree of the product PhaseStability<±8.0°40GHz, and the insertion loss change of the component is less than 0.1dB40GHz. Therefore, the present invention not only has good consistency and stability of performance indicators, ultra-low voltage standing wave ratio, but also has excellent phase and amplitude stability.

The present invention discloses a novel 3dB waveguide power divider and belongs to the microwave communication technical field. The 3dB waveguide power divider of the present invention comprises a T-shaped EH surface waveguide cavity, a stepped matching block and matching screws; two T-shaped standard rectangular waveguides are welded together so as to form the T-shaped EH surface waveguide cavity; the stepped matching block is located in the T-shaped EH surface waveguide cavity and includes three steps; and altogether 2 matching screws are adopted and are distributed at the inner wall of the T-shaped EH surface waveguide cavity in a mirror symmetry manner. The novel 3dB waveguide power divider of the invention is simple in structure and convenient to process. The standing waves of the ports of the novel 3dB waveguide power divider in frequency bands from 11.45GHz to 14.5GHz are smaller than 1.15; the phase and amplitude balance of the novel 3dB waveguide power divider are good; and the direction of the phase of the common port of the novel 3dB waveguide power divider is orthogonal to the directions of the electric fields of the two output ports of the novel 3dB waveguide power divider, and the directions of the electric fields of the two output ports of the novel 3dB waveguide power divider are identical. The novel 3dB waveguide power divider is suitable for being adopted as a power distribution or synthesis device of a broadband antenna and can be applied to conditions which have special requirements for the directions of the electric fields of ports.

A device and method for a receiver configured to perform timing recovery decoupled feed-forward equalizer (FFE) adaptation. The receiver device can include an analog front-end (AFE) device, which is coupled to a time-interleaved (TI) interface. The TI interface is coupled in a timing recovery feedback loop to FFE equalizers, a digital signal processor (DSP), a delay timing loop (DTL) device, and a clock device, which feeds back to the TI interface. The DSP has an additional pathway to the FFE equalizers, which has an additional pathway to the DTL device. The DTL loop is equipped with an interleave specific enable/disable vector Q[1:N] that can turn on/off the contribution of the specific time interleave errors to the timing recovery loop, which allows the FFE adaptation process to be decoupled from the timing recovery loop.

The invention belongs to the technical field of wireless networks, and relates to a subcarrier detection and real-time visualization method, system and platform based on WIFI. Through the method and the corresponding system and platform, a mode of visualizing subcarrier information in real time by taking time as an abscissa and a subcarrier as an ordinate can be provided, and amplitudes of a subcarrier at different moments in a certain time period can be presented on the same image; the transformation condition of the subcarriers in the time period can be clearly known by observing the drawn image, and compared with a traditional mode, an observer can directly use naked eyes to carry out primary feature extraction conveniently, and the state of an observation target described by the subcarriers can be visually and accurately obtained. Corresponding subcarrier information between different transmitting antennas and receiving antennas in a certain period of time can be drawn at the same moment, so that real-time phase and amplitude analysis is facilitated, and more accurate target judgment is facilitated; and the scheme of the invention is easy to operate, and the cost required by experimental equipment is lower.

The invention discloses a mineral insulating cable used for a 1E-stage K1 type nuclear measurement system in a nuclear power plant safety shell. The mineral insulating cable comprises a stainless steel sheath and a plurality of conductors arranged in the stainless steel sheath; gaps are formed between the conductors and the stainless steel sheath, and the gaps are filled with an insulating layer;and the conductors comprise a plurality of copper conductors, a nickel-chrome conductor and a nickel-aluminum conductor. The mineral insulating cable is insulating, high-temperature resistant, high instrength and tensile property, and has a wire compensating effect.