100results about How to "Anti-aliasing" patented technology

The invention discloses a polyphase permanent magnet synchronous motor current waveform optimal control method, comprising the following steps of A, current reference value coordinate transformation; B, current multiple proportion resonance regulation; and C, coupling compensation. In the control method, based on polyphase permanent magnet synchronous motor vector control, a polyphase synchronous rotating coordinate system current reference value is transformed to a current reference value of each phase in a polyphase static coordinate system through polyphase coordinate transformation, the current reference value of each phase and a current feedback value of each phase of a motor are respectively subjected to improved multiple superposition proportion resonance regulation, and a resonance separation method is introduced, decoupling is realized by feed-forward compensation, and floating tracking and harmful subharmonic restraining for highly dynamic property fundamental waves and usable subharmonic are realized. The method can restrain the adverse impacts, such as motor loss, torque ripple and vibration noise, caused by a harmful harmonic current of the polyphase motor, can explore the positive effects of the usable harmonic current, gives full play to the advantages of the polyphase motor and improves the system performance.

The invention relates to an electromagnetic prospecting sending-receiving integration method and a device. The invention is suitable for the fields of geophysical prospecting, engineering geological prospecting, underground military target detection, nondestructive inspection and the like. The technical scheme of the invention is as follows: arranging an inner receiving coil 1 in a sending coil 3; arranging an outer receiving coil 2 outside the sending coil 3; ensuring that magnetic flux passing through the inner receiving coil 1 and the outer receiving coil 2 is equivalent and is in opposite sign under the action of primary field; mutually offsetting primary field induced voltage; and only outputting a secondary field signal. The device comprises a transmitter 4, a sending coil 3, an inner receiving coil 1, an outer receiving coil 2, a signal conditioning circuit 5 and a receiver 6, wherein the inner receiving coil 1 is connected with the outer receiving coil 2, and the coil 1 and the coil 2 are connected with the signal conditioning circuit 5. The invention has the advantages of eliminating primary field influence, reducing signal dynamic range, expanding the practicability of small-wireframe same-point device and realizing integration of the sending coil and the receiving coil.

The invention belongs to the technical field of digital signal processing such as seismic exploration data processing and electronic signal processing, and particularly relates to a method for performing two-dimensional filtering to a digital signal. The method comprises the following steps: collecting data gathers of the digital seismic signal; performing Hilbert transformation to the data gathers of the digital seismic signal to obtain cosine phase function gathers and instantaneous envelope gathers of the digital seismic signal; conducting the two-dimensional filtering on the cosine phase function gathers; performing corresponding multiplication to the cosine phase function gathers after two-dimensional filtering and the instantaneous envelope gathers; and outputting the data gathers of the digital seismic signal after the noise, the interfering signal as well as the aliasing phenomenon are eliminated, so as to achieve the purpose of fidelity processing of the digital seismic signal.

The invention presents a speech processing method and device. The method includes the following steps: collecting N current speech frames; carrying out sub-band decomposition on each current speech frame to acquire M sub-band signals of each current speech frame, wherein N and M are positive integers; extracting sub-band signals of the same band from the M sub-band signals of each current speech frame; for each band, carrying out beam-forming on the N sub-band signals under the band to get a first speech signal; and carrying out sub-band synthesis on the first speech signals under the bands toacquire an output signal of the current speech frames. According to the method, sub-band decomposition is carried out on each speech frame collected, beam-forming is carried out on the sub-band signals under the same band, and an output signal is obtained through sub-band synthesis. The aliasing in the output signal can be eliminated. Moreover, the signal-to-noise ratio of the output signal is improved, a speech signal with high quality can be output, and the accuracy of speech localization can be improved.

The disclosure provides a display apparatus, and an image data processing apparatus and method. The image data processing apparatus comprises an edge detection module used for receiving to-be-displayed image data arranged in a delta manner and performing edge detection on the to-be-displayed image data to obtain edge sub-pixel points; a brightness comparison module used for comparing the brightness of each obtained edge sub-pixel point with the preset brightness; a brightness attenuation module used for performing brightness attenuation on the edge sub-pixel points whose brightness exceeds the preset brightness to obtain to-be-transmitted image data; and a data transmission module used for transmitting the to-be-transmitted image data to a source driver. According to the display apparatus and the image data processing apparatus and method, edge sawteeth can be well eliminated, and the sharpness of image edge display can be maintained.

The invention relates to a polyphase induction motor appointed secondary current waveform control method, comprising the following steps of A, current feedback value processing; B, current complex regulation; and C, voltage reference value determination. In the method, based on polyphase induction motor vector control, a polyphase motor current is mapped to a synchronous rotating coordinate system of mutually orthogonal fundamental waves and each usable subharmonic through polyphase synchronous rotating coordinate transformation, proportion integration resonance regulation and proportion integration regulation are respectively executed, and a complete current controller is formed by superposition; integration and resonance separation are respectively introduced so as to further improve the static and dynamic performances. The method has the advantages that the method is realized by digital control, and is simple and practical; the method can restrain the adverse impacts, such as motor loss, torque ripple and vibration noise, caused by a harmful harmonic current of the polyphase induction motor, can explore the positive effects of the usable harmonic, and gives full play to the advantages of the polyphase motor. The method can be used in the high-power alternating current motor driving occasions, such as marine propulsion, mining machinery and track hauling.

The invention discloses a video super-resolution reconstruction method based on adaptive interpolation kernel learning, comprising obtaining the interpolation kernel dictionary of a high resolution image block and a corresponding dual matrix according to a video image training set, wherein the video image training set comprises high and low resolution image blocks; obtaining the interpolation kernel of an image block structure corresponding to each atom in the interpolation kernel dictionary of a high resolution image block according to the interpolation kernel dictionary of the high resolution image block; and constructing the interpolation kernel of image small blocks of an image to be processed, and utilizing the interpolation kernel of image small blocks of the image to be processed to amplify the interpolation of the image to be processed according to the dual matrix and the interpolation kernel of an image block structure corresponding to each atom. The method at least partially better maintains edge and texture information in a video image, and effectively reduces distortion interference of aliasing, sawtooth, ringing, etc.

The invention provides a wireless data transmission terminal. A digital intermediate frequency structure of the wireless data transmission terminal is used for under-sampling processing of intermediate frequency signals, then a complex band-pass filter is used for completing aliasing cancellation and out-of-band rejection, and finally decimation filtering and frequency mixing are carried out. The invention further provides a digital intermediate frequency processing method. The wireless data transmission terminal and the digital intermediate frequency processing method are capable of achieving intermediate frequency signal sampling in the condition of low cost and low power consumption.

The invention discloses a line-staggered and tessellated rendering method for a three-dimensional video, comprising the steps of storing left view and right view of an image of each frame of the three-dimensional video in a first storage space; carrying out smooth scaling on the left view and the right view in the first storage space, and storing the left view and the right view in a second storage space and a third storage space respectively after the views are smoothly scaled; and storing corresponding pixel points of the smoothly-scaled right view and a line-staggered and tessellated module in the third storage space according to the line-staggered and tessellated module stored in the second storage space in advance. The invention also discloses a line-staggered and tessellated rendering device of the three-dimensional video. The method has the advantages that the rendering speed is high and the rendered image is clear. In addition, the device is simple in structure and easy to implement.

The invention discloses a digital wireless voice frequency transmission system and method based on a 2.4GHz frequency. Forward error connection (FEC) coding, interleaved coding and corresponding FEC decoding and de-interleaving processing are adopted for 2.4GHz digital radio frequency signals, frequency hopping control and frequency modulation synchronous tracking are adopted for 2.4GHz digital radio frequency signals simultaneously, so that wireless audio transmission error codes or staccato can be avoided effectively, and multi-path interference and discrete co-channel interference can be avoided simultaneously; the signal transmission safety can be effectively improved through encryption; and a digital wireless audio transmission microphone performs low-pass filtering before digitizing voice signals, so that high-frequency digital clutters can be eliminated. Through the digital wireless voice frequency transmission system and method, wireless audio transmission error codes, multi-path interference, electromagnetic interference, discrete co-channel interference and aliasing distortion can be avoided effectively, and the system and the method are high in fidelity and safety and wide in bandwidth.

The invention discloses a method for automatic correction of a digital ground elevation model for low-altitude aerial photogrammetry. The method comprises the steps of: a) generating a digital surface model point cloud by using a digital aerial image of an object captured by a low-altitude UAV; b) extracting target points with elevation abrupt change in the digital surface model point cloud; c) extracting an object edge contour line by using targets point extracted in the step b); and d) correcting the elevation value of the object edge contour line extracted in the step c). The invention utilizes the ground surface height model point cloud data to extract the edge contour line of a building and conduct regularization processing, so as to establish a digital elevation model; and digital differential rectification is carried out on this basis to generate an orthoimage. The method not only can effectively eliminate the jagged distortion at the edge of the abrupt change position of the building elevation in the orthoimage and beautify the orthoimage, but also ensures the plane accuracy of orthoimage and greatly promotes the application of low-altitude UAV aerial photogrammetry technology.

The invention discloses a short-range microwave holographic imaging experiment system and method. An experiment platform is set up through a reconstruction target, a scanning device, a scanning control device, an image processing device and a vector network analyzer to study the short-range microwave holographic imaging technology. The scanning device can complete scanning of the reconstruction target just through two horn antennae, so that the cost is greatly lowered, and experiment errors are reduced. The vector network analyzer is adopted for achieving the cross-correlation phase solution of signals to obtain S parameter data of the target, so that the real-time performance is good, the efficiency is high, and the deign cost and the complexity are greatly lowered. The image processing device processes holographic data of the target according to the convolution kernel grid method, so that the aliasing effect caused by grid deviation is effectively eliminated, and the definition and the imaging quality of a target reconstructed image are improved. By means of the short-range microwave holographic imaging experiment system and method, problems probably existing in the practical application of the short-range microwave holographic imaging technology can be better found out and solved, and therefore the development of the short-range microwave holographic imaging technology in the practical application can be promoted.

The invention discloses a distance and velocity two-dimensional high-resolution processing method of sparse frequency hopping signals. The method comprises the following the steps that: frequency hopping codes are randomly extracted from a frequency set so as to form the transmission waveforms of the sparse frequency hopping signals; initial velocity compensation is performed on echo sampling baseband signals; velocity dimension alignment is performed; cross term compensation is performed; distance-dimension iteration interpolation sidelobe suppression high-resolution processing is performed; velocity-dimension inverse Fourier transform processing is performed; and Doppler iterative interpolation high-resolution processing is performed. With the method of the invention adopted, a distance sidelobe suppression problem due to random frequency hopping or spectrum discontinuity in radar signal distance and velocity two-dimensional processing can be solved, and velocity resolution can be improved.

The invention discloses a dryer temperature control system based on a bridge type filter circuit. The dryer temperature control system is mainly composed of a single-chip microcomputer, a display, a temperature value prestoring module, an A/D conversion module, a heater CZ, a power supply and a temperature sensor connected with the A/D conversion module, wherein the display, the temperature value prestoring module, the A/D conversion module, the heater CZ and the power supply are all connected with the single-chip microcomputer. The dryer temperature control system is characterized in that the bridge type filter circuit is connected between the A/D conversion module and the single-chip microcomputer in series, a three-line drive filter circuit is connected between the single-chip microcomputer and the heater CZ, and the three-line drive filter circuit is composed of a drive chip U, a bootstrapping amplification circuit connected with the drive chip U, and an active power filter circuit with the input end connected with the output end of the bootstrapping amplification circuit and the output end connected with the heater CZ. The dryer temperature control system is stable in performance, high in practicability and capable of ensuring stability of the drying temperature of a hot wind type dryer.

The invention relates to a real time wide view ultrasonic imaging device and method. The method comprises the steps of acquiring an image, registering the image, fusing the image and carrying out edge optimization. The device comprises a wide view image acquisition module, a wide view image registration module, a wide view image fusion module and a wide view image edge optimization module. The method and the device which are provided by the invention have the advantages that ultrasonic image information of a continuous sequence is directly acquired from the image acquisition module for carrying out image registration and image fusion, the ultrasonic image information does not need to be acquired from a static video, then real time map making is realized by combining an efficient algorithm in the invention, and great help is provided for operation and diagnosis of a user.

The invention relates to a processing method of digital images, in particular to an image de-interleaving method based on block partitioning. The method comprises the following main steps of: a. partitioning input images into a plurality of image blocks in equal size; b. calculating a basic motion area and a non-basic motion area according to the difference of an image block corresponding to the front image and the back image; c. further calculating an expansion motion area at the non-basic motion area; d. carrying out de-interleaving treatment on the non-basic motion area and the expansion motion area. According to the image de-interleaving method based on block partitioning, the area in block, which needs de-interleaving treatment can be searched effectively; and details of a static image area are remained; sawteeth at edges of a motion target are eliminated effectively; and subjective feeling of an image sequence is improved greatly.

The invention relates to a depth image filtering method and device, computer equipment and a storage medium. The depth image filtering method comprises the steps: obtaining information of a first depth image and information of a first image of a current image; obtaining a second pixel value set from the first pixel value set according to a difference value between a pixel value at a target position in the first image and a pixel value in a preset neighborhood range of the target position; obtaining a second depth value set from the first depth value set according to the second pixel value set,the second corresponding relationship, the third corresponding relationship and the first corresponding relationship; and filtering the first depth image according to the second depth value set to obtain a second depth image. Therefore, the sawtooth phenomenon existing in the filtered image can be eliminated to a great extent, and the edge accuracy is improved, and the main body edge of the depthimage is better attached to the main body edge of the color image or the gray level image.