221 results about "Transition band" patented technology

The present invention incorporates a flexible RF seal into the ground face of a typical connector. The seal comprises a flexible brim, a transition band, and tubular insert with a insert chamber defined within the seal. In a first embodiment the flexible brim is angled away from the insert chamber, and in a second embodiment the flexible brim is angled inward toward the insert chamber. A flange end of the seal makes a compliant contact between the port and connector faces when the nut of a connector is partially tightened, and becomes sandwiched firmly between the ground surfaces when the nut is properly tightened. The present invention allows the connector to make a uniform RF seal on a port even with a range of tightening torques.

The invention discloses an elastic wave forward simulation technology based on the space-time dual-variable grid, comprising the following steps: determining the stability conditions of the target area and the background area according to the speed parameter and the elasticity parameter of the underground medium aiming to the known earthquake geological model so as to calculate the size of the space grids with different dimensions and perform the discretization process to the speed field; obtaining the space arbitrary precision difference formula of the grid point variables with different dimensions by using the Taylor's formula and the finite difference technology, which is the arbitrary even order accuracy space difference formula of the space constant grid operator and the space variable grid operator, and calculating the wave field values of the precise division area, the rough division area and the middle transitional belt area by using the deduced space difference formula; in the wave field extrapolation process of the time layer, using different time sampling intervals to different grid division areas and meet the partial stability condition, obtaining the wave field value of the precise grid point in the precise time layer and the wave field value of the rough grid point in the global time layer; in each global time layer, transmitting the wave field value of the precise grid division area to the rough grid division area, thereby obtaining the space wave field value of the whole speed field at the said moment; performing the wave field extrapolation on each time layer by the said method and obtaining the forward simulation record of single cannon. The partial stability condition of the shallow layer can be met, so as to avoid the frequency dispersion noise.

Methods and apparatus for reducing transmit emissions are described herein. The transmit out of band emissions in an adjacent band can be reduced while complying with existing wireless communication standards through utilization of one or more of reduced transmit bandwidth, transmit operating band offset, and channel index remapping. The transceiver can support a receive operating band that is substantially adjacent to a band edge. The transmit operating band can be offset from an adjacent frequency band, and can use a narrower operating band than is supported by the receiver. The transmit baseband signal can have a reduced bandwidth to reduce the amount of noise. The frequency offset can introduce a larger transition band between the transmit operating band edges and the adjacent frequency band of interest. The transceiver can remap channel assignments to compensate for the frequency offset such that the frequency offset introduced in the transmitter is transparent to channel allocation.

The present invention provides an initiator system including an infrared-absorbing compound that exhibits an electronic transition band in the near-infrared region, an initiator, and a metallocene compound. Upon exposure to infrared radiation, the initiator system is capable of producing radicals sufficient to initiate a photopolymerization reaction. Suitable infrared-absorbing compounds include indocyanine dyes, for example. Trihalomethyl triazine compounds and onium compounds are suitable initiators. Suitable metallocene compounds include ferrocenes and titanocenes. The present invention also provides an infrared-sensitive composition including an ethylenically unsaturated polymerizable component, an infrared-absorbing compound that exhibits an electronic transition band in the near-infrared region, an initiator, and a metallocene compound. The infrared-sensitive composition provides improved photospeed and sensitivity in some embodiments. A printing plate precursor including an infrared-sensitive coating is also provided. The printing plate precursor exhibits enhanced shelf life in some embodiments. A method of making a printing plate precursor and a method for making a printable lithographic printing plate are further provided by the invention.

An inexpensive compact band rejection filter realizes a high sharpness of a filter characteristic at ends of passbands and has a large attenuation. In the band rejection filter, at least one of a plurality of elastic wave resonators, which contributes to formation of a transition band, has a propagation angle larger than those of the other elastic wave resonators. Accordingly, the at least one of the plurality of elastic wave resonators which contributes to the formation of the transition band has an electromechanical coupling coefficient that is smaller than electromechanical coupling coefficients of the other elastic wave resonators.

A method and a computer program product for sample rate conversion that features distributive or hybrid filtering to reduce unwanted artifacts, such as aliasing and the computational requirements to avoid the aforementioned artifacts. The method includes receiving, at a first sample rate, a plurality of data points, associated with a first signal, operating on the plurality of data points to associate the signal with a predetermined set of parameters, with the set of parameters including a first transition band having an image associated therewith; and varying the sample rate associated with the first signal by interpolation with an interpolator having associated therewith a second transition band, with the width associated with the second transition band being a function of a spectral separation between the first transition band and its image, wherein a second signal is produced having a sequence of data samples approximating the first signal.

The invention relates to a near-infrared narrow-band filter piece and an infrared imaging system. The near-infrared narrow-band filter piece comprises a substrate and an IR film system arranged at oneside of the substrate. The IR film system consists of first high-refractive-index film layers and first low-refractive-index film layers that are plated alternately; and the first low-refractive-index film layer is arranged at the outermost layer of the IR film system. The IR film system has one passband band, two transition bands, and two cutoff bands in a wavelength range of from 800 to 1200 nm; the passband band is arranged between the two cutoff bands; and the transition bands are arranged between the passband band and the cutoff bands. The passband band has a central wavelength; and thedrift amplitude of the central wavelength of the passband band is between 7 nm and 13 nm within an incident angle changing range of from 0 degree to 30 degrees. Therefore, on the premise that the hightransmittance is guaranteed, the drift of the central wavelength of the passband of the narrow-band filter piece is reduced with the angle and the imaging quality is improved.

The invention discloses a method for improving precision of a spaceborne linear array static infrared horizon sensor. The method comprises the following steps of initial judgment of an earth-space boundary position, selection of a reference signal, normalization of a detector signal, selection of a boundary judgment element, high-precision detection of the earth-space boundary position, and high-precision altitude calculation. Combined with the characteristics of the horizon sensor and based on the characteristic that a detection element signal corresponding to a transition zone changes regularly with the movement of the earth-space boundary in a field of view of the detector, the invention creatively provides a method for locating the earth-space boundary position highly precisely by the boundary judgment element to improve the measurement precision of the horizon sensor. By the invention, the problem that an instantaneous field of view angle of a detection element, the measurement precision and the altitude measurement range are restricted mutually in the design of the conventional horizon sensor is solved. The method has the characteristics of small calculation quantity and high generality, and is easy to implement, so the method can be applied to spaceborne linear array static infrared horizon sensors with different orbit heights.

A slimming outer garment covering at least a portion of a wearer's lower torso having a garment torso portion for covering the wearer's lower torso with an encircling top edge and a transition band having an edge attached to the garment torso portion along the encircling top edge. The transition band has face-to-face interconnected elastic inner and outer members, where the inner member has a generally straight configuration when in an independent unstretched state and the outer member has an upwardly-directed curved contour when in an independent unstretched state.

The invention belongs to the technical field of a microwave technology and an aircraft stealth technology, and discloses a dual-band wave absorption frequency selective surface system, a design methodand an aircraft. The dual-band wave absorption frequency selective surface system is provided with a dielectric support plate, resistant thin film square rings and a circular-groove frequency selective surface, wherein the resistant thin film square rings are periodically arranged on an upper surface of the dielectric support plate, the circular-groove frequency selective surface is arranged on alower surface of the dielectric support plate and comprises a dielectric plate and a metal layer, the metal layer is arranged on an upper surface of the dielectric plate, the thickness of the metal layer is not considered, and circular grooves are periodically formed in the metal layer. By the dual-band wave absorption frequency selective surface system, k-band wave transparent / dual-band wave absorption can be achieved, an array pattern is compact, and good stability is achieved under an oblique incidence condition; the dual-band wave absorption frequency selective surface system is simple instructure; compared with a multi-layer structure, the dual-band wave absorption frequency selective surface system is only provided with the upper-layer resistant film, the intermediate-layer dielectric support plate and the lower-layer frequency selective surface, and is lighter and is lower in profile; and a transition band between the wave transparent band and the wave absorption band is small, and the wave absorption effect is good.

The invention provides an optical filter and a preparation method thereof, a fingerprint recognition module and an electronic device and relates to the technical field of optical film. The optical filter comprises a transparent substrate and a first long wave pass film system and a second long wave pass film system arranged on the two sides of the transparent substrate; the film system structure of the first long wave pass film system includes (0.5HL0.5H)^10, and center wavelength of a transition tape is 700-900 nm; the film system structure of the second long wave pass film system includes (0.5HL0.5H)^14, and center wavelength of a transition tape is 780-900 nm, wherein H refers to a high-refractivity film layer, and L refers to a low-refractivity film layer. The optical filter has high transmittance at 830-950 nm band and wide stop-band at 300-750 nm spectrum; passband and stop-band features of the optical filter with the spectrum are greatly modified, so that the service requirementof a fingerprint sensor module can be met.

Embodiments disclosed herein relate to programmable duplexers. The frequency pass band of the programmable duplexer is changed according to a selection of a channel-pair selection to control or maximize the transition band between the receiver path and the transmitter path. The programmable duplexer permits selections of desired pass bands without the need for multiple duplexer filters. As an additional advantage, the transmission band requirements become less sensitive to manufacturing tolerances and temperature variations.

The invention provides a method for processing a signal. The method includes the steps of conditioning the original signal according to preset conditioning conditions to obtain an analog signal; carrying out A / D conversion on the analog signal to obtain a digital signal; carrying out spectral analysis on the digital signal with an FIR algorithm and an FFT algorithm to obtain a first signal; correcting the frequency and the amplitude of the first signal with a preset correcting algorithm to obtain a second signal; compensating for the amplitude of the second signal according to a preset compensation rule to obtain a third signal, and outputting the third signal to a calculation device. By means of the method, after spectral analysis is carried out on the digital signal with the FIR algorithm and the FFT algorithm, the frequency and the amplitude are corrected, and the amplitude is compensated. The signal is corrected, spectrum leakage of the FFT algorithm is reduced, and meanwhile the picket fence effect of the FFT algorithm is buffered; amplitude compensation is carried out on the signal, FIR band-pass fluctuation and transition band attenuation are overcome, and the accuracy of the signal processing result is improved.

The invention discloses a residual stress testing method based on the profile method, and an ancillary device. The method is characterized in that a sample is appropriately polished and wiped for pretreatment, and aluminum foils are firmly adhered to cutting paths as transitional belts; the sample, to which the transitional belts are adhered, is cut open through a special linear low-speed wire cutting device along a surface to be detected; the cut surface is scanned through a laser profiler to obtain deformed profile data; and data processing is carried out to obtain displacement changes of points on the cut surface before and after stress relief. The testing method disclosed by the invention has the advantages that finite element analysis is carried out through the stress-strain relationship, so that the residual stress distribution of a whole section is finally achieved; the testing method can achieve the residual stress distribution of the whole section, has no requirements for theshape and the material of a tested component, and has the characteristics of high economy and efficiency, and high simplicity in operation; and through the transitional belts adopted in the method, the influence of edge effect is reduced, so that the testing precision is improved.

The invention belongs to the technical field of antennas and discloses an ultra wide band antenna with reconfigurable frequency. The antenna comprises a medium board, a micro band feeder, a transition micro band, a switch controller, a printed monopole which is positioned on the upper surface of the medium board, and a feeder grounding board which is positioned on the lower surface of the medium board, wherein the printed monopole comprises N radiating units which are arranged linearly; adjacent two radiating units are connected through an electronic switch; the switch controller is positioned on the lower surface of the feeder grounding board; and a control line of the switch controller is connected with (N-1) electronic switches for switching on or off the (N-1) electronic switches. The ultra wide band antenna provided by the invention overcomes the defects of the technologies of a traditional ultra wide band antenna and an antenna with reconfigurable frequency; the antenna can be switched for work in N continuous frequency sub bands and can cover an ultra wide band; simultaneously, the antenna also has the characteristics of flat gain, simple structure and the like in the ultra wide band; and the antenna can be applied for the fields of stepped-frequency ground penetrating radar systems and the like.

The invention provides an energy carbon emission remote sensing estimation method based on night light images. The method includes the following steps that first, urban construction land is extracted on the basis of the night light images; second, energy carbon emission is simulated on the basis of the night light images. The first step includes the steps that eleventh, a transition zone of the construction land and non-construction land is recognized; twelfth, the construction land beyond the transition zone is extracted; thirteenth, the construction land contained in the transition zone is extracted; fourteenth, all the construction land is obtained. The second step includes the steps that twenty-first, the total value of night light data within all the construction land of an area to be measured is extracted; twenty-second, multiple leading industry types are divided; twenty-third, energy carbon emission inversion models of different leading industry types are constructed. By building the energy carbon emission models, energy carbon emission of any region can be predicted according to the night light images and different leading industry types.

The invention provides a dissipation type broadband frequency selection surface radar cover. The cover comprises a first skin layer, a first frequency selection layer, a first core layer, a second frequency selection layer, a second core layer, a third frequency selection layer and a second skin layer, wherein the first skin layer, the first frequency selection layer, the first core layer, the second frequency selection layer, the second core layer, the third frequency selection layer and the second skin layer are successively arranged in the thickness direction. The first frequency selectionlayer is consistent with the third frequency selection layer.

The invention discloses a design method of an FIR filter based on a variable learning rate neural network, which introduces a variable learning rate algorithm to automatically adjust the value of the learning rate in the course of triangle basis function neural network training so as to improve the learning efficiency and the convergence rate of the neural network. A relative neural network model is built according to the relationship between the triangle basis function neural network and the amplitude-frequency characteristic of a linear phase 4 type FIR filter. The sum of error squares of the amplitude-frequency response of the FIR linear phase filter and the ideal amplitude-frequency response in a whole passband and a stopband is minimized. An FIR high-pass filter and a band-pass filter are designed for optimization with the method, and the result shows that the FIR filter designed by the method has availability and superiority. The designed FIR filter has the advantages of high convergence rate, no overshoot impulse and fluctuation of the amplitude-frequency passband, narrow amplitude-frequency transition band and large attenuation of the stopband.

The invention relates to a gear fault positioning system and method, and belongs to the field of a fault diagnosis technology and a signal processing analysis technology. The gear fault positioning system comprises a signal acquisition module, a signal processing module and a feature extraction module. By use of an order tracking method, frequency fuzziness caused by a phenomenon can be effectively overcome, by use of an angle domain synchronization average technology, random interference components such as a bearing and the like in a gear case can be eliminated, and the purpose of noise reduction is achieved; by use of spectral line editing, the disadvantage of incapability of completely filtering unnecessary frequency components due to existence of a transition zone in a conventional band pass filter can be overcome, and accordingly, a frequency band of interest is accurately filtered; influences exerted by such external factors as noise, rotation speeds, load fluctuations and the like on a phase demodulation effect can be eliminated, abrupt change of signals after demodulation at gear fault positions is more obvious, and gear faults are quite accurately positioned; and the method is easy to master and use, the algorithm meets the real-time performance requirement of an industrial field, and through actual application tests, the algorithm is accurate and reliable.

The invention provides an absorbing and transmitting integrated material with a broadband wave-transmitting window, and belongs to the technical field of artificial metamaterials. The absorbing and penetrating integrated material is composed of an impedance layer and a frequency selective surface layer, the impedance layer is composed of metal layers which are arranged in the centers of the two faces of a dielectric layer respectively and are of special structures, one metal layer is obtained by rotating the other metal layer by 90 degrees, and the center of the metal layer is designed to be of an interdigital structure; the frequency selection layer is provided with three layers of metal to achieve the effect of a three-order filter. Broadband wave-absorbing-wave-transmitting-wave-absorbing effects are achieved through combination of the wave-absorbing band and the wave-transmitting integrated material, the rectangularity of the wave-transmitting band of the wave-absorbing and wave-transmitting integrated material is high, and the transition band of the wave-transmitting band and the wave-absorbing band is narrow. In addition, the frequency responses are almost the same under theincidence of horizontal polarized waves and vertical polarized waves, and the dual-polarization characteristic is achieved.

The invention discloses a method and a device for suppressing narrowband interference of baseband signals. The method comprises the following steps: acquiring the baseband signals of received signals after passing through a pulse shaping filter; carrying out fast Fourier transform for the baseband signals to acquire frequency domain signals of the received signals; filtering frequency point signals in a pass band, a transition band and a stop band of the pulse shaping filter in the frequency domain signals according to the frequency response chrematistics of the pulse shaping filter respectively; and carrying out inverse fast Fourier transform for the filtered frequency domain signals to acquire the baseband signals of the received signals. Compared with the narrowband interference suppression algorithm which adopts an identical threshold and an identical processing method in the prior art, the method and the device after implementation can improve the narrowband interference suppression capacity of a communication system.

A multi-rate audio processing system and method provides real-time measurement and processing of amplitude / phase changes in the transition band of the lowest frequency subband caused by the audio processing that can be used to apply amplitude / phase compensation to the higher subband(s). Tone signals may be injected into the transition band to provide strong tonal content for measurement and processing. The real-time measurement and compensation adapts to time-varying amplitude / phase changes regardless of the source of the change (e.g. non-linear time-varying linear or user control parameters) and provides universal applicability for any linear audio processing.

The invention relates to an ultrasonic imaging post-processing method and a device of the ultrasonic imaging post-processing method. The ultrasonic imaging post-processing method is used for processing output signals of the front end of the ultrasonic imaging beam forming and comprises the following steps: (1) conducting mixing processing to the output signals of the front end of the ultrasonic imaging and an orthogonality I component and an orthogonality component Q are acquired, (2) conducting lowpass filtering processing to two line orthogonal signals through a cascading integral comb filter and meanwhile conducting down-sampling in the middle of cascading integral comb filter. The ultrasonic imaging post-processing method further comprises steps of revising a transitional zone of frequency response of the cascading integral comb filter through a correcting filter. The step (2) further comprises the following steps:(1) sending the orthogonality I component and the orthogonality Q component after the mixing processing into the cascading integral comb filter and an output signal Ii (n) and an output signal Qi (n) are acquired, (2) conducting down-sampling to the signal Ii (n) and the output signal Qi (n) according to post-processing requirements to the signal Iid (n) and the output signal Qid (n), (3) processing Iid (n) and Qid (n) through the cascading integral comb filter and an output signal Iiedc (n) and an output signal Qidc (n) of the cascading integral comb filter are acquired.

The invention discloses a multi-source tiled display system and a display screen gap aberration eliminating method. The multi-source tiled display system comprises a synchronization master machine, and a plurality of display units. Each display unit comprises a slave machine and a display screen driven by the slave machine. The slave machine is connected with the synchronization master machine through a network cable. The synchronization master machine sends a synchronization signal through the network cable to coordinate the playing progress of all of the slave machines. Each display unit comprises an image processing unit. The input end of the image processing unit is connected with the slave machine, and the output end of the image processing unit is connected with the display screen to form data transmission channels from the slave machine to display screen. Adjacent image processing units are interconnected. The image processing unit is used to perform superposition on a received transition zone signal of an adjacent channel and a transition zone signal of the present channel to realize image edge fusion. According to the invention, by generating an image transition zone on circuit hardware, the image edges are fused, so gap aberration can be effectively eliminated visually to realize moving image gap no-aberration display.