36 results about "Selective filter" patented technology

An electronic device may include wireless circuitry with a processor, a transceiver circuit, a front-end module, and an antenna. The front-end module may include amplifier circuitry such as a low noise amplifier for amplifying received radio-frequency signals. The amplifier circuitry may include non-linearity suppression circuitry that suppresses or reduces non-linear behavior of components such as a core amplification transistor and a degeneration inductor within the amplifier circuitry. The non-linearity suppression circuitry may include an intermodulation distortion suppression circuit having an auxiliary amplification transistor. The non-linearity suppression circuitry may include a frequency-selective filter coupled to the degeneration inductor.

The invention provides a seismic fault identification method and system based on multi-attribute collaboration and spectral domain graph enhancement, and relates to the technical field of seismic exploration, and the method comprises the steps: carrying out the all-directional dip angle and azimuth angle scanning of a seismic data volume, extracting multi-scale guide field information through combining structure tensor decomposition, and executing anisotropic diffusion filtering; calculating characteristic value distribution through a characteristic value coherence algorithm based on the filtering data volume, and determining the structural consistency difference of adjacent seismic traces to obtain a fracture coherence attribute data volume; carrying out azimuth gather sorting and pre-stack time migration processing on the seismic data volume, extracting seismic wave dynamic response characteristics, carrying out Fourier series expansion on the azimuth change rate to obtain a crack indication information data volume, splicing the data volume and executing multi-scale three-dimensional convolution solution, and constructing a spatial dependency graph through a spectral clustering algorithm; spectral domain enhancement features are obtained through spectral domain graph transformation and frequency selective filtering reconstruction, and morphological connectivity analysis is executed to obtain a crack prediction result.

Provided is an illumination device that makes it possible to enhance utilization efficiency of light, and a display device that includes the illumination device. The illumination device includes: a light source that is configured to generate light of a first wavelength; a luminescent body that is configured to wavelength-convert the light of the first wavelength to light of a second wavelength, the second wavelength being different from the first wavelength; and a wavelength selective filter that is provided on a light-incident side of the luminescent body, the wavelength selective filter being configured to transmit the light of the first wavelength and to reflect the light of the second wavelength.

A system and method for combining and separating non-orthogonal signals. A transmitting component includes a set of generators of non-orthogonal signals and an adder for forming a group mixture. A receiving component includes a band-pass selective filter, an analog-to-digital converter and a calculator-solver for separating signals or channels. The system and method are designed to provide an almost ideal channels separation due to a new original group mixture processing procedure performed by the calculator-solver. The system and method provide significant increase in noise-immunity and the achievement of transmission rates that are exceeded the Shannon's Capacity of the group path.

The present invention relates to a wavelength-tunable optical device in which a semiconductor laser diode chip equipped with a heater or a wavelength-selective filter equipped with a heater is in thermal contact with a thermoelectric element, the thermoelectric element is fixed at a constant temperature, and the channel is varied by varying the average power applied to the heater. The invention provides a method for stopping the operation of the heater even if a malfunction occurs in the heater, or for operating the heater regardless of the channel setting, and for varying the channel by changing the temperature of the thermoelectric element.

An optical component can include a substrate. The optical component can further include metasurface elements formed on a side of the substrate. Each metasurface element can provide a wavelength-selective filter, with at least two metasurface elements configured to filter different wavelengths. At least one of the metasurface elements can be comprised of a non-local metamaterial.

An optical device (807) for a head-up display (810) includes one or more holographic optical elements (803) and a filter device (811). The filter device (811) includes a micro-sheeted grating and is designed to angularly selectively filter light.

Circuit arrangement (200), comprising: a sensor, set up to provide an analog signal (204); an analog-to-digital converter (202), set up to receive the analog signal (204) and provide an initial signal (206); a first filter (208) configured to receive a signal based on the first signal (206) and to provide a second signal (210); where the first filter (208) is set up such that: • that the second signal (210) is passed through unamplified in a frequency range from 20 Hz to 10 kHz, and • that the second signal (210) has a gain greater than 0 dB at least from a specified frequency greater than 20 kHz; and a second filter (214) connected to the analog-to-digital converter (202) and configured to provide a third signal (216) based on the first signal, wherein the second filter (214) is configured as a frequency-selective filter to process the signal received by the second filter, that the amplitude of the signal received by the second filter (214) is reduced in a specified frequency range, wherein the specified frequency range has a frequency greater than 20 kHz.

The invention provides a multi-band spectrum selective filtering method based on a programmable metasurface. The multi-band spectrum selective filtering method comprises the steps that a layered damping supporting structure is constructed below a substrate of a programmable metasurface array; preparing a self-compensation type resonance unit array on the layered damping supporting structure; constructing an array-level phase synchronization control network, and carrying out local electric tuning compensation and global phase synchronization on the self-compensation type resonance unit array based on a distributed sensing signal; establishing a sound pressure monitoring and spectrum feedback correction path, and performing adaptive phase correction on the identified acousto-optic coupling interference area by associating sound pressure distribution with time sequence change of a transmission spectrum; according to the method, the programmable metasurface is operated in the vibration and sound pressure environment, a stable multi-band spectrum filtering result is output, and the method can cooperatively solve micro-deformation phase disturbance from the aspects of structural design and active control, so that the spectrum filtering stability of the programmable metasurface in the vibration and sound pressure environment is improved.

The invention discloses an application of a flexible bioelectronic device in bioelectrical signal sensing. The flexible bioelectronic device has an in-situ signal filtering function. The main materials of polyacrylamide, gelatin methacrylamide and chitosan of the flexible bioelectronic device show selective filtering performance, and dynamic noise under target frequency can be effectively filtered out, so that an active in-situ signal filtering function at a molecular level is realized.

The invention relates to a full-color display device and a manufacturing method, a blue light LED chip and a TFT driving system are integrated, and a pixel-level light path isolation structure is constructed by adopting a black glass substrate. A through hole array matched with an LED chip is formed through synchronous laser drilling, a quantum rod solution modified by an olefine acid ligand and photo-cured by a multi-sulfydryl cross-linking agent is filled, and ordered arrangement and submicron patterning of quantum rods are achieved. And in combination with the top wavelength selective filtering reflector and the absorption of stray light by the black glass substrate, the light crosstalk is reduced, and the color saturation and the lighting effect are improved. Further, light-proof glass can be used as a substrate, the substrate and the black glass matrix adopt a homogeneous glass formula, the risk of thermal stress deformation is eliminated, and the preparation process is simplified by a back exposure curing process. The device has the characteristics of high color gamut, wide viewing angle polarization and high resolution, is short in manufacturing period and high in material utilization rate, and is suitable for the field of ultra-high-definition Micro LED full-color display.

Examples described herein provide selective filtering by a network device for continuous 5 GHz and 6 GHz operation. Examples may include receiving, by the network device, a first signal in a 5 GHz band, and generating, by the network device, a second signal in a 6 GHz band. Examples may include selecting, by the network device, a first filter or a second filter to be applied the first signal in the 5 GHz band, wherein the first filter allows a lower frequency band to pass than the second filter in the 5 GHz band, selecting, by the network device, a third filter or a fourth filter to be applied to the second signal in the 6 GHz band, wherein the third filter allows a lower frequency band to pass than the fourth filter in the 6 GHz band, and simultaneously applying, by the network device, the selected first or second filter to the first signal and the selected third or fourth filter to the second signal.

This application discloses an anti-interference error monitoring device, method, system, and electronic device, relating to the field of anti-interference circuit technology. The device includes a signal generation unit, a frequency-selective filtering network, and a digital processing module. The signal generation unit outputs a reference signal for error calibration. The frequency-selective filtering network is disposed between the signal generation unit and the secondary side acquisition circuit of the instrument transformer, used to couple the reference signal and the power frequency signal to form a mixed signal. The frequency-selective filtering network includes an isolation capacitor and a tuning inductor connected in series with the isolation capacitor. The tuning inductor and the isolation capacitor are configured to resonate in series at the reference signal frequency, resulting in low impedance at that frequency and high impedance at the fundamental power frequency and / or higher harmonic frequencies. The digital processing module is used to extract the signal components in the mixed signal and determine the error parameters. This application can be used for online error monitoring of instrument transformers.

An optical arrangement (807) for a head-up display (810) comprises one or more holographic optical elements (803) and a filter arrangement (811). The filter arrangement (811) comprises a micro-louvered grating and is designed for angle-selective filtering of light.

A magnetic field sensor architecture is disclosed that provides improved bandwidth and noise performance through the use of three distinct magnetic sensing elements: a spinning Hall- effect sensor for low-frequency and DC sensing, a non-spinning Hall-effect sensor for mid- frequency sensing, and a pickup coil for high-frequency sensing. The sensor combination includes a summing stage comprising frequency-selective filtering elements that process the outputs of the sensing elements to achieve a flat composite frequency response from DC to high frequencies. Two independently selectable crossover frequencies are used to decouple noise optimization from ripple suppression. In some embodiments, the pickup coil and non- spinning Hall-effect sensors are combined and processed through a shared path, with a simplified filter structure.

The invention discloses a sound source positioning system for multichannel ultrasonic signal processing. The sound source positioning system comprises a multichannel ultrasonic signal acquisition module, a self-adaptive anti-interference filtering module, a signal processing module, a multichannel data fusion module, a positioning calculation module and a real-time feedback control module, the multi-channel ultrasonic signal acquisition module comprises an ultrasonic sensor array; the self-adaptive anti-interference filtering module comprises a dynamic noise suppression unit, an intelligent spectrum analysis system and a frequency selective filtering unit; the signal processing module comprises a signal amplification unit, a self-adaptive phase correction system and a phase correction unit; the multi-channel data fusion module comprises a time delay estimation unit and a weight distribution unit; the positioning calculation module comprises a three-dimensional space positioning algorithm unit and an error compensation unit; and the real-time feedback control module comprises a signal return unit and a dynamic adjustment unit. According to the method, the anti-interference capability in a complex noise environment is remarkably improved, and the multi-channel signal processing efficiency and the stability of a positioning result are ensured.

The invention discloses an anti-motion blur unmanned aerial vehicle power line broken strand real-time identification method and system, and belongs to the technical field of image processing, and the method comprises the steps: obtaining a power line image shot by an unmanned aerial vehicle as an input image; performing block processing on the input image to generate a plurality of to-be-processed image blocks; performing selective filtering on the to-be-processed image block to obtain an enhanced image block; extracting the enhanced image block to obtain a shallow semantic feature map and a deep semantic feature map; fusing the shallow semantic feature map and the deep semantic feature map to generate multi-scale fusion features; and based on the multi-scale fusion features, identifying the broken strand position of the power line and outputting broken strand position information. According to the method, a selective filtering technology is adopted, and block processing and a multi-scale feature fusion mechanism are combined, so that motion blur interference can be effectively resisted, and high-precision recognition of the broken strand of the power line is realized.

An electromagnetic wave absorber 500 comprises a frequency selective filter layer 400, a dielectric layer 200 positioned below the frequency selective filter layer 400, and a reflective layer 100 positioned below the dielectric layer 200. The reflective layer 100 includes a sheet-shaped first insulator 2 that has a first surface 3, and a first wiring pattern 11 that is provided on the upper surface of the first insulator 2 and is formed from fine metal wires 13. The first wiring pattern 11 has a first point 21, a first line 30 extending from the first point 21, and a second line 33 extending from the first point 21. The angle formed by the first line 30 and the second line 33 is greater than 0 degrees and less than 90 degrees, or is greater than 90 degrees and less than 180 degrees.

The invention provides a high-selectivity dual-passband filter based on a triangular hairpin ring resonator and a manufacturing method, and solves the problems that an existing dual-passband filter is large in circuit size, poor in passband control flexibility and insufficient in selectivity. The filter comprises a transmission line substrate, two microstrip feeder lines, two microstrip feeder lines and two triangular hairpin ring resonators. The resonators are connected through double hairpin structures to form a dual-mode resonator, are symmetrically distributed about the coupling gap, and realize electromagnetic coupling with the transmission line through the coupling gap. Two passbands are respectively formed by odd-mode resonance and even-mode resonance, and a transmission zero point is generated between the passbands by adjusting a coupling gap, so that the isolation and the selectivity are effectively improved. The overall size of the filter is only 17.45 mm * 8.7 mm, the dual-passband characteristic with the center frequency of 4.36 GHz and 6.85 GHz is achieved, the insertion loss is smaller than 0.2 dB, the return loss is superior to-20 dB, and the filter has the advantages of being small in size, high in selectivity, controllable in passband and the like. The method is suitable for the wireless communication fields of double-frequency wireless local area network (WLAN), satellite communication and the like.

The invention belongs to the technical field of data management, and discloses a production process data management system of an all-in-one computer. Comprising the following steps: acquiring an original acoustic signal, performing frequency domain selective filtering and unmixing processing on the original acoustic signal, and extracting an assembly acoustic signal; performing preliminary feature extraction on the assembly acoustic signal to obtain a preliminary acoustic feature, identifying a corresponding assembly action, performing targeted feature extraction according to an identification result, and extracting an acoustic feature vector; acquiring a preorder assembly action, determining a current assembly action in combination with predefined process flow information, comparing the current assembly action with the identified assembly action, and judging whether a false detection instruction is generated or not; if the false detection instruction is not generated, dynamically evaluating an assembly quality score, and judging whether risk prompting is carried out or not; intelligent control over the assembling process of the all-in-one computer can be achieved, the assembling precision and consistency can be improved, and therefore the reliability and efficiency of the production process are remarkably improved.

The invention provides a method for filtering T-wave interference, which comprises the following steps of: signal acquisition and preprocessing: acquiring an original electrocardiosignal, and performing three-stage filtering preprocessing on the original electrocardiosignal by adopting an IIR (Infinite Impulse Response) digital filter bank; identifying and positioning a T wave: processing the preprocessed electrocardiosignal, extracting morphological characteristics of the T wave in a suspected T wave region, and confirming the position, time range and frequency of the T wave according to the morphological characteristics of the T wave; filtering the T wave and reconstructing the electrocardiosignal: filtering a frequency component which mainly comprises T wave energy in the preprocessed electrocardiosignal by adopting a selective filtering algorithm, and reconstructing a signal of a frequency region where the T wave is located by adopting a cubic spline interpolation algorithm; according to the reconstructed electrocardiosignals, R waves are recognized, the real-time heart rate is calculated, the systolic period and the diastolic period of the heart are judged according to the time phase relation of the P waves and the R waves, and the parameter adjusting control signals are generated.

The application discloses a kind of mixing light module and passive optical network system, mixing light module includes shell assembly, light emitting receiving component being arranged in shell assembly, light emitting receiving component is equipped with optical port and lens, and is integrated with emitting unit and receiving unit.Emitting unit includes multiple laser assembly and wave combining component, and multiple optical signals are output from optical port after wave combining.Receiving unit includes wave separating optical separating component, first detection component and second detection component, wave separating optical separating component receives mixed frequency optical signal input from optical port, first, receive waveband and emission waveband are separated, then the optical signal of receive waveband is divided into first light beam and second light beam according to optical power, and first light beam and second light beam are respectively incident to two detection components in opposite directions.The application solves the technical problem that multiple system PON uplink signal cannot be independently separated by wavelength selective filter due to wavelength overlap by receiving mode of first wave separation and then light separation.

An angle selective filter for a light projection system including a wavelength conversion material illuminated by an excitation light source in a first wavelength range, the wavelength conversion material re-emitting light in a second wavelength range after excitation by the light in the first wavelength range. The filter is configured to have a first average transmission which is high for light in the first wavelength range and for angles of incidence in the range [γ1,γ2], in a third wavelength range, the filter is configured to have a second average transmission which is high for light having an incidence angle in the range [β1,β2], and a third average reflectivity which is high for light having an incidence angle in the range [β2,β3], after reflection on the wavelength conversion material.

The present invention relates to a filtering method and circuit for a video signal, and a computer-readable storage medium in the technical field of video signal processing. The method comprises the following steps: receiving a video signal, and performing high‑low frequency detection on the video signal to output a detection result; performing first synchronous delay processing on the video signal on the basis of the high-low frequency detection to obtain a first synchronously delayed signal; on the basis of the detection result, performing selective filtering processing on the first synchronously delayed signal to obtain a filtered signal, and on the basis of a filter register delay, performing second synchronous delay processing on the first synchronously delayed signal to obtain a second synchronously delayed signal; and on the basis of the detection result, selectively outputting the filtered signal and the second synchronously delayed signal to obtain a filtered output signal. The present invention solves the problem of increased circuit power consumption of existing filtering circuits caused by performing a filtering operation on both high-frequency signals and low-frequency signals during the filtering operation of video signals.

A wavelength multiplexer / demultiplexer includes a first collimator, M-number of second collimators, M-number of wavelength selective filters, and a base plate. Each of the wavelength selective filters includes a substrate having optical transparency and a multilayer film. The substrate includes a first main surface and a second main surface, and a bottom surface facing a placement surface of the base plate. The multilayer film is formed on the first main surface and transmits an optical signal in a specific transmission wavelength band and reflect an optical signal in a wavelength band other than the specific transmission wavelength band. Each of the wavelength selective filters is fixed to the placement surface by a cured adhesive. The cured adhesive is in contact with the bottom surface and is in non-contact with the multilayer film in at least one wavelength selective filter among the wavelength selective filters.

An integrated wavelength selective filter device (10; 20; 30; 40) comprising a first optical element (14) for directing received radiation in a direction defined by a first angle (a) and a second optical element (15) which is a diffractive element configured to diffract the directed radiation with a second angle such that, for a single reference wavelength, the diffracted radiation is directed into a propagation medium to travel therein to a predetermined location of the first optical element so as to filter radiation having a wavelength substantially matching the reference wavelength from radiation having a substantially different wavelength. The propagation medium is formed of a material different from any material of the substrates of the first and second optical elements.

The invention relates to a layer structure (10) for wavelength-selective filtering and / or reflection of light, comprising at least two sublayer structures (12a, 12b), wherein each sublayer structure (12) comprises at least two layers (14a, 14b), wherein the layers (14) within a sublayer structure (12) have a high or a low refractive index, and wherein the at least two layers (14a, 14b) of a sublayer structure (12) are arranged alternately with respect to the refractive index within the respective sublayer structure (12), at least one absorption layer (16), wherein the absorption layer (16) is arranged between the two sublayer structures (12a, 12b), and wherein the absorption layer (16) has a material resonance such that an absorption spectrum of the absorption layer (16) has a decreasing absorption edge (42) towards longer wavelengths,wherein a wavelength of the absorption edge (42) is ±10% of a longer wavelength end of a stop band (18) of the layer structure (10) at an angle of incidence of 0 degrees. , Furthermore, the invention relates to the use of the above layer structure (10) as an interference filter and / or as an interference mirror.

The invention discloses a selective light filtering liquid material, a preparation method and a light filtering element. The liquid material is a homogeneous-phase or semi-homogeneous-phase coatable dispersion system, and comprises the following components in parts by mass: 35-55 parts of a polyurethane flexible matrix, 15-25 parts of a polyether modified organic selective light absorption material, 8-15 parts of a nano titanium oxide dispersion phase, 10-20 parts of an acrylate-reinforced polyurethane hard film-forming component, 3-8 parts of a polyurethane bonding aid and the balance of a solvent. According to the invention, the polyether chain segment modified light absorption material and the surface-treated nano titanium oxide are compounded, so that the dispersion stability of functional components in a resin matrix is remarkably improved, and the problems of high haze, easiness in precipitation and poor mechanical property of a traditional filtering coating are solved. The light transmittance of the coated and cured composite element at the wave band of 200nm-505nm is less than or equal to 5%, the light transmittance at the wave band of 600nm-1000nm is greater than or equal to 80%, and the composite element has high hardness (greater than or equal to 2H), strong adhesive force and excellent damp-heat aging resistance, and is particularly suitable for red light windows of beauty instruments and photoelectric sensing equipment.

This invention discloses a frequency-selective broadband power divider and its design method. The method includes designing the power divider; designing a first frequency-selective filter and a second frequency-selective filter; connecting the first and second frequency-selective filters to the power divider, wherein during connection, resonant microstrip transmission lines near the output terminals of the first and second frequency-selective filters are deleted, and a microstrip transmission line is added between the first and second frequency-selective filters and the power divider to obtain a frequency-selective broadband power divider model; the frequency-selective broadband power divider model is debugged and simulated to obtain the final frequency-selective broadband power divider model. This invention reduces debugging difficulty and decreases circuit size and losses by using the added microstrip transmission line for filter resonance and impedance matching between the filter and the power divider.

The present disclosure provides a compact fingerprint and finger vein combined scanner comprising a cemented prism pair (1') with first prism block (3) and second prism block (2), selective interference coating (7) between the prism blocks that transmits red wavelength light and reflects near-infrared wavelength light at different incidence angles, red LED (4) illuminating finger placement surface (6) on the first prism block (3), at least one near-infrared LED (5) illuminating the finger placement surface (6), imaging lens system (8) comprising First imaging lens (8a) and Second imaging lens (8b) arranged in sequence receiving light from the cemented prism pair (1'), aperture filter (9) between the imaging lens system (8) and imaging detector (10) with wavelength-selective filter transmitting red wavelength light and absorbing near-infrared wavelength light and central opening transmitting both wavelengths, and two-dimensional imaging detector (10) receiving light through the imaging lens system (8) and aperture filter (9).