297 results about "Switched filters" patented technology

A switched filter signal processing system includes an input terminal for receiving an input signal conveying first signal information in a first time phase and second signal information in a different second time phase. Desired information represents the difference between the first and second signal information. A multiplexed switch filter filters the input signal in the first phase with a first filter to obtain the first signal information and filters the input signal in the different second time phase with a second filter to obtain the second signal information. The system also includes a common filter component, which is shared by the first and second filter, and respective second filter components for the first and second filters. A controller controls the multiplexed switch filter to couple the common filter component to the second filter component of said first filter in said first time phase and to couple the common filter component to the second filter component of the second filter in the second time phase.

A power conversion system comprises a power converter comprising a plurality of semiconductor power switches, an LC filter coupled between an output of the power converter and an electric grid, and a power conversion control system. The LC filter comprises an inductor coupled in series to the electric grid, and a capacitor. The LC filter and the grid result in an equivalent LC circuit comprising an impedance of the LC filter and an impedance of the electric grid. The power conversion control system comprises a damper and a converter controller. The damper receives an LC filter signal and an equivalent LC circuit impedance signal and generates a damping signal. The converter controller receives a current or voltage reference signal, a current or voltage command signal, and the damping signal to generate control signals for driving switching operations of the semiconductor power switches.

Systems and methods are provided for a stacked die configuration of a high isolation switch and a rejection filter where transmit and receive signals are desired to have a high out-of-band rejection and a low loss band-pass region. In some aspects of the invention the high isolation switch is a double pole double throw switch modified to operate as a high isolation single pole double throw (SPDT) switch. In some aspects of the invention the high isolation switch is a conventional high isolation SPDT switch. The switch is mounted on a low profile rejection filter having metallization on a portion of an outer surface of the rejection filter. The metallization on the outer surface of the rejection filter provides an AC ground layer in close proximity to the switch that provides a short coupling path between the switch and the AC ground. The resulting switch-filter component also results in a smaller footprint than if the two devices were mounted individually and / or adjacently. The switch-filter component has applications in devices requiring high isolation between transmit and receive paths, for example use within a front-end module (FEM) of a single antenna, multi-radio device.

In the light source unit 3A, a switching filter section 14, which can switch the RGB filter for normal-light observation and a filter for fluorescent observation on the optical path, is installed in front of the lamp 12, where if the fluorescent image mode is selected, the excitation light in a part of the blue wavelength band is supplied to the electronic endoscope 2A, and the excitation light reflected by the subject side is shielded by the excitation light cut filter 27 in front of the CCD 28 so as to obtain the fluorescent image, and also the signal of the fluorescent image and the signals of the two reflected light images which are set in a predetermined wavelength band are passed through the image processing circuit 38, where a matrix circuit for appropriately allocating the color signals of the R, G and B channels is installed, and as a result, the images can be displayed on the monitor 5 in pseudo-colors in hues which allow easy identification of a normal tissue and a pathologically affected tissue.

An integrated switched filterbank and method of forming an integrated switched filterbank is disclosed. One embodiment includes a switched filterbank that includes an active subassembly, a plurality of active devices mounted to the active subassembly, and a stripline filter subassembly stacked below the active subassembly. The stripline filter subassembly includes a plurality of stripline filters of varying passbands embedded therein, wherein the plurality of stripline filters are coupled to active devices mounted on the active subassembly through a set of contacts extending from the stripline filters through the active subassembly to at least one of the plurality of active devices.

A circuit system for wireless communications via two antennas. The circuit system includes a printed circuit board having a predetermined area devoid of a solder mask. According to the invention, an antenna switch, filter, and power amplifier are mounted on the printed circuit board within the predetermined area. The antenna switch connects the filter and the power amplifier with the two antennas. The filter blocks unwanted frequency components in an RF receive signal from either of the antennas. A transceiver is responsible for down-converting the RF receive signal a baseband receive signal and up-converting a baseband transmit signal to an RF transmit signal. A first matching network coupled between the filter and the transceiver transforms the RF receive signal from single-ended to differential. Likewise, a second matching network coupled between the transceiver and the power amplifier transforms the RF transmit signal from differential to single-ended.

Systems and methods are provided for a stacked die configuration of a high isolation switch and a rejection filter where transmit and receive signals are desired to have a high out-of-band rejection and a low loss band-pass region. In some aspects of the invention the high isolation switch is a double pole double throw switch modified to operate as a high isolation single pole double throw (SPDT) switch. In some aspects of the invention the high isolation switch is a conventional high isolation SPDT switch. The switch is mounted on a low profile rejection filter having metallization on a portion of an outer surface of the rejection filter. The metallization on the outer surface of the rejection filter provides an AC ground layer in close proximity to the switch that provides a short coupling path between the switch and the AC ground. The resulting switch-filter component also results in a smaller footprint than if the two devices were mounted individually and / or adjacently. The switch-filter component has applications in devices requiring high isolation between transmit and receive paths, for example use within a front-end module (FEM) of a single antenna, multi-radio device.

The invention discloses a method for realizing down conversion of a radio frequency (RF) spectrometer by narrow-band local oscillation and switch filtering. RF down-conversion fully utilizes three frequency coordinating modes and divides RF signals into five wave bands for down-conversion; utilizing switch filtering to realize frequency selection of the signal of different wave bands, so that thefirst local oscillation has narrow frequency span and low frequency; utilizing a plurality of band-pass filters in high wave band to realize frequency selection and frequency tuning, so that the design of the RF band filter is easy to realize. The invention has the advantages of simple and easy design, low cost and the like, and can be widely applied in down-conversion modules of economical and hand-hold RF spectrometers, RF receivers and RF network analyzers.

An improved switched filter up-sampling mechanism for scalable video coding. A filter switching mechanism of the present invention takes advantage of the best performance of each of the filters in a collaborative manner. The switching process of the present invention can be generalized to more filter choices and potentially relieve the computational complexity due to the added freedom and flexibility of filter choices.

The invention relates to a method for avoiding ping-pang switch, which comprises: based on the signal quality of present network of user terminal and target switch network, fixing the maximum allowed switch frequency; judging if allowing said switch, the real switch frequency is in the maximum value, if it is in said maximum value, allowing this switch; or else, rejecting said switch. The invention also discloses a device with ping-pang switch filter function whose network switch alarm module has ping-pang switch filter function. The invention can effectively reduce the ping-pang switch frequency generated at the edge of dual-network cover, and release the impact on the network processing ability when leading in the region transfer calling function.

The invention discloses a device and a method of automatically recognizing a candid camera. The device comprises a lighting source, a filter switcher, an image pickup device, an image processor and a control circuit, wherein the lighting source emits visible light and infrared light to irradiate on a to-be-detected area; the filter switcher can switch filters in turn to the front end of the image pickup device to enable the image pickup device to acquire visible light and infrared light images; the image processor compares a brightness difference between the infrared light image and the visible light image and a threshold, and whether a candid camera exists is judged; and the control circuit sends a control instruction to the above parts according to a self-stored program. Through the device and the method of the invention, an illegal photographing behavior can be recognized in an unattended and real-time mode, and the safety of the privacy of people and trade secrets can be effectively protected.

In the light source unit 3A, a switching filter section 14, which can switch the RGB filter for normal-light observation and a filter for fluorescent observation on the optical path, is installed in front of the lamp 12, where if the fluorescent image mode is selected, the excitation light in a part of the blue wavelength band is supplied to the electronic endoscope 2A, and the excitation light reflected by the subject side is shielded by the excitation light cut filter 27 in front of the CCD 28 so as to obtain the fluorescent image, and also the signal of the fluorescent image and the signals of the two reflected light images which are set in a predetermined wavelength band are passed through the image processing circuit 38, where a matrix circuit for appropriately allocating the color signals of the R, G and B channels is installed, and as a result, the images can be displayed on the monitor 5 in pseudo-colors in hues which allow easy identification of a normal tissue and a pathologically affected tissue.

The invention discloses a density-adaptive image salt-pepper noise switching filtering method, which comprises the following steps of: training a plurality of neural networks adaptable to the accurate detection of noise positions under certain noise densities by using training images with different noise densities; rapidly and roughly evaluating the salt-pepper noise densities of the images; selecting corresponding neural networks according to the evaluated salt-pepper noise densities to perform accurate noise detection on the images; and performing window-adaptive switch weighted mean filtering on the images according to the accurately detected noise positions. By the method, the magnitudes of the noise densities can be automatically judged, and the accurate noise detection can be performed by adopting the corresponding neural networks for the densities with different magnitudes.

A power conversion system comprises a power converter comprising a plurality of semiconductor power switches, an LC filter coupled between an output of the power converter and an electric grid, and a power conversion control system. The LC filter comprises an inductor coupled in series to the electric grid, and a capacitor. The LC filter and the grid result in an equivalent LC circuit comprising an impedance of the LC filter and an impedance of the electric grid. The power conversion control system comprises a damper and a converter controller. The damper receives an LC filter signal and an equivalent LC circuit impedance signal and generates a damping signal. The converter controller receives a current or voltage reference signal, a current or voltage command signal, and the damping signal to generate control signals for driving switching operations of the semiconductor power switches.

The invention provides a 2-12GHz broadband microwave front-end circuit and a 2-12GHz microwave signal receiving method. The front-end circuit comprises a channel module and a local oscillator module. The local oscillator module is connected with the channel module and provides local oscillator signals for the channel module. The channel module comprises an amplitude limiting module, a low-noise amplification module, a switch filtering module, a primary frequency mixing module, a filtering amplification module, a secondary frequency mixing module and a medium frequency filtering amplification module. The local oscillator module comprises a crystal oscillator circuit module, a first local oscillator module, a second local oscillator module and a clock module. The first local oscillator module, the second local oscillator module and the clock module are respectively connected with the crystal oscillator circuit module, the crystal oscillator circuit module amplifies crystal oscillator signals output by a crystal oscillator and divides the crystal oscillator signals into three ways, and the crystal oscillator signals are respectively output to the first local oscillator module, the second local oscillator module and the clock module to serve as reference signals. The first local oscillator module is connected with the primary frequency mixing module and provides local oscillator signals for the primary frequency mixing module; and the second local oscillator module is connected with the secondary frequency mixing module and provides local oscillator signals for the secondary frequency mixing module.

A radiographic image capturing apparatus includes a photodetector substrate, a scintillator, a switching filter, and a resetting light source, which are arranged successively in this order. If the switching filter is made permeable to resetting light from the resetting light source, the switching filter allows resetting light to be applied to the photodetector substrate through the scintillator, whereas, if the switching filter is made impermeable to the resetting light, the switching filter reflects at least a fluorescence, which is converted from radiation by the scintillator, toward the photodetector substrate.

The present invention relates to systems and methods that reduce quadra-phase shift key (QPSK) modulator assembly size, cost and complexity via employing microwave monolithic integrated circuit (MMIC) technology. The systems and methods provide MMICs that include positive-intrinsic-negative (PIN) diodes as phase shifters (e.g., binary, reflective, hybrid and switched filter) that mitigate the tight thermal control, complex drive electronics and calibration routines associated with conventional ferrite phase shifters. The systems and methods can be employed in connection with antenna auto-tracking system such as those associated with satellites, aircrafts and spacecrafts. Employing MMIC technology provides for chips that can be consistently fabricated for extremely high frequency (EHF) operation, and that can increase system performance via mitigating parasitic reactance.

The present invention discloses an OAM performance monitoring method and apparatus. The method comprises: a switch receives operations, administration and maintenance (OAM) performance monitoring rules sent by a controller; the switch receives an OAM performance monitoring message, and on the basis of the OAM performance monitoring rules, carries out filter operations on the OAM performance monitoring message; the switch filters out a first OAM performance monitoring message and reports said message to the controller for processing, said first OAM performance monitoring message being a message of the OAM performance monitoring message conforming to the OAM performance monitoring rules. The present invention can reduce controller performance consumption caused by the reporting of performance monitoring delays and packet loss measurement results and can control excessive channel bandwidth occupation.

The invention provides animage salt-and-pepper noise removal method based on a mean value in an iteration switch. By setting a simple noise detection operator, a point-by-point self-adaptive filtering window is conveniently constructed, and noise points are rapidly judged. Due to the fact that pixel gray level values in small areas of an image have high relevance, by means of the small-size 3*3 pixel filtering window, detail information of the image can be effectively reserved, and meanwhile the false detection problem caused by the simple noise detection operator becomes very small. High-concentration salt-and-pepper noise is removed through a layer-by-layer switch filtering method instead of a large-size filtering window, and the noise can be eliminated step by step. Under the high-concentration noise environment, the gray level values of the noise points are replaced with mid values in grey level values of non-noise points, in all directions, in a long distance, mean value filtering is conducted on filtered pixels, and deviation is further reduced. By means of the method, the aim of reserving existing detail information of the image while effectively removing noise is achieved.

The invention discloses an active power filter (APF) and thyristor switched filter (TSF) hybrid compensation device for an electric rig, which comprises a passive part, an active part, an electric quantity data acquisition module of a well site and the compensation device, a control module of a TST, and a control module of an APF. The filtering characteristics of the TSF are improved by utilizing the APF, so that when the TSF works in a combined manner, 2 to 10 times of harmonic currents injected into a power supply system of the well site are controlled within a given value, and the harmonic currents of the well site are prevented from being amplified when different filtering branches of the TSF are switched in a combined manner; and by adopting the structure that the APF is connected in parallel with a fundamental resonance module of a fifth filtering branch of the TSF through a coupling transformer, the capacity of the APF is very small, so that the APF is beneficially controlled, the cost of the whole set of device is reduced, the problem of overlarge harmonic currents occurring when the TSF is switched in a combined manner is effectively solved, and then the tasks of reactive compensation and harmonic elimination of the well site can be completed more safely and more effectively.

The invention discloses a control method for high-power reactive and harmonic dynamic hybrid compensation method. The hybrid compensation system comprises an SVG (static var generator), a TSF (thyristor switched filter) group and a controller, and the SVG and TSFs are parallelly connected to a grid. The three-phase current of the grid between the SVG and the TSFs is taken as a detection object, voltage and current values collected by sensors are processed through the controller, switching signals of the TSFs are acquired according to hybrid logic judgment, most of the reactive power of loads is compensated in a graded manner, and specific subharmonic is filtered out; control parameters of the SVG are acquired according to an instantaneous-power theory, and the surplus reactive power and harmonic of the loads are continuously compensated. A cost-effective scheme for rapid continuous compensation of the high-power reactive and harmonic is provided, impact of switching of passive equipment on the grid can be completely avoided, and harmonic current is avoided flowing to the grid, so that the control method is energy saving, emission reducing, green, environment friendly, good in social and economical effectiveness, wide in application range and especially applicable to the field of oil drilling.

An integrated switched filterbank and method of forming an integrated switched filterbank is disclosed. One embodiment includes a switched filterbank that includes an active subassembly, a plurality of active devices mounted to the active subassembly, and a stripline filter subassembly stacked below the active subassembly. The stripline filter subassembly includes a plurality of stripline filters of varying passbands embedded therein, wherein the plurality of stripline filters are coupled to active devices mounted on the active subassembly through a set of contacts extending from the stripline filters through the active subassembly to at least one of the plurality of active devices.

The invention relates to a real IPv6 resource address filter check technique. Wherein, it is characterized in that: one filter at the outlet of autonomous edge route is distributed with a filter rule generate engine and filter engine cooperated with said route, while the first one will generate filter rule list with real source address filter strategy based on the communication report of autonomous control server, and switches filter strategy; said strategy comprises SPM, SAVE, and inlet filter, etc; the second one has internet control information protocol report processing module, sign processing module, and edge mark module, to check and filter the report from internal network interface of edge route transfer engine based on filter strategy. The invention can flexibly embed filter strategy and the filter rule list provides unique and effective data-level support for embedding filter strategy.

The invention is concerned with broadband low loss switch filter group of surface acoustic wave. The group relates to tow groups of multi-throw switch with one knife and some filters of surface acoustic wave. One group switch joins up the imports of some filters of surface acoustic wave, the other group joins up the fan-outs of some filters of surface acoustic wave and the tow groups of switch is corresponding to each other. The structure to said filter of surface acoustic wave is longitudinal coupling resonant to realize the low loss. Different channels adopt some different longitudinal coupling structure to get as same bandwidth as possible for each channel. The base plate is LiNbO3, LiTaO_3, and so on. This invention affords a kind of switch filter group of surface acoustic wave for broad band to communications system (single channel relative bandwidth is 2%-7.3%), low loss (containing the switch, less than 6.5dB) and higher stop-band limit (more than 40 dB ).

The present invention relates to a high frequency electromagnetic wave transmitter which comprises a frequency demultiplier, a gating switch, a filter, a transmission drive unit, a power amplification unit and an output end resonance loop which are in electric connection orderly. The output end resonance loop is connected with a transmission coil by a coupling transformer and forms an integral resonance loop together with the coupling transformer and the transmission coil. The transmitter uses the coupling transformer, temperature compensation, seven-step elliptic filter and a transistor C-class amplification circuit; compared with the prior art, the transmitter has the advantages of high transmission efficiency, good temperature characteristic, etc. The circuit design of the transmitter can be fit for various kinds of high frequency electromagnetic wave well logging tools with one or multiple transmission frequencies less than 15MHz and can work normally within a large temperature range between 25 DEG C and 150 DEG C.

The invention relates to a design method of an ultra-wideband single-conversion multi-channel digital receiving module. The ultra-wideband single-conversion multi-channel digital receiving module is composed of an analog receiving module body and a digital processing module body. The analog receiving module body processes 2<n>(n=1, 2, 3...) receiving signals and then synthesizes a radio-frequencysignal through a column-wise synthesizer, the radio-frequency signal passes through a section switch filter and then is subjected to frequency mixing and filtering, and a 6 GHz bandwidth wide frequency range signal and a frequency spectrum are shifted to an intermediate frequency of the range being 1-1.4 GHz. The digital processing module enables the input intermediate frequency signal with the bandwidth of up to 400 MHz to be subjected to AD sampling and analog-to-digital conversion, and the sampled signal is directly sent to an FPGA for signal preprocessing. After multiphase filtering channelization processing and amplitude-phase compensation are carried out, 2n-1 channel intermediate frequency digital signals are generated.

The invention provides an integrated optical circuit device for monitoring the temperature of turbine blades of an aero-engine. An integrated optical circuit system is used for measuring the surface temperature of turbine blades, and comprises a three-band temperature measurement optical path, a gas spectrum analyzing optical path, a data acquisition and processing system and a master controller. The infrared radiation emitted by a tested blade is divided into two parts after passing through the optical circuit system. The first part is received by a photoelectric detector after entering the three-band temperature measurement optical path, is processed by a filter circuit and an amplifying circuit and then is analyzed by the data acquisition and processing system. The second part of the infrared radiation enters the gas optical spectrum analyzing optical path. The gas absorption peak is analyzed. A switching controller switches optical filter wheels in the temperature measurement optical path. The integrated optical circuit device provides a gas spectrum analysis function, analyzes the gas absorption spectrum, switches the band used for temperature measurement as required, can avoid the gas absorption peak, reduces measurement errors, and switches filter lens according to use occasions, and provides single-band, dual-band, and three-band temperature measurement functions.

A high-frequency module (10) includes a filter unit (20) including a plurality of filters, a switch unit (30) that is connected to the filter unit (20) and that includes a switch configured to switch filters through which a high-frequency signal passes among the plurality of filters, an amplifying unit (50) configured to amplify the high-frequency signal passing through the filter unit (20), a matching unit (40) that is connected between the filter unit (20) and the amplifying unit (50) and that is configured to perform impedance matching of the amplifying unit (50), and a multilayer substrate (100) provided with the filter unit (20), the switch unit (30), the amplifying unit (50), and the matching unit (40).

The invention provides a simple solution for a broadband transmitter / receiver for which the working bandwidth is split into at least two non-contiguous sub-bands. The invention uses a filtering means 50 which comprises at least two band-pass filters 51 and 52 provided with switching means 53 and 54. The use of two switched filters 51 and 52 makes it possible to use a single synthesizer 6 to scan two sub-bands of the working bandwidth. The frequency synthesizer 6 operates for one sub-band in supradyne mode and for the other sub-band in infradyne mode. In a variant, the invention uses a third filter and divides the bandwidth into three sub-bands.