50 results about "Impulse detector" patented technology

A system for detecting and correcting impulse noise present on an input data signal includes an impulse detector module receiving an input data signal and producing as output an correction enable signal indicating when an impulse correction is required. An impulse corrector module receives the input data signal and a correction enable signal and produces a corrected data signal, e.g., having the impulse canceled or blanked, as output. A reliability estimator and selector module receives the corrected data signal and the input data signal and selects as output the input signal which is more reliable. In one embodiment, the impulse detector includes first and second complementary impulse detectors, the outputs of which are analyzed by an enable and correction module to produce an impulse detection signal with improved accuracy. Preferably, the enable and correction module also indicates the most appropriate type of impulse correction in accordance with the detection signals from the complementary detectors. A novel system and method of detecting impulses based on Gram Schmidt techniques is also presented. In this method, one or more channels of a multi-channel data signal are kept free of data. When a whitening filter is applied, impulses on these quiet channels are emphasized. The Gram Schmidt technique exploits this fact to provide for improved impulse detection. The system can be modified to detect other types of low dimensionality noise.

A preprocessor system (10) reduces random noise in video pixels by providing a memory (19) arranged to store first pixels processed during a first time period. A motion detector (300) responds to differences between the first pixels and second pixels processed during a second time period after the first time period to generate corrected motion signals. A first filter (100) generates first filtered values in response to the differences and the corrected motion signals. An impulse detector (244) generates control signals in response to detection of impulses, and an impulse reducer (250) generates second filtered pixel values in response to the first filtered values and the control signals.

An apparatus, method, and computer program product for an interactive toy vehicle that provides new structures and combinations of features for enhancing education and amusement, particularly for an improved small-scale vehicle toy that produces feedback (e.g., sounds or lights and a motorized output event) directly related to the amount of a child's input. The apparatus, method, and computer program product for a toy vehicle includes: a chassis; a motive element, coupled to the chassis, for moving the chassis; an impulse detector for generating an impulse signal responsive to one or more impulses applied to the chassis; and a controller, coupled to the chassis and responsive to the impulse signal, for: counting a number N of impulse signals received during a setup period; determining an operational mode responsive to the number N; setting a duty mode for the motive element responsive to the operational mode.

The present invention discloses a multiple-nuclide gamma imaging system and method and belongs to the field of medical imaging. The multiple-nuclide gamma imaging system comprises a multiple-nuclide tracer injection module, a multi-nuclide scintillation crystal detector module, a configurable circuit module and an image reconstruction and imaging module. The multiple-nuclide gamma imaging method comprises the following steps: S1, starting the imaging system, setting acquisition time of the imaging system, and injecting 11C, 13N, 15O and 18F labeled compounds into an imaging object; S2, obtaining a decay event emission gamma pulse data set by positioning a gamma detector; S3, outputting an electrical signal (scintillation pulse) by a silicon photomultiplier; S4, conducting time discrimination, energy discrimination, data acquisition and coincidence processing by a detector; and S5, displaying images in a tomographic manner by a computer. The disclosed multiple-nuclide gamma imaging system and method can obtain more comprehensive data than the prior art, comprehensively analyze multi-molecule events and related influences, reduce requirements on the total gamma photon counting, reduce irradiation risks on organisms and improve a signal-to-noise ratio of reconstructed images.

The invention relates to a method and device for testing a calibration light source by using an X-ray pulse detector. The device comprises an X-ray pulse generation system and a standard detector calibration system, wherein the X-ray pulse generation system is used for generating X-ray pulse for testing the calibration light source through the standard detector calibration system. The method and device for testing the calibration light source by using the X-ray pulse detector have the advantages of being low in manufacturing cost, exquisite, scientific and reasonable, quantitative in parameter and stable in performance.

An impulse-reducing module (200) reduces random noise in video pixels by providing an impulse detector (244) and an impulse reducer, such as a median filter (250). The impulse detector (244) generates filter control signals in response to detection of impulses, and the median filter (250) generates filtered pixel values in response to the filter control signals. The control signals set the median filter to a plurality of filter operating modes.

The invention discloses a multi-defence area electronic perimeter and a protection method thereof. The multi-defence area electronic perimeter comprises a central controller (1), a combined aural and visual alarm (8), an electronic mimic board (9), at least one pulse detector (2) and a front-end perimeter (3) connected with the pulse detector (2), wherein the combined aural and visual alarm (8) and the electronic mimic board (9) are connected to the central controller (1); and the central controller (1) is connected with the pulse detector (2) by a bus. The multi-defence area electronic perimeter has the beneficial effect that an alarm signal can be independently output to an important defence area to realize the defence area level linkage management of the important defence area and other pieces of security equipment; in addition, each defence area can be subjected to defence organization, defence withdrawing, bypass, high-voltage and low-voltage working mode switching, pulse grid output voltage regulation, system alarming sensitivity regulation, recording and printing of the alarming situation of each defence area and the like. The multi-defence area electronic perimeter has the characteristics of simple structure and the like and is safe and reliable.

The invention discloses a laser power detection device and a detection method thereof. The device is an attenuator formed by arranging two white stone glass mirrors between a laser (1) to be detected and an optical detector (4), wherein the first white stone glass mirror (3) forms a 45 DEG angle with the light path of the laser (1) to be detected and is arranged above the light path, the second white stone glass mirror (2) is located on the reflecting light path of the first mirror, and the mirror surface of the second white stone glass mirror (2) is parallel to the light path of the laser (1) to be detected; the optical detector (4) is located on the reflecting light path of the second mirror on the back surface of the first mirror, and all the output ends of the optical detector (4) comprising an optical power detector and an optical pulse detector are electrically connected with the input end of a data processing unit (5). The method comprises the following steps of: firstly, respectively processing signals output by the optical power detector and the optical pulse detector; and then, sending the obtained power value and the obtained pulse number to a display. The device has simple structure, small size and easy use, can be used for continuously measuring the laser power and the pulse number, and can also be used for measuring a high-power laser.

The invention discloses a TDLAS (Tunable Diode Laser Absorption Spectroscopy) gas monitoring device having a time division multiplexing function. The device comprises a DFB (Distributed Feed Back) laser used for outputting a light signal to an electro-optical modulator; the electro-optical modulator is connected with an air chamber unit through an optical circulator; a pulsed light signal fed back from the air chamber unit is input to a photoelectric detector through the optical circulator; the photoelectric detector is connected with a pulse detector and a lock-in amplifier respectively; both output of the pulse detector and the lock-in amplifier is connected with a digital signal processor; the lock-in amplifier is connected with a signal generator. By adopting a time division multiplexing technology, the position of a gas sensor and the gas absorption condition at the position are totally associated so that interferences to sensor signals caused by loss of optical fiber links which are not at the position of the sensor are avoided. All monitoring points can run in a manner of being connected end to end in series by using single-core optical fibers, so that the capacity of the monitoring points supported by the single-core optical fibers is greatly increased and position identification is more direct and reliable.

The invention discloses an overmoded high power pulse detector. A hot carrier effect of a strong electric field in a semiconductor is taken as a basic working principle, and measurement is realized according to resistance variation of the semiconductor. The detector comprises a WR2.8 standard waveguide with a smaller outlet surface, a WR2.8-WR8.0 transition waveguide with an outlet surface changing from small to large, a WR8.0 standard waveguide with a relatively larger outlet surface, a semiconductor detection chip and a matching load at the rear end. The peak power which can bear a pulse can reach 100 W, the response speed is smaller than 1 ns, and the difficulty in detection chip processing and detector integration is relatively smaller. The detector is suitable for high power pulse measurement in a frequency range of 0.3-0.4 THz.

An image sensor includes a photosensitive region that accumulates charge corresponding to received incident light; a transfer gate for transferring all or a portion of the charge from the photosensitive region; a voltage supply having an increasing voltage over time that is applied to the transfer gate; a floating diffusion for receiving the all or a portion of the charge from the photosensitive region and converting the charge to a voltage; an amplifier for receiving and amplifying a signal from the floating diffusion; a pulse detector for detecting a voltage pulse from the amplifier; and a counter for counting clock cycles between initiation of the increasing voltage until a signal is received from the detector which indicates initiation of charge transfer from the photosensitive region to the floating diffusion.

The invention discloses an ultrashort pulse detector based on lateral frequency doubling by using microcrystalline glass as a frequency doubling medium, and the detector comprises a beam splitting module, a beam steering module, a signal generating module and a signal collecting and processing module, wherein the beam splitting module comprises a half -wave plate and a beam splitting component; the beam steering module comprises four mirrors and two half-wave plates; and the signal generating module is highly transparent microcrystalline glass with a frequency doubling effect. The pulse to betested is split by using the light wave beam splitting component, every two of the four mirrors in the beam steering module are placed symmetrically with the angular bisector of the pulse angle afterthe beam splitting as the axis of symmetry to ensure that the two pulses after the beam splitting have equal optical path difference and collinear and opposite propagation directions after passing through the mirrors at both sides, the polarization directions of the pulses are adjusted to be consistent and then incident into the lateral frequency doubling medium, and the pulse wide measurement ofthe ultrashort pulse is realized by analyzing the lateral frequency doubling signal. Compared with the traditional detection method, the detection takes less time and the detection accuracy is high.

The invention provides a terahertz pulse detector based on an electro-optic sampling principle. The terahertz pulse detector comprises an electro-optic crystal, a lambda/4 wave plate, a polarization beam splitter and a differential detector, and the differential detector comprises an avalanche diode and a matching resistor which are connected. The avalanche diode and the matching resistor are arranged in the differential detector and connected, so that signal-to-noise ratio and dynamic range of terahertz signals are increased greatly.

One aspect of the present invention is directed to an apparatus to perform impulse blanking of a received signal at multiple locations of a signal processing path. To effect such impulse blanking, multiple impulse detectors and blankets may be present, in addition to other circuitry. The impulse detectors may operate at different bandwidths, and the impulse blankers may be located at different locations of the signal processing path and may be differently configured.

The invention relates to a front-end fence, in particular to a front-end fence using a line terminator and an electronic impulse detector using the front-end fence. The front-end fence comprises a high voltage detection line which is connected in series with an electronic line terminator; and the electronic impulse detector comprises the front-end fence and an electronic fence host, wherein the electronic fence host comprises a high-voltage rectifier filter circuit and a microcontroller for judging the output signals of the high-voltage rectifier filter circuit, the high-voltage rectifier filter circuit comprises at least two input ends and an output end, the input end is connected with the front-end fence which is connected in series with the electronic line terminator, and the output ends are both connected with the microcontroller. Through the structure of the front-end fence in the invention, the number of host terminals is reduced, thereby simplifying the structure of the host; high voltage and other potential problems existing in 6-wire (or above) electronic fences are solved; and the difficult problem of alarm failure caused by illegal bypass is also solved.

A method for discriminating a noise pulse from a background noise in which a signal of interest is converted to an envelope signal using an entropy-based envelope generator, which envelope signal is then integrated over a plurality of consecutive integrative periods, producing an integrated envelope signal for each of the integration periods. The ratio of the envelope signal at the end of each of the integration periods corresponding to each corresponding said integrated envelope signal is determined and compared with a predetermined threshold signal for each of the integration periods, resulting in a comparison value. The integration period in which the comparison value exceeds the predetermined threshold signal and which is preceded by two integration periods in which the comparison value does not exceed the threshold value represents the point in time at which the noise pulse is detected.