354results about How to "Reduce noise disturbance" patented technology

The invention discloses a robot indoor positioning and navigating method based on vision, belonging to the field of vision navigation. According to two-dimension codes, the method designs a manpower road sign which is simple and convenient, is easy to recognize, internally contains absolute position coordinates and has certain error correction capability; the road sign is arranged on a ceiling; a camera arranged on the robot, with the optical axis vertical to the ceiling, is used for photographing; the coordinate information included in the road sign is analyzed by road sign positioning of a series of steps such as threshold segmenting of images, extracting of communicating region, profile curve matching and recognizing of road sign characteristic; and the current absolute position and course angle of the robot can be finally obtained by the position estimation arithmetic of the robot. The method has the advantages of reducing the blocking and noise interference, and greatly reducing the processing time and the complexity of surrounding environments of the image processing method.

The invention relates to a method for relationship classification with an LSTM and CNN joint model based on location. The method includes the steps of (1) preprocessing data; (2) training word vectors; (3) extracting location vectors; acquiring the location vector feature and high-dimensional location feature vector of each word in a training set, cascading the word vector of each word with the high-dimensional location feature vector thereof to obtain a joint feature; (4) building a model for a specific task; encoding contextual information and semantic information of entities by use of bidirectional LSTM; outputting the vector of the location corresponding to the marked entities, inputting the output to CNN, outputting two entity nouns and their contextual information and relational wordinformation, and inputting the entity nouns and their contextual information and relational word information into a classifier for classification; (5) training the model by use of a loss function. The method does not need to manually extract any features, the joint model does not need to use additional natural language processing tools to preprocess the data, the algorithm is simple and clear, and the best effect at present is achieved.

A control circuit for LEDs is adapted for controlling brightness of a plurality of LEDs as light source in an LCD. The control circuit comprises a control pulse generator and a plurality of LED direct current supplies. The control pulse generator is used for receiving a brightness adjusting signal and generating a plurality of brightness control pulse signals having the same frequency but different phases according to the brightness control signals. The work cycle of the brightness control pulse signal varies in a predetermined range according to the brightness control signal. The LED direct current provider is coupled to the control pulse generator to drive the corresponding LED according to the brightness pulse signal.

A method and device for determining a single touch or multiple touches is disclosed. A touch related sensing information with a single zero-crossing is used for determining a pair of values, and the locations of a pair of centroids are calculated depending on the pair of values. The distance between the locations of the pair of centroids can be used to determine whether the number of touches is one or more.

The present invention relates to a packaging substrate structure having an semiconductor chip embedded therein and a method for manufacturing the same. The structure comprises: a substrate body having a through cavity, wherein the substrate body is a multilayer board which comprises a core board and a first built-up structure disposed on each of the opposite surfaces of the core board; an semiconductor chip disposed and fixed in the cavity, wherein the active surface of the semiconductor chip has a plurality of electrode pads thereon; and a second built-up structure disposed on at least one surface of the substrate body as well as the surface of the semiconductor chip, wherein the second built-up structure has a plurality of conductive vias conducting to the first built-up structure. The present invention can reduce the stress imposed on the surface of the semiconductor chip and increase the reliability of the whole package structure.

A driving method for a touch screen is disclosed. The touch screen includes a display panel, a touch panel, and a control circuit. Each of a plurality of display cycles includes at least two first time sequences and at least two second time sequences. The method includes, during each of the first time sequences, generating a plurality of scanning control signals for a display scanning line driving circuit, and, in response to the scanning control signals, delivering a plurality of scanning signals to different display scanning lines. The method also includes, during each of the second time sequences, generating a plurality of scanning control signals for the touch scanning line driving circuit, and, in response to the scanning control signals for the touch scanning line driving circuit, sequentially delivering scanning signals to all of the touch scanning lines of the touch panel.

The invention provides a method and apparatus for controlling brightness of illumination systems, illumination systems and display using the same. The apparatus includes a photo-sensor and a control circuit. The photo-sensor detects a luminous output of the illumination systems and correspondingly outputs a detection signal. The control circuit gets the detection signal during the light source being turned off, and adjusts and controls the brightness according this feedback signal. The method and apparatus of the invention can offer a stable output to illumination systems and displays using the same.

A method and device for dual-differential sensing is disclosed. The sensing information can be generated from signals provided by a sensing device with a plurality of sensors. Each value of the sensing information corresponds to signals of three sensors, respectively. The sensing device is flexible and configured on a display. The noise effect of the display on the signal of each sensor corresponds to the distance between the display and the sensor. Besides, the noise effect of the display on each value of the sensing information corresponds to the distances between the display and the three sensors, respectively.

A real-time physiological signal measurement and feedback system is suitable to be worn on a body part of an user for decreasing the noise of motion, and includes a sensor module, a signal processing module and a feedback platform. The sensor module includes a first magnetic unit having a light emitting diode and a second magnetic unit having a photo-detector. The light emitting diode illuminates a light beam passing through the body part and being received by the photo-detector so as to generate an electric signal when both of the first and the second magnetic units attract mutually to sandwich the body part. The signal processing module converts the electrical signal into a digital signal. The feedback platform processes the digital signal to generate a physiological parameter, and is used as a multi-function driving recorder. An alarm is triggered or not by the feedback platform according to the physiological parameter.

The invention relates to an indoor positioning method based on WiFi, which comprises the following steps of: in an offline stage, acquiring fingerprint vectors of N reference point positions in an indoor positioning area, and storing the fingerprint information of the N reference points into a fingerprint database DB; roughly positioning at an online stage, namely determining a target floor; utilizing the K-means algorithm to carry out clustering analysis on the sub-fingerprint libraries DBjk of the corresponding floors, and further dividing positioning sub-regions; in the real-time positioning stage, firstly, carrying out AP selection, and then using a KNN classification algorithm for determining a sub-region where a target is located; and finally, finding out K nearest neighbors, and estimating the position (x, y) of the target in a weighted average mode. According to the method, for a large-range indoor positioning scene, the intensity information of all APs is reserved; for indoorfloor positioning, an SVM classifier is used, an encoder is added to a classifier model, the data dimension is reduced through introduction of the encoder, redundant information and noise interferenceare effectively reduced, and the classification precision is improved.

The invention provides a tunable all-optical microwave photon frequency conversion device without an external electric local oscillator. The tunable all-optical microwave photon frequency conversion device mainly comprises a narrow line width semiconductor laser unit, a non-linear optical loop circuit, a photoelectric detector and a low-pass filter; a saturated stimulated brillouin scattering effect is stimulated under the condition of not providing the external electric local oscillator and a circuit is selected to transmit by the non-linear optical loop circuit to generate anti-Stokes light for carrying out frequency conversion on a radio-frequency signal. Noise waves and noise inferences, caused by an optical local oscillator in traditional microwave photon frequency conversion are reduced. Meanwhile, the radio-frequency signal is subjected to high-order modulation by using a double-drive lithium niobate modulator, so that the tunable all-optical microwave photon frequency conversion is realized.

The invention discloses a prefabricated and light floor cover plate and an industrialized building house floor plate structure. The prefabricated and light floor cover plate comprises a facing layer, light packing layers where light packing blocks on the back face of the facing layer are arranged and bonding piece for fixing the facing layer and the light packing layers in a locating mode, steel reinforcement framework sheets are arranged between the light packing blocks, steel reinforcement meshes are laid at the backs of the light packing layers, and concrete structure layers are poured at the backs of the light packing layers and extend to gaps between the light packing layers to enable the facing layer, the steel reinforcement meshes, the steel reinforcement framework sheets and the light packing layers to be bonded to form a whole. The industrialized building house floor plate structure comprises a plurality of prefabricated and light floor cover plates transversely and fixedly arranged on a supporting beam, prefabricated lower sunk grooves, prefabricated balcony assemblies and cast-in-place concrete connecting pieces. The industrialized building house floor plate structure is simple in construction process and has the advantages of being light in weight, high in anti-shocking capacity, safe and the like.

A filter for a video stream is provided. The filter generates a filtered picture according to a current picture and its previous picture. A motion difference calculator accumulates differences between current picture values and previous picture values within a neighborhood of each pixel to provide a corresponding motion difference. A histogram counter performs histogram counting according to motion differences of the pixels. A filter value calculator provides a filter value for each pixel according to operations of the motion difference calculator and the histogram counter. A blender blends the current picture value and the previous picture value of each pixel according to weightings correlated to the filter value, and provides a filtered picture value for each pixel of the filtered picture.

A multi-chip module (MCM) for power supply circuitry integrates a controller, a driver and two power MOSFETs in a single chip to shorten the signal path between the controller and the driver. When applied to a voltage regulator, the MCM shortens the feedback paths between the current sensors and the controller, so as to reduce the loss of and interference with the feedback signals, thereby improving the efficiency of the voltage regulator and simplifying the PCB traces routing.

The invention discloses a C-peptide chemiluminescence immunodetection kit, a preparation method and a detection method therefor, belongs to the field of the immunoassay, and solves the problems of lowsensitivity, long reaction time, and high cost of an existing C-P detection method. The kit comprises magnetic particles coated by the streptavidin; the C peptide antibody labeled by the biotin; theC peptide antibody labeled by the acridinium ester; the wash buffer; the chemoluminescence pre-trigger solution; a calibrator; and a quality control product. The detection method is as follows: the C-peptide antigen in the sample is immunologically reacted with the C-peptide antibody labeled by the biotin and the C peptide antibody labeled by the acridinium ester to form a biotin-C peptide antibody-C peptide antigen-C peptide antibody-acridinium ester solvent; the magnetic particles coated by the streptavidin are combined with the biotin to form a magnetic bead-streptavidin-biotin-C peptide antibody-C peptide antigen-C-peptide antibody-acridinium ester complex; and the concentration of the C peptide is calculated by adding the washing buffer and the like. According to the C-peptide chemiluminescence immunodetection kit, the preparation method and the detection method therefor, the sensitivity is high, the specificity is good, the reaction time is short, and the cost is low.

The invention belongs to technical field of immunoassay, and particularly relates to a preparation method of a signal amplifying type quantum dot immune fluorescent probe and an application of the signal amplifying type quantum dot immune fluorescent probe. At first, According to the method, a microemulsion solvent evaporation method is adopted for preparing a quantum dot-polymer composite nanosphere with controllable grain size and good dispersibility by utilizing quantum dot and polymer solution; and an antibody is covalently coupled on the surface of the composite nanosphere to obtain the signal amplifying type quantum dot immune fluorescent probe. The invention provides an application of the quantum dot immune fluorescent probe in a fluorescence immunoassay method or a fluorescence immunoassay detection kit. Compared with traditional quantum dot immune fluorescent probe, the quantum dot immune fluorescent probe prepared by the method provided by the invention has stronger signals and good detection sensitivity.

A power converter module is disclosed, which is an all-digital module. The power converter module includes a reference voltage generation unit, a voltage loop control unit, a current loop control unit, an input voltage compensation unit, and a pulse width modulation generation unit, to transfer input power to stable output power for providing power to an external loading device through driving bridge switch unit with external driver. The voltage loop control unit and the current loop control unit contain a proportion-integral-differentiation controller for receiving signal related to voltage and current of loading device to form voltage control loop and current control loop. The pulse width modulation generation unit contains function of deciding necessary stop time to improve quality of output power and decrease the effect of input power and loading variation, and to provide stable sine-waveform output power to the external loading device.

An engine system is provided. The system comprises an engine, first and second compressors supplying air to the engine, a first compressor recirculation valve adjustable to two restriction levels, and a second compressor recirculation valve adjustable to three or more restriction levels. In this way, the first and second compressor recirculation valves may be controlled to avoid compressor surge while providing a sufficient amount of boost to meet power demands.