44results about How to "Suppress noise signal" patented technology

The purpose of the present invention is to provide a fibrous piezoelectric element which enables a large electric signal to be drawn out by stress produced by relatively small deformation. A piezoelectric element includes a braid composed of a conductive fiber and a piezoelectric fiber. In the braid, the conductive fiber is a core, and the piezoelectric fiber is a covering fiber that covers the periphery of the conductive fiber.

A discontinuous transmission line structure includes an input transmission line, an output transmission line, a plurality of meandered inductors, coupled in series between the input transmission line and the output transmission line, and a plurality of shunted to grounded capacitors, coupled between the meandered inductors. The discontinuous transmission line structure has a high inductance and a high capacitance, and can effectively reduce the size by increasing the transmission line load impedance and capacitance while the characteristic impedance of the transmission line structure remains.

An adaptive noise suppression system includes an input A/D converter, an analyzer, a filter, and a output D/A converter. The analyzer includes both feed-forward and feedback signal paths that allow it to compute a filtering coefficient, which is input to the filter. In these paths, feed-forward signal are processed by a signal to noise ratio estimator, a normalized coherence estimator, and a coherence mask. Also, feedback signals are processed by a auditory mask estimator. These two signal paths are coupled together via a noise suppression filter estimator. A method according to the present invention includes active signal processing to preserve speech-like signals and suppress incoherent noise signals. After a signal is processed in the feed-forward and feedback paths, the noise suppression filter estimator then outputs a filtering coefficient signal to the filter for filtering the noise out of the speech and noise digital signal.

The invention belongs to the technical field of biomedical detection, and relates to an imaging method for early breast tumor ultra wide band microwave detection. The method comprises the steps of performing time delay displacement processing to all detection signals of an antenna array, arranging amplitudes of all groups of signals emitted by an identical transmitting antenna and received by different receiving antennas into a matrix and solving a covariance matrix, performing weighting addition processing to all detection signals of all transmitting antennas, ensuring that weights corresponding to each group of signals are multiplied by the group of detection signals and are added to the group of detection signals, so as to obtain one group of weighting tumor signals, performing windowing processing to the weighting tumor signals, solving squares of all amplitudes in a tumor reflected signal interval and adding the squares, taking a result as a reflection energy value, solving an energy value of a point r, performing smoothing processing to the energy vale of the point r, so as to obtain the weighting energy value of the point r, and performing scanning imaging to a whole breast tissue zone, so as to obtain an energy value distribution diagram inside a breast. The method has good anti-noise capacity.

A method for the contactless transmission of at least one differential signal between a transmitter and a receiver given the existence of at least one common-mode noise signal, which has a low frequency in comparison with at least one signal to be transmitted, is provided. The suppression of at least one common-mode noise signal within the receiver a ground reference potential assigned to the receiver is separated into two ground reference potentials decoupled from one another. At least one common-mode noise signal may be suppressed by a filter unit at the input of a receive amplifier of the receiver.

The invention discloses a steel rail crack acoustic emission signal detection method based on an improved long-short-term memory network, which solves the problem of automatically filtering complex noise by training a noise model through an LSTM cyclic network in a complex noise environment of a railway site. The method mainly comprises the following steps of: respectively establishing a background noise time sequence model and a crack signal time sequence model for two consecutive times based on an LSTM network with the same structure, getting an upper envelope of error signals predicted by the background noise time sequence model and the crack signal time sequence model, subtracting to remove abnormal noise in the error signals, and finally detecting crack signal components contained innoisy signals. Compared with the prior art, the method has the advantages that (1) the cascaded time sequence model can be used for filtering abnormal noise with an unknown generation mechanism, (2) the noise model is automatically learned without any priori knowledge, and (3) the method can still effectively detect crack acoustic emission signals when the signals are completely submerged by the noise under the background of high-speed strong noise.

The invention provides a metal-surface wall thickness detector with probes distributed in a matrix mode and a measurement method thereof. The method is mainly used for detecting various kinds of corrosion, detecting most cracks and monitoring expansion of the corrosion and the cracks. The principle includes that the probes and electrodes are arranged into arrays in an area to be detected, and the same drive signals are exerted to the electrodes; and then through measurement of small changes of an electrical field of a metal structure, a measured voltage value is compared with an initially set measurement value, and accordingly metal loss or the creaks or pits or grooves caused by the corrosion and the like are detected. The detector can be applied to storage tanks or other metal buildings. The detector has high sensitivity and precision, can detect changes of corrosion reduction in an early stage, and therefore precautionary measures are optimized before corrosion damage occurs. The detector can be used in high-temperature working conditions, has no problems of temperature drift or precision reduction, has the advantages of being small in measurement error, high in sensitivity, strong in anti-interference capability, wide in application range, and the like, and can achieve remote on-line measurement.

A noise canceller of this invention includes a pickup antenna arranged in proximity to a noise signal generation source to extract a noise signal generated by the noise signal generation source, and a noise cancellation unit having a first input for receiving a television signal from a television signal receiving antenna and a second input for receiving the noise signal extracted by the pickup antenna. Herein, the noise cancellation unit removes a noise signal fed from the television signal receiving antenna. Thus, the noise canceller prevents degradation in television signal reception sensitivity due to the noise signal generated by the noise signal generation source.

The invention discloses an electromyographic signal noise reduction and classification method based on a generative adversarial network. The electromyographic signal noise reduction and classificationmethod comprises the steps of preprocessing electromyographic signals and then constructing an electromyographic signal noise reduction generative adversarial network model based on a WGAN; inputtingthe electromyographic signals into an electromyographic signal noise reduction generative adversarial network model for training, minimizing a JS distance between generative distribution and real data distribution, realizing mapping of noise-containing signals and the electromyographic signals, and outputting the electromyographic signals after noise reduction; converting the format of the electromyographic signals after noise reduction into a two-dimensional digital matrix, and extracting electromyographic signal features from the two-dimensional digital matrix by adopting a multi-scale convolution kernel convolution neural network model; important information is selected from two directions of a channel and a space according to an attention mechanism; and finally, the pooling data is tiled, and the electromyographic signals are classified by utilizing a Softmax classifier.

The invention relates to a metamaterial structure for enhancing Terahertz wave detection biological cell tissue signals. According to the metamaterial structure, a method of painting tissues of biological samples on a rectangular array formed by transmission-type double-frequency absorption structure units is adopted to ensure that when short pulse signals generated by a Terahertz wave generationdevice pass the samples and a metamaterial structure array, Terahertz signals and a vibration rotating frequency of specific substances in the biological tissues generate resonance absorption; the feature absorption frequency is just identical with an absorption frequency of a designed metamaterial double-frequency structure; and resonance amplification is carried out to ensure that the feature peak is more obvious and the interferences of noise signals are inhibited, so that the function of enhancing the Terahertz wave detection biological tissue cell effect is achieved. The metamaterial structure is capable of improving the feature absorption peak signals of key substances in to-be-detected biological samples and inhibiting the noise signals to ensure that the biological detection efficiency and correctness are greatly enhanced.

The invention discloses an underwater sonar system point cloud data noise reduction method, which comprises the following steps of (1) removing discrete data points without connected regions in pointcloud data based on an underwater acoustic signal reflection principle; (2) performing sidelobe effect suppression on the point cloud data; (3) removing noise based on correlation of continuous multi-frame point cloud data; (4) dynamically normalizing the point cloud data to process and remove noise data and background data; and (5) for the point cloud data of the three-dimensional data structure,physically meaningless point cloud data is removed according to the actual physical meaning of the three-dimensional point cloud data. Different noise reduction strategies are adopted for different noises respectively to achieve comprehensive noise reduction of the point data, and the noise reduction effect is improved.

The invention relates to a self-resonant array antenna for through-the-earth communication and an antenna unit. The array antenna comprises at least two antenna units; each antenna unit includes an alternating-current loop and an excitation loop; the alternating-current loop comprises a coil which is formed by at least one turn of electric conduction body and a capacitor module which is connected between two ends of the electric conduction body; the excitation loop comprises an electric conduction ring, wherein the electric conduction ring has an open end which is used for connecting a signal transmitting or receiving port of a communication system; the alternating-current loop and the excitation loop in the same antenna unit are in insulation and electromagnetic field coupling with each other; and the open ends of the excitation loops of the antenna units are in series connection, in parallel connection or in series-parallel connection. With the self-resonant array antenna of the invention adopted, the ability of the through-the-earth communication system to receive weak signals can be significantly improved, and therefore, the problem of short through-the-earth communication transmission distance can be solved.

An information recording system for recording information on an optical disc using a reference clock signal generated based on a push-pull signal including a wobble frequency component, the system includes an amplitude obtaining unit for obtaining an amplitude value of the push-pull signal, a threshold calculation unit for calculating a displacement threshold of the push-pull signal based on the amplitude value obtained by the amplitude obtaining unit, and a noise reduction unit for generating a corrected push-pull signal by correcting the push-pull signal such that a displacement exceeding the displacement threshold is reduced. The reference clock signal is generated based on the corrected push-pull signal generated by the noise reduction unit.

A digital image forming device and a digital image forming method used thereon are provided. The digital image forming device includes a light metering device, a processor, a frequency generator, a timing generator, and a light sensor. The light metering device detects a surrounding light value and transmits it to the processor. The processor generates an illumination parameter according to the surrounding light value and transmits it to the frequency generator. The frequency generator then generates a frequency based on the illumination parameter and transmits it to the timing generator. The timing generator generates an exposure time and controls the light sensor to detect the outside light and therefore form an image.

The invention discloses a sign pen emission circuit of an infrared electronic white board. The sign pen emission circuit of the infrared electronic white board comprises a first crystal oscillator, a second crystal oscillator, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a first infrared diode, a second infrared diode, a third infrared diode, a fourth infrared diode, a first audion, a second audion, a third audion, a fourth audion, a sign generation chip and an inductor. A writing operation is carried out through ultrasonic positioning and an infrared tracking technology, the sign pen emission circuit is strong in emission signs and stable in energy, can accurately write on the electronic white board, can avoid a misoperation brought by that a wrist enters an electronic infrared frame under a condition that the sign pen normally writes, and improves the stability, the sensitivity and the accuracy of electronic writing.

The embodiment of the invention discloses a method and device for restraining noise, an electronic device and a computer readable storage medium. The method includes the steps that in the process of communication, the working state of a telephone receiver of the electronic device is determined, if the telephone receiver is in an idle state, a first voice signal is collected through the telephone receiver, microphones of the electronic device are used for collecting a second voice signal, and the second voice signal is subjected to noise reduction processing based on the first voice signal. Compared with the prior art, the telephone receiver in the idle state is utilized for collecting the first voice signal, furthermore, the first voice signal is utilized for performing noise reduction onthe second voice signal collected through the microphones, the noise-reduction processes of the two microphones can be simulated, a noise signal in the second voice signal is effectively restrained, and communication quality is improved.

The invention discloses a wire TV system noise suppression device, and belongs to the field of the photo-electricity. The wire TV system noise suppression device comprises a DATA port for connecting acable modem, the DATA port is respectively connected with an uplink amplifier circuit and a first downlink amplifier through a duplex filter, the uplink amplifier circuit is connected with an uplinkoptical signal end through a first optical detector, the first downlink amplifier is connected with a downlink signal end through a second optical detector, and a low-pass filter is connected betweenthe uplink amplifier circuit and the duplex filter.

A power supply circuit includes a plurality of power amplifiers for amplifying radio frequency signals, an envelope tracker for supplying a variable voltage based on an envelope signal to the power amplifiers, a common line connected to an output side of the envelope tracker, and a plurality of branch lines branching from a tip of the common line and connected to the power amplifiers, respectively. On the branch lines, sub-inductors are provided, respectively. On the common line, a main inductor and a capacitor are provided.

The invention discloses a signal reading method and a signal reading device of a fingerprint imaging module, the fingerprint imaging module comprises a pixel array, the pixel array comprises a plurality of pixel groups, each pixel group comprises n pixel units, and n is an integer greater than 1; the micro lens array is located on the pixel array, and the micro lens array comprises a plurality of micro lenses; the micro lenses are in one-to-one correspondence with the pixel groups; the signal reading method comprises the steps that group signals of a pixel group are obtained according to unit signals of m pixel units in the pixel group, and m is larger than or equal to 1 and smaller than n; and obtaining a fingerprint image according to the group signals of the plurality of pixel groups. According to the technical scheme, the pixel units can be fully utilized while the pixel units are closely adjacent to improve the material area utilization rate, and image splicing is not needed.