32results about How to "Fast noise" patented technology

A device comprising a voice activity detector for detecting voice activity in a speech signal using digital data formed on the basis of samples of an audio signal. The voice activity detector comprises a first element adapted to examine whether the signal has a highpass nature. The voice activity detector also comprises a second element adapted to examine the frequency spectrum of the signal. The voice activity detector is adapted to provide an indication of speech when the first element has determined that the signal has a highpass nature or the second element has determined that the signal does not have a flat frequency response.

A method and apparatus are provided for removing noise from a first digital representation of data images and noise images of a document, including digitally scanning the document so as to produce the first digital representation of all the images of the document, including the data images and the noise images. After de-skewing the image representation, objects are built from a reduced-resolution representation of the scanned representation. Objects identified as picture objects are included in a mask which is logically ANDed with the de-skewed representation of the scanned document. All objects are added to an object list and initially marked as noise. Objects identified as text objects or geometric objects are marked as data objects. Objects identified as picture objects are included in a mask which is logically ANDed with the de-skewed representation to eliminate all other objects. Objects marked as data objects are added to that representation to provide the de-skewed, de-speckled representation of the scanned document.

The present disclosure provides systems and methods to detect and reduce any high driveline torsional levels, such as due to the cylinder deactivation in variable displacement system engines or aggressive lock-up strategies for fuel efficiency, in automobile transmissions. The present disclosure utilizes a controller in an automobile to operate a computationally thrifty method for quickly detecting noise and vibration disturbances in the transmission. This quick detection enables fuel economic calibrations that aggressively reduce the disturbances by controlling slip in a launch device of the transmission. As problem disturbances arise, they are detected before occupants notice objectionable behavior. Once detected, the disturbances are reduced, such as by increasing launch device slip, which effectively intercepts the objectionable disturbances before they are transferred through the entire drivetrain. The present disclosure can also apply to launch devices in Dual Clutch Transmissions and Electronically-controlled Manual Transmissions.

A noise removal method and system using a change in activity pattern, in which it is recognized that noise components exist in different frequency bands and different filters for removing noise are stored according to each activity pattern, thereby optimally removing the noise components. A method of removing noise by using a change in an activity pattern includes: recognizing an activity pattern of the subject using an activity sensor; sensing a first bio signal corresponding to the activity pattern from the subject using an electric potential sensor; recognizing a noise generation pattern according to the activity pattern by analyzing a noise component for each section of the first bio signal; selecting filter information for each section according to the noise generation pattern; storing the filter information selected for each section in association with the activity pattern; and removing noise from a second bio signal sensed from the subject by applying the stored filter information.

A method and an apparatus are provided for eliminating multi-user interference in a multi-antenna system. In a BS, precoding vector information of at least one interfering user terminal interfering with a user terminal and information about a ratio of the transmission (TX) power of the user terminal to the total TX power of the BS are detected. A control signal including the detected information is transmitted to the user terminal.

A fundus camera using infrared light sources, which included an imaging optical path and an optical path for focusing and positioning and two optical paths share a common set of retina objective lens, and a computer-assisted method for retinal vessel segmentation in general and diabetic retinopathy (DR) image segmentation in particular. The method is primarily based on Multiscale Production of the Matched Filter (MPMF) scheme, which together the fundus camera, is useful for non-invasive diabetic retinopathy detection and monitoring.

Methods and apparatus for reducing or removing noise in digital images. Image noise reduction methods are described that may be applied to grayscale and color images, for example RGB images. An image noise reduction method may, before applying a noise filtering technique, transform the image values from linear space to flat noise space in which the noise is independent of the signal. An edge-preserving noise filtering technique may then be applied to the image in flat noise space. After noise filtering is applied, the image is transformed from flat noise space back to linear space. For color images, the flat noise space may be converted from linear color space to luminance-chrominance space before applying the noise filtering technique so that different filters can be applied to luminance and color channels. After applying the noise filtering technique, the image is converted back to linear color space.

The edge of an image is extracted, and edge information that includes the grade and the direction of the slope of the edge is obtained. The smoothing strength is calculated using the luminance of a pixel, and filter information is selected from the obtained edge information and the obtained smoothing strength. Then, digital data is smoothed by using the selected filter information. Since the filter information is set in advance, a fast smoothing process is implemented by selecting appropriate filter information. Further, the information for a smoothing range describes an elliptical shape when the slope is large, and the smoothing range is inclined in accordance with the direction of the slope. Therefore, noise near the edge can be thoroughly removed.

A noise removal method and system using a change in activity pattern, in which it is recognized that noise components exist in different frequency bands and different filters for removing noise are stored according to each activity pattern, thereby optimally removing the noise components. A method of removing noise by using a change in an activity pattern includes: recognizing an activity pattern of the subject using an activity sensor; sensing a first bio signal corresponding to the activity pattern from the subject using an electric potential sensor; recognizing a noise generation pattern according to the activity pattern by analyzing a noise component for each section of the first bio signal; selecting filter information for each section according to the noise generation pattern; storing the filter information selected for each section in association with the activity pattern; and removing noise from a second bio signal sensed from the subject by applying the stored filter information.

The invention provides a wind direction tracking wind power generation simulating device, which can solve the problem that the prior art lacks a wind power generation test device used for experimental teaching. The invention has the technical scheme that the wind direction tracking wind power generation simulating device comprises a wind power generation system and a wind source system which are controlled by a control system, wherein the wind power generation system comprises a fixed column, the column is provided with a cross beam which can rotate around the column, and the cross beam is provided with a generator set consisting of impellers and a generator; and the wind source system comprises a windmill and a fan, and the windmill drives the fan to rotate around the wind power generation system. The invention simulates the actual wind power generation device via a lab device, can detect the coming direction of the wind in real time, automatically regulates the direction of the windward side of the generator blade according to the existing wind direction so as to make the blade always face the coming direction of the wind, transfers the existing wind energy into electric energy to the maximum extent, and fills the gap in the market when being used as a teaching instrument.

A method of processing an image is provided. The method includes generating a first intermediate reconstructed image by applying a first iterated reconstruction algorithm to a tomographic image of a predetermined subject; generating a second intermediate reconstructed image by applying a second iterated reconstruction algorithm to a difference image between the first intermediate reconstructed image and the tomographic image; and generating an ultimately reconstructed image by composing the first and second intermediate reconstructed images.

A noise attenuation apparatus receives an audio signal comprising a desired and a noise signal component. Two codebooks (109, 111) comprise respectively desired signal candidates representing a possible desired signal component and noise signal contribution candidates representing possible noise contributions. A segmenter (103) segments the audio signal into time segments and for each time segment a noise attenuator (105) generates estimated signal candidates by for each of the desired signal candidates generating an estimated signal candidate as a combination of a scaled version of the desired signal candidate and a weighted combination of the noise signal contribution candidates. The noise attenuator (105) minimizes a cost function indicative of a difference between the estimated signal candidate and the audio signal in the time segment. A signal candidate is then determined for the time segment from the estimated signal candidates and the audio signal is noise compensated based on this signal candidate.

The present invention relates to a method of interconnection routing for preventing crosstalk. The method comprises the following steps. Providing an aggressor connection path as a first net. Providing a victim connection path according to the requirements of a second net. Determining a voltage ramp time of the aggressor connection path, a victim total length of the victim connection path, a coupled wire length between the aggressor connection path and the victim connection path, and an equivalent load corresponding to the victim connection path. Evaluating a noise metric according to the voltage ramp time, the victim total length, the coupled wire length and the equivalent load. Modifying the victim connection path to shorten the coupled wire length if the noise metric is greater than a pre-determined value. Finally designating the victim connection path as the second net if the noise metric is less than the pre-determined value.

A noise attenuation apparatus receives a first signal comprising a desired and a noise signal component. Two codebooks (109, 111) comprise respectively desired signal candidates and noise signal candidates representing possible desired and noise signal components respectively. A noise attenuator (105) generates estimated signal candidates by for each pair of desired and noise signal candidates generating an estimated signal candidate as a combination of the desired signal candidate and the noise signal candidate. A signal candidate is then determined from the estimated signal candidates and the first signal is noise compensated based on this signal candidate. A sensor signal representing a measurement of the desired source or the noise in the environment is used to reduce the number of candidates searched thereby substantially reducing complexity and computational resource usage. The noise attenuation may specifically be audio noise attenuation.

The present invention is an indirect analog synthesizer utilizing a direct analog fractional frequency multiplier approach. A fractional frequency multiplier produces a source that is injected into an offset loop of an indirect analog synthesizer. The fractional frequency multiplier utilizes a source and a combination of multipliers, dividers, and switches to generate and select among different frequencies. This direct analog approach eliminates step recovery diodes and sample loops from the frequency synthesizer. Switching speed of the direct analog portion is less than 100 nanoseconds. This increase in switching speed of the direct analog portion greatly improves the overall switching speed of the overall frequency synthesizer. Also, the fractional frequency multiplier has phase noise 20 dB better than a sampling loop. Better phase noise of the signal feeding the offset loop pushes optimum loop bandwidth of the offset loop higher, which also improves switching speed.

A fundus camera using infrared light sources, which included an imaging optical path and an optical path for focusing and positioning and two optical paths share a common set of retina objective lens, and a computer-assisted method for retinal vessel segmentation in general and diabetic retinopathy (DR) image segmentation in particular. The method is primarily based on Multiscale Production of the Matched Filter (MPMF) scheme, which together the fundus camera, is useful for non-invasive diabetic retinopathy detection and monitoring.

The invention relates to an energy-saving instantaneous variable-frequency electromagnetic water heater, which comprises a shell, a heating cylinder and a power supply control device. A water outlet and a water inlet communicated with a heat dissipation sheet are respectively arranged at the upper end and the lower end of the heating cylinder. A high-temperature resistance waterproof insulation coil electrically connected with the power supply control device is wound outside the heating cylinder. A spiral magnetic steel pipe is wound in the heating cylinder. A magnetic steel bar is arranged in the magnetic steel pipe. The energy-saving instantaneous variable-frequency electromagnetic water heater disclosed by the invention has the benefits that: the water heater has the advantages of high heat conversion efficiency, rapid heating speed, water and electricity separation, safety, reliability, low noise, no pollution, beautiful appearance, practicability, simple installation, convenience maintenance, steady working, long service life, low fault rate, maintenance-free, energy saving, emission reduction and low cost; the water heater can automatically work by setting temperatures according to user requirements; after being magnetized, water in the pipeline has the functions of removing and preventing scale, simultaneously, the water also has the good integrated functions of sterilizing, removing seaweeds, resisting corrosion, retarding corrosion and the like.

An optical phase scrambler is coupled to a laser source to randomly modulate the optical phase. Since the optical phase is continuously changing in a random fashion, at the output of an etalon interferometer formed in the optical path, the two or more components in the interference always have certain time delay between each other, resulting in a random phase different between each other. Therefore, after interference, the fringe amplitude varies randomly as well. Then at the receiver side, the fringe noise is greatly reduced after averaging over time.

A method and an apparatus are provided for eliminating multi-user interference in a multi-antenna system. In a BS, precoding vector information of at least one interfering user terminal interfering with a user terminal and information about a ratio of the transmission (TX) power of the user terminal to the total TX power of the BS are detected. A control signal including the detected information is transmitted to the user terminal.

A grounding sheet having a body and elastic conduction sheets is provided. The elastic conduction sheet has a first elastic sheet and a second elastic sheet, each of the first elastic sheet and the second elastic sheet a closed terminal, a floating arm, a connection arm, at least one free terminal and at least one end terminal, wherein the closed terminal is connected to the body of the grounding sheet, the connection arm is connected to the closed terminal and the floating arm, the free terminal is connected to the floating arm, and the end terminal is connected to the free terminal and corresponds to the floating arm. The first elastic sheet has the merely one free terminal, and the second elastic sheet has the two free terminals and the two end terminals. The connector using the same can quickly conduct noise outside.

A control method and device for braking, stopping and starting of a vehicle, the vehicle and a readable storage medium are characterized in that a brake master cylinder pressure threshold value in a servicing state is preset on different ramps, timely correction is carried out in the parking process, a user can enter an idle neutral gear with a braking force as low as possible in different ramp scenes, and the user can stop the vehicle at the idle neutral gear at the braking force as low as possible. The condition that the vehicle cannot enter the idle neutral position after braking and parking under the working conditions of flat roads, small ramps and the like is avoided; by actively adjusting the pressure of the brake master cylinder after entering the idle neutral position, the purposes of improving the driving comfort, improving the acceleration response and enhancing the use experience of a user are achieved.

The present invention is a piston-wheel type high-speed labor-saving steam engine without turbine and crankshaft, which completely changes the structure of the existing steam engine. It includes a shell, an annular cylinder, a piston, a lever, a sealing ring, a sealing cover, a ring gear, Lever gears, connecting gears, main shaft gears, bearings, air inlets, exhaust ports, steam pipes, valves, computers, wires, instruments and meters, and electronic switches, computer control during startup, steam enters from the air inlet, and exhaust gas from the exhaust Outlet, when the valve is opened for air intake, the steam pushes the piston, the piston pushes the lever, the lever pushes the seal ring and the ring gear to rotate, the ring gear rotates to drive the lever gear to rotate, and the lever gear rotates to drive the connecting gear and the main shaft gear to run together at high speed. Novel, strong practicability, simpler structure, more scientific, easier to manufacture, lower energy consumption, greater power, faster speed, less noise, lower cost, wide application, and huge commercial development value. The world's most labor-saving and energy-saving, the most advanced high-speed labor-saving steam engine.

A noise attenuation apparatus receives an audio signal comprising a desired and a noise signal component. Two codebooks (109, 111) comprise respectively desired signal candidates representing a possible desired signal component and noise signal contribution candidates representing possible noise contributions. A segmenter (103) segments the audio signal into time segments and for each time segment a noise attenuator (105) generates estimated signal candidates by for each of the desired signal candidates generating an estimated signal candidate as a combination of a scaled version of the desired signal candidate and a weighted combination of the noise signal contribution candidates. The noise attenuator (105) minimizes a cost function indicative of a difference between the estimated signal candidate and the audio signal in the time segment. A signal candidate is then determined for the time segment from the estimated signal candidates and the audio signal is noise compensated based on this signal candidate.

The invention belongs to the field of three-dimensional microwave imaging and provides a microwave imaging-based sandstone aggregate nondestructive testing method. Firstly, sandstone aggregate is placed on a workbench type assembly line; detection equipment with an ''n''-shaped side section and a limited caliber is adopted to detect sandstone aggregate passing through the detection equipment so asto acquire scattering field data; and then the obtained scattering field data is used to realize three-dimensional electromagnetic inverse scattering imaging based on an SOM method to reconstruct a shape and a dielectric constant value of the sandstone aggregate so as to detect whether the sandstone aggregate reaches a standard required by a building or not. In the invention, a unknown scattereris detected by adopting the limited caliber with the ''n''-shaped side section so that actual requirements are met better; the detection process is more convenient and automatic due to a design of anassembly line workbench; and a three-dimensional electromagnetic imaging technology is realized based on an SOM method with two significant advantages of rapid convergence and noise resistance so thatthe method can rapidly and accurately obtain a data result.

The invention is suitable for the technical field of railway vehicle noise calculation, and provides a railway vehicle noise calculation method and device and terminal device.The method comprises the steps that according to a vehicle overall drawing, a sound source position and an in-vehicle noise evaluation point, a vehicle body is subjected to region division in the vehicle running direction, and a plurality of independent calculation sub-regions are obtained; according to the incident sound energy of each independent calculation sub-region and the coupling loss factor between the adjacent independent calculation sub-regions, respectively calculating the sound energy of each independent calculation sub-region; and calculating the sound pressure level of each independent calculation sub-region according to the sound energy of each independent calculation sub-region. According to the method, a plurality of independent calculation sub-regions are obtained according to an overall drawing of a vehicle, and the sound pressure level of each independent calculation sub-region is calculated. A detailed design drawing of a vehicle is not needed, and noise calculation and evaluation can be quickly carried out in the early-stage bidding and conceptual design stages of a project.

A noise attenuation apparatus receives a first signal comprising a desired and a noise signal component. Two codebooks (109, 111) comprise respectively desired signal candidates and noise signal candidates representing possible desired and noise signal components respectively. A noise attenuator (105) generates estimated signal candidates by for each pair of desired and noise signal candidates generating an estimated signal candidate as a combination of the desired signal candidate and the noise signal candidate. A signal candidate is then determined from the estimated signal candidates and the first signal is noise compensated based on this signal candidate. A sensor signal representing a measurement of the desired source or the noise in the environment is used to reduce the number of candidates searched thereby substantially reducing complexity and computational resource usage. The noise attenuation may specifically be audio noise attenuation.

The invention relates to the technical field of medical treatment and public health, and provides a method and device for conveniently and efficiently identifying cerebrospinal fluid in intraspinal anesthesia operation, and the method comprises the following steps: 1, understanding the spectroscopy characteristics of cerebrospinal fluid, local anesthesia drugs and normal saline; 2, exploring ATR-FTIR spectral characteristic discrimination indexes of cerebrospinal fluid, local anesthesia drugs and normal saline, and establishing a diagnostic standard; 3, further expanding and constructing a characteristic atlas database; and 4, carrying out Fourier transform infrared spectroscopic analysis on a liquid sample obtained in the intraspinal anesthesia operation by adopting a handheld portable infrared spectrometer, obtaining a corresponding liquid sample atlas according to relative vibration and molecular rotation information among atoms in molecules of the liquid sample, and comparing the liquid sample atlas with the characteristic atlas database to obtain a comparison result, and judging whether the liquid sample is cerebrospinal fluid, local anesthesia medicine or normal saline according to the comparison result through an ATR-FTIR spectrum judgment standard.