97results about How to "Reduce noise components" patented technology

The present invention provides a solution to the needs described above through a method and apparatus for reducing echo and noise. The apparatus includes a microphone array for receiving and audio signal, the audio signal including a voice signal component and a noise signal component. The apparatus further includes a voice processing path having an input coupled to the microphone array and a noise processing path having an input coupled to the microphone array. The voice processing path is adapted to detect voice signals and the noise processing path is adapted to detect noise signals. A first echo controller is coupled to the voice processing path and a second echo controller is coupled to the noise processing path. A noise reducer is coupled to the output of the first echo controller and second echo controller.

The invention is a method and apparatus to extend the signal range of a digital image beyond the nominal sensor or data format range. The method and apparatus automatically acquires a scaled series of source data, applies noise reduction to the source data, and constructs a scaled composite with usable signal ranges greater than that of the individual data sources. Applied to digital images, the invention permits presentation and analysis of all signals from a subject in a single composite or an image resulting from the method and apparatus of the present invention. The present invention overcomes two defects in prior art systems: increased noise in the resultant composite image arising from rescaling of component images and dependence on evaluating image content to determine image scaling. Because this invention can be automated, it can be applied in numerous fields requiring high throughput.

The invention discloses methods and devices for denoising in video coding and decoding. The method for denoising in video coding comprises the following steps of: in the process of video coding, performing full pixel denoising treatment on a reconstructed picture of the current coding picture; and taking the denoised and reconstructed picture as a reference picture of other coding pictures. The method for denoising in video decoding comprises the following steps of: in the process of video decoding, performing the full pixel denoising treatment on the reconstructed picture of the current decoding picture; and taking the denoised reconstructed picture as the reference picture of other decoding pictures and the final reconstructed picture. The technical scheme disclosed by invention can suppress noises in the acquired video pictures, and improve the precision of a block matching result in the process of motion estimation.

The application discloses a switch cabinet fault feature selection method and apparatus. The method comprises: based on a sorting principle of importance degree of fault features, performing sorting on N fault features of a fault feature set to obtain to-be-selected fault feature subsets; based on mRMR criterions, performing screening on the to-be-selected fault feature subsets with an increment search method; and calculating the classification accuracy of each candidate fault feature subset in N candidate fault feature subsets obtained after screening, and determining the candidate fault feature subset with highest classification accuracy as an optimal candidate fault feature subset. According to the switch cabinet fault feature selection method and apparatus, the fault features in the fault feature set are sorted in advance, so that the dimension reduction of the fault features is realized; and then the screening is performed based on the mRNR criterions, so that noise components in a fault feature sample are effectively reduced, the feature dimensions are further reduced, the screening effect is improved, and the degree of matching between the subsequently obtained optimal fault feature subset and an actual fault reason is increased.

The invention relates to a rolling bearing fault diagnosis method based on dual-tree complex wavelet pack manifold domain noise reduction. The rolling bearing fault diagnosis method based on the dual-tree complex wavelet pack manifold domain noise reduction comprises steps of using an accelerated speed sensor to collect a vibration signal of the rolling bearing, performing dual-tree complex wavelet pack decomposition on the vibration signal, maintaining wavelet pack coefficients of first two nodes, performing threshold noise reduction on wavelet coefficients of the rest nodes, performing single branch reconstruction on the wavelet pack coefficient of each node to perform a high dimensional signal space, using a t distribution random neighbor embedding method to extract low a dimensional manifold, performing inverse reconstruction on the low-dimensional manifold to obtain a high-dimensional space main manifold, obtaining a signal after noise reduction, performing Hilbert envelope demodulation on the signal after noise reduction to obtain an envelope frequency spectrum of the vibration signal, and realizing fault diagnosis of the rolling bearing according to an inner ring fault characteristic frequency and an outer ring fault characteristic frequency of the rolling bearing, a rolling body fault characteristic frequency and a retainer fault characteristic frequency.

A sensor device for detecting a substance contained in a fluid comprises first and second photonic crystal regions, first and second flow channels, an optical waveguide connected to the first and second photonic crystal regions and an optical detector for detecting the lights transmitted through the first photonic crystal region and the waveguide and transmitted through or reflected by the second photonic crystal region.

An accelerometer based on an optical displacement sensor is disclosed. An embodiment of the present invention directs a light beam toward an optically resonant cavity and detects both the reflected and transmitted optical beams that result from interaction with the optically resonant cavity. The optically resonant cavity has a cavity length that is based on the position of a proof mass that moves in response to an acceleration.

The invention discloses a steady self-adaptive beamforming technology based on information source number constraint and used for reconstructing covariance matrix and accurately estimating expected signal steering vector. The method comprises the following steps: firstly estimating interference source number, expected signal angle region, interference angle region and noise angle region, estimatingnoise average power in the noise angle region to acquire a noise covariance matrix; estimating accurate interference power through the noise average power in the interference region, reconstructing the interference covariance matrix, and modifying the reconstructed interference covariance matrix according to the interference source number constraint to acquire the interference and noise covariance matrix; estimating the accurate expected signal power through the noise average power in the expected signal angle region, reconstructing the expected signal covariance matrix, decomposing the feature of the expected signal covariance matrix to acquire the steering vector of the expected signal, thereby acquiring the weight vector of the steady self-adaptive beam-former, and forming the output of the steady self-adaptive beam-former.

A method, a device, and a control unit are for controlling at least one aggregate in a vehicle, the noise caused by the aggregate and / or at least one variable representing this noise being ascertained. The passenger compartment noises in the vehicle are ascertained, or at least one variable representing these is ascertained. The noise caused by the aggregate and / or the variable representing this is correlated with the passenger compartment noises and / or the variable representing these. As a function of that, the control or a control signal for the aggregate is generated and / or adapted.

The present invention provides an optical signal noise suppressor and an optical signal noise suppressing method that can decrease noise components to be superimposed on signal light. The optical signal noise suppressor is a device for suppressing noise caused by SBS which is generated when a signal light propagates from a first end side to a second end side of an optical fiber, and comprises a light source section, an optical attenuator, an optical circulator and an optical isolator. A counter light, outputted from the light source section and passing through the optical attenuator, is guided into the optical fiber via the optical circulator. The counter light guided into the optical fiber is interrupted by the optical isolator, and does not reach the signal light source section. The counter light has the same optical frequency components as the SBS light generated by the propagation of the signal light, and propagates in the optical fiber in an opposite direction of the propagation direction of the signal light.

A sensor device for detecting a substance contained in a fluid comprises first and second photonic crystal regions, first and second flow channels, an optical waveguide connected to the first and second photonic crystal regions and an optical detector for detecting the lights transmitted through the first photonic crystal region and the waveguide and transmitted through or reflected by the second photonic crystal region.

In frequency signals obtained by converting input audio signals from time-domain signals to frequency-domain signals, a level control value setting unit 5 establishes a level control value for reducing the levels of spectrums at a noise-components level. A level control value smoothing unit 6 carries out a smoothing process of smoothing the level control value established by the level control value setting unit 5 temporally. A spectral adjustment unit 8 multiplies the level control value after the smoothing process by the frequency signals, performing a level control.

An optical displacement sensor is disclosed that provides a high signal-to-noise ratio output signal without some of the disadvantages for doing so in the prior art. An embodiment of the present invention directs a light beam toward a Fabry-Perot interferometer and detects both the reflected and transmitted optical beams that result from interaction with the Fabry-Perot interferometer. Signal processing techniques are applied to signals based on both the reflected and transmitted beams, resulting in higher signal strength and / or reduced noise in the resulting output signal.

An optical semiconductor device includes a semiconductor substrate; a light receiving element formed on the semiconductor substrate; a light absorbing element formed on the semiconductor substrate and located adjacent to the light receiving element; and a semiconductor element formed on the semiconductor substrate and used for signal processing. The light absorbing element includes a fifth semiconductor layer, and a light absorption region in the light receiving element has a different structure from a light absorption region in the light absorbing element.

A perpendicular magnetic recording medium is disclosed that is characterized by a lowered noise component and improved thermal stability. The method for making the recording medium includes the serial steps of forming a soft magnetic back-lining layer on a non-magnetic substrate, forming an intermediate layer on the soft magnetic back-lining layer, forming a magnetic recording layer on the intermediate layer, and forming a protective film and then a liquid lubricating layer on the magnetic recording layer. Thermal treatment is executed after the formation of the magnetic recording layer and before the formation of the protective film, or after the formation of the protective film and before the formation of the liquid lubricating layer. The thermal-processing steps are is executed in a vacuum higher than about 0.1 Pa and in a thermal environment within a range from about 200° C. to about 250° C. for a period of less than about 60 seconds.

A video decoding apparatus that adaptively controls post-filter filter parameters according to a characteristic quantity of priority-coded data priority-coded for individual areas classified by importance within a moving image, and improves the subjective image quality of an overall screen. In a video decoding apparatus 200, a filter parameter calculation section 213 calculates filter parameters that control the noise elimination intensity of a post-filter processing section 215 based on shift values of individual small areas set in a stepwise shift map in which the shift value decreases stepwise from an important area to the peripheral area within a screen in the video coding apparatus, and a post-filter processing section 215 performs post-filter processing of a reconstructed image by applying the calculated filter parameters.

A method for reducing noise in a tomographic image, includes: acquiring phase information of a noise component signal, the signal being provided as a signal corresponding to a noise component of the tomographic image and included in a spectrum interference signal output from a detector of a swept source optical coherence tomography device; acquiring a tomographic image in response to a spectrum interference signal with a corrected phase deviation based on the acquired phase information; and reducing the noise component of this tomographic image.

A noise removal circuit of the present invention comprises a 180-degree odd multiple shifting section for outputting a 180-degree shifted signal that is phase-shifted from an input signal by an odd multiple of 180 degrees and difference output section for outputting a difference between the input signal and the 180-degree shifted signal. The noise removal circuit comprises a 360-degree shifting section for outputting a 360-degree shifted signal that is phase-shifted from an input signal by an integral multiple of 360 degrees and sum output section for outputting a sum of the input signal and the 360-degree shifted signal.

The present invention provides an X-ray image detector (1) which can reduce the size of a whole apparatus associated with an X-ray imaging tube, reduce noise components of an output X-ray image even if an incident X-ray is very weak, and provide a distortion-free visible image or electric image. The X-ray image detector (1) comprises a vacuum container having an input fluorescent screen outputting fluorescent light, a photoelectric screen converting the fluorescent light which is output from the input fluorescent screen to a photoelectron, and an output fluorescent screen outputting a visible light image with the obtained electron, a plurality of image pick-up elements (3) arranged such that partially overlapped areas are outside an image taking area and taking the visible light image in a divided way, image processing circuits (4) so arranged as to correspond to the image pick-up elements and trimming a taken video signal, an output image processing circuit (6) obtaining a composed image and a display device (5) displaying it as one signal.

The invention discloses a chaos coordinating communication method based on a UKF (unscented Kalman filter). On the basis of a chaos difference phase shift keying (PSK) communication system, a UKF algorithm is applied to estimate a carrier signal, and the estimated carrier signal is taken as a reference signal and a subsequently transmitted user information signal after being demodulated. According to the UKF algorithm, a noise component in the reference signal is decreased, bit error property is effectively improved, additionally, according to a changing speed of a channel, a frame number ratio of an appropriate reference signal to the user information signal is selected, and the frame number of required transmitting signals is reduced.

The invention provides a hydrogen sulfide detection device and method which are used for improving the detection sensitivity and the response speed of the detection device. The hydrogen sulfide detection method comprises the steps that firstly, outside a to-be-detected environment, a power supply, a field-effect tube type sensor connected with a resistor and a signal conditioning unit are used forobtaining a digital voltage initial value signal, and the digital voltage initial value signal is stored by a controller; secondly, in the to-be-detected environment, the power supply, the field-effect tube type sensor connected with the resistor and the signal conditioning unit are used for obtaining a digital voltage signal, and the digital voltage signal is output; thirdly, the controller calculates the hydrogen sulfide concentration by utilizing the digital voltage initial value signal, the digital voltage signal, the temperature of the to-be-detected environment and the pressure intensity; finally, the controller judges whether the hydrogen sulfide concentration is smaller than a reference concentration or not, if yes, the controller controls a displayer to display the hydrogen sulfide concentration, otherwise, the controller controls the display to display the hydrogen sulfide concentration and controls an alarm device to give an alarm at the same time. The device is relativelyhigh in sensitivity and relatively high in response speed and can be used for detecting the concentration of hydrogen sulfide gas.

A hologram recording apparatus, a hologram recording method and a hologram recording medium reduce noise components generated by a phase modulation type spatial light modulator, thus permitting improved integrity of data to be achieved. A light beam whose diffraction state has been controlled by a diffraction control element is condensed on a hologram recording medium. With this arrangement, a predetermined diffracted light component is removed from a diffracted light beam emergent from the diffraction control element when recording information, which is based on the diffraction state controlled by the diffraction control element, in a hologram recording medium. Thus, noise components when information is recorded can be reduced.

The invention relates to an amplifier for amplifying an input signal to generate an output current, comprising an impedance matching network for receiving the input signal to perform impedance matching; a first resistor for receiving the input signal to generate the matched signal; a first transistor having a channel thermal noise to establish a first noise voltage; a second resistor for receiving the channel thermal noise to establish a second noise voltage; and a transconductance circuit, comprising a first transconductance circuit which has a first transconductance coefficient and receives the first noise voltage to generate a first noise current; a second transconductance circuit which has a second transconductance coefficient and receives the second noise voltage to generate a second noise current such that the first and the second noise currents are counteracted with each other to reduce the noises in the output current. In contrast to the prior art, the invention can efficiently reduce the noises in the output current.

Disclosed is an annular-beam coupling system enabling reduction of noise generated from a core of a double-clad fiber. The disclosed annular-beam coupling system comprises: a fiber for transmitting light of a light source; a collimator for receiving input of the light output from the fiber and forming a spherical parallel beam; an annular-beam generation portion for converting the parallel beam into an annular beam; and a double-clad fiber having the annular beam coupled in a cladding region.

Image data (D0) which includes a plurality of object unit image data arranged in time series, such as field images, is supplied from an image source. The object unit image data subjected to the smoothing process is divided into blocks of a predetermined size. Then, a difference between the object unit image data and preceding unit image data which is immediately before the object unit image data, and a difference between the object unit image data and subsequent unit image data which is immediately after the object unit image data are determined for a plurality of blocks, based on a pixel value. The object unit image data is smoothed with one of the preceding unit image data and the subsequent unit image data having a smaller difference.

The present invention provides a receive coil unit (140) comprising a receive coil array (142) for use in a magnetic resonance imaging system (110) with multiple antenna units (144) sensitive to magnetic resonance signals, i.e. antenna units (144) sensitive to B-field signals, whereby each antenna unit (144) comprises a coil element (146) sensitive to B-field signals, and each antenna unit (144) comprises an E-field antenna (148) sensitive to E-field signals. The present invention also provides a magnetic resonance imaging system (110) comprising a receive coil unit (140) with a receive coil array (142) having multiple antenna units (144) sensitive to magnetic resonance signals, i.e. antenna units (144) sensitive to B-field signals, whereby the receive coil unit (140) is provided as a receive coil unit (140) as specified above. Still further, the present invention provides a method for magnetic resonance imaging comprising the steps of providing a receive coil unit (140) comprising a receive coil array (142) for use in a magnetic resonance imaging system (110) with multiple antenna units (144) sensitive to magnetic resonance signals, i.e. antenna units (144) sensitive to B-field signals, whereby each antenna unit (144) comprises a coil element (146) sensitive to B-field signals, and each antenna unit (144) comprises an E-field antenna (148) sensitive to E-field signals, and performing de-noising of the B-field signals received from the coil elements (146) of the receive coil unit (140) by filtering noise signals, as received from the E-field antenna (148), from the B-field signals.