50results about How to "Eliminate noise components" patented technology

Techniques to enhance voice signals in a dual microphone system are disclosed. According to one aspect of the present invention, there are at least two microphones that are positioned in a pre-configured array. Two audio signals x1(k) and x2(k) are received and coupled to an adjusting module that is provided to control the gain of each of the audio signals x1(k) and x2(k) to minimize signal differences between the two signals. A separation module is provided to receive matched audio signals x′1(k) and x′2(k) from the adjusting module. The separation module separates the audio signals x′1(k) and x′2(k) to obtain a first audio signal s(k) containing mainly the voice and a second audio signal n(k) containing mainly the noise. An adaptive filtering module is provided to eliminate the noise component in the audio signal s(k) to obtain an estimated voice signal e_s(k) with a higher S / N ratio. Furthermore, the adaptive filtering module can be also configured to suppress echo in the audio signal s(k) at same time. The voice signal e_s(k) may be further coupled to a single-channel voice enhancement module that is configured to eliminate any residual of the noise component in the voice signal e_s(k) according to the differences between the voice signal and the noise signal in time domain and frequency domain, whereby, the S / N ratio is further enhanced.

In a motion detection device that detects motion from two frames of a video signal, a pattern matching detector determines pattern similarity between pixel blocks centered on a pixel of interest in the two frames to detect pattern motion. An edge detector detects edge presence and direction in a vicinity of the pixel of interest. A frame difference detector generates a smoothed frame difference signal for the pixel of interest. The smoothing is carried out within appropriate extents selected according to the detected pattern motion and edge direction. A motion information corrector generates motion information for the pixel of interest from the frame difference signal. Appropriate selection of the smoothing extent reduces motion detection mistakes. The motion information is useful in motion adaptive video signal processing.

An apparatus and a method that achieve physical separation of sound sources by pointing directly a beam of coherent electromagnetic waves (i.e. laser). Analyzing the physical properties of a beam reflected from the vibrations generating sound source enable the reconstruction of the sound signal generated by the sound source, eliminating the noise component added to the original sound signal. In addition, the use of multiple electromagnetic waves beams or a beam that rapidly skips from one sound source to another allows the physical separation of these sound sources. Aiming each beam to a different sound source ensures the independence of the sound signals sources and therefore provides full sources separation.

The invention discloses a bearing fault diagnosis method and belongs to the field of mechanical faults. The method comprises the steps of denoising an acquired vibration signal with the flexible morphological filtering method to increase the signal to noise ratio, conducting LMD on the denoised vibration signal to obtain PF components, conducting spectral analysis on each PF component to obtain a spectrogram, and extracting fault character frequency from the obtained power spectrogram. The method has the advantages that the vibration signal is denoised with the flexible morphological filtering method so that noise in the vibration signal can be eliminated, fault frequency subjected to frequency spectrum correction is closer to actual fault character frequency than uncorrected fault frequency, and the accuracy of bearing fault diagnosis is improved.

An apparatus and a method that achieve physical separation of sound sources by pointing directly a beam of coherent electromagnetic waves (i.e. laser). Analyzing the physical properties of a beam reflected from the vibrations generating sound source enable the reconstruction of the sound signal generated by the sound source, eliminating the noise component added to the original sound signal. In addition, the use of multiple electromagnetic waves beams or a beam that rapidly skips from one sound source to another allows the physical separation of these sound sources. Aiming each beam to a different sound source ensures the independence of the sound signals sources and therefore provides full sources separation.

A solid-state imaging apparatus includes: a plurality of light-receiving elements which are arranged by rows and columns; a plurality of vertical transfer units each of which is arranged for a corresponding column of the light-receiving elements, and is operable to vertically transfer a plurality of signal packets and a dummy packet in a packets-mixing mode, the signal packet including charges read from the light-receiving elements, the dummy packet being a packet other than the signal packets, and N columns of the vertical transfer units forming one column group; a plurality of holding units which are arranged in final stages of the vertical transfer units in N columns except M columns in the column group, and each of which is operable to mix, hold, and vertically transfer charges of the signal packets and the dummy packet without depending on vertical transfer from upstream of the corresponding vertical transfer unit; a horizontal transfer unit operable to mix, hold, and horizontally transfer the charges transferred from the holding units or the vertical transfer units in the M columns in the column group; and a driving unit operable to drive the vertical transfer units, the holding units, and the horizontal transfer unit, wherein the driving unit is operable to drive, in the packets-mixing mode, the holding units and the horizontal transfer unit to generate a first mixed packet and a second mixed packet in the horizontal transfer unit, the first mixed packet includes: a plurality of signal packets belonging to a same row and neighbor columns of a same color; and a dummy packet belonging to a same column as the signal packets, and the second mixed packet includes no signal packet but a plurality of dummy packets in a same column as the signal packets included in the first mixed packets.

An improved heart rate monitor is provided that can detect and distinguish a heartbeat from an otherwise contaminated system with noise components potentially larger than the signal of interest. Embodiments of the inventive monitor have an amplification system that eliminates large noise components so as not to saturate the system during detection of a desired low amplitude signal. In embodiments the elimination of noise components is accomplished through wavelet decomposition, and the removal of undesired components including interference components during adaptive gain control (AGC), in addition to hunting algorithms which minimize the error with techniques such as neural network least mean squares type back propagation algorithms.

In a reflection type optical fiber electric current measurement apparatus, a standardization reference signal (Xr), which is defined by the intensity (Pr) of the optical reference signal transmitted through a partial transmission mirror by using a reflector (111B) provided in one end of a sensor fiber as the partial transmission mirror, is subtracted from a standardization detection signal (Xs), which is defined by the intensity (Ps) of the optical detection signal obtained from the light reflected at the partial transmission mirror. Thereby, it is possible to remove noise caused by fluctuation in the polarization state (B) as well as fluctuation in the luminescence intensity (A) of the light source.

An apparatus and a method that achieve physical separation of sound sources by pointing directly a beam of coherent electromagnetic waves (i.e. laser). Analyzing the physical properties of a beam reflected from the vibrations generating sound source enable the reconstruction of the sound signal generated by the sound source, eliminating the noise component added to the original sound signal. In addition, the use of multiple electromagnetic waves beams or a beam that rapidly skips from one sound source to another allows the physical separation of these sound sources. Aiming each beam to a different sound source ensures the independence of the sound signals sources and therefore provides full sources separation.

An apparatus and method for extracting an optical clock signal are provided. The method includes splitting a predetermined polarization component from an input optical signal, selecting frequency components for clock signal extraction from the predetermined polarization component and amplifying the selected frequency components, rotating the amplified frequency components by a predetermined angle and then reflecting them, amplifying the reflected frequency components and removing noise from the amplified frequency components using a Fabry-Perot filter, and obtaining a beat frequency component from the frequency components from which noise has been removed using the Fabry-Perot filter to extract a clock signal. Accordingly, influence of the pattern of the input optical signal is reduced and the apparatus and method are provided at low price.

The invention discloses a bearing early fault diagnosis method for multiple noise reduction processing. The method comprises the following steps: collecting a vibration signal of a bearing; carrying out short-time Fourier transform on the bearing vibration signal, and preliminarily judging whether the bearing has a fault or not; adopting wavelet packet transformation to decompose and reconstruct the bearing vibration signal, and carrying out preliminary denoising; decomposing, screening and reconstructing the wavelet packet reconstruction signal by using an ensemble empirical mode decomposition method; eliminating aliasing interference signals contained in the reconstructed signals, and performing multi-layer noise reduction on the bearing vibration signal; carrying out demodulation processing on the reconstructed signal after noise reduction, and extracting a bearing fault frequency; and comparing with a theoretically calculated fault frequency, and diagnosing to obtain a fault conclusion of the bearing. According to the method, a fault analysis mode combining wavelet packet transformation, an ensemble empirical mode decomposition method and autocorrelation calculation denoising is adopted, weak fault features are highlighted, bearing abnormity can be diagnosed and recognized as early as possible in the early fault stage of the bearing, and losses caused by equipment faults are avoided or reduced.

The respective ends of input wiring on a printed wiring board of a signal transmission circuit are connected to an input terminal section and a transistor. One terminal of a first capacitor and a first resistor are respectively connected to the input wiring. A leading-side transmission path from a connection point with the first capacitor to a connection point with the input terminal section is formed by only a conductive pattern. An intermediate transmission path from the connection point with the first capacitor to a connection point with the first resistor includes two or more through holes or via holes. The intermediate transmission path is placed near grounding wiring on the printed wiring board. When one terminal of a second capacitor is connected to the intermediate transmission path, a transmission path between the respective connection points with the two capacitors includes one or more through holes or via holes.

An apparatus and a method that achieve physical separation of sound sources by pointing directly a beam of coherent electromagnetic waves (i.e. laser). Analyzing the physical properties of a beam reflected from the vibrations generating sound source enable the reconstruction of the sound signal generated by the sound source, eliminating the noise component added to the original sound signal. In addition, the use of multiple electromagnetic waves beams or a beam that rapidly skips from one sound source to another allows the physical separation of these sound sources. Aiming each beam to a different sound source ensures the independence of the sound signals sources and therefore provides full sources separation.

An improved heart rate monitor is provided that can detect and distinguish a heartbeat from an otherwise contaminated system with noise components potentially larger than the signal of interest. Embodiments of the inventive monitor have an amplification system that eliminates large noise components so as not to saturate the system during detection of a desired low amplitude signal. In embodiments the elimination of noise components is accomplished through wavelet decomposition, and the removal of undesired components including interference components during adaptive gain control (AGC), in addition to hunting algorithms which minimize the error with techniques such as neural network least mean squares type back propagation algorithms.

A biological optical measuring apparatus includes a light source probe and a light receiving probe, one of which is provided with a pressure sensor to detect a contact pressure of a skin of a subject. Pairs of plural values of the contact pressure and light detection signals are previously recorded as calibration data, an estimated value of a false signal is derived from a detection value of the pressure sensor at primary measurement and the calibration data, and a measurement signal waveform in which a noise component due to a movement of the subject is removed is acquired by subtracting the estimated value from a light measurement signal.

The invention relates to an image noise reduction method of Contourlet transformation region, wherein it comprises: translating the input image with noise; using Contourlet transformation to decompose said image at multiple sizes and directions, and in the Contourlet transformation region, using minimum Bayesian risk function to evaluate the Contourlet region factor; then processing Contourlet inverse transformation and inversed translating to obtain the noise reduced image; then repeating aforementioned steps, linearly averaging the noise reduced image, to obtain last noise reduced image. The invention can improve the quality of noise reduced image, to provide full and accurate target and background information, to be used in optical imaging, target detecting and safety detecting systems.

The invention relates to the field of electronics, and discloses an isolated type power circuit, and a circuit and method for transmitting control signals of the isolated type power circuit. The method for transmitting control signals of the isolated type power circuit comprises the following steps that first ground wire noise components are obtained according to ground wire noise signals, the first ground wire noise components and the ground wire noise signals are in a predetermined ratio, first peak signals containing second ground wire noise components are generated according to first control signals of the isolated type power circuit, the first control signals contain the ground wire noise signals, the second ground wire noise components and the ground wire noise signals are in a predetermined ratio, second control signals are obtained according to the first peak signals and the first ground wire noise components, and the isolated type power circuit is controlled to be switched on and switched off according to the second control signals. By means of the technical scheme, the control signals used for controlling the isolated type power circuit are effectively transmitted, and the control accuracy of the isolated type power circuit is improved.

The invention discloses an integrated chip crack detection device and method. The device comprises a control unit, a sensing unit and an excitation unit which are mutually connected, wherein under control of the control unit, the excitation unit can generate a linear laser beam; the linear laser beam irradiates to the surface of a semiconductor chip to perform horizontal and longitudinal scan on the surface of the semiconductor chip; meanwhile, the linear laser beam can generate thermal wave at the position a required excitation line, thermal reaction of the thermal wave is caught by the sensing unit, and thermal reaction data is transmitted to the control unit. The integrated chip crack detection device disclosed by the invention achieves non-contact, no-damage and non-invasion detectionrecognition on cracks of the surface of an integrated chip, is not limited by chip materials, has a high detection efficiency, is suitable for online detection and further improves crack detection capacity and reliability and safety of the integrated chip.

The invention discloses an integrating circuit, and the integrating circuit comprises a first integrating module and a second integrating module. At a first mode, the first integrating module carried out the first integrating of an input current. At a second module, the second integrating module carries out the second integrating of the input current, and reduces the results of the first integrating. The invention also discloses an approaching detection chip, and the chip comprises a light-emitting diode, a photodiode, the integrating circuit, an analog-digital converter, and a control circuit. The chip can effectively eliminate the interference from ambient light, improves the detection precision, not only is suitable for a condition of short distance, but also is suitable for a condition of long distance.

A solid-state imaging apparatus includes: a plurality of light-receiving elements which are arranged by rows and columns; a plurality of vertical transfer units each of which is arranged for a corresponding column of the light-receiving elements, and is operable to vertically transfer a plurality of signal packets and a dummy packet in a packets-mixing mode, the signal packet including charges read from the light-receiving elements, the dummy packet being a packet other than the signal packets, and N columns of the vertical transfer units forming one column group; a plurality of holding units which are arranged in final stages of the vertical transfer units in N columns except M columns in the column group, and each of which is operable to mix, hold, and vertically transfer charges of the signal packets and the dummy packet without depending on vertical transfer from upstream of the corresponding vertical transfer unit; a horizontal transfer unit operable to mix, hold, and horizontally transfer the charges transferred from the holding units or the vertical transfer units in the M columns in the column group; and a driving unit operable to drive the vertical transfer units, the holding units, and the horizontal transfer unit, wherein the driving unit is operable to drive, in the packets-mixing mode, the holding units and the horizontal transfer unit to generate a first mixed packet and a second mixed packet in the horizontal transfer unit, the first mixed packet includes: a plurality of signal packets belonging to a same row and neighbor columns of a same color; and a dummy packet belonging to a same column as the signal packets, and the second mixed packet includes no signal packet but a plurality of dummy packets in a same column as the signal packets included in the first mixed packets.

A reproducing device including a light source that emits light for reproducing recorded information to a hologram recording medium subjected to recording of information by interference fringes of signal light and reference light, a light irradiating unit that generates the reference light for obtaining a reproduced image according to the recorded information and DC light having uniform intensity and phase, and irradiates the hologram recording medium with both the reference light and the DC light and with only the DC light, a light receiving unit that performs light-reception for the DC light and the reproduced image, and performs light-reception for the DC light, and a difference calculating unit that calculates a difference between an image signal obtained based on a light-reception result of the reproduced image and the DC light, and an image signal obtained based on a light-reception result of the DC light.

A cardiopulmonary coupling analysis method based on single lead ECG includes the steps of extracting an RR inter-phase sequence and an EDR signal from body surface single-lead ECG signals, eliminating the noise components of the EDR signal according to the relevance between the RR inter-phase sequence and the EDR signal by means of a self-adaptive filter with the RR inter-phase sequence as the reference input signal of the self-adaptive filter and the EDR signal as the ideal signal of the self-adaptive filter to obtain an enhanced type EDR signal, conducting experience pattern decomposing on the RR inter-phase sequence and the enhanced type EDR signal to obtain a plurality of intrinsic mode functions of the RR inter-phase sequence and a plurality of intrinsic mode functions of the enhanced type EDR signal, and selecting the intrinsic mode function, corresponding to a preset frequency band, of the RR inter-phase sequence and the intrinsic mode function, corresponding to the preset frequency band, of the enhanced type EDR signal for cardiopulmonary coupling analysis to obtain a coupling result.

To provide an optical transmission system which cancels out noise components and whose construction cost is lower than that of the conventional system, the present invention is an optical transmission system for transmitting an optical signal from an optical transmitter to an optical receiver and outputting an output electrical signal after a noise canceling process is performed. The optical receiver and transmitter are connected by one optical fiber, through which an optical signal is transmitted before being intensity-modulated. The optical receiver includes; a first processing unit receiving an optical signal, intensity-modulating the received optical signal, and splitting the intensity-modulated optical signal into two optical signals whose respective intensity-modulated components are in antiphase; first and second optical transmission fibers transmitting the two optical signals respectively; and a second processing unit converting the two optical signals into electrical signals respectively, and generating an output electrical signal by performing differential amplification.

In a motion detection device that detects motion from two frames of a video signal, a pattern matching detector determines pattern similarity between pixel blocks centered on a pixel of interest in the two frames to detect pattern motion. An edge detector detects edge presence and direction in a vicinity of the pixel of interest. A frame difference detector generates a smoothed frame difference signal for the pixel of interest. The smoothing is carried out within appropriate extents selected according to the detected pattern motion and edge direction. A motion information corrector generates motion information for the pixel of interest from the frame difference signal. Appropriate selection of the smoothing extent reduces motion detection mistakes. The motion information is useful in motion adaptive video signal processing.

To provide an optical transmission system which cancels out noise components and whose construction cost is lower than that of the conventional system, the present invention is an optical transmission system for transmitting an optical signal from an optical transmitter to an optical receiver and outputting an output electrical signal after a noise canceling process is performed. The optical receiver and transmitter are connected by one optical fiber, through which an optical signal is transmitted before being intensity-modulated. The optical receiver includes; a first processing unit receiving an optical signal, intensity-modulating the received optical signal, and splitting the intensity-modulated optical signal into two optical signals whose respective intensity-modulated components are in antiphase; first and second optical transmission fibers transmitting the two optical signals respectively; and a second processing unit converting the two optical signals into electrical signals respectively, and generating an output electrical signal by performing differential amplification.

In the present invention, by providing an apparatus for displaying a complex modulated holograph and including a light source configured to output light, a display configured to display the hologram by diffracting the output light through a plurality of pixels, and a processor configured to control the display to obtain complex hologram data corresponding to the hologram, and modulate the output light based on the complex hologram data and device information of the plurality of pixels, it is possible to modulate amplitude information and phase information of the light source into required values and display a complex hologram, and to remove a noise component of the hologram.