33results about How to "Reduce unwanted noise" patented technology

There is provided an improved TIG welder comprising a power source for performing an AC TIG welding process across an electrode and a workpiece with a controller for creating an AC waveform. The controller having a synergic input device with an input for receiving a signal level representing a desired set current for the welding process and an output signal determining an aspect of the waveform and representing a non-linear relationship between peak positive current and peak negative current for certain desired set welding currents.

A method and apparatus are described which reduce the presence of an unwanted signal. According to one embodiment, a first signal is provided from a desired location that includes an unwanted signal while a second signal is provided from an alternate location (e.g., one where the unwanted signal is less of a proportion of the total signal). The first and alternate signals are provided to respective signal processors. A level for a selected frequency band of the first and alternate signals is adjusted so that an increase in one results in a decrease in the other. Doing so allows the frequency band that includes the unwanted signal to be reduced in the desired first signal and filled in with a similar frequency band from the alternate signal.

An electric power assisted steering system comprises a motor connected to a portion of a steering mechanism through a worm carried by a worm shaft and a wheel carried by an output shaft operatively coupled to the steering mechanism. The shaft is supported in at least one bearing which has some internal clearances and supports the worm shaft in such a manner that it is free to pivot through an angle in planes which include its own axis due to a degree of axial free play of the first bearing assembly. The bearing assembly comprises an inner race having a groove, an outer race having a groove, and a plurality of ball bearings located between the inner and outer races, and in which the outer race groove is not round when in its position of use such that the ball bearings permit a greater freedom of movement of the inner race relative to the outer race in a first radial direction than in a second radial direction that is orthogonal to the first direction. Tensile or compressive forces may be applied to the bearing assembly to cause the part of the assembly to become not round.

The invention uses tubes for the reduction of radiated duct noise. The tubes may be used to attenuate narrow band noise by diverting a portion of the acoustic energy through the tubes back into the duct. Upon reintroducing the diverted flow out of phase with the primary flow, acoustic cancellation is achieved. The frequency at which this occurs is dependent on the difference in the path lengths through the tubes and the separation distance—the distance separating the inlet and outlet of the tube. This invention can be used over varying frequency ranges by using an arrangement of flexible, constant length tubes. The effective frequency range is tailored by varying the separation distance and also allows the varying the angular arrangement of the tubes for more effective attenuation of spinning modes having varying propagation angle.

Apparatus for monitoring a fetal heart-beat is able to extract one or more fetal electrocardiograms (fECGs) from a composite signal detected at the abdomen of a pregnant woman. The apparatus includes specific low-noise components: a plurality of low-noise electrodes (1-3, R) for placement on the abdomen during pregnancy and a low-noise signal recording and processing means (34). Screened leads are also used, as required. Signals indicative of voltages developed between each abdominal electrode (1-3) and a reference electrode (R) are recorded in a plurality of signal channels. Data within each channel is digitised and processed in order to generate a plurality of separated source signals, at least one of which relates to the fECG of a single fetus. Single-channel fECGs may be reconstructed using the source signals identified as belonging to the same fetus.

A digital electronic stethoscope includes an acoustic sensor assembly that includes a body sensor portion and an ambient sensor portion, the body sensor portion being configured to make acoustically coupled contact with a subject while the ambient sensor portion is configured to face away from the body sensor portion so as to capture environmental noise proximate the body sensor portion; a signal processor and data storage system configured to communicate with the acoustic sensor assembly so as to receive detection signals therefrom, the detection signals including an auscultation signal comprising body target sound and a noise signal; and an output device configured to communicate with the signal processor and data storage system to provide at least one of an output signal or information derived from the output signal. The signal processor and data storage system includes a noise reduction system that removes both stationary noise and non-stationary noise from the detection signal to provide a clean auscultation signal substantially free of distortions. The signal processor and data storage system further includes an auscultation sound classification system configured to receive the clean auscultation signal and provide a classification thereof as at least one of a normal breath sound or an abnormal breath sound.

A method, system, and software are disclosed for improving the quality of a signal. A base signal is recursively decomposed and modified for a desired number of pyramid levels. At each level, the decomposed signal from the previous level is modified to improve one or more signal components or characteristics. The modified signal from a given level is then decomposed for the next level of the pyramidal decomposition for each pyramid level. Starting at the second to last level of the pyramidal decomposition, the improved signal of the last pyramid level is recomposed and then combined with one or more signals from the current pyramid level, resulting in an improved signal for the current level. The recomposition and combination of the improved signal of the previous level occurs for each level until the top, or level 0, of the pyramidal decomposition is reached. The improved base signal may or may not be combined with the original base signal, depending on the desired outcome. The present invention finds particular application in photography and digital film processing, whereby the illustrated method may be used to improve image quality.

An electric wheel has a transmission assembly and wheel speed detecting device mounted inside a chamber formed by two assembled sidewalls. A rubber tire surrounds the peripheries of the assembled sidewalls. Two hollow forks are respectively attached to external surfaces of the two sidewalls. A transmission ring is formed on an inner surface of one of the sidewalls and driven by the transmission assembly to rotate. As a result, the electric wheel is driven by the transmission ring and has rotating movements.

The invention provides an audio power amplifier and an adjusting method thereof. According to the audio power amplifier, clipping inhibition of the audio power amplifier is realized by adjusting self zero-frequency gain without the assistance of peripheral devices, so that unnecessary noise caused by the inducing of the peripheral devices is decreased, cost of peripheral circuits is decreased, and the complexity of design is decreased as well; furthermore, according to the audio power amplifier, output digital audio signal is detected to judge whether clipping exists in the digital audio signal or not, and the time of opening clipping inhibition through turning down zero-frequency gain is determined according to the judgment, so that error opening of the clipping inhibition caused by detecting error can be decreased; additionally, according to the audio power amplifier, whether the clipping already disappear or not is judged according to an input analog audio signal, and the time of releasing clipping inhibition through turning up zero-frequency gain is determined according to the judgment, so that the problem that the clipping can not be completely restrained caused by improper releasing and restraining time is avoided.

Antifoam compositions for automatic transmission fluids contain antifoam agents comprising perfluoropolyether compounds (PFPE). An automatic transmission fluid is provided containing the antifoam composition in a lubricating base oil, along with conventional additives such as antiwear agents. Automobile transmissions are provided that contain an automatic transmission fluid containing the new antifoam compositions. In a further embodiment, methods are provided for reducing unwanted noise in an automobile transmission during operation, comprising lubricating the transmission with an ATF containing the antifoam compositions of the invention.

A shear wave transformation medical CT image denoising method based on a fast non-local mean value and a TV-L1 model comprises the following steps: 1) establishing a medical CT image model; 2) performing shear wave transformation multi-scale and multi-direction decomposition on the image to obtain a low-frequency sub-band and a plurality of high-frequency sub-bands; Step 3) using TV-L1 model to decompose the image into a cam part and a text part, and takes a low-frequency sub-band and the cam part to obtain a mixed image; 4) performing fast non-local mean denoising on the mixed image by usingan integral image technology to obtain a new low-frequency sub-band; 5) performing threshold shrinkage processing on the shear wave coefficient of the high-frequency sub-band; 6) performing inverse shear wave transformation on the processed coefficients to obtain a decongested medical CT image; experimental analysis is compared with a traditional de-noising field algorithm, the method is effectively applied to the field of medical CT de-noising, and analysis and diagnosis of doctors can be better facilitated.

A communication control device for passenger protection device includes a satellite sensor unit and an ECU being connected to the satellite sensor unit via a communication line. The satellite sensor unit includes a satellite sensor main body, which detects an impact against a vehicle, and a controller, which obtains a measurement from a signal detected by the satellite sensor main body. The ECU includes a main controller which determines deployment of a passenger protection device. The controller of the satellite sensor unit is adapted to compares the measurement or a calculated value which is calculated based on the measurement with a preset reference value range, and, when the measurement or the calculated value is within the reference value range, the controller transmits a communication from the satellite sensor unit to the ECU at an interval which is longer than a predetermined time interval.

Disclosed is an air blowing system including: an air blowing device; a duct that guides air blown by the air blowing device; and a ventilation section disposed downstream of the duct in terms of an air blowing direction in which air is blown by the air blowing device so that the air blown by the air blowing device strikes and passes through the ventilation section, wherein the duct has a distorted portion where a part of an inner wall face of the duct located between the air blowing device and the ventilation section is distorted perpendicular or substantially perpendicular to the air blowing direction so that the air blown by the air blowing device flows perpendicularly or substantially perpendicularly to the air blowing direction. Also disclosed is an air blowing system including: an air blowing device; and a duct that guides air blown by the air blowing device, wherein the duct has an outer surface on at least a part of which there is provided a surface area reducing portion for reducing a surface area of a continuous face.

The invention relates to an adjustable steering column (1) for a motor vehicle, comprising a rotatable steering shaft (2), which has a shaft part (4) that can be moved axially along the axis of rotation (3) of the steering shaft and that is rotatably mounted in a jacket tube (5), which is mounted for axial sliding in a guide box (7) retained on a retaining part (6) fixed to the vehicle body and which can be adjusted by means of an electric motor (8). Said adjustable steering column is improved with regard to a small installation space of the electrical adjustment system in conjunction with high strength of the steering column in that a gear rack (9, 10, 29) is attached to the outer face (26) of the jacket tube (5) and that the electric motor (8) is fastened to the guide box (7) and drivesa worm gear (11), which protrudes through an opening (12) of the guide box (7) toward the jacket tube (5) and meshes with the gear rack (9, 10, 29).

The invention discloses an image super-resolution reconstruction method based on a convolutional neural network, and belongs to the technical field of artificial intelligence and image processing, and the method comprises the steps: obtaining a primary image of which the resolution needs to be improved, obtaining a super-resolution reconstruction convolutional neural network, receiving the primary image as an input through a preliminary convolution layer, and obtaining a secondary image of which the resolution needs to be improved; and inputting the preliminary feature map into a deep feature mapping unit, so that each integrated feature extraction module performs feature extraction operation on the feature map in sequence, and an image reconstruction unit performs super-resolution reconstruction on the comprehensive feature map. Average pooling, maximum pooling and median pooling are set in the two attention mechanisms to perceive important information in an image, and part of modulation information in a front-stage space modulation module is input into a rear-stage channel modulation module by setting a feature integration unit. Therefore, the post-stage channel modulation module has the visual fields in the space direction and the channel direction at the same time, and the network has the advantages of good reconstruction effect, high robustness and the like.

An electronic device is provided that achieves a reduction in the amount of unwanted noise produced as a consequence of electrical switching associated with pulse width modulation. The electrical device includes pulse width modulation controls for providing a plurality of settings for operation of the device. The electrical device includes a system for selectively controlling the frequency of the pulse width modulation to provide a desired output operational intensity in response to a known input signal. The system includes a high frequency pulse width modulation signal module adapted to provide frequencies above the audible range of anticipated users of the device, thereby reducing or eliminating the production of unwanted noise associated with the operation of such an electrical device.

In a porch or patio railing system having a plurality of vertically disposed pickets, a harmonic stabilizer for dampening forced external harmonic resonance is applied thereto. Each harmonic stabilizer includes an elongated member having a c-shape configuration formed by three wall members including a back wall and a left and right side wall all integrally attached at right angles in relation to one another. A center channel of the elongated member is defined by the three side walls and also includes an open end for providing access to the center channel. A pair of inwardly extending notches attached along outer edges of the left and right side walls provides a friction fit mating mechanism when the harmonic stabilizer is employed onto one of the plurality of vertically disposed pickets.