321results about How to "Reduce distortion" patented technology

System and method for improved time-interleaved analog-to-digital converter arrays which reduces sampling mismatch distortion found in prior art arrays. There may be two causes of non-uniform sampling mismatch in a TI-ADC array, a mismatch due to skew and a mismatch due to clock jitter. To minimize non-uniform sampling mismatch, the mismatch due to skew can be addressed. A preferred embodiment comprises adjusting a delay imparted on the sampling clock by an adjustable delay in each channel of a plurality of channels in the TI-ADC array to minimize skew and randomly switching between two delays that span a zero-skew delay to reduce residual skew in each channel and thus eliminate (or reduce) frequency domain tones caused by non-uniform sampling mismatch.

A drive apparatus for driving two motors by PWM control of respective switching elements connected to the motors, whereby respective control signals are applied to the switching elements such that each commencement of a transition of one of the switching elements from the non-conducting to the conducting state coincides with the termination of a transition of the other switching element from the conducting to the non-conducting state, thereby reducing generated electrical noise, and for supplying equivalent values of drive voltage to two motors of different power ratings which rotate respective cooling fans, to obtain equalized levels of air flow rate.

The present invention relates to a power factor correction circuit for compensating distortion of an input current. According to the exemplary embodiment of the present invention, a turn-on interval length of a switch is controlled according to a voltage induced in a secondary winding wire of an inductor since the voltage induced in the secondary winding wire has information on an input voltage when the switch is turned on. The turn-on interval length of the switch is reduced when the input voltage is great and is increased when the input voltage is low. Therefore, distortion of the input current may be compensated by controlling the turn-on interval of the switch according to the voltage induced in the secondary winding wire without using an additional circuit for sensing the input voltage.

A power amplifier controller circuit controls a power amplifier based upon an amplitude correction signal indicating the amplitude difference between the amplitude of the input signal and an attenuated amplitude of the output signal. The power amplifier controller circuit comprises an amplitude control loop and a phase control loop. The amplitude control loop adjusts the supply voltage to the power amplifier based upon the amplitude correction signal. The RF power amplifier system may reduce the corrective action of the amplitude loop during periods of relatively rapid changes in amplitude, and thus distortion can be further reduced.

A synthetic aperture radar (SAR) for a moveable platform includes an antenna, a radar transmitter and radar receiver cooperating with the antenna. A radar processor is connected to the radar transmitter and radar receiver to account for the Faraday rotation introduced by propagation through the ionosphere by estimating an individual ionospheric distortion for each received echo pulse based upon a measured Faraday rotation, and reducing the ionospheric distortion for each received echo pulse based upon the estimated individual ionospheric distortion associated therewith for providing a compensated echo pulse.

The invention discloses a capsule detecting machine which comprises a capsule arranging device, a transmitting device, an image detecting device and an eliminating device, an arch-shaped lampshade and a reinforcing light source are used for providing a light source which is uniform and has no shade on the surface of a capsule and leading the capsule to roll in the detection position, thereby being capable of shooting a complete capsule image, greatly reducing the distortion rate, improving the detection precision and leading the lost or wrong judgment rate to be low; and the eliminating device adopts an electromagnet and a push rod to greatly improve the capsule elimination rate and the precision. The machine has a wide range of applications and is suitable for detecting the hollow hard capsule and detecting a capsule preparation after filling medicine.

An optical system comprising the following. A camera that is capable of reducing distortion from an optical system has an optical system that is configured to capture a wide field of view of a subject. An image sensor and circuitry are coupled to the optical system and are configured to convert the output of the optical system to electrical signals suitable for use by an image processing circuit. The image processing circuit is coupled to the image sensor and is configured to reduce optical distortions from the combination of the optical system and the image sensor where the correction includes reference to a table of parameters held in a solid-state memory, attached to said image processing circuit, wherein the table of parameters may be specific to the particular combination of said optical system and said image.

Method and apparatus are provided for high linearity and low noise communication signal mixing. The apparatus includes a high linearity low noise mixer having an input stage coupled to a switch stage by a series-coupled blocking capacitance and input resistance. The input stage includes a buffer with negative feedback, and the switch stage includes a transistor based switch network connected to an amplifier that has feedback resistance and shunting capacitance. The method includes AC coupling an RF signal, increasing a gain of the RF signal, reducing third-order distortion by negatively feeding-back the RF signal, blocking IM2 generated from said gain increasing step, increasing a second-order input intercept point (IIP2) by attenuating the RF signal across a resistance, and applying a local oscillator input to the RF signal.

The invention discloses a 3D printer sprayer with a rotation switching function in order to solve the problem that a 3D printer is low in printing efficiency and troublesome in replacing of a spray nozzle of an extruder. The 3D printer sprayer comprises a fixed seat (1), a heating bar (2), a thermocouple (3), a threaded stop ring (4), spray nozzles and a rotating seat (6). The spray nozzles comprise the first spray nozzle (5), the second spray nozzle, the third spray nozzle and the fourth spray nozzle. The heating bar (2) and the thermocouple (3) are installed in a heating bar installing hole (13) and a thermocouple installing hole (11) of the fixed seat (1) correspondingly. The threaded stop ring (4) enables the rotating seat (6) to be fixed to the fixed seat (1). The threaded stop ring (4) is in threaded connection with the fixed seat (1). Four limiting steel balls (17) on the rotating seat (6) are matched with four limiting grooves formed in the fixed seat (1). The first spray nozzle (5), the second spray nozzle, the third spray nozzle and the fourth spray nozzle are installed inside four spray nozzle installing holes (16) formed in the rotating seat (6).

A system comprises an encoder configured to compress attribute information and/or spatial for a point cloud and/or a decoder configured to decompress compressed attribute and/or spatial information for the point cloud. A point cloud attribute transfer algorithm may be used to determine distortion between an original point cloud and a reconstructed point cloud. Additionally, the point cloud attribute transfer algorithm may be used to select attribute values for a reconstructed point cloud such that distortion between an original point cloud and a reconstructed version of the original point cloud is minimized.

The present invention provides a method of manufacturing a compound semiconductor device capable of improving yield when a wafer is divided into device regions. The method of manufacturing a compound semiconductor device includes a division step. The division step includes: a first division step of dividing a wafer 30 in a first direction α to obtain first strip wafers each having at least two rows of device portions 10 arranged in the first direction α; a second division step of dividing the first strip wafer in a second direction β to obtain second strip wafers each having a row of the device portions 10 arranged in the second direction β; and a third division step of dividing the second strip wafer into the device portions 10, thereby forming compound semiconductor devices including the device portions 10.

An aerogel composite comprises a support comprising a melamine-formaldehyde copolymer, wherein the support comprises a plurality of micro-openings, and an aerogel matrix disposed in the micro-openings.

A 3D image data compression system, a method a program and a recording medium storing the program are provided for effectively compressing a data amount and obtaining a decompressed 3D image with little distortion. A recording medium also is provided for storing the compressed 3D image data. The system generates, a cut path based on a texture distribution of the surface of the 3D image so as to reduce the distortion of the 3D image reproduced from the compressed data. Geometric information and optical information of the 3D image data are correlated with points within a 2D planar figure based on the texture distribution of the surface of the 3D image so as to reduce the distortion of the 3D image reproduced from the compressed data.

The present invention relates to pulse width modulation (PWM) modulators, especially but not exclusively for digital audio applications; and to quantisers and power switching for the same. The present invention provides a pulse width modulation (PWM) modulator or converter having a guard band quantiser arranged to block low level signal inputs to the modulator in order to prevent narrow width output pulses. This arrangement is particularly advantageous when applied to tri-level PWM modulators, but can also be applied to other level PWM modulators such as bi-level for example. Quantisation noise can be reduced by implementing the quantiser in a noise shaper circuit (or possibly a SDM) having loop feedback.

An electrostatic loudspeaker (ESL) system includes a damping screen adjacent an outside surface of at least one of its stators to reduce distortion of acoustic output rendered by the loudspeaker's diaphragm, including effects of resonance of the diaphragm. A resilient excursion limiter placed adjacent an inside surface of at least one of the stators prevents contact of the diaphragm with the stator. A conductive portion of the diaphragm is printed with a conductive ink layer that includes conductive nanofibers. The loudspeaker system includes a dipole-radiating ESL element, an unbaffled or partially baffled dynamic loudspeaker and a baffled monopole-radiating dynamic loudspeaker (subwoofer), all essentially co-planar. The unbaffled or partially baffled dynamic loudspeaker provides a smooth transition in sound between the dipole-radiating ESL element and the monopole-radiating subwoofer. The ESL system includes two or more invertedly-driven ESL elements of different sizes, each element handling a different range of frequencies.

A method and apparatus for forming an object by additive layer manufacturing. The method comprises: a) applying, by a heat source (4), heat to a portion of a surface of a workpiece (1) sufficient to melt said portion; b) adding material to the melted portion and moving the heat source (4) relative to the workpiece (1) whereby progressively to form a layer of material (10) on the workpiece (1); c) cooling the formed layer (10) to bring at least part of the layer (10) to a state of crystallisation, there producing a modified workpiece; d) peening, using a plurality of independently controllable impact treatment devices (7), the modified work-piece so as to plastically deform the cooled at least part of the layer (10); and repeating steps a) to d) as required whereby to form the object.

The embodiment of the invention discloses a method for correcting face distortion and a terminal. The method comprises: a step of detecting human faces in a view finding image taken by a camera of the terminal; a step of judging whether a distortion area in which distortion coefficients are greater than a preset threshold exists in M human faces when it is detected that the M human faces exist in the view finding image, wherein M is an integer greater than or equal to 1; and if so, the distortion area is subjected to the distortion correction. According to the embodiment of the invention, the human face in the view finding image taken by the camera is detected, and the detected human face is subjected to the distortion correction, thereby reducing the distortion degree of the distorted human face in a wide-angle camera.

The invention belongs to the field of advanced manufacturing, and particularly relates to a hot isostatic pressing two-step forming method of a high temperature alloy compact piece. The method includes two steps of hot isostatic pressing, according to a first step of hot isostatic pressing, a formation control mold is controlled to deform at a low temperature or pressure, part pressed blanks high in precision of shapes and sizes are obtained, wrapping sleeve limitation does not exist in a second forming step, the temperature and the pressure which are most suitable for formation material are adopted, both holes left in the first step are eliminated, compactness is improved, and the precision of the shapes and the sizes is guaranteed, and good organizational performance under the most suitable temperature and the most suitable pressure is obtained. Due to the fact that the temperature and the pressure in the first forming step are low, material choosing problem of complicated formation control molds is solved, material which is difficult to process and high in high temperature yield strength is not required to be chosen as a formation control type mold core, and manufacture cost of the mold is reduced.

This invention provides a power converter and a power conversion method that can reduce distortions of an output voltage and an output current, can simply a calculation processing, and is inexpensive and has a high performance even when a PWM pulse gets narrow. In a power converter for connecting each phase of an AC power supply to each phase on an output side through a bidirectional switch and converting an AC source voltage by PWM, the power converter includes a one-phase fixing switching mode and a full phase switching mode, and a mode switching section for switching from the full phase switching mode to the one-phase fixing switching mode. Moreover, the power converter includes a vector component calculator (13) for selecting a voltage vector equal to an instantaneous voltage vector from a hexagonal space vector diagram and calculating a vector component of the instantaneous voltage vector, and a time calculator (14) for calculating an output time of the vector component.

The object of the present invention is to provide a method for manufacturing a soft magnetic material, a soft magnetic material, a method for manufacturing a P/M soft magnetic material, and a P/M soft magnetic material which achieve the desired magnetic properties.

In the method for manufacturing the soft magnetic material of the present invention, there is a first heat treatment step (step S3) in which a metal magnetic particle 10, which has iron as its main component, is heat treated to a temperature of 900 degrees C. or greater and less than the melting point of metal magnetic particle 10. After the first heat treatment step (step S3), there is a step for forming a plurality of composite magnetic particles 30 which are metal magnetic particles 10 surrounded by an insulation covering 20 (step S6).

The invention discloses a method for manufacturing a shell of an electronic controller for a vehicle. The method comprises a step of manufacturing a mould, a step of die-casting, a step of removing material handles and sludge ladle from a blank, a step of removing burrs, a step of vibration grinding, a step of testing air-tightness, a step of checking flatness and position of a mounting hole, a step of washing and drying and a step of warehousing finished products. The method adopt high-tech means to ensure design of the mould and high manufacture precision, and selects proper die-casting equipment to ensure small deformation of a formed product. Through the step of vibration grinding, proper vibration grinding equipment, a grinding material, washing agent and proper process parameters are selected, after the surface of the formed product is washed, the product has high cleanliness (surface tension reaches 56mN/m) and high dimension precision; actual operation process parameters are set for key steps, such as die-casting, grinding, washing and the like so that the method adapt to standard production and mass production of the products.

An image processing method for cars, a method for generating a car surround view image, an image processing apparatus for cars, and a car surround view system. The method for generating a car surround view image comprises: collecting images respectively in six directions of front, rear, left front, left rear, right front, and right rear of a car body of a car by using six cameras (11-16) provided on the car body of the car; generating six top view images according to the collected images in the six directions; performing image splicing on the generated six top view images and obtaining a surround view image in combination with a top view image of the car body of the car. By means of the method for generating a car surround view image of the present invention, angles of view of cameras required are reduced, and therefore, a camera with a relatively small angle of view may be adopted, thereby effectively lowering manufacturing cost of a surround view system, facilitating popularization of surround view systems, and at the same time also reduce a degree of distortion of an image.

A frequency converter comprises a first mixer which frequency-converts an input signal with a first conversion gain in accordance with a local signal, a second mixer which frequency-converts the input signal with a second conversion gain lower than the first conversion gain in accordance with the local signal, and an adder which adds the output signals of the first and second mixers in opposite phase to each other in order to reduce distortion.

This invention relates to a hearing instrument (100), which comprises a first microphone (102) converting ambient sound to an ambient sound signal, a signal processor (104) generating a processed sound signal based on the ambient sound signal, a controllable output stage (106) generating a driving signal based on the processed sound signal and in accordance with a control signal, a speaker unit (110) generating a sound in the ear canal based on said driving signal, a second microphone (116) located in the ear canal of the user and converting the sound in the ear canal to the monitor sound signal, and a linearization stage (108) comparing the processed sound signal and the monitor sound signal and generating the control signal based thereon.

An optical projection system enlarges an image on an image display element and projects the enlarged image onto a screen. The system includes the image display element, a first optical system including lens groups arranged in order from an image display element side, a lens barrel holding the lens groups, and a free-form surface lens rotationally asymmetric and made from plastic, and a second optical system including a curved mirror disposed after the first optical system, wherein the free-form surface lens is formed to decrease in thickness from an intersection point between a surface of the free-form surface lens and an optical axis of the first optical system to an outer periphery of the lens along a line extending to the outer periphery.

An anti-deformation assistive tool for welding thin-wall box bodies comprises an inner fixing frame and an outer clamp. The inner fixing frame comprises a box body, movable pressing blocks and adjusting bolts. Two adjacent faces of the box body are respectively connected with one movable pressing plate through the adjusting bolts, and by means of adjusting the adjusting bolts, relative distance between the movable pressing blocks and connecting faces of the box body where the movable pressing blocks are located can be adjusted. The two movable pressing blocks and the other two faces of the box body jointly form supporting for two lateral walls of the inner cavity of a thin-wall box body. The outer clamp comprises a cramp frame and a movable handle pressing bolt, the cramp frame is clamped outside two opposite lateral walls of the thin-wall box body, the movable handle pressing bolt is connected on one clamping finger of the cramp frame, a bolt head part of the movable handle pressing bolt is pressed on the lateral wall of the thin-wall box body. The anti-deformation assistive tool for welding the thin-wall box bodies utilizes the adjustable supporting to fix shape and position of the inner cavity in the box body, enables size of a supporting face and the size of the inner cavity of the box body to be consistent through the adjusting bolts, and then utilizes the external clamping, thereby enabling the box body to be stable in structure, effectively reducing deformation during welding, overcoming the shortcomings that in the prior art, only external clamping is utilized, and deformation of shape dimension contracting during cooling after welding can not be controlled, and welding quality of products is improved.

The invention relates to a method for map construction based on a UWB indoor locating technology and a laser radar. A UWB and a laser radar double sensor are adopted to construct a map, and it can be guaranteed that data of the laser radar makes errors reduced when UWB positioning inaccuracy is caused due to the indoor metal blockage. When the data of the laser radar is reduced due to positioning accuracy of a moving object, the UWB positioning can make the errors reduced. The method improves map construction accuracy and reduces map distortion sense.

The invention provides a connecting method for connecting special duct pieces and a station structure in a subway shied tunnel extended station. The connecting method solves key problems that a station is built in subway regional shield extended construction process from aspects such as the constitution of the duct pieces, the assembly mode of the duct pieces, the connecting joint between the duct pieces and the station structure, etc. Through strengthening reinforcing bars, greater internal force born by the shield tunnel duct pieces in the process that the station is built by extension is satisfied, thereby guaranteeing the safety of the duct pieces; and after local duct pieces are removed, steel plates and steel reinforcement connectors are pre-embedded through straight-joint assembly and connected conveniently with the station structure, so that the connecting joint has enough rigidity to transfer axial force, bending moment and shearing force, the distortion of the joint is reduced, waterproofing processing to the joint can be effectively carried out, and the connection problem that the high-rigidity main structure of the station is connected with the high-flexibility structure of the duct pieces is solved. The shape of the special shield duct pieces are consistent with the shape of common subway regional tunnel shield duct pieces, so the same mould which is either applied to the special shield duct pieces or the common subway regional tunnel shield duct pieces can be used for production.

The invention discloses a building displacement turning method. The building displacement turning method comprises the following steps: (1) pouring and manufacturing a turning front displacement railway, a turning rear displacement railway and a turning front support exchanging beam before the displacement on a building which needs to turn; (2) cutting off a column or a wall from a foundation so as to transfer to the turning position through a traction or pushing gear; (3) paving steel rolling shafts on the turning rear displacement railway, and supporting a channel steel on a steel rolling shaft to be used as a bottom template to pour and manufacture the turning rear support exchanging beam; (4) cutting the channel steel adjacent to the rolling shaft arranged below the turning front support exchanging beam, taking out the rolling shafts, changing the transmission pipeline of the building load from the displacement front support exchanging beam, the displacement front rolling shafts and the displacement front railway to the displacement rear support exchanging beam, the displacement rear rolling shafts and the displacement rear railway; and (5) installing the traction or pushing gear after displacement, and continuing with the displacement. The building displacement turning method provided by the invention does not need a lifting jack to jack to complete the rolling shafts turning, thereby avoiding additional internal force generated by jack deformation; the rolling shafts are paved on a turning rear railway so as to manufacture a turning rear support exchanging beam, the beam bottom deformation is small, the flatness is high, and the building displacement turning method is beneficial for displacement.

There is provided a method of performing auto white balance including: setting a plurality of sections of a whole range of a value of each of Y, Cb, and Cr in the YCbCr color space, according to a size of each value; calculating an accumulated Y, Cb, and Cr value of pixels included in each of the plurality of sections; determining effective sections according to the number of the pixels included in each of the plurality of sections; calculating a mean Y, Cb, and Cr value of pixels included in all of the effective sections by using the accumulated Y, Cb, and Cr value of each of the effective sections; calculating a mean RGB value by converting the mean Y, Cb, and Cr value into an RGB color space; and determining an RGB color gain of a Bayer image outputted from an image sensor by using the mean RGB value.