181results about How to "Reduce noise level" patented technology

Monitoring equipment for an elevator drive control includes two modules, a safety circuit sensor system and a motor-switching and/or brake-switching circuit, wherein the monitoring of a safety circuit and the consequential actions resulting therefrom takes place exclusively by means of electronic components while avoiding electrically conductive separating locations. By the use of electronic components, electromechanical switching elements, which have electrically conductive separating locations, can be dispensed with. In addition, an appreciable reduction in the noise level is achieved, since switching noises no longer arise. This has an advantageous effect particularly in the case of elevator installations without a machine room. Furthermore, the manufacturing costs can be significantly reduced and a high security and reliability of the monitoring equipment can be ensured by the use of usual electronic components.

The present invention relates to wireless communications, and in particular although not exclusively, to networks of indoor collocated or overlapping wireless coverage areas especially those intended for operation in unlicensed spectrum such as the Industrial Scientific and Medical (ISM) bands. The present invention provides a method of controlling the transmission power associated with an air interface channel, the method comprising determining a quality of service measure for a signal to be transmitted on a second air interference channel; determining an interference measure corresponding to the interference on said second air interface channel which will be caused by transmissions on said first air interface channel; requesting the changing of the transmission power associated with the first air interface channel when the signal is to be transmitted on the second air interface channel, when the quality of service measure is above a predetermined value and when the interference measure is above a predetermined value for said quality of service value.

A sound absorptive multilayer composite having an air-impermeable barrier, an air-permeable reinforcing core having an airflow resistance of at least about 100 mks Rayls and a thickness at least about ⅓ the final composite thickness, an air-permeable open cell foam or fibrous pad having an airflow resistance less than about 2000 mks Rayls and a thickness at least about 1/10 the final composite thickness and a semipermeable airflow-resistive membrane having an airflow resistance of about 500 to about 4000 mks Rayls can provide improved acoustic performance. For example, existing vehicular headliner designs may be improved by adding a properly chosen and properly positioned semipermeable airflow-resistive membrane, a properly chosen and properly positioned air-impermeable barrier, or a properly chosen and properly positioned open cell foam layer.

The present invention helps to reduce the noise level and to enhance the quality of speech signals, in communications, computers, entertainment and other applications, where microphones and loudspeakers are involved. Additionally, the invention includes a new noise reduction and speech enhancement algorithm which is created based on the principles of human hearing mechanism. Further, the algorithm uses a new set of speech recognition parameters instead of just signal-to-noise ratio (“SNR”) as used in the prior art.

The invention provides a vapor-liquid two-phase flow tube shell type heat exchanger. The heat exchanger comprises a shell, wherein sealing heads are arranged at two ends of the shell respectively; tube plates are arranged in connection positions between the sealing heads and the shell; heat exchange tubes are connected with the tube plates at two ends; vapor phase in vapor-liquid two-phase flow can be condensed into liquid phase in the heat exchange process; the vapor-liquid two-phase flow flows in a tube process; separation devices used for decreasing vibration and reducing noise are arranged in the heat exchange tubes; a plurality of separation devices are arranged in the same heat exchange tube; the length of the separation devices is gradually reduced along the flowing direction of flow in the heat exchange tubes. According to the vapor-liquid two-phase flow tube shell type heat exchanger, the vibration of the tubes can be decreased to a maximum extent due to the length change of the separation devices when the vapor-liquid two-phase flow flows in the tubes; the noise level is reduced; meanwhile, the flowing resistance is reduced; the heat exchange uniformity is improved.

A stick type vacuum cleaner is provided. The stick type vacuum cleaner includes a suction port assembly and a stick unit having a first end is engaged with a first side of the suction port assembly and a second end having a handgrip. The suction port assembly includes a casing part comprising a suction port through which air and dust is drawn from the object being cleaned, a suction force generating unit formed inside the casing part to generate a suction force, a dust separating unit to separate and accommodate dust from the drawn air and dust, and a power supply unit to supply power to the suction force generating unit. The suction force generating unit is disposed between the suction port and the dust separating unit so that the drawn air and dust is passed through the suction force generating unit before being introduced into the dust separating unit.

Systems and methods for reducing the noise level in a multi-channel digital audio system by staggering the timing of the pulse-width modulation in the different channels and thereby reducing the magnitude and increasing the frequency characteristics of the generated switching noise. One embodiment comprises a multi-channel digital PWM amplifier in which the timing signals used by each channel's modulator are staggered to evenly space the switching edges of the generated PWM signals. An additional, complementary delay is implemented in each of the channels to equalize the total delay for each channel so that the outputs of the channels are synchronized. The different channels may be implemented on different chips, in which case the chips may be synchronized prior to staggering the signals processed in each of the channels.

An imaging device is disclosed. The device includes: a unit pixel that outputs an analog electric signal in accordance with a signal charge; a local voltage supply circuit that generates a local voltage different from an operation voltage; a reference signal generation section that generates a reference signal based on the local voltage provided by the local voltage supply circuit; and a processing section that converts, by referring to the reference signal generated by the reference signal generation section, the analog signal provided by the unit pixel into a digital signal. In the imaging device, the reference signal generation section keeps constant a load current of the local voltage supply circuit in an operating state.

Described are metallized biaxially oriented polylactic acid (BOPLA) films with a novel formulation that exhibits a softer feel and quieter sound, without jeopardizing film making stability. It has been found that when these films are metallized, moisture barrier properties are surprisingly improved compared to conventional metallized BOPLA films. Specifically, the moisture barrier of the films may be 2.0 g/m²/day or less at 38° C. and 90% relative humidity. The films can be used, for example, in packaging applications. The films have characteristics that are beneficial to converting processes, are economical, and maintain bio-compostability similar to typical BOPLA films.

This invention refers to the traction lugs of reinforced elastomeric endless traction bands, and more particularly to those which are used on heavy vehicles like defense vehicles or for skid steer vehicles. More specifically, the invention relates to traction lugs which are angled with respect to the transversal axis of the traction band and preferably disposed in chevrons, which optimize the band's traction while reducing the occurrences of teeth skipping and the level of vibrations and noise induced by the interaction of the traction band with the sprocket.

An axial-flow fan according to the present disclosure can increase the amount of the airflow and simultaneously reduce the noise level. A plurality of stationary blades 11A to 11D are curved, in a convex manner, toward a rotating direction of an impeller. The plurality of stationary blades 11A to 11D are generally inclined so that discharge-side edge portions 11d thereof are located more forward than suction-side edge portions 11c thereof in the rotating direction. An inclination angle θ4 of each of the plurality of stationary blades 11A to 11D in the vicinity of the external end portion 11a is larger than the inclination angle θ3 in the vicinity of the internal end portion 11b. The inclination angle is gradually changed from the vicinity of the external end portion 11a toward the vicinity of the internal end portion 11b.

The present invention provides an aqueous composition useful for polishing copper on a semiconductor wafer comprising by weight percent 1 to 15 oxidizer, 0.1 to 1 inhibitor for a nonferrous metal, 0.05 to 3 complexing agent for the nonferrous metal, 0.01 to 5 carboxylic acid polymer, 0.01 to 5 modified cellulose, 0.0001 to 2 salt having a cationic and an anionic component, and balance water, the salt reducing noise level from vibration between the wafer and a polishing pad.

The invention discloses a kitchen ventilation system based on an air curtain and filtration. The system consists of a fresh air section, an air curtain section and an air exhaust section, wherein the fresh air section consists of a fresh air port, a PM2.5 filter, an air feeder, an injector air-supplement branch pipe and the like; the air curtain section consists of a reducing pipe, a gas stove, an angle-adjustable air curtain, a hot air curtain blowing-in branch pipe and the like; the air exhaust section consists of an exhaust hood, a one-way check valve, an exhaust fan and an air outlet; after being filtered, one path of fresh air is conveyed to the injector air-supplement branch pipe so as to be used for injection of the gas stove, one path of fresh air is conveyed to the air curtain for cooking in summer and transitional seasons, and another path of fresh air is conveyed to the hot air curtain blowing-in branch pipe so as to regulate the temperature of the air curtain and meet the heat comfort requirement of a human body; the jet current and fume of the air curtain are discharged to the outdoors by virtue of the exhaust hood. The system can be used for achieving the effects of insulating heat, reducing indoor cooling load, improving the cooking comfort degree and health degree, preventing cooking fumes from spreading into a horizontal living room, improving the combustion efficiency of the system and the like, is beneficial to formation of an open kitchen and ensures that the architectural space is fully utilized.

A method of processing noise in image data by an image processor having a signal-processing portion converting an image signal from an image sensor into a digital signal and outputting the converted signal as image data for each frame, the image data indicating sets of pixel values each having a brightness at a corresponding one of coordinate points arranged in directions of rows and columns is disclosed. The method includes the steps of: extracting pixel values; deciding pixel value; finding autocorrelation coefficients of pixel values which are less than a first threshold value; and deciding random noise in the image.

A radar level gauge system for determining the filling level of a filling material in a tank is disclosed. The system comprises an antenna device for emitting measuring signals towards the surface of the filling material and a receiver device for receiving echo signals from the tank. Further, the system comprises processing circuitry for determining the filling level of the tank based on said echo signal, wherein said processing circuitry is adapted to amplify the received echo signals in dependence of the distance from which the echo signals originates, in such a way that an echo signal from a lower filling level is more amplified than an echo signal from a higher filling level. The processing circuitry is adjustable to optimize the amplification of the echo signal based on the height of the tank. A corresponding processing circuitry and method of operation is also disclosed.

The invention relates to a radial fan with a casing and in it an axially placed wheel, wherein the casing has an axially placed air inlet, an exhaust (5), a bottom section (6) with a bottom reference surface (7) arranged orthogonally to the axis and a spirally shaped compression space located radially around the wheel that extends to the exhaust port; and wherein the wheel has a cover disk that faces the air inlet port and a supporting disk; wherein the radial fan is characterized in that the spiral-shaped compression space (8) expands both in a radial direction from the axis towards the exhaust port (6) as well as in an axial direction; wherein the axial expansion extends over at least 180° of the spiral circumference; and in which a hollow cylindrical cup-shaped section (9) is recessed in the bottom section (6) in an axial direction beyond the bottom reference surface (7) into which the wheel is placed in such a way that an inside of the supporting disk of the wheel runs flush with the bottom reference surface (7).

The invention discloses a fresh air integrated type air purifier. The integral design of the air purifier and a fresh air fan is adopted. The purifier is communicated with outdoor fresh air and can be arranged in a vertical or wall-mounted mode, and an exhaust opening is not formed. An air inlet cavity is formed in the lower portion of the shell, a fresh air port and air return ports are formed in the lower portion of the shell and are communicated with the air inlet cavity, and the multiple air return ports can be included to be communicated with other rooms or space. The fresh air integrated type air purifier comprises an HEPA high efficiency filtering module, a primary efficiency filtering module and a medium-efficiency filtering module or a benzene-removing filtering module or a methanal-removing filtering module or a TVOC-removing filtering module or a bacteria-removing filtering module or a stink-removing filtering module or a combination of the medium-efficiency filtering module, the benzene-removing filtering module, the methanal-removing filtering module, the TVOC-removing filtering module, the bacteria-removing filtering module and the stink-removing filtering module. The diameter size phi of a fresh air hole or a fresh air pipe on a wall is 30-90 mm. A special centrifugal fan is adopted, and the shell is designed in a curved mode according to pressurizing and is provided with a guiding plate. According to the fresh air integrated type air purifier, the air opening pipe diameter is reduced, pipeline losses are reduced, fan power is reduced, electricity and energy are saved, silence is achieved, installation is facilitated, and use is convenient. Meanwhile, the purifying effects that PM 2.5 is removed and the index can reach the level of 0.1-0.5 micron are achieved.

The invention relates to a radio system and a transceiver method. The method comprises transmitting (402a) a signal of at least one type by a transceiver of the first type; receiving (404a) a signal by a transceiver of the second type with at least two differently polarized antennas; performing (406a), by the transceiver of the second type, measurements of the received signal to determine its polarization; determining (408a) the polarization of the transceiver of the first type; adjusting (410a) the signal transmitted by the transceiver of the second type in such a way that the polarization of the signal is matched with the polarization used by the transceiver of the first type; transmitting (412a) at least two orthogonally polarized, polarization-matched signals by the transceiver of the second type; receiving (414a) the polarization-matched signals by the transceiver of the first type by using at least two antennas of different polarizations.

A method for determining a deblurred image from images captured using an image sensor comprising a two-dimensional array of light-sensitive pixels including panchromatic pixels and color pixels, the method comprising: receiving image sensor data from the image sensor for a sharp image of a scene captured with a short exposure time; receiving image sensor data from the image sensor for a blurred image of the scene captured with a longer exposure time than the sharp image; determining an interpolated sharp grayscale image from the sharp image; determining an interpolated blurred color image from the blurred image; determining an interpolated blurred grayscale image from the blurred image; determining a blur kernel responsive to the sharp grayscale image and the blurred grayscale image; determining a deblurred image responsive to the blurred color image and the blur kernel; and storing the deblurred image in a processor-accessible memory system.

A signal transmission system for transmitting an UP LINK signal received by an antenna shared by at least a first radio communication system and a second radio communication system to at least a radio base station of the first radio communication system is provided. In the signal transmission system, the first radio communication system is affected by a spurious signal of a radio communication system other than the first radio communication system, and the signal transmission system includes: a determination part for determining whether a signal level of a signal, included in the UP LINK signal, from at least the second radio communication system exceeds a permissible level; and a level adjustment part for adjusting a power level of the UP LINK signal so as to output an adjusted signal according to the determination result, and sending the adjusted signal to the radio base station.

The invention relates to the field of digital image processing and can find use in suppression of noise in digital images, formed by high-energy radiation, including X-ray radiation. Specifically, the invention relates to a method for suppression of noise in digital x-ray images. The objective of the invention is to provide a method for noise suppression in digital X-ray images that has extended functionality, specifically, a method that makes it possible to reduce residual noise level and amount of artifacts in the form of discontinuities, directed along local orientation of object borders in textured image areas, to reduce residual LF noise level, and to eliminate over-smoothing (excessive filtering) of fine details. The technical innovation achieved is the improvement of digital image processing quality.

An actuator retract system and method for moving read/write heads from data regions on discs to non-data locations in a disc drive is disclosed. The non-data locations may be on or in close proximity to the discs. The non-data locations may be a landing zone or a load/unload ramp. At disc drive power-down, power generated from the rotational inertia in rotating discs is used to supply a current to a coil of a voice coil motor operably coupled to the actuator. During such power-down operation, a desired velocity is maintained using acceleration or deceleration, when necessary. The current generates an electric field around the coil that interacts with a magnetic field in the voice coil motor to move the actuator such that the read/write heads are retracted to the non-data location.

When a running web (3) is coated with a liquid coating mixture, at least one side of the web is provided with a coating (40, 40') of coating mixture. Existing excess (33) of coating mixture in or adjacent to the regions of the edge portions of the web is removed by being blown off downstreams of where the coating operation is performed.

An aircraft configuration that may reduce the level of noise, infrared radiation, sonic boom, or combination thereof directed towards the ground from an aircraft in flight. In accordance with an embodiment of the present invention, an aircraft includes a tubular fuselage, two delta wings, at least one engine mounted to the aircraft and higher than the wings, and vertical stabilizers mounted on each wing outboard of the outermost engine. Each wing may include a wing strake at the leading edge of the wing and extending to the fuselage and an aft deck. The leading edge of the wing may extend forward of the intake of the engine, and the trailing edge of the aft deck may extend aft of the engine exhaust. The aft deck may include an upwardly rotatable pitch control surface at the trailing edge of the deck.

A panel assembly and method of making the same, whereby the panel assembly includes an adhesive located onto one or more edges of a layered honeycomb structure and a mesh material adhered in between the layered honeycomb structure by the adhesive.

Improved data acquisition systems and methods that enable large numbers of data samples to be accumulated rapidly with low noise are described. In one aspect, a data acquisition system includes an accumulator that has two or more parallel accumulation paths and is configured to accumulate corresponding data samples across a transient sequence through different accumulation paths.

In a frequency modulation type switching regulator for producing an output voltage to a load, an error amplifier produces an error voltage indicative of a difference between the output voltage and a reference voltage. A switching device is turned on and off at a switching frequency corresponding to the error voltage. A voltage-frequency modulation circuit monitors an operation condition of the load. The modulation circuit generates a varying voltage, which varies around the error voltage, when the monitored operation condition is substantially unchanged. The switching frequency is switched to another frequency corresponding to the varying voltage, so that noise level may be reduced.

An optical device for generating a frequency comb includes an optical source and a first waveguide comprising a nonlinear optical medium operable to mix at least two input optical waves to generate a plurality of first optical waves. The optical device also includes a second waveguide concatenated to the first waveguide and characterized by a first dispersion characteristics and operable to compress the waveforms of the plurality of first optical waves and to reduce a frequency chirp introduced by the first waveguide. The optical device additionally includes a third waveguide concatenated to the second waveguide. The third waveguide comprises a nonlinear optical medium and is operable to mix the plurality of first optical waves to generate a plurality of second optical waves and to increase a total number of second optical waves with respect to a total number of first optical waves.

With a method of controlling a vehicle driving system comprising a flywheel for accumulating the output of engine as energy, a motor generator to be driven by the engine to generate electricity and an output shaft interlocked with the drive wheels of a vehicle, provided that (A) the lower limit rotational speed of the flywheel at the time of restarting the engine to supply rotational energy to the flywheel while decelerating the flywheel by not operating the engine is Nfc, (B) the largest power of the engine operating on the fuel economizing characteristic curve is Pem, (C) the pedaled quantity of the accelerator pedal is Acc and (D) the pedaled quantity of the accelerator pedal for the largest power output of the engine is Acc=1.0, (E) when 0≦Acc≦1.0, ① the power level of Acc×Pem=Pei is determined, ② the rotational speed Nei of the engine is determined for power level Pei on the fuel economizing characteristic curve and ③ the value obtained by adding a predetermined value dNe to the value of Nei is defined as the lower limit rotational speed Nfc.

The present invention discloses a GNSS-INS vehicle attitude determination method based on a single antenna, including the steps as below: mounting a GNSS antenna at a centroid and in the center of the vehicle, and mounting the IMU measuring unit of the MEMS sensor on the steering shaft of the vehicle; obtaining the position and velocity information of the vehicle by means of the GNSS antenna, obtaining the heading angular speed information of the vehicle by means of the IMU measuring unit; calculating the attitude angle of the vehicle by means of the combination with accelerometer and gyroscope; calculating the heading angle of the vehicle based on the position, velocity, and heading angular speed of the vehicle. The method combines the advantages of the short-term high precision of the IMU gyroscope and the long-term high stability of the GNSS single antenna, so as to avoid the divergence phenomenon.