1139 results about "Noise generation" patented technology

A high-speed surgical handpiece (10) suitable for vitreoretinal surgery having a cutter (42) and actuators (36). The cutter (42) is a guillotine-type cutter activated by an array of leveraged piezoelectric actuators (30) that receive a driving signal from a driving controller. The controller can have control and display units with a plurality of input mechanisms receiving input from a user who selects a desired cutting rate and frequency for the cutter. The control unit produces a piezoelectric actuator output signal based on the inputs received. Fast cutting rates with reduced duty cycle as well as a proportional mode of operation are available, allowing slow controlled cutting action, for example proportional to depression of a foot-pedal (74). Low degrees of vibration and noise generation are produced.

Disclosed is a multi-phase power regulator that accurately senses current at a load in a lossless manner and adjusts the power supplied to the load based on the sensed current. Also disclosed is a method of calibrating a multiphase voltage regulator by applying a known calibration current at the load and determining actual current values by the difference in measured values between when the known calibration current is applied and when it is not applied. The accurate current is determined at a known temperature and accurate temperature compensation is provided by a non-linear digital technique. Each phase of the multi-phase power regulator is individually calibrated so that balanced channels provide accurate power to the load. Also disclosed is a calibration method with minimal noise generation.

An echo cancellation device (ECD) comprises an echo canceller (EC) including a transfer function estimator (EST, H) and a subtractor (ADD) and a residual echo suppression device (G, ADD2). The residual echo suppression device (G) comprises a residual echo filter (G) having an adjustable filter function (g). This filter function (g) can be adapted to either remove from the subtractor output (TNE') the spectral characteristics relating to the reception signal (RFE) and / or to emphasize in the subtractor output signal (TNE') a background signal spectral content relating to the transmission signal (TNE). A noise generation means (NGM') can be provided at the output of the adaptable filter (G) for injecting a noise process in to the filter output signal (TNE') prior to a speech coding in a speech coder (COD). The noise process masks in the filter output signal a spectral content relating to the reception signal (RFE).

A flex-rigid wiring board has an insulative adhesive interposed between portions, lapping over each other, of the rigid and flexible substrates; and the interconnecting electrode pads on the rigid and flexible substrates are electrically connected to each other through a conductor lump penetrating the insulative adhesive, thereby providing lowered inductance in the high-frequency band, shortened signal-delay time, reduced noise generation due to signal reflected-wave, reduced drop impact, high connection reliability and high freedom of wire connection, and the wiring board can advantageously be manufactured with a reduced cost and a high yield.

The invention discloses an electric pressure cooker and a control method thereof and a readable storage medium. The electric pressure cooker comprises a central processing unit, a key module, a detection module, a temperature module and a pressure relief module, and the key module, the detection module, the temperature module and the pressure relief module are all in electrical connection with thecentral processing unit. The key module is used for receiving operating instructions of a user; the detection module is used for detecting internal temperature and / or pressure of the electric pressure cooker; the central processing unit is used for receiving information of the key module and the detection module and sending corresponding control instructions to the temperature control module andthe pressure relief module; the temperature control module is used for heating or cooling the electric pressure cooker according to the instructions of the central processing unit; the pressure reliefmodule is used for relieving pressure of the electric pressure cooker by exhausting according to the instructions of the central processing unit. Cooking smell dispersion and high noise generation during cooking can be avoided, and accordingly utilization demands of users in different places can be met, and user experience is improved.

A steel roof deck diaphragm to provide structural rigidity to a building wherein loads of varying intensity can cause movement of structural members, which tends to generate noise when two members rub or work against each other. Corrugated sheets of high tensile steel are supported from below and span the distance between purlins, the corrugated sheets having over-lapping side edges and end edges and upper and lower surfaces. Non-metallic strips of felt form spacers positioned between the over-lapping side edges and end edges to prevent generation of noise resulting from relative movement of the corrugated sheets.

Provided is a computer with a case and a plurality of parts, including heat generating components that generate heat when operated, installed in the case, wherein the case includes a plurality of plates, and heat generated by at least one of the heat generating components when operated is transmitted to at least one of the plates via a heat conduction unit, which connects the at least one of the heat generating parts and the plate, and externally dissipated from the case. The heat generating components mounted in the case can be noiselessly and efficiently cooled without a noise-generating cooling fan.

Gate switches can switch an amount of attenuation, and are set in a distributed manner on distribution lines and a trunk on subscribers' house side in a CATV transmission path having a tree structure with an optical node that follows a headend being taken as a starting point. An upstream-transmission-quality monitoring unit monitors an S / N ratio of an upstream signal obtained from an upstream port having the headend connected thereto to detect a decrease in upstream transmission quality based on a degree of decrease and a continuation state of an S / N ratio. When the upstream-transmission-quality monitoring unit detects a decrease in upstream transmission quality, a noise-generation-source searching unit performs a sequential switching control over the amount of attenuation at the gate switches provided on the CATV transmission path from upstream to downstream to search for a source of generation of upstream ingress noise.

The invention relates to a multi-parameter compound environment tester comprising a centrifuge for simulating a linear acceleration environment and an environment chamber arranged on the arm of the centrifuge, wherein the environment chamber is used for simulating a vibration acceleration environment, a noise environment, a temperature environment and an air pressure environment; a noise generation mechanism, a temperature control mechanism, a vibration generation mechanism, an air inlet and an air outlet are arranged in the environment chamber; the vibration generation mechanism comprises a test bench, a bench push rod and a corrective push rod fixed on the test bench, a supporting reed and a sensor; the chamber wall of a compound chamber is hermetically connected with the push rods; the bench push rod is connected with a vibration-bench moving coil; and the corrective push rod is connected with a corrective mechanism capable of preventing the vibration generation mechanism and the vibration-bench moving coil from excessively translating. The invention has the advantages of comprehensive simulation of work environment for devices, good test effect and high precision.

A method of controlling a motor-driven washing machine and a control system that controls a motor or any other components of the washing machine are disclosed. The method includes the steps of generating an interruption command for braking a motor in motion during a wash cycle, applying a phase-reversed voltage to a voltage input terminal of the motor in motion, and electrically shorting the input terminal of the motor for a predetermined period of time if a second phase-reversed voltage generated by the motor is higher than or equal to a critical voltage level. Using such method, a motor-clutch mechanism is prevented front generating a noise and from being damaged during a wash cycle.

A database has a plurality of entries and a plurality of attributes common to each entry, where each entry corresponds to an individual. A query is received from a querying entity query and is passed to the database, and an answer is received in response. An amount of noise is generated and added to the answer to result in an obscured answer, and the obscured answer is returned to the querying entity. The noise is normally distributed around zero with a particular variance. The variance R may be determined in accordance with R>8 T log2(T / δ) / ε2, where T is the permitted number of queries T, δ is the utter failure probability, and ε is the largest admissible increase in confidence. Thus, a level of protection of privacy is provided to each individual represented within the database. Example noise generation techniques, systems, and methods may be used for privacy preservation in such areas as k means, principal component analysis, statistical query learning models, and perceptron algorithms.

Systems and methods for measuring and controlling fluid flow include an orifice plate defining a variable opening. The orifice plate includes an outer assembly comprising a central opening and an inner assembly extending through the central opening. The flow device regulates high and very low volumes of fluid with precision, inexpensively, with superior acoustics, reduced energy, and simpler design. The high turndown device permits use at lower velocities, thereby reducing noise generation and eliminating need for sound-attenuating liners. The high rangeability device combines several part numbers into fewer parts, thereby streamlining product portfolios. In some cases, cost benefits associated with the flow device allow equipment to be scaled back 100:1 rather than 10:1, providing energy savings, fewer product variations, simple and more robust applications. The device meets new and old building fresh air, comfort and energy codes. The flow device can be engineered, selected, and sized without sophisticated software programs.

An apparatus for reducing gas turbine engine noise, such as noise generated by an aircraft gas turbine engine, comprises at least one and preferably a plurality of gas injectors for injecting gas such as high pressure engine bleed air, diverted core air, air obtained from a pressurized storage container or air obtained from a synthetic jet actuator into the area proximate to one or more engine nozzle portions, thereby disrupting the noise-generating gas streams generated by the engine exhaust and the travel of the airplane through the air. The apparatus is particularly useful for reducing engine noise during the takeoff period of aircraft flight.

A master and a slave stage of a flip-flop are each separately clocked with non-overlapping clock signals during scan mode to eliminate a data input scan mode multiplexer. Separate, non-overlapping clocking permits the elimination of hold violations in scan mode for scan mode flip flop chains, permitting the elimination of delay buffers in the scan mode data paths. Resulting application circuits have reduced circuit area, power consumption and noise generation. A clock generator for scan mode clocking is provided to obtain the separate, non-overlapping scan mode clocks. Scan mode clocks may be generated with a toggle flip flop, a pulse generator or a clock gating circuit.

In a device for establishing noise in a motor vehicle with a housing, which is divided by at least one sound transmission device into at least two spaces, of which one space is in connection via an inlet line with a gas-carrying part of an internal combustion engine of the vehicle and the other space is acoustically coupled, by means of an outlet line, to an interior space of the vehicle and / or to the space surrounding the vehicle. The outlet line has at least one branch area, from which at least two branch lines extend to different locations in the interior space of the vehicle and / or the space surrounding the vehicle.

A stator vane assembly for a turbomachine comprising a plurality of circumferentially arranged stator vanes (32), the axial position of the stator vanes (32) and / or the pitch angle circumferentially between adjacent stator vanes (32) is varied circumferentially around the stator vane assembly. The stator vane assembly reduces the pressure distortion upstream of the fan outlet stator vanes (32), reduces the circumferential pressure variation and this reduces blade forced response excitation, noise generation and aerodynamic losses.

In a device for establishing noise in a motor vehicle, comprising a housing which is divided by a sound transmission device into at least two spaces, of which one space is in communication with a gas-carrying part of an internal combustion engine arranged in the motor vehicle and the other space is acoustically coupled to an interior space of the motor vehicle via an outlet line, the outlet line is connected via a hollow rigid deflecting element to an interior space lining element, the rigid deflecting element being capable of transmitting forces applied thereto by the sound radiation to the interior space lining element.

A blended wing aircraft reduces forward, aft, and sideline flyover noise and heat energy by reflecting it upward using the wing and vertical stabilizers positioned just outboard of the engines. The engines are located on top of the wing and forward of the trailing edge of the wing with the aft portion of the engines located over the wing. The nozzle exit perimeter is increased and shaped to increase shear and create vortices to move noise generation over the wing to cause the noise to be reflected upward off the wing and upward off of the canted vertical stabilizers. Engine thrust reversers cause the forwardly mounted engine's thrust to be directed toward the front of the aircraft in such a way as to create a download forward of the main landing gear to also secure the front landing gear.

The invention provides a pipe-jacking construction method for small-diameter pipes. The pipe-jacking construction method includes the steps of surveying and paying off, working well and receiving well manufacturing, pipe-jacking device mounting, pilot drilling, reaming, pipe pulling, other pipe construction in sequence, pipe-jacking device dismounting, pipe head handling and inspection well and cable channel construction. By the pipe-jacking construction method, excavation volume is low, slurry discharging is less, roads are not destroyed, and comprehensive cost is low; construction can be performed all through the year, construction speed is high, project circle is short, construction of an overall design project can be quickened, and working efficiency can be improved; traffic interference is minimized, and normal conditions of traffic in a construction site are guaranteed; environmental pollution like noises and dust cannot be generated, urban environment protection and stability, optimal design of the total planning and engineering construction of the urban construction can be benefited, and urban modern planning programming and construction level can be beneficially improved.

A portable communication terminal apparatus is disclosed which can announce termination of a call in various methods with a simple configuration and allows selection of a suitable annunciation method in accordance with a utilization situation of the portable communication terminal apparatus so that an annunciation operation can be performed appropriately thereby achieve reduction of the power consumption and the noise generation. An unfolded / folded state of a body of a foldable portable telephone set is supervised by an unfolded / folded state detection section. When an annunciation operation is to be performed upon termination of a call or the like, an annunciation method determination section selects one of a plurality annunciation methods stored in a storage section in response to the unfolded / folded state of the portable telephone set. A control section controls an annunciation section to drive a vibrator, a speaker or an LED to perform an annunciation operation in accordance with the selected annunciation method.

There is provided drug delivery devices comprising a drug container assembly with a needle and automatic needle insertion and drug delivery mechanisms. Aspects of the devices described include a noise-generation mechanism to indicate the completion of drug delivery, a mechanism for triggering drug delivery following needle insertion, front-end activation of the device and a safety mechanism for covering the needle after use and methods of assembly of the devices.

This invention relates to contact voltage energy saving controller in power electrical technique field, which comprises rectification circuit, switch circuit, afterglow loop, start loop, PWM control loop, voltage shortage protective loop and power loop set and solves the coil burnt problem when the regular contact is over large on control voltage.

A gas ejector capable of effectively dissipating heat generated from a heater while inhibiting noise generation as little as possible, an electronic device equipped with the gas ejector, and a gas-ejecting method are offered. A gas ejector (1) according to the present invention includes a vibrator (25) and ejects gas in a form of a pulsating flow such that vibration of the vibrator allows sound waves respectively generated upon ejection of the gas ejected from nozzles (23) and (24) to deaden out each other. Also, a control section (20) optimizes the frequency of the vibrator (25), hence, by increasing the gas ejection quantity as much as possible while inhibiting noise generation, heat of a heater is effectively dissipated.