186 results about "Internal noise" patented technology

Speakers deployed in a space and divided into groups associated with different zones produce a mix of sounds that create internal noise pollution and, combined with external noise, an unpleasant environment for occupants. The present invention contemplates sound systems and methods for creating personalized sound zones to address these and related problems.

A positive displacement supercharger includes a housing defining a rotor cavity with a pair of positive displacement rotors operative to carry air axially from an inlet end to an outlet in the cavity wall near an outlet end of the cavity. The outlet communicates with an outlet plenum partially defined by the cavity wall. The cavity wall includes a stiff portion defining a plurality of lightening recesses, such as a waffle pattern, limiting distortion of the wall by pulsations in the plenum. The recesses may be time and cost efficiently converted to Helmholtz tuners by covering the recesses with a cover plate, which may be perforated to include at least one tuning opening (perforation) into each tuning chamber (recess) and forming tuning volumes of the tuning chambers and their associated tuning openings effective to attenuate selected frequencies of pulsations in the plenum and thereby reduce undesired noise emanating from the air system of the supercharger.

Pneumatic tire and a method for manufacturing the same, wherein the pneumatic tire includes a porous sound-absorbing material adhered via a sealant layer to the inside surface of an inner liner, wherein the sealant layer comprises 100 to 400 parts by weight of polyisobutylene, 10 to 100 parts by weight of an inorganic additive and 1 to 15 parts by weight of a vulcanizing agent, with respect to 100 parts by weight of a butyl rubber; the pneumatic tire can reduce internal noise by distributing noise energy, causing generation of resonance in the tire, or changing the generated frequency without a risk of shear deformation generated between the sound-absorbing material and the tire.

A new apparatus of pure digital medical amplifier used for clinical and non-clinical biomedical signal acquisition purposes is disclosed, which include: multiple single-stage amplification buffers connected to biomedical signal inputs for receiving and buffering various biomedical and reference signals, one or more high resolution analog-to-digital converter whose analog inputs connected to the output of said buffers for digitizing biomedical signals, one or more digital signal controller whose inputs/outputs are connected to said buffers and analog-to-digital converters for receiving the digitized biomedical signal data and controlling the processing and output of said digitized biomedical signal data according to preset control program or user's commands. By real-time or non-real-time method said digital signal controller does the following signal processing on the digitized biomedical signal data: filtering, compressing, decompressing, encoding, decoding, transferring, storing and retrieving, analyzing, and displaying the required said digitized biomedical signal data. This invention of amplifier requires only a few electronic components, and yields extremely low internal noise, extremely low distortion of analog output, extremely high external noise rejection and immunity, extremely high flexibility in filtering frequency setting for various biomedical signals.

The invention discloses full automatic dismantling equipment and method for a power battery. The equipment comprises a rack, a feeding mechanism, a battery three-surface annular cutting mechanism, a battery dismantling mechanism, a battery conveying mechanism, a feeding cabin and a discharging cabin, wherein the feeding mechanism is used for clamping the power battery from the feeding cabin and conveying the power battery to the battery three-surface annular cutting mechanism; the battery three-surface annular cutting mechanism is used for performing joint cutting on the bottom, the upper and lower side surfaces of the battery and cutting on the head of the battery; then the battery dismantling mechanism competes separation of a battery shell and a cell; and finally, a discharging procedure is completed by the discharging cabin. A series of automatic technological processes of automatic feeding, joint cutting, cutting, separating, conveying, discharging and the like of the power battery are realized; meanwhile, the equipment is equipped with a dust removal apparatus and a purifying apparatus to realize dust removal and waste gas collection in the whole technological process; and in addition, the equipment is covered with a full-closed type protective outer cover, so that internal noise and dust of the equipment can be effectively isolated, and safety of an operator and the equipment can be protected.

The invention relates to a noise cancelling bluetooth headset, in particular to a noise cancelling bluetooth headset which is relatively good in noise cancelling effect and convenient to use, and overcomes the defects that the conventional headset is difficult to be switched in wired/wireless transmission ways at any moment, and poor in music quality. The invention provides the noise cancelling bluetooth headset which can realize the automatic wired/wireless switch, and is relatively good in audio playback effect. In the noise cancelling bluetooth headset, a physical noise cancelling structure and an internal noise cancelling circuit are respectively adopted to process noise inside and outside the headset, the physical noise cancelling structure is used for isolating external high frequency noise, and meanwhile, the internal noise cancelling circuit is used for eliminating internal noise during the transmission process of the low and medium frequency noise and audio signals entering the headset, so that the audio signal entering the human ears finally is not affected by noise completely.

The invention provides a synthetic aperture radiometer visibility phase error correction method based on array rotation. The method comprises the following steps of: rotating an antenna array by 180 DEG so that radiation signals of a tested scene are respectively received by the antenna array before and after rotation; establishing an equation set by using the characteristic that the antenna array element phase error does not change along with array rotation, simultaneously solving the equation set to obtain the antenna array element phase error, and further correcting the visibility according to the antenna array element phase error. The method does not rely on additional internal noise injection networks and external auxiliary sources, the array element phase error of synthetic apertureradiometer visibility can be corrected by using the observation scene per se, and the complexity of the traditional synthetic aperture radiometer correction system is effectively reduced.

The invention provides a noise reduction method and apparatus for a household appliance, aiming at poor effects of suppressing noise of household appliances in the prior art. The method herein includes the following steps: acquiring a first noise signal which is acquired by a first voice acquiring apparatus which is disposed at a noise origin inside a household appliance and a second noise signal which is acquired by a second voice acquiring apparatus which is disposed on the household appliance and distant from the noise origin inside the household appliance; based on the correlation between the first noise signal and the second noise signal, removing the effects on the first noise signal by ambient noise signals, acquiring a first expected noise signal of the household appliance; based on the first expected noise signal, generating a noise offsetting signal; and outputting the noise offsetting signal. The technical solution can accurately offset internal noise of the household appliance.

The invention discloses an amblyopia treatment system. Through the functions of visual functional evaluation and visual perception study training which are conducted on the two eyes of an amblyopia patient, input signals of the two eyes can be changed; under the circumstance, the visual functions such as the relative contrast sensitivity, the relative internal noise, the relative reaction time and the relative brightness sensitivity of the two eyes can be measured, the input signals of the two eyes are adjusted, different and matched pattern stimuli are supplied to the two eyes, the visual perception study training is conducted, and therefore the visual function treatment effect of amblyopia is effectively improved.

The invention provides a volume adjusting method for a household electrical appliance in an intelligent household and a system. The method mainly comprises the following steps: a noise sensor and a household gateway are set in the intelligent household; the noise sensor transmits sensed noise information to the household gateway through a wireless communication network; the household gateway compares the noise information with a noise threshold value which has been stored in advance; and according to a comparison result, adjusting is carried out on the volume of a program played by the household electrical appliance in the intelligent household. According to the embodiment of the invention, accurate sensing and corresponding control of household internal noises can be guaranteed, and automatic adjusting of the volume of the household electrical appliance can be realized, so that a user can experience real intelligent control in the intelligent household, and the intelligent household system has better populist practicality.

The invention discloses a general purpose programmable digit filter and working method, which is characterized by the following: the invention is composed of 9 functional modulars; the working method consists of two working methods: allocation method and filtering duty; the invention improves the stability, anti-interference ability and accuracy and avoids internal noise of electric filter system effecting the filtering signal; the invention uses many hardware multiplicators and accumulators to realize filtering calculation, which improves the response real-time ability.

The invention relates to a vehicular volume control system which comprises an external noise detection module, an internal noise detection module and a volume controller module. The external noise detection module and the internal noise detection module respectively detect noise of an external environment of a vehicle and noise of an internal environment of the vehicle, and the volume controller module is connected with the external noise detection module and the internal noise detection module to determine the volume of an external loudspeaker of the vehicle and the volume of an audio loudspeaker of the vehicle according to detection results of the external noise detection module and the internal noise detection module. The vehicular volume control system has the advantages that the volume of the external loudspeaker of the vehicle and the volume of the audio loudspeaker of the vehicle can be adaptively modified in real time according to detection results of the noise of the internal environment of the vehicle and the noise of the external environment of the vehicle, and problems that pedestrians cannot hear reminding sound of the loudspeaker due to the noise and a driver of the vehicle cannot hear sound of incoming calls of a mobile phone due to the noise are solved.

A programmable impedance controller and a method of operating prevent or substantially reduce internal noise and an influence from external noise lasting for a long time. The programmable impedance controller for comparing a pad voltage of a pad connected to an external determination impedance with a reference voltage, and for outputting an impedance control signal, and for performing a digital coding to an impedance code corresponding to the impedance control signal, includes a clock controller and a counter. The clock controller outputs a first clock signal in a reset mode and outputs a second clock signal in an operating mode, in response to an applied clock signal. The counter sequentially updates code data, one code step per clock period, in response to the first clock signal in the reset mode, and outputs update code data. In an operating mode, the counter outputs the update code data updated in the reset mode in response to the second clock signal.

The invention discloses an active control noise reduction system and method for automobile engine noise. The active control noise reduction system includes: a vehicle information recognition system for receiving signals of the rotation speed of an engine, vehicle doors, vehicle windows, the temperature and humidity of the interior and the exterior of the vehicle, and an entertainment system in vehicle CAN network communication, determining the state of a vehicle, and completing initial monitoring; an active control sounding system for real-time self-adaption control calculation, sending a plurality of control signals to an automobile loudspeaker system, controlling a loudspeaker to send sound waves having the corresponding frequency, phase and energy, and achieving active control noise elimination of the interior of the vehicle; a vehicle internal environment monitoring system for monitoring sound energy of all key points in the vehicle in real time, feeding a sound energy signal as aninput signal back to the active control sounding system as a reference signal, and monitoring vehicle internal noise change in real time. The active control noise reduction method is shown in description. The active control method can reduce interference of engine noise to passengers in the vehicle, and the vehicle internal sound quality of the automobile can be improved.

The invention provides a headset, particularly relates to a 5.1 sound track Bluetooth noise cancelling headset capable of outputting through 5.1 sound tracks and effectively cancelling external noise and internal noise, and aims to solve the technical problems that the conventional headset cannot realize 5.1 sound track outputting and wireless transmission and is easy to be impacted by noise. The 5.1 sound track Bluetooth noise cancelling headset provided by the invention operates in such a manner that an ordinary audio signal is decoded through a decoding chip, and then simulated to a front left sound track audio signal, a front right sound track audio signal, a central sound track audio signal, an extra bass audio signal, a left surround audio signal and a right surround audio signal; all of the audio signals can be played through corresponding speakers in sounding bodies of a left headset main body and a right headset main body. Moreover, the 5.1 sound track Bluetooth noise cancelling headset adopts a physical noise cancelling structure and an internal noise cancelling circuit to treat the internal noise and external noise of the headset respectively, so that the effect of 5.1 sound track audio entering human ears finally can be optimum.

A microphone microchip for a voice communication device. The microchip receives and processes an audio signal from a microphone. The microchip incorporates an RF filter that substantially attenuates noise signals at RF frequencies, while passing audio signals, substantially unattenuated. The filter is inserted between ports through which RF carrier signal noise can enter the microchip and internal elements of the microchip that provide a nonlinear response. Thus, modulated RF carrier noise is attenuated before this noise can interact with the nonlinear elements to convert the modulated carrier noise to audible interference. Corruption of microphone signals is thereby avoided.

A method of evaluating a device includes a first electric circuit acting as a noise source and a second electric circuit which is likely to malfunction due to a noise signal. The method includes: obtaining malfunction frequency characteristics indicating magnitudes of a threshold noise signal causing malfunction of the second electric circuit; obtaining internal noise arrival frequency characteristics indicating magnitudes of an internal noise signal arriving at the second electric circuit from the first electric circuit; and comparing the malfunction frequency characteristics with the internal noise arrival frequency characteristics.

The invention relates to a cab design method based on a cab sound reduction index analysis. The cab design method comprises the following steps: (1) establishing a CAD (Computer-Aided Design) model of a cab assembly, carrying out mesh generation on the CAD model, and establishing a finite element model of the cab assembly; (2) based on the finite element model of the cab assembly, establishing a cab internal sound field and a cab external sound field; (3) according to the shape of a sealing strip in a current design drawing, establishing a finite element model of the sealing strip structure, and carrying out nonlinear static compression on the sealing strip according to a set amount of compression; (4) establishing a sound-solid-sound three-domain coupling model; (5) computing the sound reduction index of the cab; (6) judging whether the sound reduction index of the current cab meets the design requirement, if yes, taking the current design drawing as the final structure output of the cab, and otherwise modifying the shape and the amount of compression of the sealing strip in the design drawing, and returning to the step (3). Compared to the prior art, the cab design method disclosed by the invention has the advantages of reducing the internal noise of the cab, increasing the sound reduction index of the cab, improving the sealing performance, and the like.