141results about How to "Reduce disturbing noise" patented technology

A capacitance detecting circuit of a capacitive sensor having a plurality of column lines and a row line intersecting the column lines detects a change in capacitance at an intersection of a column line and a row line. The circuit includes a PN code generating unit for generating a code having orthogonality in time sequence to output the generated code as a column drive signal, a column line drive unit for driving a predetermined one of the column lines which are selected in response to the code, a capacitance detecting unit, connected to the row line, for detecting a voltage by converting a total sum of changes in capacitance at intersections of the selected column lines into the voltage to output the detected voltage, and a decode processing unit for performing a predetermined calculation on the detected voltage output from the capacitance detecting unit and the code to determine a voltage value responsive to the capacitance change at the intersection.

In a digital hearing aid device (1) frequency modification is employed above a lower spectral bound and in accordance with a compression factor. The frequency modification is dynamically adjusted in dependence on a sound environment analysis (10) or an end-user input (30), by modifying the frequency modification parameters such as a lower spectral bound and a compression factor. The adjustment can be based on an interpolation between predefined parameters. In certain sound environments, such as loud noise, own-voice and telephone conversations, frequency modification is reduced or switched off. The proposed solutions have the advantage that the occurrence of disturbing noise and of distortions of harmonic relationships at the end-user's ear is reduced and signal processing resources as well as battery resources are saved.

The invention discloses a wearable human body multiple physiological parameter acquiring device. The wearable human body multiple physiological parameter acquiring device comprises a wearable acquiring band and acquiring clothes, wherein the wearable acquiring band comprises a chest strap, shoulder straps, a waistband and a connecting band located on the chest. The chest strap, the waistband and the connecting band comprise an outer layer and a liner respectively, the chest strap is fixedly connected with the waistband through the connecting band, and the chest strap is fixedly connected with the shoulder straps. Sandwich layers between the outer layers and the liners of the chest strap, the waistband and the connecting band are provided with corresponding electrode buttons, the outer surfaces of the liners of the chest strap, the waistband and the connecting band are correspondingly provided with electrodes for acquiring electrocardiosignals or respiratory signals, and the outer surface of the liner of the chest strap is further provided with a first temperature sensor and a second temperature sensor which are used for acquiring human body temperature signals. The acquiring clothes comprises a pocket provided with an acquiring circuit, sleeve bands for measuring blood pressure and provided with air bags are fixed at the upper-limb positions of sleeves of the acquiring clothes, and the air bags are connected with a pressure sensor in a blood pressure signal interface circuit in the acquiring circuit through air guiding tubes.

A conference system including a microphone array unit having a plurality of microphone capsules arranged in or on a board mountable on or in a ceiling of a conference room. The microphone array unit has a steerable beam and a maximum detection angle range. The conference system further includes a processing unit which is configured to receive the output signals of the microphone capsules and to steer the beam based on the received output signal of the microphone array unit. The processing unit is configured to control the microphone array to limit the detection angle range to exclude at least one predetermined exclusion sector in which a noise source is located.

A conference system including a microphone array unit having a plurality of microphone capsules arranged in or on a board mountable on or in a ceiling of a conference room. The microphone array unit has a steerable beam and a maximum detection angle range. The conference system further includes a processing unit which is configured to receive the output signals of the microphone capsules and to steer the beam based on the received output signal of the microphone array unit. The processing unit is configured to control the microphone array to limit the detection angle range to exclude at least one predetermined exclusion sector in which a noise source is located.

Disclosed is a passive optical network of code division multiple access using error correction code, which includes a plurality of optical networks units (ONU) and a central office, assigns a pseudo-noise (PN) code to each ONU, and transfers optical signals modulated by the PN code between the central office and each ONU, the passive optical network comprising the ONU which inserts error correction codes into upstream signals, transmits the upstream signals to the central office, and controls frequencies of the upstream signals using a response of the central office for the transmitted error correction codes and the central office which receives the upstream signals code division-encoded, decodes the upstream signals, inserts error counts of the error correction code included the upstream signals into downstream signals for the ONU, and transmits the downstream signals to the ONU.

A power closing latch device for a door or lid in a vehicle, which device comprises a claw, a pawl and a striker. The pawl meshes with a safety recess and a lock recess of the claw in a safety position and a locked position. The striker is provided in a groove and rotates together with the claw, at closing of the door or lid. A spring is provided acting on the claw, which spring keeps the claw in the safety position, when the door or lid is partially closed. An electric motor rotates the claw between the safety position and the closed position. An additional spring acting on the claw, which additional spring exert a counterforce on the claw to prevent the claw to stop in an undefined position, between the safety position and the closed position during a power closing process. A method for power closing of a door or lid of a vehicle is also provided.

A method for noise reduction in a hearing aid device is described, with a signal, which comprises a useful and an interference signal part, being processed in the hearing aid device and with the interference signal part being reduced to the benefit of the useful signal part and with the reduction of the interference signal part being carried out as a function of the input level of the signal, with the interference signal part being more heavily attenuated with a high input level than with a low input level.

An optical transmitter is of the reflective modulation type and has a means of generating reflection, a mixer for mixing a data stream and a sub-carrier, and an optical modulator for modulating an optical carrier with the output from the mixer in order to avoid optical beat-interference noise arising from, for example, Rayleigh backscattering. The modulator is in one embodiment of the interferometric type such as a Mach-Zehnder Modulator (MZM) operated to suppress the optical carrier at the transmitter output in order to reduce optical beat interference noise. The modulator preferably implements CSS-AMPSK modulation, which suppresses optical beat noise and achieves strong dispersion tolerance, enabling, for example, 10 Gb / s data transmission over 100 km distance without dispersion compensation. The transmitter may have a duobinary encoder, which encodes the data prior to mixing with the sub-carrier.

The invention provides an electric heating device. A radiating fin component comprises a flow-inlet surface adjacent to a connecting surface; and the flow-inlet surface of the radiating fin component is an inclined surface and is intersected with the central line of a heating pipe to form an inclined angle. The invention also provides an air conditioner. The electric heating device is positioned beside a bending position of an evaporator and is arranged in an air-inlet area of a ventilating device. Therefore, the structure of the radiating fin of the electric heating device is improved, the resistance of the electric heating device to air flow is reduced, the interference noise of the electric heating device to the air conditioner is reduced, meanwhile, rotary noise between a cross-flow blade of the ventilating device and the electric heating device is reduced, the total heating noise of the air conditioner is reduced by about 2dB (A), the noise performance of the air conditioner is improved, and the tone quality of the air conditioner during running is improved.

In a dynamic random access memory (DRAM), a step produced by forming a stacked capacitor can be prevented from being produced and increased, thereby facilitating the patterning of an upper layer (wiring, etc.). Further, the pattern layout can be made with freedom and the DRAM itself can be highly integrated. This dynamic random access memory is constructed such that stacked capacitors (C1), (C2) composed of accumulation node electrodes (7a), (7b), a dielectric layer (8) and a sub-plate electrode (9) are formed on the under layers of a switching element (Tr1) composed of a word line (4a) and two source-drain regions (5a), (5b) and a switching element (Tr2) composed of a word line (4b) and two source-drain regions (5a), (5c).

A method for noise reduction in a hearing aid device is described, with a signal, which comprises a useful and an interference signal part, being processed in the hearing aid device and with the interference signal part being reduced to the benefit of the useful signal part and with the reduction of the interference signal part being carried out as a function of the input level of the signal, with the interference signal part being more heavily attenuated with a high input level than with a low input level.

A discharge ionization current detector using a low-frequency dielectric barrier discharge with an improved S / N ratio is provided. A current detector 20 is disposed between an excitation high-voltage power source 8 and a discharge electrode 5 to detect a discharge current flowing in pulses due to plasma generation. The detection signal of the current detector 20 and an output signal from a current amplifier 18 for amplifying an ion current are inputted into an output extraction unit 21. The output extraction unit 21 detects a precipitous-rise portion of the discharge current detection signal and generates a trigger signal, and then extracts an ion current signal for a predetermined time period from the trigger signal. This can remove an influence of a noise appearing in a signal during a time period where no plasma emission is generated, thereby improving the S / N ratio of the detection signal.

In the invention, stator blades are arranged in such a manner that respective intervals between the adjacent stator blades (SV) become unequal at least partly. If the stator blades are arranged as mentioned above, there are formed wave fronts having different moving directions and phases, and these wave fronts are interfered with each other so as to be attenuated. Accordingly, an interference noise is reduced. Therefore, in accordance with the invention, it is possible to reduce an interference noise without enlarging a rotor stator blade interval as well as reducing a used amount of a sound absorption material.

In the invention, stator blades are arranged in such a manner that respective intervals between the adjacent stator blades (SV) become unequal at least partly. If the stator blades are arranged as mentioned above, there are formed wave fronts having different moving directions and phases, and these wave fronts are interfered with each other so as to be attenuated. Accordingly, an interference noise is reduced. Therefore, in accordance with the invention, it is possible to reduce an interference noise without enlarging a rotor stator blade interval as well as reducing a used amount of a sound absorption material.

The present invention relates to a fan wheel (11) for electrical machines, in particular for alternators of motor vehicles, with a fan disk (10) that, on its axially outwardly directed end face, has a number of fan blades (13, 18) distributed around the circumference in the shape of a circular ring, the fan blades extending away from the fan disk in the axial direction, so that cooling air beneath the fan blades can be drawn in axially and blown radially outwardly between air channels (20, 21) formed between them. One part (18) of each of the fan blades is joined in a fixed manner with the fan disk (10) via only its radially outward end section (18a), so that each inner end section (18b) is swiveled radially increasingly outwardly by a centrifugal force (22) occurring there as rotational speeds increase, to reduce the cooling air stream. To minimize not only the speed-dependent adaptation of the cooling air quantity to the cooling needs of the machine, but the flow noises as well, preferably only every second fan blade (18) is provided with an inner end section (18b) capable of being swiveled outwardly by centrifugal force (22), while the other, adjacent, first fan blades (13) are rigid along their entire length and are connected to the fan disk (10) in a fixed manner.

The invention relates to a method for restraining a rotor noise based on sweepback paddle tip openings and relates to a helicopter rotor. According to the method for restraining the rotor noise based on the sweepback paddle tip openings provided by the invention, the air flow at the front edge of a paddle is introduced to an end face of a paddle tip and the strength of the paddle tip eddy is weakened, so that the effect of reducing paddle-eddy interfering noise can be achieved. The opening quantity, opening size and interval are confirmed on the sweepback paddle tip; a connecting pipeline is designed; and the opening position is confirmed. The sweepback paddle tip has the advantages of delaying shock wave and reducing profile drag, so that the sweepback paddle tip is widely applied to the high-speed helicopter. A paddle tip opening scheme is provided, more air flow at the front edge of the airfoil can flow into the pipeline and the air flow is jet out along the direction vertical to the paddle tip, so that the strength of the paddle tip eddy is weakened and the paddle-eddy interfering noise is reduced. According to the method for restraining the rotor noise based on the sweepback paddle tip openings, the structure is simple, the realization is convenient, no additional complex control system is required, the noise-reducing effect is obvious and the method is a potential rotor noise restraining scheme.

The invention relates to a towing horizontal fishery detector, comprising a towing body, a towing rope, a multi-channel data acquisition unit, a signal processor and a terminal display, wherein two duplicate vector hydrophones are installed in the towing body with an X-direction parallelled with the direction of the towing body and a Y-direction perpendicular to the direction of the towing body; the towing rope is a multi-core bearing cable armored with TELFON; the vector hydrophones are connected with the multi-channel data acquisition unit via the towing rope; the multi-channel data acquisition unit comprises an analog signal pretreatment circuit and a data acquisition circuit that are integrally designed in an electronic cabinet; and the multi-channel data acquisition unit is connected with a computer. The invention integrates the novel vector hydrophone technique and modern signal processing technique to provide a passive type fishery detector, which has the advantages of low cost, stable performance, easy operation and good practicability.

The invention relates to an acoustic communication method and device, and belongs to the technical field of wireless communication. The method comprises the steps of: determining a first audio feature and a first target frequency point set corresponding to the current environment of a sending terminal; sending a first data transmission request to a server, wherein the first data transmission request includes the first audio feature and the first target frequency point set; modulating data to be sent by utilizing the first target frequency point set to generate an acoustic signal; and sending the acoustic signal. By means of the acoustic communication method and device disclosed by the invention, handshaking between the sending terminal and a receiving terminal before acoustic communication can be realized; therefore, the current available optimal frequency point set can be determined; interference noise in acoustic communication can be reduced; and the acoustic communication quality can be improved.

A domestic appliance includes an open air duct and a flow cross-section adjuster in the air duct for adjusting a flow cross-section of the air duct. The flow cross-section adjuster includes rotatably mounted blades for noise dampening purpose. The air duct and the flow cross-section adjuster are in a cooling air inflow region relative to a heat exchanger or a compressor of the domestic appliance.

A current source apparatus for reducing interference with noise is provided. The current source apparatus includes a controllable current source and a feedback controller. The controllable current source provides an output current according to a control signal and produces a feedback signal according to the output of the controllable current source. The feedback controller is coupled to the controllable current source for receiving the feedback signal, and the feedback controller adjusts the control signal based on the feedback signal and outputs the control signal for controlling the controllable current source to output a stable output current.

In one aspect, a noise suppression process for a decoded signal comprising a first decoded signal portion and a second decoded signal portion is provided. A first energy envelope generating curve and a second energy envelope generating curve of the first signal portion and of the second decoded signal portion are determined. An identification number depending on a comparison of the first and second energy envelope generating curves is formed. An amplification factor which depends on the identification number is derived. Multiplying the second decoded signal portion by the amplification factor, reduces pre-echo and post-echo interference noises.

The present invention provides a semiconductor device which makes it possible to reduce a disturbance noise generated to the gate or the gate drive circuit of the current-driven semiconductor device by the parasitic inductance, and to increase accuracy and stability of gate drive. The semiconductor device comprises: a semiconductor element which is current driven; a gate drive circuit which controls the semiconductor element and a connection terminal unit, wherein the semiconductor element includes: a gate electrode pad formed on a stacked structure of a nitride semiconductor layer; ohmic electrodes; the said connection terminal unit includes: a first ohmic electrode terminal (6) connected to the first ohmic electrode pad; a second ohmic electrode terminal (7) connected to the second ohmic electrode pad; a gate drive terminal (7) connected to the first ohmic electrode pad; and a gate terminal (8) connected to the gate electrode pad, an input terminal of the gate drive circuit is connected to the gate drive terminal, an output terminal of the gate drive circuit is connected to the gate terminal, and a potential of the first ohmic electrode pad corresponds to a reference potential of the gate drive circuit.

The invention discloses an electronic stethoscope with active noise reduction and auxiliary diagnosis functions, and relates to electronic stethoscopes. The electronic stethoscope comprises an auscultation head, an audio processing circuit, a liquid crystal display screen, a button, a microprocessor control circuit, earphones, a switch and an SD card. The auscultation head is provided with a built-in sound collection channel and a built-out sound collection channel. The input end of the audio processing circuit is connected with the built-in sound collection channel and the built-out sound collection channel of the auscultation head. The liquid crystal display screen is used for displaying the working state of the electronic stethoscope. The button is used for driving the electronic stethoscope to enter a recording mode. The output end of the microprocessor control circuit is connected with the input end of the audio processing circuit and the input end of the liquid crystal display screen. The input end of the microprocessor control circuit is connected with the button, the output end of the audio processing circuit and the output end of the liquid crystal display screen. The earphones are connected with the output end of the audio processing circuit. The switch is connected with a power source. The SD card is connected with the audio processing circuit and the microprocessor control circuit.

A refrigeration device includes a high-voltage electrical parts group having reactors and cooled elements, a low-voltage electrical parts group, a printed wiring board with the electrical parts groups mounted, and a refrigerant jacket that uses refrigerant flowing through the refrigerant circuit to cool the cooled elements. The high-voltage electrical parts group form an interleaved power supply circuit. The cooled elements are placed in an order conforming to a power supply path of the power supply circuit. The power supply circuit has a rectifier circuit, a power factor improvement circuit, smoothing capacitors, and an inverter circuit. The power factor improvement circuit has the reactors connected to each other in parallel and diodes and switching elements serving as the cooled elements connected to each of the reactors. The reactors are placed on an opposite side of the smoothing capacitors, with the diodes and the switching elements sandwiched in between.

The invention relates to a method for detecting a moving object in a stream of images taken at successive instants, of the type comprising, for each zone of a predefined set of zones of at least one pixel of the image constituting a current image, a step of determining whether the zone belongs to the moving object. The method also comprising a step of searching in at least one preceding image of the stream and along at least one predefined direction and orientation, for another zone determined as belonging to a moving object, and a step of negating the fact that said zone belongs to a moving object if the search is negative.

The invention discloses a noise-reduction distributed optical fiber hydrophone array technology based on rayleigh scattering. The sensor technology can eliminate the disturbance noise through a rayleigh scattering mechanism, an optical amplifier and self-modulation, thereby ensuring the obtaining of the complete underwater acoustic wave optical fiber change; the optical time domain reflecting positioning and optical phase change caused by the pressure effect on the optical fiber by the underwater acoustic wave caused by the external audio are analyzed to obtain information in the related underwater acoustic. Compared with the traditional piezoelectric hydrophone, the distributed optical fiber hydrophone array technology has the advantages of being high in detection sensitivity, and wide incorresponding underwater frequency band. On the aspect of use material, the optical fiber is used as the carrier to transmit and sense the information, the ultra-long distance transmission can be performed, and the transmission can be interfered by electromagnetism and is free from the leakage danger.

The invention discloses a laser radar and a transmitting module, a receiving module and a detection method thereof, the transmitting module of the laser radar comprises a plurality of lasers, the light emitting wavelengths of the lasers comprise a first wavelength and a second wavelength, and the lasers suitable for emitting light at the same time have different light emitting wavelengths; the receiving module of the laser radar comprises a plurality of detectors, and each detector is suitable for receiving an echo light beam, reflected by a target object, of a laser beam emitted by a corresponding laser in an emission module. By adopting the scheme, the anti-interference capability among a plurality of detectors can be improved, and the signal receiving performance of the laser radar canbe effectively guaranteed.

In an arrangement and method for active vibration compensation of an x-ray radiator, a counter-vibration generation unit is arranged within the x-ray radiator to reduce a vibration arising during operation of the x-ray radiator. The counter-vibration generating unit is engaged in an active connection with the x-ray radiator and generates a counter-vibration that is phase-shifted by 180 degrees relative to the operational vibration. Operational vibrations generated by the x-ray radiator can be directly reduced at the point of origin by the application of active counter-vibrations in the immediate proximity of the vibration generator. Additional vibration transmission to other system parts (for example a C-arm) is thereby reduced or prevented.