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39 results about "Broad band noise" patented technology

Audio device with active noise cancellation

InactiveUS20060013408A1Effect of noise can be minimizedMinimize impactEar treatmentNoise generationAudio power amplifierWide band
An audio device with active noise cancellation (ANC) for coupling to a stereo headset is provided. The audio device comprises an audio processor and an analog ANC control module. The audio processor processes audio data for playback. It optionally can also comprise digital ANC function for tracking and canceling narrow band noise. The analog ANC control module actively cancels wide band noise in the stereo headset based on an audio feedback signal. The audio device further comprises a power amplifier and a feedback processor. The power amplifier is coupled to the output of the audio processor and the analog ANC control module. The power amplifier amplifies the output from the audio processor and the analog ANC control module and sends the amplified signal to the stereo headset. The feedback processor receives the noise from the stereo headset and generates an signal to the analog ANC control module.
Owner:FORTEMEDIA

Electronic earplug for monitoring and reducing wideband noise at the tympanic membrane

An electronic earplug for wideband control of pressures at the tympanic membrane is presented. A unique methodology of determining effective component placement inside an earplug that provides acoustic isolation between the ambient noise and tympanic membrane is explained. Methods for providing accurate dosimetry and improved active control result from the unique earplug design process, leading to very wideband active noise reduction at the tympanic membrane.
Owner:GENTEX CORP

Broad-band noise-reducing acoustic liner and its manufacture method

The invention discloses a line to decrease noise for Broad Band and manufacture method. The sound line has the noise elimination hole which is distributed randomly and the size is changed continuously. So it can decrease the noise of broad frequency noise. Because of whole forming, it can not generate the noise dispersion phenomena caused by the sound line joint to influence the noise decreasing effect. In process of Broad Band noise decreasing line, it can get the noise frequency and corresponding noise intension by value simulation of test and get the size range, changing interface and density of noise elimination hole; also it distributes the hole on the sound line basal board to have the good noise decreasing effect.
Owner:BEIHANG UNIV

Method, device and system for eliminating noises with multi-microphone array

To solve the problems with the prior art that a multi-microphone array cannot inhibit broad-band noises well and cannot be used in the increasingly widespread broad-band communication, embodiments of the present invention disclose a method, a device and a system for eliminating noises with multi-microphone array. The method according to an embodiment of the present invention comprises according to the number of different spacings between each of pairs of microphones of the multi-microphone array, dividing a full frequency band into the same number of sub-bands; decomposing signals of each of the pairs of microphones with the different spacings into a corresponding one of the sub-bands, wherein the larger the spacing between each pair of microphones is, the lower the frequencies of the sub-band into which the signals of the pair of microphones are decomposed will be; adaptively reducing the noises in the decomposed signals of each of the pairs of microphones with the different spacings in the corresponding sub-band to obtain noise-reduced signals for each of the sub-bands; and synthesizing the noise-reduced signals of each of the sub-bands to obtain a signal in which the noises have been reduced with the multi-microphone array in the full frequency band. The embodiments of the present invention can be used in scenarios of hands-free video calls.
Owner:WEIFANG GOERTEK MICROELECTRONICS CO LTD

Broad-band noise insulation honeycomb plate

ActiveCN106042468ABroaden the sound absorption bandMeet strength requirementsLayered productsHoneycombBroad band noise
The invention relates to a broad-band noise insulation honeycomb plate. The honeycomb plate is formed by sequentially bonding a first pore plate, a first honeycomb core, an elastic film, a second honeycomb core and a second pore plate, wherein a plurality of first cavities are distributed in the first honeycomb core; a plurality of second cavities in one-to-one correspondence to the first cavities are distributed in the second honeycomb core; first micro through pores communicating with the first cavities are distributed in the first pore plate; second micro through pores communicating with the second cavities are distributed in the second pore plate. The honeycomb plate can meet the light-weight requirement and can also insulate broad-band noises.
Owner:CHONGQING CHANGAN AUTOMOBILE CO LTD

Water surface target radiation noise simulation method

The invention relates to a water surface target radiation noise simulation method. The method includes the steps that an original value of a parameter needed in input radiation noise simulation according to a scene to be simulated; according to the scene to be simulated, a specific-frequency response filter for simulating continuous spectrum components are divided into sub filters, and central frequency points and a filter attenuation coefficient of each sub filter are updated; a random copy of wide-band noise is generated; according to the original value of the parameter, line spectrum components of noise to be simulated are generated; the random copy of the wide-band noise generates continuous spectrum signals through the specific-frequency response filter; interference signals are generated; line spectrum signals, the continuous spectrum signals and the interference signals are overlapped to obtain water surface target radiation noise to be simulated. According to the water surface target radiation noise simulation method, when the water surface target radiation noise is simulated, dynamic characteristics in line spectrum noise are taken into account, so that the noise simulated through the method is more comprehensive.
Owner:INST OF ACOUSTICS CHINESE ACAD OF SCI

Method and system for unambiguous angle resolution of a sparse wide-band antenna array

The present inventive concept for bistatic or monostatic radar utilization discloses a method and a system for unambiguous angle resolution of a sparse wide-band array antenna by utilizing an ultra wide-band signal, generally a wide-band noise signal which may be continuous bandwidth limited white or colored noise. The noise signal is typically generated and radiated by a transmitting antenna covering the entire reception range of a receiving sparse antenna array. An echo signal is received by the sparse receiving array containing n antenna elements, which are generally positioned with separation distances of several wavelengths without creating strong grating lobes due to the type of generated transmit signal. By means of a selected auto-correlation function defining the wide-band noise signal power spectrum, the convolution of the radiated output signal and the received echo input signal will give the target range information, the individual time-delay setting for each antenna element will give an unambiguous angular resolution.
Owner:TELEFON AB LM ERICSSON (PUBL)

Air Conditioner

In an air conditioner, reverse inhalation is prevented while broad band noise and wind sound are reduced.There are provided a projection 12b arranged at the leading end of a stabilizer 12 on the downstream side of an air stream F flowing along a surface 12a of the stabilizer opposing an impeller so as to protrude toward the impeller to define the shortest distance to the impeller, and a plurality of grooves 12e or projections provided on the opposing surface on the upstream side of the projection 12b so as to disturb the air stream flowing along the opposing surface 12a. The positions of the grooves 12e or the projections are arranged apart in a rotational axis direction E. A plurality of convex portions are provided so as to disturb an air stream flowing along a surface of a casing opposing the impeller, and the positions of the convex portions are arranged apart in the rotational axis direction of the impeller.
Owner:MITSUBISHI ELECTRIC CORP

Sound-insulating environment-friendly material used for decoration and production method of sound-insulating environment-friendly material used for decoration

The invention discloses a sound-insulating environment-friendly material used for decoration and a production method of the sound-insulating environment-friendly material used for decoration. The sound-insulating environment-friendly material comprises a hard sound-insulating layer, a sound-absorbing layer and a protective layer, wherein the sound-absorbing layer is arranged between the hard sound-insulating layer and the protective layer, the hard sound-insulating layer is arranged on the face opposite to an internal space, the protective layer is arranged on the face close to the internal space, and lamination bulges are arranged on the hard sound-insulating layer, so that effects on an external space are reduced, and the lamination bulges can reduce resonance between a wall and the hardsound-insulating layer; and the sound-absorbing layer comprises two layers of foamed polypropylene thin layers and a lamination fiber layer arranged between the two layers of foamed polypropylene thin layers, the protective layer is a foamed polypropylene sheet, and the lamination fiber layer is provided with winding small holes which communicate, thus a good effect of attenuating high-frequencynoise can be achieved, and closed hole structures of the foamed polypropylene sheet can insulate noise from low and medium frequency to medium and high frequency, so that broad-band noise is insulatedand absorbed.
Owner:深圳市集洁号环保科技有限公司

A method and device for communication in the digital user line technology

The present invention discloses a method for communication in digital user line techniques. Said method comprises the following steps: obtaining communication performances parameters; a first transmit-receiver device and a second transmit-receiver device performing communications by adopting preconcerted communication rules after the communication performances parameters having reached or exceeding preconcerted values, wherein the preconcerted communication rules are respectively set at the first transmit-receiver device and the second transmit-receiver device. The present invention also discloses a transmit-receiver device for communication in digital user line techniques. According to the present invention, bit tables and gains tables are preconcerted in advance and then stored respectively at the first transmit-receiver device and the second transmit-receiver device. When large broad band noises (such as crosstalk) occur, a quick switching between the bit tables and the gains tables determined in advance is available by utilizing simple message or inquiring-replying mechanism. Since exchanging of bit tables and gains tables is not necessary, the technical scheme in accordance with the present invention is characterized in its quick switching velocity and high reliability. Furthermore, the present invention can improve the spectrum efficiency.
Owner:HUAWEI TECH CO LTD

Silencer of rotary compressor

A silencer for rotation-type compressor is composed of an internal silencer with the exhaust space for the gas as cold medium of compressing chamber and mounted to main bearing of crankshaft, and an external silencer with the exhaust space for the gas as cold medium of internal silencer and mounted above the internal silencer. It can reduce the broad-band noise and particular-frequency noise and prevent the increasement in input pressure of compressor.
Owner:LG ELECTRONICS (TIANJIN) APPLIANCES CO LTD

Cdma signal generator using an awgn generator and a saw filter

There is provided a CDMA generator using an AWGN generator and a SAW filter. The CDMA generator according to the present invention comprises (1) an additive white Gaussian noise generator for generating a first broad band noise in an RF receiving band, (2) a first signal generator for generating a first conversion frequency signal, (3) a first mixer for mixing the first broad band noise in the RF receiving band with the first conversion frequency signal to provide a second broad band noise in an IF band, the IF band including a CDMA band and a remaining frequency band that is exclusive of the CDMA band, (4) a SAW filter for attenuating a third broad band noise in the remaining frequency band within the IF band to a predetermined level to provide a substantially CDMA band noise, (5) a second signal generator for generating a second conversion frequency signal, and (6) a second mixer for mixing the substantially CDMA band noise from the SAW filter with the second conversion frequency signal from the second signal generator to provide an output, wherein the output is usable as a test input signal to an RF block unit.
Owner:TRANSPACIFIC SONIC

Kitchen ventilator with flow guide component having noise filtration function

A kitchen ventilator with a flow guide component having a noise filtration function comprises a kitchen ventilator body and the flow guide component capable of eliminating noise. The flow guide component is assembled into the kitchen ventilator body. A plurality of through holes for eliminating the noise are distributed in the flow guide component. The kitchen ventilator has the advantages that internal space of the kitchen ventilator can be utilized effectively, minimized dimensional design can be realized, and overall weight can be reduced; the noise can be reduced at or near a noise source,namely a fan; the specific single-frequency or wide-band noise reduction is implemented by adjusting combination of the diameters of the different through holes, minimum distances between the edges of the adjacent through holes, or regional distribution of the through holes of a volute; the kitchen ventilator has the advantages of low cost and high reliability; the specific single-frequency noiseor wide-band noise can be reduced effectively, the noise-reduction frequency range is wide, and the multi-frequency noise can be reduced.
Owner:FOSHAN VIOMI ELECTRICAL TECH +1

Noise reduction processing method and device, equipment, storage medium and program

ActiveCN113242491AEliminate narrowband noiseEliminate broadband noiseHearing device active noise cancellationSound producing devicesEnvironmental noiseEar Auricle
The invention provides a noise reduction processing method and device, equipment, a storage medium and a program, and the method comprises the steps: obtaining a first noise signal (namely, a broadband noise signal) in an auricle external environment collected by a first microphone, and carrying out the filtering processing of the first noise signal through a feed-forward filter, and generating a second noise signal (namely a narrow-band noise signal) corresponding to the external environment of the auricle, filtering the second noise signal through a notch filter to obtain a second filtered signal, and further performing noise reduction processing on the noise reduction earphone according to the first filtered signal and the second filtered signal. Through the above process, the noise reduction earphone not only can eliminate broadband noise in the external environment of the auricle, but also can eliminate narrowband noise in the external environment of the auricle, so that the noise reduction effect can be ensured even in a scene with complex environmental noise.
Owner:SPREADTRUM COMM (SHANGHAI) CO LTD

Noise parameter extraction method

A wideband four noise parameter extraction method uses randomly distributed source states; the data are collected using wideband electro-mechanical tuners and noise and small signal receivers (network analyzers) in fast frequency sweeps; because of the random nature of source impedances reliable noise parameter values are extracted using selected source admittance states, distinctly regrouped in a cluster around the reflection factor associated with the optimum noise figure Fmin and a cluster located anti-diametric to it for determining the equivalent noise resistance Rn. Multiple noise parameter extractions for all possible cross-combinations of source impedance states in each cluster at each measured frequency allows reliable and physically meaningful generation of wideband noise parameters, even for very low noise and potentially unstable DUT's.
Owner:TSIRONIS CHRISTOS

Fan and microwave oven

The invention discloses a fan and a microwave oven. The fan comprises a hub (22) and multiple blades (22) which are arranged at intervals in the circumferential direction of an outer ring (211) of thehub (21), the blade thickness of the blade-shaped cross section of the blades (22) is gradually reduced from leading edges (223) to tailing edges (224) of the blades, and the blade-shaped cross section is cut out from a radial concentric circle of the outer ring (211) of the hub (21). Therefore, the fan has large stall margin, even if the incoming flow of the inlet blast capacity is high incidence, the separation of boundary layers still cannot occur on the blades, thus generation of stall is avoided, and normal work can still be conducted. Meanwhile, the fan has higher adaptability to the inlet incoming flow, the aerodynamic performance of the fan is better, the blast capacity is larger, and the efficiency is higher. Besides, due to the design of sharp angles of trailing edges of the blades, the tails of the blades are a series of fragmentized small vortex structures, the generation of high broad-band noise is avoided, and thus a certain noise-reduction effect is achieved.
Owner:GUANGDONG MIDEA KITCHEN APPLIANCES MFG CO LTD +1

Multifunctional communication waveform generation method

The invention discloses a multifunctional communication waveform generation method comprising the following steps of S1, randomly selecting starting frequency within a work frequency range of a multifunctional communication waveform, and generating a narrowband linear modulation waveform; S2, generating Gaussian white noise; S3, processing the generated Gaussian white noise by using a wideband band-pass filter to generate colored Gaussian noise; S4, modulating frequency of a sinusoidal wave by using the colored Gaussian noise, and generating a wideband noise frequency-modulated waveform; and S5, combining the narrowband linear modulation waveform generated in the step S1 with the wideband noise frequency-modulated waveform generated in the step S4 in a time domain to generate the multifunctional communication waveform. According to the method provided by the invention, the communication waveform part adopts the narrowband linear modulation waveform, and a central frequency point of a narrowband communication signal is randomly generated, so that the characteristic of being multifunctional is provided; the communication waveform is hidden in the noise waveform, so that hiding performance of the communication waveform is improved, and more safety and reliability during a signal communication process are ensured.
Owner:安徽省瑞鼎电子技术有限公司

Kitchen ventilator with multi-layer honeycomb noise filtration device

A kitchen ventilator with a multi-layer honeycomb noise filtration device comprises a kitchen ventilator body and the honeycomb noise filtration device capable of eliminating noise. The honeycomb noise filtration device is assembled in the kitchen ventilator body. A plurality of through holes for eliminating the noise are distributed in the honeycomb noise filtration device. The honeycomb noise filtration device is provided with a plurality of layers of honeycomb plates. The honeycomb plates are assembled in the kitchen ventilator body. The kitchen ventilator with the multi-layer honeycomb noise filtration device has the advantages that specific single-frequency noise or specific multi-frequency noise reduction is implemented by adjusting combination of the diameters of the different through holes, minimum distances between the edges of the adjacent through holes or the distance between the honeycomb noise filtration device and the kitchen ventilator body; the kitchen ventilator has the advantages of low cost and high reliability; the specific single-frequency noise or wide-band noise can be reduced effectively, the noise-reduction frequency range is wide, and the multi-frequency noise can be reduced.
Owner:FOSHAN VIOMI ELECTRICAL TECH +1

Am/fm antenna performance in the presence of wide-band noise using tunable high-q structures

An AM / FM radio system for a vehicle that is selectively impedance matched to the particular tuned frequency of interest so that noise received by other frequencies does not affect the received signal. The radio system includes an HMI allowing a user to select an AM or FM radio station and a radio tuner responsive to a signal from the HMI identifying the selected radio station. The tuner tunes the radio system to the radio station, and provides a signal to the HMI identifying the radio station. The HMI places a message on a vehicle bus identifying the radio station that the radio tuner is tuned to. An antenna controller receives the message from the vehicle bus to selectively control an impedance matrix to provide impedance matching for the selected radio station frequency. The antenna controller also selectively tunes antenna radiating elements to the particular tuned frequency.
Owner:GM GLOBAL TECH OPERATIONS LLC +1

Kitchen ventilator with air bellow having noise filtration function

A kitchen ventilator with an air bellow having a noise filtration function comprises a kitchen ventilator body and the air bellow capable of eliminating multi-frequency noise. The air bellow is assembled into the kitchen ventilator body, and is arranged as a panel with a plurality of through holes for eliminating the multi-frequency noise. The kitchen ventilator has the advantages that internal space of the kitchen ventilator can be utilized effectively, minimized dimensional design can be realized, and overall weight can be reduced; the noise can be reduced at or near a noise source, namely afan; the multi-frequency noise reduction is implemented by adjusting combination of the diameters of the different through holes, minimum distances between the edges of the adjacent through holes, regional distribution of the through holes of the panel, or the distance between the air bellow and the kitchen ventilator body; the kitchen ventilator has the advantages of low cost and high reliability; narrow-band noise and wide-band noise can be reduced effectively.
Owner:FOSHAN VIOMI ELECTRICAL TECH +1

Method, device and system for eliminating noises with multi-microphone array

To solve the problems with the prior art that a multi-microphone array cannot inhibit broad-band noises well and cannot be used in the increasingly widespread broad-band communication, embodiments of the present invention disclose a method, a device and a system for eliminating noises with multi-microphone array. The method according to an embodiment of the present invention comprises according to the number of different spacings between each of pairs of microphones of the multi-microphone array, dividing a full frequency band into the same number of sub-bands; decomposing signals of each of the pairs of microphones with the different spacings into a corresponding one of the sub-bands, wherein the larger the spacing between each pair of microphones is, the lower the frequencies of the sub-band into which the signals of the pair of microphones are decomposed will be; adaptively reducing the noises in the decomposed signals of each of the pairs of microphones with the different spacings in the corresponding sub-band to obtain noise-reduced signals for each of the sub-bands; and synthesizing the noise-reduced signals of each of the sub-bands to obtain a signal in which the noises have been reduced with the multi-microphone array in the full frequency band. The embodiments of the present invention can be used in scenarios of hands-free video calls.
Owner:WEIFANG GOERTEK MICROELECTRONICS CO LTD

Wind shield for reducing noise and cooling fan with same

The invention relates to a wind shield for reducing noise and a cooling fan with the same. The wind shield comprises a base, a fan opening is formed in the base, and a ring is arranged around the fanopening; a resonance sound absorption structure is arranged on the inner side of the ring and comprises a hard plate with a plurality of holes and a sound absorption material; and the sound absorptionmaterial is fixed on the inner side of the ring and arranged between the hard plate and the inner side of the ring. According to the wind shield and the cooling fan, the hard plate with the pluralityof holes and the sound absorption material can form a plurality of Helmhz resonant cavities with different sound absorption frequencies, so that the sound absorption effect of the wind shield on thenoise with the frequency of hundreds to thousands of hertz is guaranteed, and the wide-band noise is reduced advantageously.
Owner:ZHENGZHOU YUTONG BUS CO LTD

A method and device for communication in the digital user line technology

The present invention discloses a method for communication in digital user line techniques. Said method comprises the following steps: obtaining communication performances parameters; a first transmit-receiver device and a second transmit-receiver device performing communications by adopting preconcerted communication rules after the communication performances parameters having reached or exceeding preconcerted values, wherein the preconcerted communication rules are respectively set at the first transmit-receiver device and the second transmit-receiver device. The present invention also discloses a transmit-receiver device for communication in digital user line techniques. According to the present invention, bit tables and gains tables are preconcerted in advance and then stored respectively at the first transmit-receiver device and the second transmit-receiver device. When large broad band noises (such as crosstalk) occur, a quick switching between the bit tables and the gains tables determined in advance is available by utilizing simple message or inquiring-replying mechanism. Since exchanging of bit tables and gains tables is not necessary, the technical scheme in accordance with the present invention is characterized in its quick switching velocity and high reliability. Furthermore, the present invention can improve the spectrum efficiency.
Owner:HUAWEI TECH CO LTD
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