110results about "Active noise control" patented technology

Various implementations include road noise cancelation (RNC) systems and related approaches for RNC. Certain implementations include a RNC system having: a position sensor configured to detect a position of an occupant in a vehicle; a transducer configured to receive a cancelation signal and produce a cancelation audio signal in the vehicle; a microphone configured to provide an error signal representative of acoustic energy at a first location in the vehicle; a set of projection filters configured to filter the error signal to provide an estimated error signal at the position of the occupant in the vehicle, wherein the set of projection filters are selected from a predefined library of projection filters associated with a set of occupant positions in the vehicle; and an adaptive module that adjusts the cancelation signal based on the estimated error signal.

The invention relates to a system for semiconductor technology comprising at least one fluid channel (105) for a temperature control medium for temperature control of at least one component, e.g. a mirror (25, M4) of a projection exposure system (1) for photolithography. The system comprises at least two pressure fluctuation measuring devices (210) and a pressure surge sensor (220), arranged in series along the fluid channel (105) and connected to a control unit (230). The control unit (230) is configured to detect pressure fluctuations in the temperature control medium propagating from the pressure fluctuation measuring devices (210) towards the pressure surge sensor (220) from the signals of the pressure fluctuation measuring devices (210) and to control the pressure surge sensor (220) appropriately to generate destructive interference and reduce pressure fluctuations in the temperature control medium.

The present invention relates to an active noise reduction system including a cancellation sound generator configured to generate a cancellation sound for cancelling noise, an error detector configured to detect an error between the noise and the cancellation sound and generate an error signal corresponding to the error, and a controller configured to control the cancellation sound generator based on the error signal, wherein the controller is configured to extract noise components at a plurality of frequencies based on the error signal, determine a control target frequency among the plurality of frequencies based on the noise components at the plurality of frequencies, select a value of a prescribed control parameter based on the control target frequency, and generate a control signal to control the cancellation sound generator based on the selected value of the control parameter.

A vibration reduction unit and a transformer comprising same are disclosed. The vibration reduction unit according to one aspect of the present invention may comprise: a first frame forming one portion of the exterior thereof; a second frame which forms the other portion of the exterior thereof, and which is coupled to the first frame; a resonance space formed inside the second frame so as to reduce transmitted vibration or noise by means of resonance; and a pipe member penetratively coupled to the first frame such that the resonance space communicates with the outside.

The invention relates to a system for semiconductor technology, comprising at least one fluid channel (105) for a temperature control medium for controlling the temperature of at least one component, for example a mirror (25, M4) of a projection exposure system (1) for photolithography. The system comprises, along the fluid channel (105), at least two pressure fluctuation measuring devices (210) and a pressure surge generator (220), which are spaced apart from one another in series and are connected to a control apparatus (230), the fluid channel (105), between two adjacent pressure fluctuation measuring devices (210), at least partially comprising a wall made of elastic material (215). The control device (230) is designed to ascertain pressure fluctuations in the temperature control medium that move from the pressure fluctuation measuring devices (210) toward the pressure surge generator (220) from the signals from the pressure fluctuation measuring devices (210) and to control the pressure surge generator (220) appropriately in order to generate destructive interference for the purpose of reducing pressure fluctuations in the temperature control medium. (Figure 2)

A biodegradable sound-absorbing acoustic damping material and a method for producing the same are provided. The material comprises a mixture of dried seaweed powder, fine cellulose fiber raw materials, and water. The preparation of the material involves mixing all the components into a homogeneous paste, shaping the paste, and then dehydrating it to obtain a solid paste.

A method for rendering output audio via a wearable audio device is provided. The method includes: (1) generating an aware audio signal based on a playback audio signal and an environmental aware signal corresponding to a feedforward microphone; (2) filtering, via an adaptive filter, the aware audio signal to generate an adapted aware signal; (3) generating an acoustic driver signal based on the adapted aware signal and a feedback audio signal corresponding to a feedback microphone; and (4) rendering, via an acoustic driver, output audio based on the acoustic driver signal. The adaptive filter is configured to adapt based on the aware audio signal and the feedback audio signal.

A vibration reducing unit and a transformer comprising same are disclosed. A vibration reducing unit according to one aspect of the present invention comprises: a sound absorbing member accommodated in a filling space formed in a housing and configured to absorb vibration or noise generated inside the housing; and a cover member coupled to the housing, wherein the filling space is formed between a plurality of reinforcing ribs provided in the housing and extending in one direction, and the cover member is coupled to the reinforcing ribs, the filling space, and the sound absorbing member accommodated in the filling space while covering same from the outside.

A wind noise reduction system is provided, including a beamformer, a comparator, and an audio mixer. The beamformer may be an MVDR beamformer and generates a beamformed signal based on a first microphone signal and a second microphone signal. The comparator generates a comparison signal based on the beamformed signal and the wind microphone signal. The comparison signal may be further based on a beamformed energy level of the beamformed signal and a wind energy level of the wind microphone signal. The audio mixer generates an output audio signal based on the beamformed signal, the wind microphone signal, and the comparison signal. The wind noise reduction system may further include a wind microphone corresponding to the wind microphone signal. The wind microphone may be located in a portion of a wearable audio device configured to sit on the wearer's concha.

A setting method includes acquiring a plurality of instances of measurement data of an acoustic transfer function from a position of a loudspeaker to a position of a microphone, identifying a frequency band in which measurement variation of the acquired instances of measurement data is greater than a threshold value, and storing setting information in a storage of an active noise reduction device, the setting information being information for configuring the active noise reduction device with a setting that prevents output of the cancellation sound when noise corresponding to the identified frequency band is detected.

Some demonstrative embodiments include apparatuses, systems and / or methods of testing an acoustic device, an acoustic component, and / or a device or system including one or more acoustic devices. For example, an acoustic device tester may be configured to process input acoustic information of a tested acoustic device to determine a tested acoustic value distribution for the tested acoustic device in a plurality of frequency sub-bands; to determine whether or not the tested acoustic device meets a predefined testing criterion based on the tested acoustic value distribution and a reference profile defining a plurality of reference values corresponding to the plurality of frequency sub-bands, respectively; and to generate an output to indicate whether or not the tested acoustic device meets the predefined testing criterion.

A noise reduction system for actively compensating background noise in a noise reduction area in a transport area of a vehicle, the system includes a controller, at least one sensor detecting the background noise of the noise source, a sound generator generating anti-noise and at least one error-microphone to pick up background noise and anti-noise from the sound generator. The system includes sensors for detecting the background noise and are arranged at different positions in the vehicle, wherein each sensor generates a reference signal and the controller comprises a combination unit coupled to the sensors to receive the reference signals, the combination unit determines a virtual reference signal from the reference signals and is coupled to the dynamic adjustment unit in that the virtual reference signal is input to the anti-noise unit, for generating the anti-noise signal on a basis of the virtual reference signal.

This disclosure provides methods, devices, and systems for active noise control (ANC). The present implementations more specifically relate to filter adaptation techniques for recursively training an infinite impulse response (IIR) filter to convert a reference audio signal to an anti-noise signal. In some aspects, an ANC system may record, via a feedforward microphone, a reference audio signal representing external noise, and may further record, via a feedback microphone, an error signal representing residual noise resulting from passive attenuation of the external noise via a primary path between the microphones. The ANC system may further estimate an IIR filter that converts the reference audio signal to the error signal based on a secondary path. In some implementations, the ANC system may recursively update the IIR filter coefficients based, at least in part, on the coefficients associated with previous frames of the reference audio signal and the error signal.

To provide a noise reduction box equipped with a storage portion for storing a device inside of the opening / closing door, a box air intake port for taking outside air into the noise reduction box, a box exhaust port for exhausting air in the noise reduction box, and an exhaust duct in the housing for guiding exhaust air to the box exhaust port, wherein a device exhaust port of the device stored in the storage portion comes into close contact with an inlet of the exhaust duct when the opening / closing door is closed, and equipment solving the problems required for a portable device, such as small size and light weight, low noise, power saving, and exhaust heat at the same time.

A vehicle sound processing device includes a microphone configured to detect a sound wave signal including a voice signal, a road noise signal, and a media output signal in a vehicle. The vehicle sound processing device also includes a sensor unit installed in the vehicle to measure a vibration signal. The vehicle sound processing device additionally includes a processor configured to determine road surface noise using the voice signal and the vibration signal and determine a first sound wave correction signal by removing the road surface noise from the sound wave signal. The processor is also configured to determine a second sound wave correction signal by removing the media output signal from the first sound wave correction signal using source information of the media output signal.

A method and apparatus comprising computer code configured to cause a processor or processors to obtain an audio signal from a channel of at least one microphone of a plurality of microphones, estimate a Kalman gain based on the audio signal, share the Kalman gain to a plurality of channels of other ones of the plurality of microphones, and output an AHS signal from the channel and the plurality of channels, wherein the AHS signal is a version of the audio signal in which acoustic howling noise of the audio signal is suppressed and target audio of the audio signal is sustained.

A harmonic cancellation system including a feedback sensor, a controller, and a speaker is provided. The feedback sensor is disposed within a cancellation zone within a cabin of a vehicle. The feedback sensor produces a feedback signal corresponding to audio within the cancellation zone. The controller is configured to produce a harmonic cancellation signal that, when transduced into an acoustic signal, reduces audible harmonics from a harmonic noise source at a harmonic frequency within the cancellation zone. The harmonic cancellation signal is adjusted according to a comparison of the feedback signal at the harmonic frequency to at least one of a saturation threshold or the feedback signal at one or more sideband frequencies offset from the harmonic frequency. The speaker is disposed within the cabin, receives the harmonic cancellation signal, and transduces the harmonic cancellation signal into an acoustic harmonic cancellation signal within the cancellation zone.

The present disclosure relates to the technical field of signal processing, and in particular to a whistling sound suppression method, an earphone, a storage medium and a computer program product. The method includes: obtaining an ambient audio signal, the ambient audio signal being a sound signal in a surrounding environment of an earphone; filtering the ambient audio signal according to a preset first filter group to obtain a first audio signal; obtaining an ear canal audio signal, the ear canal audio signal being a sound signal when the first audio signal propagates in an ear canal; and filtering a subsequently obtained ambient audio signal according to a preset second filter group to obtain a second audio signal in response to the ear canal audio signal meets a whistling condition. The present disclosure can effectively suppress the whistling sound.

An acoustic band-pass filter assembly includes an inlet, a microphone configured to receive acoustic energy from the inlet, and a plurality of resonator chambers disposed in series between the inlet and the microphone and configured to transmit acoustic energy between the inlet and the microphone. Each of the plurality of resonator chambers has a different cross-sectional area.

To provide an active noise reduction device capable of adjusting a parameter used for generating a cancel signal.SOLUTION: An active noise reduction device 40 includes: a signal processing part 41 which generates a cancel signal for outputting cancel sound for reducing noise in a space in a vehicle 50; and a communication part 42 for receiving a change request requesting that a parameter related to generation of the cancel signal be changed to a user-specified parameter which a user specifies. The signal processing part 41 generates the cancel signal by using the user-specified parameter based on the received change request.SELECTED DRAWING: Figure 1

[Problem] The problem addressed by the proposed technology is to provide a noise-cancelling headphone device which prevents deterioration in playback frequency characteristics in a high-frequency range while preventing a reduction in a noise component in a low-frequency range. [Solution] According to the proposed technology, the present invention is a noise-cancelling headphone device comprising: a speaker unit 4 comprising a dome-shaped diaphragm 2 having a centre dome 5 and a sub-dome 6; a microphone 31 which detects ambient noise entering the speaker unit; a baffle plate 17 on which the speaker unit is supported and which is provided with sound emission holes 20, 22 which emit playback sound emitted from the speaker unit; and a signal processing circuit which generates a noise cancellation signal generated on the basis of the ambient noise detected by the microphone, wherein an acoustic resistance member 35 is provided at a position opposite the sub-dome 6 of the dome-shaped diaphragm.

An acoustic signal processing method includes: obtaining sound data indicating a waveform of a reference sound; processing the sound data to change at least one of a frequency component, a phase, or an amplitude value of the waveform based on simulated information in which variation of a natural phenomenon is simulated; and outputting the processed sound data.

A method for improving the sound quality of a headphone is provided. The method comprises acquiring a first audio signal by a feed-forward microphone and acquiring a second audio signal by a feed-back microphone; and determining a scene type of a scene where the headphone is located based on the first audio signal. The method further comprises obtaining a target effect audio signal based on the scene type; and determining current spectrum relationship information between the first audio signal and the second audio signal, and target spectrum relationship information between the first audio signal and the target effect audio signal. The method also comprises adjusting filter parameters of the headphone according to the current spectrum relationship information and the target spectrum relationship information; and re-acquiring the second audio signal using the adjusted filter parameters.