879results about "Active noise control" patented technology

In aspects of ending audio playback based on a trigger word, a mobile device implements an audio playback manager that detects a headset in communication with a mobile device, the headset causing active noise cancellation (ANC) and outputting audio playback communicated from the mobile device. The audio playback manager detects a trigger word that is audible in an environment of the mobile device. In response to detecting the trigger word, the audio playback manager ends the audio playback and adjusts the ANC of the headset.

The invention discloses an intelligent noise reduction method and system based on a mine earphone, and the method comprises the following steps: S1, obtaining an original noise signal in a mine operation environment, and carrying out the preprocessing of the original noise signal; s2, designing an adaptive compensation mechanism according to the reflection characteristics of the closed space of the mine, calculating a sound wave propagation attenuation coefficient and reflection delay, constructing a roadway reverberation model, and generating advanced compensation sound waves; and S3, carrying out collaborative fusion on the advanced compensation sound wave and a main noise reduction signal to generate a composite noise reduction signal. The invention relates to the technical field of intelligent noise reduction. According to the intelligent noise reduction method and system based on the mine earphone, the noise level in a mine operation environment is effectively reduced, the communication efficiency and the working comfort of operators are improved, potential damage of noise to hearing of the operators is reduced, and therefore the overall safety and the production efficiency of mine operation are improved.

In aspects of presenting relevant audio data, a mobile device implements an audio playback manager that monitors audio in an environment for a trigger word. The audio playback manager detects the trigger word via a microphone associated with a headset in communication with a mobile device. The audio playback manager determines whether a portion of the audio preceding the trigger word is relevant to a user of the mobile device and presents the portion of the audio that is relevant to the user.

A refuse vehicle includes a body coupled at least one of the frame and the chassis, a battery configured to provide electrical power to a first motor, a vehicle body supported by the chassis and defining a receptacle for storing refuse therein, an electric power take-off system coupled to the vehicle body, the electric power take-off system including a second motor configured to convert electrical power received from the battery into hydraulic power, one or more microphones coupled to the body and configured to detect noise, one or more speakers coupled to the body configured to emit noise reducing sounds, and a controller configured to receive data related to the detected noise from the one or more microphones and cause the one or more speakers to emit the noise reducing sounds in response to the data received from the one or more microphones.

The invention belongs to the technical field of earphone noise reduction, and provides a noise reduction regulation and control method for an earphone and a noise reduction earphone. The method comprises the following steps: acquiring a first environment sound signal of an environment area, and extracting human voice features from the first environment sound signal to construct a human voice feature template library; in response to a noise reduction regulation and control instruction, collecting a second environment sound signal of the environment area, converting the time domain signal into a frequency domain signal through Fourier transform, and extracting a frequency spectrum feature from the frequency domain signal; performing matching calculation on the spectrum features and a human voice feature template library to determine environment voice signals, human voice signals and noise signals; an active noise reduction algorithm is adopted to generate offset sound waves opposite to the noise signals in phase, the human voice signals are amplified, and the offset sound waves and the amplified human voice signals are output through a loudspeaker of the earphone. According to the invention, effective noise filtering and clear transparent transmission of specific human voice are realized, smooth communication can be realized without taking off the earphone, and the use experience is improved.

Methods and systems are disclosed for a vehicle audio system including, in one example, a method for noise cancellation in a vehicle having a reference sensor configured to acquire a reference signal, a plurality of speakers configured to emit a noise cancellation signal, and a plurality of error microphones configured to acquire a residual signal. The method processes the reference signal with a time domain adaptive weight filter to produce the noise cancellation signal, estimates a frequency domain filtered virtual microphone signal from the noise cancellation signal and the residual signal, and a frequency domain filtered reference signal from the reference signal. The method decomposes the frequency domain filtered virtual microphone signal and the frequency domain filtered reference signal into a plurality of frequency domain subband signals, and updates the time domain adaptive weight filter based on a weight transformation of a plurality of frequency domain subband adaptive filter weights.

The invention discloses a noise reduction processing method and device, a vehicle and a storage medium, and relates to the technical field of intelligent cabins, and the method comprises the steps: carrying out the recognition based on an error signal and an accelerometer signal of the vehicle, and obtaining a noise scene where the vehicle is located; decomposing the accelerometer signal into a plurality of sub-band signals which are not overlapped with one another; for each sub-band signal, determining a noise reduction processing parameter corresponding to each sub-band signal based on the energy analysis and noise scene of the sub-band signal; based on the noise reduction processing parameter corresponding to each sub-band signal, performing adaptive filtering on each sub-band signal in combination with the error signal to obtain a noise reduction signal corresponding to each sub-band signal; and carrying out fusion reconstruction on the noise reduction signals corresponding to the plurality of sub-band signals to obtain a full-band noise reduction signal. According to the invention, adaptive filtering and noise reduction are carried out on each sub-band signal based on the noise scene where the sub-band signal is located, efficient division and treatment and response can be carried out on complex and multi-spectral structure noise, the noise reduction effect is improved, and the vehicle use experience feeling of a user is further improved.

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.

A loudspeaker system includes a three-loudspeaker array and signal processing method for rendering and playing audio content in a listening environment. The three-loudspeaker array includes a left loudspeaker element, a center / height loudspeaker element, and a right loudspeaker element. A signal processor / renderer can be programmed or configured to process input audio content with a plurality of (e.g., at least five) playback channels (e.g., left, center, right, left elevation, and right elevation channels). The right loudspeaker can be driven by a right main signal and a right elevation-cancellation signal, and / or a combined signal thereof. The left loudspeaker can be driven by a left main signal and a left elevation-cancellation signal, and / or a combined signal thereof. The center / height loudspeaker can be driven by a combination of a center main signal and an elevation / height signal derived or rendered from the input audio signal.

An example vehicle audio system includes a vehicle speaker configured to generate audio, multiple microphones, and a vehicle control module configured to receive an input signal via the multiple microphones, split the input signal into a parallel domain signal and an orthogonal domain signal, select a constant step size value for an orthogonal domain filter weight and a variable step size value for a parallel domain filter weight, adapt the orthogonal domain filter weight according to the orthogonal domain signal and the constant step size value, adapt the parallel domain filter weight according to the parallel domain signal and the variable step size value, combine the adapted orthogonal domain filter weight and the adapted parallel domain filter weight to define a total filter weight, and apply the total filter weight to the received input signal to perform a signal processing operation on the received input signal.

Methods and systems are disclosed for an audio system for a vehicle system. In one example, a noise cancellation system includes a vehicle having a plurality of speakers and a plurality of microphones, a plurality of sensors, and a controller. The controller includes instructions stored on non-transitory memory that when executed cause the controller to generate a noise cancellation signal using a set of head-related impulse responses for the plurality of speakers and the plurality of microphones based on a head position of one or more occupants and a plurality of transfer functions, including to selectively update only a subset of the plurality of transfer functions responsive to the plurality of sensors detecting head movement greater than a threshold.

The invention relates to an active noise reduction device, an active noise reduction method and a range hood, and the active noise reduction device comprises a sound signal collection device which is used for collecting a noise signal; the controller is electrically connected with the sound signal acquisition device, and the controller is configured to generate a noise reduction signal for counteracting the noise signal according to the noise signal acquired by the sound signal acquisition device; the sound signal transmitting device is electrically connected with the controller and is used for transmitting a noise reduction signal; the device is characterized in that the sound signal transmitting device comprises a plurality of plasma loudspeakers which are circumferentially arranged around the noise source, and the plasma loudspeakers are configured to be capable of generating electric arcs through high-voltage electricity so as to drive air to produce sound through the vibration of the electric arcs. The active noise reduction device can be suitable for a complex noise environment, is slightly influenced by the environment and is low in complexity; and the discharge parameters of the plasma loudspeaker can be obtained through a noise reduction method so as to meet the real-time requirement of a dynamic noise environment, and the method is suitable for active noise control, sound field regulation and control and other scenes.

Various implementations include audio systems and related approaches for providing road noise cancelation (RNC). Certain implementations include a method of training a machine learning (ML) based road noise cancelation (RNC) system for a vehicle, the method including: providing inputs to the ML based RNC system, the inputs obtained from: a set of ear-mounted microphones on a user of the vehicle, at least one transducer, an accelerometer, a set of cabin microphones in the vehicle, and a controller area network (CAN) bus, wherein the inputs from the set of ear-mounted microphones on the user approximate detected road noise by the user; adapting a set of parameters defining noise cancelation signals in the ML based RNC system based on the inputs; and generating noise cancelation signals for output by the at least one transducer based on the adapted set of parameters.

Presented herein are techniques for reducing distortions in noise cancellation systems, including but not limited to body noise cancellation filtering systems. In one aspect, a method is provided. The method comprises: receiving at least one input signal at a noise cancellation system; and processing the at least one input signal using the noise cancellation system to generate a noise cancellation output signal, wherein the noise cancellation system is controlled by a variable filtering strength parameter that is a function of a level of the at least one input signal.

Provided is a soundproof material having excellent sound insulating properties in a wide frequency range of 200 to 2000 Hz while exhibiting sound absorption performance. The present invention relates to a soundproof material formed by the lamination of at least two layers, i.e., a nonwoven fabric A which is composed of fibers, and a porous body B which is a molded body having a porous structure. The soundproof material is characterized in that the nonwoven fabric A contains at least 1 mass% of fibrillated fibers.

The invention provides a filter coefficient determination method and device, electronic equipment and a storage medium, and the method comprises the steps: obtaining the filter coefficients of a plurality of sub-filters at a historical moment before a target moment, and for each sub-filter, determining the filter coefficients of the sub-filters at the historical moment according to the constraint information determined based on the filter coefficients of the sub-filters at the historical moment; determining error information of the sub-filters for performing echo cancellation on the input voice signal at the historical moment, determining filter coefficients of the sub-filters at the target moment according to the error information of the sub-filters for performing echo cancellation at the historical moment and the filter coefficients of the sub-filters, and determining the filter coefficients of the sub-filters at the target moment according to the filter coefficients of the sub-filters at the target moment. The target filter coefficient of the target filter at the target moment is determined, the coefficient of the target filter is determined according to the coefficient of the sub-filter obtained through decomposition of the target filter, constraint information is added when the coefficient of the sub-filter is estimated, the complexity of filter coefficient determination is reduced, and the convergence speed is increased.

Aspects of the disclosure relate to an audio hub that may be connected to a computing device. The audio hub may comprise multiple wired and wireless communication interfaces that may be used to interface multiple peripheral audio devices with the computing device. The audio hub may comprise a built-in reference microphone that may be used for noise cancelation, automatic gain control, and / or acoustic echo cancelation. The audio hub may additionally be configured for audio dosimetry measurements based on output audio signals as sent to an audio output device connected to the audio hub.

The invention discloses an online modeling and control method for a narrowband active noise control system, which comprises the following steps of: (1) performing frequency estimation on a signal picked up by a reference microphone by using a triangular cascade adaptive notch filter algorithm, and calculating an online estimated value of a signal-to-noise ratio by using energy of an input signal and an output signal of a notch filter; (2) when the online estimated value of the signal-to-noise ratio is larger than a preset value, modeling and control are started, a reference signal and auxiliary noise are generated based on the estimated frequency, and a control signal is calculated; (3) estimating auxiliary secondary sound by using the auxiliary noise; (4) estimating the sum of the primary sound and the secondary sound of the error signal at the noise frequency by using the reference signal; (5) updating the estimation of the frequency response of the secondary path at the auxiliary noise frequency and the frequency response of the auxiliary filter at the narrow-band noise frequency; (6) obtaining the estimation of the frequency response of the secondary path at the narrowband noise frequency in an interpolation mode; (7) updating the filter coefficient of the controller; and (8) outputting a control signal to drive a secondary source loudspeaker to produce sound, propagating the sound through a secondary path, and coherently superposing the sound with the initial noise signal at the error microphone to realize a noise reduction function. According to the method, the secondary path can be accurately modeled online, compared with an existing algorithm, the auxiliary noise energy is low, the convergence speed is high, the noise reduction effect is good, meanwhile, the problem that the same parameter operation results are different in a traditional auxiliary white noise online modeling algorithm is solved, and the algorithm stability is better.

Various implementations include a method of training a road noise cancelation (RNC) system for a vehicle, including: providing inputs to RNC system, the inputs obtained from: a set of ear-mounted microphones on a user, at least one transducer, an accelerometer, a set of cabin microphones in the vehicle, and a controller area network (CAN) bus, the inputs from the set of ear-mounted microphones on the user approximating a signal detected by the ears of the user; adapting a set of parameters in the RNC system defining an estimated signal detected at respective ears of the user based on the inputs; and generating at least one of the following for input during an operating mode of the RNC system: estimated ear microphone signals based on the adapted set of parameters, or a set of projection filters for use in determining an estimated ear signal at the respective ears of the user.

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.

An active noise reduction method and an active noise reduction earphone can improve the noise reduction effect of the active noise reduction earphone. The active noise reduction earphone comprises an in-ear microphone, an out-ear microphone, a loudspeaker and a filter. The method comprises: in the case that the loudspeaker plays audio data, determining a first primary path transfer function according to first out-ear data collected by the out-ear microphone and first in-ear data collected by the in-ear microphone; determining audio data received by the in-ear microphone according to the first in-ear data, the first out-ear data and the first primary path transfer function; determining a first secondary path transfer function according to the audio data played by the loudspeaker and the audio data received by the in-ear microphone; and updating a working coefficient of the filter to a first working coefficient according to the first primary path transfer function and / or the first secondary path transfer function.

The invention provides a Helmholtz silencer with broadband sound absorption performance, and belongs to the technical field of silencers. Comprising a tubular neck and a cylindrical back cavity, a plurality of annular thin plates are evenly arranged and fixed on the inner wall of the cylindrical back cavity in the length direction, the distance between every two adjacent annular thin plates is larger than 0 and smaller than 3 mm, and the inner diameters of the annular thin plates are gradually reduced from the tubular neck to the interior of the cylindrical back cavity. A plurality of annular thin plates are fixed in the cylindrical back cavity, so that a gap between two adjacent annular thin plates forms a sound absorption unit, and the inner diameters of the plurality of annular thin plates are gradually reduced from the tubular neck part to the interior of the cylindrical back cavity according to index change; the sound absorption frequency band of the sound absorption device does not completely depend on the inherent frequency generated by resonance of an air column at the neck of the Helmholtz silencer, the structure is simple, the cost is low, the sound energy dissipation when sound waves enter the Helmholtz silencer can be increased, and the sound absorption device has good broadband sound absorption performance.

In accordance with certain aspects, noise cancellation systems and methods are utilized to mitigate engine tonal noise at sleeping locations in the aircraft cabin space. In one embodiment, an onboard noise cancellation system is provided that includes a plurality of microphones, the plurality of microphones, and a plurality of speakers, and a noise cancellation circuit. In this embodiment the plurality of speakers are arranged proximate to a bed in the sleeping area of the aircraft cabin. Likewise, the plurality of speakers are arranged proximate to the proximate to the bed in the sleeping area. The noise cancellation circuit is further coupled to the plurality of speakers, and the noise cancellation circuit is configured to drive the plurality of speakers to generate noise cancellation audio to at least partially cancel engine noise in a region above the bed.

A cancellation device according to one aspect of the invention is a cancellation device that cancels noise coming to a region in a vicinity of a loudspeaker, the cancellation device including at least two loudspeakers 1 and one reference microphone 3, in which the cancellation device is configured such that an acoustic signal emitted in a sound emission direction of a same loudspeaker and an acoustic signal emitted in an opposite direction collide with each other, the at least two loudspeakers 1 and the reference microphone 3 are arranged on a same plane, the at least two loudspeakers 1 emit cancellation sound that cancels the noise in synchrony, and the plane is a plane including a boundary between a sound emission direction of the two loudspeakers 1 and a direction opposite to a sound emission direction.

Various aspects include active noise reduction (ANR) headsets and methods of controlling such headsets. In some implementations, a headset includes: at least one electro-acoustic transducer; a power source for powering the at least one electro-acoustic transducer; and a control circuit configured to apply active noise reduction (ANR) to environmental sound using the at least one electro-acoustic transducer, sample voltage drops across the power source, and adjust a compressor threshold for the ANR based on the sampled voltage drops across the power source.

The invention discloses an adjustable sound barrier system for noise reduction of a transformer and a noise reduction method. The adjustable sound barrier system comprises a sound barrier and an adjustable silencer, and the adjustable silencer comprises a silencing device and an electric shutter; the blades of the electric louver are opened or closed, so that the electric louver has a good sound insulation effect but is not ventilated, or can be ventilated but does not have the sound insulation effect. Through the integrated design of the sheet type silencer and the electric shutter, on the premise that the noise reduction performance is ensured, the length of the silencer is compressed to 0.6-1.2 m from the traditional length of 1.5 m or above, and the occupied area and cost are remarkably reduced; according to the difference between day and night noise limit values and the real-time oil temperature of the transformer, working modes are automatically switched, and accurate control of'preferential daytime heat dissipation and preferential night noise reduction 'is achieved; an existing oil temperature monitoring system of the transformer is used as a data source, additional sensors are not needed, and the structure and wiring are simplified; and multiple alarm logics are set, shutter faults and oil temperature abnormity are found and prompted in time, and equipment and noise safety is guaranteed.

The disclosed computer-implemented method may include receiving, from a client device, a request for multimedia content, where the request includes both a manifest request that includes client identification data and a license request that includes a license challenge. The method may further include validating the received request for multimedia content using the client identification data in the manifest request and generating a manifest response that includes an identification of a specified multimedia content stream that is to be provided to the client device. The method may also include acquiring at least one license in response to the license request, where the license includes a response to the license challenge having various content keys, and then providing the specified multimedia content stream, including the generated manifest response and the acquired license, to the client device. Various other methods, systems, and computer-readable media are also disclosed.

The present application discloses an active echo canceller for a hearing device, where the hearing device comprises an output interface configured to output a first sound based on a far-end signal, an input interface configured to provide a plurality of input audio signals indicative of the first sound and a near-end sound, and one or more processors, a filter configured to: filter a first filter input signal based on a far-end signal using a first filter to provide a first filtered signal, the first filter configured to estimate an echo signal originating from a first sound; combining the first filtered output signal with a first input signal to provide a first output signal; filtering a second filter input signal based on the plurality of input audio signals using a second filter to provide a second filtered signal, the second filter configured to attenuate the near-end sound; combining the second filtered output signal with the first filtered output signal to provide an update signal; one or more first filter coefficients of the first filter are updated based on the update signal.

Embodiments of the present invention relate to the technical field of vehicle noise reduction, and disclosed are a noise reduction method, an electronic device, and a storage medium. In the embodiments of the present invention, the noise reduction method comprises: determining an optimal compensation parameter from a preset compensation parameter set on the basis of a current engine rotation speed, compensation parameters including parameters used for compensating for at least one of the following pieces of information: a reference signal, a filter coefficient, a loudspeaker signal, and a microphone signal; and generating a cancellation signal on the basis of the determined compensation parameter, the cancellation signal being used for cancelling current engine noise. The present invention is at least conducive to improving the noise reduction effect.

Seating including a sound cancellation system is described. An example vehicle bench seat has a first backrest, a first loudspeaker, a second backrest, a second loudspeaker, a center portion, and a seat base. The first loudspeaker is disposed within the first backrest, and the second loudspeaker is disposed within the second backrest. Each of the first loudspeaker and the second loudspeaker emits primary sound waves and secondary sound waves. The secondary sound waves of the first loudspeaker are 180 degrees out of phase with the primary sound waves of the first loudspeaker, and the secondary sound waves of the second loudspeaker are 180 degrees out of phase with the primary sound waves of the second loudspeaker. The center portion includes a channel that directs the secondary sound waves emitted by the first loudspeaker and the second loudspeaker into a vehicle cabin to cancel unwanted primary sound waves.