摘要:
Provided is an acoustic reproduction apparatus, including a first microphone to be used for noise cancellation processing using a feedback scheme, a second microphone including a sound collection surface in a direction different from a direction of a sound collection surface of the first microphone and to be used for noise cancellation processing using the feedback scheme, and an acoustic signal processing unit configured to generate a noise-cancelling signal using a first sound collection signal collected by the first microphone and a second sound collection signal collected by the second microphone.
摘要:
A MEMS microphone assembly has an enclosure enclosing a volume of air. A MEMS microphone chip is provided within the enclosure. First and second acoustic ports are formed in the enclosure, defining first and second fluid paths between the volume of air and air outside the enclosure. The MEMS microphone responds to a pre-determined linear interpolative value between two independent pressure signals supplied via first and second ports according to the potentiometic ratio of the acoustic impedances of the first and second ports.
摘要:
A mobile body includes a driving mechanism, a speaker, and a control unit. The driving mechanism supplies power moving the mobile body. The control unit generates from the speaker a sound wave canceling a driving sound generated from the driving mechanism.
摘要:
A kit for attenuation of noise includes a noise source audio transducer, two ear pieces, and a control unit. The two ear pieces have respective resilient bodies that engage outer portions of ear canals of respective ears of a user while respective in-ear transducers of the two ear pieces are respectively positioned in inner portions of the ear canals. The respective in-ear transducers detect discrepancies (e.g., incomplete superpositioning) between the noise and the anti-noise. The respective in-ear transducers optionally detect respective secondary path effects in the ear canals. The noise source audio transducer detects noise generated by a noise source (e.g., snoring noise). The control unit configures an adaptive filter based at least in part on an error signal, and optionally based in part on secondary path effects. The control unit generates signals representative of anti-noise. The two ear pieces produce the anti-noise responsive to the signals. The two ear pieces produce masking noise with sound level that varies in direct correlation with sound level of the noise generated by the noise source.
摘要:
A quiet headspace for the passenger in a vehicle (car/train/bus/aircraft etc.) which comprises a canopy to provide some passive attenuation of the noise coming from the surroundings and within the canopy a noise reduction system comprising, in combination one or more loudspeakers and one or more microphones located close to the passenger's head, and one or more microphones located around the periphery of the canopy.
摘要:
A mobile communication device having an acoustic divider for minimizing acoustic coupling is disclosed. The mobile communication device includes a housing having an outer surface and internal sidewalls. The outer surface and internal sidewalls define a void disposed at and below the outer surface of the housing. The mobile communication device includes a receiver disposed within the housing and below a first portion of the void, and a microphone disposed within the housing and below a second portion of the void. An acoustic divider is disposed within the void and laterally disposed between the receiver and the microphone. The acoustic divider acoustically isolates the first and second portions of the void, thereby minimizing acoustic coupling between the receiver and the microphone.
摘要:
A noise reduction device includes a plurality of noise microphones, noise controller, and control speakers. Noise controller generates a control-sound signal to reduce a noise, at a control center of a control space, with the noise being detected by the plurality of noise microphones. Noise microphone disposed at a shorter distance from the control center than distance “d” indicated by Relational Expression (1) is smaller in number than noise microphones disposed at longer distances than distance “d” where “λ” is a wavelength corresponding to control upper-limit frequency “f” in noise microphones, “d0” is a distance from the control center to control speakers, “t” is a control delay time in control speakers, and “v” is a sound speed. d=d0+t×v−λ/2 (1)
摘要翻译:降噪装置包括多个噪声麦克风,噪声控制器和控制扬声器。 噪声控制器产生控制声音信号,以在控制空间的控制中心处降低由多个噪声麦克风检测的噪声的噪声。 设置在与控制中心相距较短距离处的噪声麦克风距离关系式(1)所示的距离“d”的数量小于距离“d”设置的噪声麦克风的数量,其中“λ”是对应于控制上限 在噪声麦克风中限制频率“f”,“d0”是控制中心到控制扬声器的距离,“t”是控制扬声器中的控制延迟时间,“v”是声速。 d = d0 + t×v-λ/ 2(1)
摘要:
A method of active noise cancellation and an associated system for cancelling noise within an enclosed space are described. The method involves detecting acoustic noise outside of the enclosed space. The method then involves generating a noise cancellation signal outside of the enclosed space, such that the acoustic noise is cancelled prior to the acoustic noise entering the enclosed space.
摘要:
Arrangement for a vehicle including a sensor system arranged on the vehicle for sensing an event requiring an emergency response, a location determining device for determining the location of the vehicle, a communication device arranged on the vehicle for automatically communicating to a remote location when an event has occurred that the event has occurred and providing the remote location with the determined location of the vehicle, and a power source for providing power for the sensor system, the location determining device and the communication device. The communication device communicates to the remote location upon occurrence of the event. The location determining device may be arranged partially or entirely on the vehicle or elsewhere. The remote location may be an emergency response center which can direct aid to the vehicle's location.
摘要:
An open air, wide area noise cancellation system and method provides improved identification and characterization of noise sources then generating noise cancelling sound waves.