A system for reducing far-field noise produced by well operations includes a passive sound barrier shielding an area, in which the well operations are performed, in an open-air environment. The system further includes a sound sensor to receive near-field noise from the well operations. The system further includes an analysis module, coupled to the sound sensor, to generate an anti-noise signal. The system further includes active anti-noise generators, coupled to the analysis module, to generate anti-noise, based on the anti-noise signal, that destructively interferes with noise from the well operations outside of the passive sound barrier at a predetermined distance from the passive sound barrier. The analysis module generates the anti-noise signal based on the near-field noise, the predetermined distance, and adjustable positions and orientations of the active anti-noise generators.

A passive neonatal transport incubator (PNTI), useful for thermo-regulating a neonate, comprising an inner volume configured by means of size and shape to accommodate the neonate, the inner volume is defined by an envelope having a main longitudinal axis with a proximal end and an opposite distal end, the envelope is at least partially perforated. Further, the PNTI is configured to be ventilated by an independently ventilated medical device, and is configured by means of size, shape and material to allow the neonate to be examined by the medical device.

The disclosure relates to combined active noise cancellation and noise compensation in a headphone. An audio processing device includes a selector and a noise compensation unit. The selector can select one of a plurality of first transfer functions based on at least one feature of at least one of an external noise and a content audio signal representing a sound to be reproduced through the headphone. The noise compensation unit can compute a second audio signal by applying the selected first transfer function to a first audio signal, and derive gains for the noise compensation at least based on the second audio signal. The at least one feature can be used to distinguish at least two of the first transfer functions. Each of the first transfer functions can transform the first audio signal to the second audio signal which is assumed as representing a version of the sound represented by the first audio signal, which arrives at an eardrum of a listener wearing the headphone. The first audio signal is one of a noise signal representing the external noise and the content audio signal.

A sound signal processing method and a headset device. A target filter and a first audio processing unit are added. The target filter processes an external sound signal collected by an external microphone, to obtain an environmental sound attenuation signal and a voice attenuation signal. The first audio processing unit removes, based on the environmental sound attenuation signal and the voice attenuation signal, a second external environmental sound signal and a second voice signal from an in-ear sound signal collected by an error microphone, to obtain a blocking signal, and transmits the blocking signal to a feedback filter. The feedback filter may generate an inverted noise signal corresponding to the blocking signal and play the inverted noise signal through a speaker.

An earphone includes an electro-acoustic transducer and an earphone assembly. The electro-acoustic transducer is configured to generate an acoustic signal in response to an electrical signal. The earphone assembly has an inner surface and an earphone acoustic opening. The electro-acoustic transducer is disposed inside the earphone assembly and defines a front cavity between the electro-acoustic transducer and the earphone acoustic opening along a first portion of the inner surface and a back cavity between the electro-acoustic transducer and a second portion of the inner surface. The earphone assembly further includes an acoustic impedance branch having an impedance aperture in acoustic communication with the front cavity. The acoustic impedance branch includes an acoustic resistive element and a branch volume that reduce a resonance at a first resonance frequency for an occluded ear canal defined by the front cavity of the earphone assembly and an ear canal of a user.

Provided is a noise-cancelling headphone device that prevents deterioration of reproduction frequency characteristics in a high-frequency band while preventing reduction in the reproduction output in the low-frequency band. The proposed technology is a noise-cancelling headphone device, including a speaker unit provided with a dome-shaped diaphragm having a center dome and a sub-dome, a microphone that detects ambient noise incident into the speaker unit, a baffle plate supporting the speaker unit and provided with sound emission holes to radiate reproduction sound emitted from the speaker unit, and a signal processing circuit to generate noise cancellation signal generated based on the ambient noise detected by the microphone, wherein an acoustic resistance member is provided at the position facing the sub-dome of the dome diaphragm.

An apparatus is provided. The apparatus includes a plurality of flow guiding structures spatially aligned in a first row, each of the plurality of flow guiding structures comprising a fin-shape to funnel airflow at a trailing edge of each of the plurality of flow guiding structures. The apparatus also includes a plurality of flow separating structures spatially aligned in a second row interleaved between each of the plurality of flow guiding structures, each of the plurality of flow separating structures comprising a fin-shape configured to split airflow received from the plurality of flow guiding structures.

The invention relates to an active noise-cancelling audio headphones having two circum-aural earpieces, comprising a partition designed to face an ear; said partition incorporating at least one vent passing through said partition so as to generate intentional leaks having a length greater than 1.5 mm and a width selected in such a way that there are either a ratio between said length and said width is less than or equal to 8:1 if a median section is greater than 1.7 mm.sup.2; or a ratio between said length and said width is less than or equal to 4:1 if said median section is less than 1.7 mm.sup.2.

A quiet toilet apparatus disclosed. Microphones and circuitry are used to receive and detect one or more virtual point source locations and propagation directions of unwanted toilet noise. Speakers are used to create one or more synthesized wave fronts resulting in cancelation and reduction of unwanted toilet noise. The speakers, microphones and circuitry may be located within a toilet seat of a toilet or at a remote location. A user device or remote device may be connected to the noise reduction toilet apparatus for data recording, collection, reporting, and electronic noise filtering.

Disclosed is an active-noise control device including two passive attenuation earphones each provided with an external microphone, an internal microphone and a loudspeaker. The control device includes a first processing chain having a feedforward filter, a feedback filter and a reconstruction module. The control device includes a second processing chain having a sound source identification module, said second processing chain being implemented in parallel with the first processing chain, and being suitable for parameterizing the first processing chain.