A wearable device may include a processor configured to perform active noise cancelation (ANC) applied to an input audio signal received by at least one microphone, and detect a self-voice signal, based on one or more transducers. The processor may also be configured to apply a first filter to an external audio signal, detected by at least one external microphone on the wearable device, during a listen through operation based on an activation of the audio zoom feature to generate a first listen-through signal that includes the external audio signal. The processor may also be configured to after the activation of the audio zoom feature terminate a second filter that provides low frequency compensation. The processor may be configured to produce an output audio signal that is based on at least the first listen-through signal that includes the external signal, and is based on the detected self-voice signal.

Disclosed in the present disclosure are a wireless playback device, a playback control method thereof, and a head-mounted wireless headset system. The device includes: a housing, a headband detection device, a processor, a power amplifier (PA) operational amplification device, and a speaker. The headband detection device collects connection condition data of a headband device and the housing. The processor is connected to the headband detection device and controls the PA operational amplification device to adjust an operation power mode of the speaker according to the connection condition data. The PA operational amplification device is connected to the processor and the speaker, respectively, and adjusts the operation power mode of the speaker according to control of the processor. Therefore, the function automatically switching the headphone function and a small speaker function is realized, and the user experience is improved.

An earplug extending along an earplug axis may include an outer portion and an inner portion. The outer portion may include a proximal portion extending from a second end region, a distal portion extending from a first end region, and a slant portion therebetween. The outer portion may define an interior space. The inner portion may extend between a first and second end region and may be coupled to the outer portion within the interior space. A distance between an end of the inner portion proximate the second end region of the inner portion and an end of the outer portion proximate the second end region of the outer portion may be greater than a length of the proximal portion of the outer portion measured along the earplug axis.

Disclosed are hearing protection devices and housings for noise sensors for the same. Hearing protection devices can include an ear cup including an external casing partially defining an inner space, a noise sensor including a microphone electrically coupled to a printed circuit board, and a housing disposed in an aperture defined in the external casing. The housing can define an axial bore defining a noise sensor receiving portion and an acoustic communication portion. The inner space of the ear cup can be substantially airtight when the housing is sealably disposed at or proximate the aperture, the microphone is engaged within the noise sensor receiving portion of the housing, and the ear cup is worn securely about the wearer's ear. The noise sensor can be calibrated by removing a removable securing collar and slidably disposing a calibration tool into the axial bore without further disassembling the hearing protection device.

A reference microphone for detecting noise is located under a first duct. The noise is in the form of a first plane wave in the first duct. A speaker is located on a top of the first duct. Connected to an upper part of the first duct is a second duct including an error microphone. The first plane wave in the first duct passes through an acoustic path and reaches the second duct. The error microphone detects the sound, and the speaker outputs a second plane wave with an opposite phase for canceling the first plane wave.

A method for manufacturing a cartilage conduction audio device is disclosed. A manufacturing system receives data describing a three-dimensional shape of an ear (e.g., the outer ear, behind the ear, the concha bowel, etc.) of a user. The system identifies one or more locations for one or more transducers along a back of an auricle of the ear for the user that vibrate the auricle over a frequency range causing the auricle to create an acoustic pressure wave at an entrance of the ear canal. The system then generates a design for a cartilage conduction audio device for the user based on the one or more identified locations of the transducers at which acoustic pressure waves generated by the one or more transducers satisfy a threshold performance metric for the user. The design may then be used to fabricate the cartilage conduction audio device.

The present invention is directed to earmuffs, and is intended to allow for hot packs to be used, thereby improving the effect of protecting ear regions from cold and a cold wave in the winter season. In order to achieve this, the present invention provides earmuffs (10) including a pair of ear covers (11) and a band (12) configured to connect the ear covers (11), wherein reception slots (13) through which hot packs (20) configured to generate heat are inserted and stored are formed in the ear covers (11), respectively.

The invention relates to a shaped body and a process for its production by means of a radiation-induced printing process, characterized in that the shaped body is produced from a liquid or viscous material which contains a starting component with cycloolefinic groups, a thiol with at least two thiol groups per molecule and an initiator and/or catalyst for the light-induced thiol-ene addition reaction between the thiol groups and a double bond of the cycloolefinic groups, and the solidification takes place by directing light from a radiation source onto a region of a surface of a substrate, a layer of the liquid or viscous material located there being subjected to organic polymerisation by the action of radiation and thereby solidified, whereupon further layers of the liquid or viscous material, which are each located on the layer of the most recently solidified material, are successively solidified with the aid of this radiation source.

A hearing protection system, a hearing protection device and related method, the hearing protection device comprising an earpiece device comprising a first connector, a first earpiece, and a second earpiece, the first earpiece comprising a first primary microphone and a first receiver wired to the first connector and the second earpiece comprising a second primary microphone and a second receiver wired to the first connector; and a processing device comprising a processor, an earpiece interface, and a wireless communication interface, wherein the processor is configured to receive a first microphone input signal from the first primary microphone; process the first microphone input signal for provision of a first primary output signal for the first receiver based on the first microphone input signal; receive a communication request from a communication device via the communication interface; and in response to receipt of the communication request, communicate with the communication device via the communication interface.

A hearing protection system, a hearing protection device and related method, the hearing protection device comprising an earpiece device comprising a first connector, a first earpiece, and a second earpiece, the first earpiece comprising a first primary microphone and a first receiver wired to the first connector and the second earpiece comprising a second primary microphone and a second receiver wired to the first connector; and a processing device comprising a processor, an earpiece interface, and a wireless communication interface, wherein the processor is configured to receive a first microphone input signal from the first primary microphone; process the first microphone input signal for provision of a first primary output signal for the first receiver based on the first microphone input signal; receive a communication request from a communication device via the communication interface; and in response to receipt of the communication request, communicate with the communication device via the communication interface.