An image capture device includes an audio depression formed into the housing with a drainage microphone mounted therein. A cover protects the drainage microphone disposed beneath the cover from an environment external to the image capture device. The cover and audio depression define a drainage channel extending from a channel entrance, through a channel volume, and out a channel exit. The surface area of the opening of the channel entrance is proportioned relative to the channel volume such that the ratio of the surface area to volume is greater than ten percent. This allows the cover to shift resonance outside of a desired frequency band.

A system including a work string and an acoustic device for sensing or transmitting an acoustic signal at least partially traveling through a borehole fluid within a wellbore and a method of operation. The acoustic device includes a compensation fluid, an acoustic transducer at least partially disposed in the compensation fluid and configured to sense the acoustic signal, and a metallic cover that separates the compensation fluid from the borehole fluid and configured to deform in response to a pressure difference between the borehole fluid and the compensation fluid. The acoustic device is conveyed into the wellbore and an electric signal is sent or received with the processor to or from the acoustic transducer.

A system including a work string and an acoustic device for sensing or transmitting an acoustic signal at least partially traveling through a borehole fluid within a wellbore and a method of operation. The acoustic device includes a compensation fluid, an acoustic transducer at least partially disposed in the compensation fluid and configured to sense the acoustic signal, and a metallic cover that separates the compensation fluid from the borehole fluid and configured to deform in response to a pressure difference between the borehole fluid and the compensation fluid. The acoustic device is conveyed into the wellbore and an electric signal is sent or received with the processor to or from the acoustic transducer.

An earplug includes a housing and a receiver positioned in the housing. The receiver may be configured to receive a wireless audio signal from an audio source external to the earplug and convert the wireless audio signal to an electrical audio signal. The earplug may include a speaker configured to receive electrical audio signal from the receiver and convert the electrical audio signal into audible sound output from a speaker port. The earplug may include a projection including an opening that defines at least a portion of a sound channel from the speaker. The projection may receive the audible sound output from the speaker and output the audible sound out of the earplug. The earplug may include earplug padding configured to form a seal with a user's ear canal. The earplug may include an acoustic vent positioned in the sound channel, including a waterproof membrane extending across the channel.

An earplug includes a housing and a receiver positioned in the housing. The receiver may be configured to receive a wireless audio signal from an audio source external to the earplug and convert the wireless audio signal to an electrical audio signal. The earplug may include a speaker configured to receive electrical audio signal from the receiver and convert the electrical audio signal into audible sound output from a speaker port. The earplug may include a projection including an opening that defines at least a portion of a sound channel from the speaker. The projection may receive the audible sound output from the speaker and output the audible sound out of the earplug. The earplug may include earplug padding configured to form a seal with a user's ear canal. The earplug may include an acoustic vent positioned in the sound channel, including a waterproof membrane extending across the channel.

A camera system includes an internal loudspeaker assembly for emitting sound waves from the interior of the camera body to the exterior of the camera body through external ports using internal electronic components. Some components of the loudspeaker assembly are sensitive to wet conditions and are protected from the environment by a membrane. The membrane and its support structures are configured to allow the sound waves to translate through the membrane and external to the camera body in both wet and dry environments. The loudspeaker assembly includes a support structure that prevents the membrane from deforming to the point of breaking or to the point of contacting the loudspeaker when submerged.

A camera system includes an internal loudspeaker assembly for emitting sound waves from the interior of the camera body to the exterior of the camera body through external ports using internal electronic components. Some components of the loudspeaker assembly are sensitive to wet conditions and are protected from the environment by a membrane. The membrane and its support structures are configured to allow the sound waves to translate through the membrane and external to the camera body in both wet and dry environments. The loudspeaker assembly includes a support structure that prevents the membrane from deforming to the point of breaking or to the point of contacting the loudspeaker when submerged.

An image capture device includes a housing having a pattern of apertures and a membrane assembly. The membrane assembly includes a support that has internal and external surfaces and a channel that aligns with at least one aperture of the pattern of apertures and extends between the internal and external surfaces. The membrane assembly includes indents that are adjacent to the channel, aligned with the pattern of apertures, and disposed on the external surface. The indents have a depth that is less than a depth of the channel.

An underwater wireless charging method and device using acoustic waves for covering the entire depth of sea is disclosed. Within 10 meters below the water-level, unmanned undersea vehicles (UUV) are charged from a mother ship . Between 10 meters and 100 meters below the water-level, a sound wave is directly sent from the mother ship to the underwater sensor to be charged. At the depth of more than 100 meters below the water-level, an underwater UUV is adopted to in situ charge the underwater sensor node at close range. The transmitting transducer converts electrical energy to sound energy through the inverse piezoelectric effect. The sound wave is then sent by the transducer to a hydrophone that transforms sound energy to electrical energy via the piezoelectric effect. The load can thus be charged. Three types of wireless charging can be realized by the station for different underwater application scenarios, so as to satisfy the wireless charging for covering the entire depth of sea.

The present disclosure provides an acoustic output apparatus including one or more status sensors, at least one low-frequency acoustic driver, at least one high-frequency acoustic driver, at least two first sound guiding holes, and at least two second sound guiding holes. The status sensors may detect status information of a user. The low-frequency acoustic driver may generate at least one first sound, a frequency of which is within a first frequency range. The high-frequency acoustic driver may generate at least one second sound, a frequency of which is within a second frequency range including at least one frequency exceeding the first frequency range. The first and second sound guiding holes may output the first and second spatial sound, respectively. The first and second sound may be generated based on the status information, and may simulate a target sound coming from at least one virtual direction with respect to the user.