An apparatus for patient's lung function testing using forced oscillation technique is described. The apparatus includes a sub-woofer configured to generate a pressure wave. The apparatus further includes a waveguide configured to direct the generated pressure wave to be introduced into airflow towards the patient's lung. The apparatus includes a pressure transducer configured to measure a change in pressure of the airflow and one or more flow transducers configured to measure a change in flowrate of the airflow, in response to the pressure wave introduced into the airflow. The apparatus includes a computing unit configured to determine a mechanical impedance of the patient's lung based on the measured change in pressure and flowrate of the airflow.

The present disclosure relates to a waterproof open earphone. The waterproof open earphone may include a housing, at least one button, at least one elastic pad, and at least one pair of speaker units. The housing may be placed on a head or at least one ear of a user while not blocking an ear canal of the user. The at least one button may be set on the housing, wherein each of the at least one button corresponds to a button hole. The at least one elastic pad may correspond to the at least one button, respectively, wherein each elastic pad prevents the corresponding button from moving relative to the button hole. Each pair of the at least one pair of speaker units may generate sound within a frequency range from two sound guiding holes through two sound guiding tubes.

A vehicle door includes a wet space provided within the vehicle door, which is separated from a dry space on the vehicle door, wherein the vehicle door includes at least a door skin that borders the wet space and dry space, a speaker, and a resonance body component configured to form a resonance space for the speaker, wherein the resonance body component defines a closed volume for the resonance space in the wet space of the vehicle door.

A portable speaker system includes a tunnel with at least one internal speaker facing inwardly into the tunnel such that acoustic resonance amplifies desirable frequencies of sounds emitted by the internal speaker. The portable speaker system includes solar panels and is waterproof. A display touch screen permits operation of the speaker system. The portable speaker system is adapted to receive input of audio files from a variety of sources. A non-transitory storage medium permits storage of the audio files and a CPU is programmed to permit playback of audio files in a desired sequence or from a desired live-streaming source. The smart speaker can utilize Bluetooth, Wi-Fi, and/or telecommunication connectivity to receive and/or play audio files, and can queue files from multiple sources for playback.

The present disclosure relates to an acoustic output apparatus. The acoustic output apparatus may include an earphone core including at least one acoustic driver for outputting sound though one or more sound guiding holes set on the acoustic output apparatus, a controller configured to cause the at least one acoustic driver to output sound, a power source assembly configured to provide electrical power to the earphone core, the one or more sensors, and the controller, and an interactive control component configured to allow an interaction between a user and the acoustic output apparatus.

A filter that may increase and extend, the bass frequency response of a speaker of an audio device. The filter may be space-efficient. The filter may be part of a device that does not necessarily have a large rear cavity and that does not necessarily have porting and/or passive radiating. The low-frequency extension filter may be used, for example, with a smaller rear cavity while essentially simulating the acoustic effects of a much larger rear cavity. The low-frequency extension filter may include a plurality of acoustic pathways, such as tubes, which may wind around along a tortuous path and which may resemble a labyrinthine design. The tubes may be selected to resonate with particular predetermined low frequency channels. For example, the tubes may be approximately a quarter wavelength of the center of the corresponding frequency channel, or even slightly shorter.

An audio device includes a plurality of reflective components that reflect sound emitted from a loudspeaker unit. The audio device forms a reflective space surrounded by the plurality of reflective components. The audio device includes an acoustic channel that is tube-shaped and includes an opening on one end and a terminating portion on an other end, the one end being connected to a communication hole provided in a reflective component among the plurality of reflective components, and a sound absorbing material disposed at a central portion of a sound path formed by the acoustic channel.

One or more embodiments of the present disclosure relate to a two-way loudspeaker design that forces a condensed geometry between low frequency (LF) and high frequency (HF) drivers and then “floats” a midrange waveguide in front of the LF driver. This is a hybrid design meant to benefit from the close proximity of acoustic centers without introducing a central axis obstruction for the LF driver. In addition, the LF and HF waveguides and associated acoustic elements are used to redirect very low frequency energy not supported adequately by the LF waveguide to exit freely using other paths.

A broadband ultrathin acoustic wave diffusion structure has a plurality of acoustic wave diffusion units. Each acoustic wave diffusion unit has at least one acoustic wave propagation section, and an acoustic wave focused section communicating with the acoustic wave propagation section is arranged according to needs. The acoustic wave focused section is formed by an acoustic wave focused cavity filled with acoustic material. The acoustic wave focused cavity is a variable-section cavity. The acoustic wave propagation section is formed by a simply connected acoustic wave propagation passage with a close end. Different acoustic wave diffusion units have different lengths of the simply connected acoustic wave propagation passages. The maximum length of the simply connected acoustic wave propagation passage may be dozens or even hundreds of times of the thickness of the acoustic wave diffusion structure, which can meet the diffusion requirements for low frequency acoustic waves to the maximum extent.

Disclosed herein is an electronic device. In an embodiment, the electronic device may include a body, a display combined with the front of the body, and a speaker assembly embedded on at least one side of the body, wherein the speaker assembly may include a casing configured to form an external appearance and a speaker unit combined with the casing and configured to have at least part of an element of the speaker assembly exposed to an outside of the casing.