A dynamic microphone that enables taking a long propagation path of a sound wave on a back side of a diaphragm, and by which unidirectivity can be obtained even at a low frequency. The dynamic microphone includes: a dynamic microphone unit; and an air chamber provided on a back side of a diaphragm of the dynamic microphone unit, wherein the air chamber is folded back to make a propagation path of a sound wave on the back side of the diaphragm long, a plurality of acoustic resistors is arranged in the air chamber at intervals to each other in a direction of the propagation path of a sound wave, and acoustic resistance values of the plurality of acoustic resistors become higher as the propagation path of a sound wave goes away from the diaphragm.

A portable electronic device is described and includes a device housing, an acoustic housing disposed within the device housing and defining an interior volume, a speaker diaphragm assembly disposed within the interior volume and in fluid communication with a first opening leading out of the housing, and a microphone disposed within the interior volume and in fluid communication with a second opening leading out of the acoustic housing. Placing both the speaker diaphragm assembly and microphone within the same acoustic housing allows both components to share common power and data transfer circuitry. Furthermore, the additional volume of the acoustic housing used to accommodate the microphone can improve the acoustic performance of the speaker diaphragm assembly by increasing the back volume associated with the speaker diaphragm assembly.

An electronic device is provided. The electronic device includes a housing including a first surface facing in a first direction, a second surface facing in a second direction opposite to the first direction, and a side surface surrounding at least a part of a space between the first surface and the second surface, an opening formed on at least one of the first surface, the second surface, or the side surface, a first channel extended from the opening, a second channel connected to at least a part of the first channel and extended to an inner space of the housing, an audio mounted inside the housing and connected to the opening through the first channel, a first member inserted into the first channel, and a second member inserted into the second channel, for allowing and restricting introduction and discharge of air into and from the inner space of the housing.

An acoustic device with a housing with a central portion and first and second leg portions that depend from the central portion, a first acoustic driver carried by the first leg portion, a second acoustic driver carried by the second leg portion, and an audio signal control system that directs audio signals to each of the first and second drivers, where the drivers transduce the audio signals to output sounds. The audio signal control system is arranged to apply first and second equalization modes to the audio signals in a first and second listening mode, respectively. The second equalization de-emphasizes frequencies below a first threshold frequency and boosts frequencies above the first threshold frequency.

A passive radiator is provided for use in a loudspeaker system in which the passive radiator and a driver are connected to one another within a speaker enclosure by an acoustic coupler having a coupler opening such that the driver and the passive radiator are located in different planes.

A microphone device is provided, including first and second chambers, first and second acoustic sensors, and a sound transmission device. The first and second chambers include the first and second acoustic ports, respectively. The first and second acoustic sensors are arranged in the first chamber and the second chamber, respectively. The sound transmission device coupled to the first and second chambers includes third and fourth acoustic ports, a first acoustic tube, and a second acoustic tube. The first acoustic tube communicates with the first acoustic port and the third acoustic port. The second acoustic tube communicates with the second acoustic port and the fourth acoustic port. The sensitivity difference between the first acoustic sensor and the second acoustic sensor is determined based on the length difference or the cross-sectional area difference between the first acoustic tube and the second acoustic tube.

An electronic device is provided. The electronic device includes a housing including a first surface facing in a first direction, a second surface facing in a second direction opposite to the first direction, and a side surface surrounding at least a part of a space between the first surface and the second surface, an opening formed on at least one of the first surface, the second surface, or the side surface, a first channel extended from the opening, a second channel connected to at least a part of the first channel and extended to an inner space of the housing, an audio mounted inside the housing and connected to the opening through the first channel, a first member inserted into the first channel, and a second member inserted into the second channel, for allowing and restricting introduction and discharge of air into and from the inner space of the housing.

An acoustic device that has a neck loop that is constructed and arranged to be worn around the neck. The neck loop includes a housing with a first acoustic waveguide having a first sound outlet opening, and a second acoustic waveguide having a second sound outlet opening. There is a first open-backed acoustic driver acoustically coupled to the first waveguide and a second open-backed acoustic driver acoustically coupled to the second waveguide.

In one embodiment, an apparatus comprises i) an audio transducer; ii) an audio driver plate having an ear-facing side and a non-ear-facing side; iii) a rigid housing substantially circumferentially surrounding the audio driver plate without substantially covering the ear-facing side and non-ear-facing side of the audio driver plate; iv) a front plate mounted on the ear-facing side of the audio driver plate and spaced apart from the audio driver plate; and v) a fixing gasket affixed to the non-ear-facing side of the audio driver plate. In addition, the front plate is adapted to be compressed against an ear-facing portion of an audio transducer holding device and the fixing gasket adapted to be compressed against a non-ear-facing portion of the audio transducer holding device, whereby the audio transducer is adapted to be held within the audio transducer holding device by compressive force on both the fixing gasket and the front plate.

An example electronic device may include a plate at least partially inserted into a first opening and including a transparent portion including a protruding portion having a gap spaced apart from an inner circumference of the first opening of the housing and a second opening spaced apart from an periphery of the protruding portion, a sidewall in which a plate including the transparent portion extends from a first printed circuit board in the housing towards the plate including the transparent portion, a second printed circuit board supported by the sidewall, a flash module comprising a flash disposed on one surface of the second printed circuit board facing the plate including the transparent portion, and a microphone disposed in a space formed through the at least one sidewall, and the second printed circuit board includes a through hole facing the microphone so that the microphone obtains an audio signal.