An acoustic microphone assembly for surveillance into a protected space includes a microphone including a transducer and a diagram adapted for picking up acoustic sound waves, electronic circuitry for processing input, a power source, and an audio output wire or trace for delivering processed digital sound to a sound system, a cover plate having at least two bolt openings for mounting to a base plate on a wall or structure the cover plate covering an opening there through into the protected space, the cover plate accepting an orthogonal mounting of the microphone, and a sound diffraction pattern of different sized openings placed through the cover plate, the sound diffraction pattern located in alignment to the mounted microphone head and having a foot print roughly equal to the circumference of the head of the microphone.

A compression driver for an omnidirectional loudspeaker includes a motor assembly and a dome diaphragm disposed coaxially above and operably connected to the motor assembly, the diaphragm having a convex surface and a concave surface. The compression driver includes a phasing plug having a top portion and a bottom portion having a concave bottom surface disposed adjacent the convex surface of the diaphragm and defining a compression chamber therebetween. The phasing plug includes a plurality of conduits extending through the bottom portion for sound waves to travel and converging to form an annular exit, the top portion including a plurality of radially expanding channels acoustically connected to the annular exit. Actuation of the diaphragm by the motor assembly generates sound waves within the compression chamber which travel through the annular exit and the radially-expanding channels to create a generally horizontal 360° radiation pattern of the sound waves from the compression driver.

A speaker horn with rotatable radiation characteristics has a base body in the form of an opening funnel with a rotationally symmetrical inner wall in the radiation area and an insert mounted so that it can rotate relative to the base body. The insert covers part of the rotationally symmetrical inner wall acoustically and causes the rotatable radiation characteristic of the speaker horn.

A voice-controlled electronic device that includes an axisymmetric device housing having a longitudinal axis bisecting opposing top and bottom surfaces and a side surface extending between the top and bottom surfaces. The device can further include a plurality of microphones disposed within the device housing and distributed radially around the longitudinal axis; a processor configured to execute computer instructions stored in a computer-readable memory for interacting with a user and processing voice commands received by the plurality of microphones and first and second transducers configured to generate sound waves within different frequency ranges.

The invention relates to a loudspeaker box (12) comprising a housing (20), a loudspeaker (22) arranged in the housing (20) for generating sound, and a sound-guide device (14), wherein the sound-guide device (14) is arranged in front of the loudspeaker (22) in a sound propagation direction (25), wherein the sound-guide device (14) is configured in such a way that the sound-guide device (14) guides the sound generated by the loudspeaker (22) to a front slot (30) arranged on a front side (27) of the sound-guide device (14) for the purposes of sound radiation. The invention also relates to a column loudspeaker box (10) comprising at least two loudspeaker boxes (12) arranged above one another.

Sound quality is improved. A plurality of speaker units including a first speaker unit of a dynamic type, an arrangement case having an inner space formed as an arrangement space in which the plurality of speaker units is arranged, and a sound conduit protruding from the arrangement case and provided as a path for sound output from the plurality of speaker units are provided, the first speaker unit has a highest sound output band among the plurality of speaker units, the axial direction of the sound conduit and the axial direction of the first speaker unit are oriented in the same direction, the speaker units except the first speaker unit are arranged around the first speaker unit or on the opposite side to the sound conduit with the first speaker unit therebetween, and a central axis of the first speaker unit is positioned further on the inner side than the inner peripheral surface of the sound conduit.

An acoustic waveguide in accordance with one or more embodiments of the present technology that comprises a housing having a proximal end with an inlet aperture and a distal end with an outlet aperture, and a mounting flange positioned at the proximal end and configured to acoustically couple a driver to inlet aperture. A plurality of sound channels extend through the housing and acoustically couple the inlet aperture to the outlet aperture. Each sound channel at least partially defining a sound path has an acoustic length, wherein at least one of the sound paths of the plurality of sound channels has a bend angle that exceeds 180 degrees.

A compression driver is provided. In one embodiment, the compression driver comprises an annular diaphragm, a phasing plug, and a housing, wherein the housing has a rectangular exit proximate to a blade of the phasing plug.

A loudspeaker comprising: an acoustic diaphragm having front and rear surfaces, the acoustic diaphragm in use being driven so as to vibrate and radiate acoustic waves from its front surface in a forward direction away from the loudspeaker and from its rear surface in a rearward direction, and a drive unit located rearwardly or to the front/outside of the diaphragm, there being at least one open duct leading in a rearward direction away from the diaphragm, in which the at least one open duct has a cross-sectional area which decreases in the rearward direction, and in which acoustic waves radiated from the rear surface of the diaphragm pass through the open duct before contacting a front surface of an acoustic metamaterial absorber located generally behind the drive unit and immediately to the rear of the duct.

A user terminal apparatus is provided. The user terminal apparatus includes: a flexible display including: a main area; and a sub area comprising a curved portion and extending from the main area to a side portion of the user terminal apparatus; a housing configured to enclose the flexible display; a sound output hole provided between the flexible display and the housing and configured to output a sound from a call function; and a sound input hole configured to receive an input sound.