Abstract: The present invention discloses directional loudspeaker at least comprising: a loudspeaker cabinet comprising: a folded horn with a length of minimum one quarter of a wavelength, ?, and the horn mouth opening is asymmetrically placed in a front baffle providing a physical delay between the different wraparound pathways to the rear side of the loudspeaker cabinet; one or more driver speakers loading the horn with an open rear chamber, the open rear chamber having at least two opening pathways with a distance there between providing a physical delay of a rear wave, the loudspeaker cabinet provides at least four pathways for in phase and out of phase signals, at least two pathways for the out of phase signal and at least two pathways for the in phase signal amplified by the horn.

Abstract: Innovative apparatus and methods that improve the articulate amplification and reproduction of performed and recorded audio material including loudspeaker crossover and loudspeaker enclosure tuning methods, dual chamber reflex loudspeaker enclosure configurations, loudspeaker enclosures stiffened by trusses, loudspeaker chambers each filled with a monolithic block of acoustical damping material, loudspeaker grille acoustic filters, preamplifier and amplifier features, and signal transmission cables and connectors configured and sized for optimum acoustic articulation and reliability. Also included is a method for advantageously positioning handles, straps, and support stand receptacles.

Abstract: An omnidirectional sound source is formed by mounting a loudspeaker in an enclosed baffle, preferably formed as a low profile hemi-spherical, convex cap with a small circular orifice at its apex and a planar base. The loudspeaker is mounted within the baffle, affixed to the underside of the baffle cap directly beneath the orifice. Substantially plane audio-frequency wavefronts emanating from the immediate vicinity of the loudspeaker diaphragm pass through the orifice and, by the process of diffraction emerge as spherical waves. The spherical wavefronts follow the smooth, axisymmetric, gently curved contour of the low-profile, hemispherical baffle and are not distorted by edge effects where the baffle joins its planar base. As a result, an omnidirectional sound source is obtained.

Abstract: 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.

Abstract: An Acoustic meta material (AMM) device for passive amplification of sound is described. The AMM amplifier device employs a deep sub-wavelength resonator design with high refraction index, which uses resonant amplification of the bass sound. An array of sub wavelength, single frequency channels are used, each resonating and amplifying at a different frequency in the bass frequency range. This is accomplished by having many different channels, each with an opening extending in a same, common, or substantially common direction. Thus, sound emanating from a speaker in a first direction continues in this direction until reaching and entering the openings of the plurality of channels. The sound from the speaker is in all transmitted frequencies of, for example, a musical recording or the like. However, only a specific frequency and/or harmonics thereof are substantially propagated through each channel.

Abstract: 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.

Abstract: Disclosed herein is a slit-firing speaker apparatus capable of full frequency band reproduction. The speaker apparatus includes a speaker unit configured to generate sound, an enclosure, in which the speaker unit is installed, configured to block rearward sound to prevent the rearward sound of the speaker unit from being mixed with forward sound of the speaker unit, and a reflection plate configured to cover the speaker unit and coupled to the enclosure to form an acoustic path through which the generated sound travels. The acoustic path includes a radiation part formed at one end of the acoustic path and radiating the generated sound, and an opening part formed at the other end of the acoustic path.

Abstract: A loudspeaker includes a sound channel extending between the vibrating region of a membrane and the outer side of the loudspeaker, the central axis of the sound channel extending perpendicular to the membrane. The sound channel includes a wave front shaping portion arranged to transform the substantially flat wave front of the sound emitted from the membrane into a wave front having a cross section in the shape of a circular segment. The wave front shaping portion is divided into multiple sub-channels by divider walls that extend from an entrance opening to an exit opening of the wave front shaping portion. Seen in cross section the side walls of each sub-channel converge towards each other from the entrance opening to the exit opening. The centre line of each of the divider walls, seen in cross section, converge towards each other adjacent the exit opening.

Abstract: An electronic device including multiple speakers is provided. The electronic device includes a housing including at least one sound outlet, a first speaker disposed inside the housing, at least one sound transmission path configured to guide first sound produced by the first speaker toward the at least one sound outlet, and at least one second speaker located on the at least one sound transmission path configured to produce second sound. The at least one sound transmission path emits the first and second sounds, mixed on the at least one sound transmission path, to an outside area through the at least one sound outlet. Other various embodiments are possible.

Abstract: The disclosure relates to a sound propagating device including a sound-reflecting component, a first baffle plate, a second baffle plate, and a baffle assembly. The sound-reflecting component has a conical surface. The first baffle plate and the second baffle plate are respectively connected to two opposite ends of the baffle assembly. The first baffle plate, the second baffle plate, and the baffle assembly are moveably located on the conical surface. An angle between the first baffle plate and the second baffle plate is changed when at least one of the first baffle plate and the second baffle plate is moved. In addition, the disclosure also relates to a loudspeaker having the sound propagating device.

Abstract: A speaker system includes a speaker unit that outputs sound, a cabinet having a wall to which the speaker unit is attached, and an acoustic transmission tube that is disposed inside the cabinet and has an open end and a closed end, the acoustic transmission tube having an aperture in a side wall.

Abstract: A speaker system is provided having a line array of drivers wired in parallel and treated with passive or active component systems that serve to electrically taper its effective radiating length with frequency so that it is long/tall at low frequencies and short at higher frequencies, with the effective length of the array determined so as to maintain a listener in the nearfield at typical home and studio listening distances while minimizing the destructive effects of path-length dependent high frequency comb filtering. In alternate embodiments, an array of drivers is provided and wired in series or series-parallel with passive components between the output of one driver and the input of the next. Schemes of active drive and combination schemes of active and passive drive are also contemplated.

Abstract: A meta acoustic horn (MAHI) device for passive amplification of sound is described. The MAH audio amplifier device employs a deep sub-wavelength acoustic meta material horn design with high refraction index, which provides amplification of the sound over large audio frequency range. An array of sub-wavelength, zig-zag channels, contained in a horn-like micro channel is devised, to achieve amplification of sound. This is accomplished by varying the width and port opening of the channel in a fixed ratio, called MAH ratio, opening extending in a same, common, or substantially common direction. The sound emanating from a speaker enters the opening of the MAH channel and comes out amplified at the output port. The sound from the speaker is in all transmitted frequencies of, for example, a musical recording or the like. All frequencies of the original sound thereof are substantially propagated through the MAH channel, and are amplified.

Abstract: 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.

Abstract: A method of forming an enclosure for an audio speaker including forming a rigid inner shell for the enclosure, the inner shell being in a single piece and configured to accept the speaker; and forming an outer shell for the enclosure, the outer shell having an inner surface bounded by the rigid inner shell, the outer shell being in a single piece monocoque construction which includes all the load bearing structures of the enclosure.

Abstract: An acoustic manifold for altering a sound wavefront shape from a loudspeaker having a substantially planar driver, comprising a mounting surface configured to attach to a front surface of a case surrounding the driver and having two vertical openings matching corresponding vertical openings in the case to allow sound from the driver to project therethrough, and a waveguide portion coupled to the mounting surface and having a structure channeling sound projected from the driver through the two vertical openings to be combined in one output area. The structure has a plurality of reflective surfaces configured to create output sound that has a consistent dispersion pattern over a defined area. The manifold is configured to increase a vertical and/or horizontal beamwidth of the projected sound so that listeners positioned off an axis of the loudspeaker will hear a wide range of audible frequencies at a substantially similar sound level.

Abstract: A speaker system broadly comprises a plurality of speaker assemblies each including a speaker housing, an input circuit, a low range speaker, and a higher-range speaker. The input circuit receives audio signals from a sound system or other controller and actively or passively sends the audio signals to the speakers. The low-range speaker is positioned in the upper section and the higher-range speaker is positioned in the lower section. Each speaker assembly is configured to be spaced from the other speaker assemblies within a listening area with each speaker assembly generating low frequency soundwaves and higher-frequency soundwaves. This reduces or eliminates out-of-phase crossover frequency wave cancellation effects within the listening area. The speaker housings are compact while allowing the low-range speaker and higher-range speaker to effectively produce and project desired soundwaves from the suspended speaker housing into the listening area.

Abstract: Embodiments are disclosed that relate to phasing plugs for electroacoustic transducers. In some embodiments, a phasing plug comprises an inlet side, and outlet side, and a plurality of portions having an anfractuous perimeter and forming apertures therebetween, the plurality of portions and apertures arranged along a central axis and extending from the inlet side to the outlet side.

Abstract: A waveguide housing for a speaker assembly. The speaker assembly includes first and second drivers coupled to the waveguide housing where the first driver generates a midrange sound signal and the second driver emits a high-frequency sound signal. The waveguide housing includes a first plurality of sound channels configured to receive the midrange sound signal from the first driver such that the midrange sound signal travels through the first plurality of sound channels and is emitted from the waveguide housing by a first plurality of openings in the waveguide housing. The waveguide housing also includes a second plurality of sound channels configured to receive the high-frequency sound signal from the second driver such that the high-frequency sound signal travels through the second plurality of sound channels and is emitted from the waveguide housing by a second plurality of openings in the waveguide housing.

Abstract: Provided is a throat and a speaker system that can properly correct a path length of a sound wave. A throat according to an embodiment includes a first side wall, a second side wall, a third side wall, and a fourth side wall. A third opposing surface of the third side wall and a fourth opposing surface of the fourth side wall are each formed into a curved surface having a convex portion and a concave portion. The convex portion and the concave portion are so disposed as to oppose each other, and the convex portion and the concave portion are so disposed as to oppose each other. Amplitudes of the curved third opposing surface and the curved fourth opposing surface gradually decrease along a direction from a reference center line to a first opposing surface or a second opposing surface.

Abstract: Provided is a loudspeaker device that can improve sound quality. The loudspeaker device includes: a loudspeaker housing; a first loudspeaker unit provided in a first wall of the loudspeaker housing; and an acoustic tube communicating an inside and an outside of the loudspeaker housing to each other. The acoustic tube has a predetermined length, and is accommodated in the loudspeaker housing and is helically shaped.

Abstract: A speaker system broadly comprises a plurality of speaker assemblies each including a speaker housing, an input circuit, a low range speaker, and a higher-range speaker. The input circuit receives audio signals from a sound system or other controller and actively or passively sends the audio signals to the speakers. The low-range speaker is positioned in the upper section and the higher-range speaker is positioned in the lower section. Each speaker assembly is configured to be suspended from an elevated structure and spaced from the other speaker assemblies within a listening area with each speaker assembly generating low frequency soundwaves and higher-frequency soundwaves. This reduces or eliminates out-of-phase crossover frequency wave cancellation effects within the listening area. The speaker housings are compact while allowing the low-range speaker and higher-range speaker to effectively produce and project desired soundwaves from the suspended speaker housing into the listening area.

Abstract: An acoustic enclosure (1), comprising: a non-heat-conducting external wall (20) at least partially defining a casing (25), at least one electrodynamic loudspeaker (5) including a motor (48), the loudspeaker having a peripheral portion (50) fastened on the external wall, and at least one electronic control circuit (10) of the loudspeaker. The motor and the electronic circuit are connected to a same member (15) of the acoustic enclosure. The member conducts heat and includes an exchange surface (66) able to be traversed by a heat flow (68) circulating in the member originating from the motor and the electronic circuit when the acoustic enclosure is operating, the heat flow being intended to dissipate in the air (76) outside the acoustic enclosure or to pass into a heat-conducting element outside the acoustic enclosure.

Abstract: A speaker apparatus includes first acoustic drivers that respectively output first acoustic signals, and an acoustic coupler having acoustic passages. The acoustic passages respectively include inlets, and an outlet of the acoustic passages is common. The first acoustic signals output from the first acoustic drivers are respectively inlet into the inlets, the first acoustic signals inlet into the inlets are guided to the common outlet, the first acoustic signals are combined at the common outlet to generate a second acoustic signal, and the second acoustic signal is output. Lengths of the acoustic passages from the inlets to the common outlet are identical to each other.

Abstract: The present invention discloses a tweeter and a method for realizing omnidirectional high pitch sound field. The tweeter has advantages of small volume and low cost and comprises a first tweeter unit corresponding to a left sound track, a second tweeter unit corresponding to a right sound track, a radiation structure formed by a plurality of horns. In this technical solution, the tweeter has stereo effect and realizes 360° sound field of the high pitch portion with a smaller volume by disposing that the number of the horns of the left sound track is the same as the number of the horns of the right sound track in the radiation structure, the horns of the left sound track and the horns of the right sound track are disposed at intervals, and the plurality of horns are disposed evenly on a whole plane.

Abstract: An acoustic sound processor is disclosed, which can be used to modify, enhance, pinpoint, and/or amplify the sound of acoustic instruments, the sound received by a microphone/transducer, or the soundwaves passing through any resonance chamber. The acoustic sound processor includes a plurality of tubes, filters, diaphragms, and collectors with ends that open externally and internally of the sound processor, and other ends that either open to an internal sound collector chamber or bypass the chamber on the opposite side of the device.

Abstract: A modular horn type loudspeaker and a modular horn array formed of modular loudspeakers. An acoustic horn includes a first acoustic module. The first acoustic module includes a first acoustic driver and a first acoustic duct, for conducting acoustic energy from the first acoustic driver. The first acoustic duct has a first opening through which acoustic energy is radiated. The first acoustic duct is characterized by a first centerline. A second acoustic module includes a second acoustic driver and a second acoustic duct, for conducting acoustic energy from the acoustic driver. The second acoustic duct has a second opening through which acoustic energy is radiated. The second acoustic duct is characterized by a second centerline.

Abstract: An omni-directional ported speaker including a cabinet which has a space, a first opening, and a second opening, and a first cover member connected to the cabinet, where the space of the cabinet is for disposing a driver that includes a diaphragm portion disposed within and closing the second opening of the cabinet, where the first cover member has a first duct and a plurality of second ducts, and the first duct and each of the second ducts has two openings, one of the two openings of the first duct is coupled to one of the openings of the second ducts, and the other opening of the first duct is disposed proximate to the driving portion of the driver and the first duct is arranged along the direction from the first opening toward the second opening of the cabinet, and the other openings of the second ducts are arranged in the cover member, where the first duct and the second ducts delimit a first angle, and each of the second ducts delimit a second angle between adjacent second ducts.

Abstract: A speaker system for reproducing audio signals of multiple frequency ranges is provided. The speaker system includes a Venturi tube-shaped woofer chamber, a woofer driver, a tweeter unit, and a tweeter driver. The woofer driver and the tweeter driver reproduce low frequency audio signals and high frequency audio signals respectively. The Venturi tube-shaped woofer chamber produces a Venturi effect, offers low airflow resistance, and reproduces low frequency signals with high fidelity. An embodiment of the speaker system includes a subwoofer driver and a mid-woofer driver for reproducing extra low frequency audio signals, and medium frequency audio signals and low frequency audio signals respectively, in addition to the tweeter driver. The speaker system does not require a baffle installation. The woofer driver and the tweeter driver, and in an embodiment, the mid-woofer driver create a point sound source effect for offering a sense of immediacy to music enthusiasts and movie viewers.

Abstract: According to various embodiments, a loudspeaker horn and cabinet are designed to achieve a sound coverage pattern characterized by narrow vertical dispersion and a wide horizontal dispersion. A loudspeaker horn may comprise at least two horn sections, each extending from an inlet to a mouth. A first plurality of outlet channels is disposed in an interleaved column with a second plurality of outlet channels. A loudspeaker cabinet may comprise a primary enclosure having a front wall, the front wall having an aperture in which a low frequency loudspeaker driver is mounted. The loudspeaker cabinet further comprises a top baffle section having a top end and a bottom baffle section having a bottom end, each extending vertically from the primary enclosure. The top baffle section has a first width that gradually increases towards the top end and the bottom section has a second width that gradually increases towards the bottom end.

Abstract: A phase plug for a loudspeaker having a driven diaphragm, wherein at least a portion of the surface of the phase plug disposed in use adjacent the diaphragm is generally annular in two orthogonal directions and has an axis in a third orthogonal direction, and wherein at least a portion of the said annular surface is shaped such that as successive radial cross-sections through the annular surface are generated by rotating a plane about the axis, the cross-sectional shape of the surface of the phase plug varies periodically as the angle of rotation increases.

Abstract: A loudspeaker unit includes a voice coil, a diaphragm, a damper, a frame supporting an outer edge of the diaphragm and an outer edge of the damper, and a duct projecting from an outer surface of the frame, with air moved by vibration of the diaphragm flowing into and out of the loudspeaker unit through the duct. The frame has an aperture that communicates with a space inside the frame. The duct, serving as a separate member, is attached to the frame so as to cover the aperture. The frame further includes a support tab that projects into the aperture. Link terminals are attached to the support tab. Before the duct is attached to the frame, lead wires extending from the voice coil are formed into a predetermined shape and are then connected to the link terminals in a space within the aperture.

Abstract: An acoustic device (90) for use with a movable loudspeaker element (12), the acoustic device defining an enclosure (16) with an aperture to locate the movable loudspeaker element (12), and with a port (20, 28) communicating with the outside of the enclosure, wherein the acoustic device includes at least one sound-suppressing duct (22) incorporating at least one vortex chamber (24) to absorb sound waves propagating through the duct and so suppress sound waves from the port. The acoustic device (90) may be a driver or a frame for a driver; alternatively it may be a loudspeaker or a housing for a loudspeaker.

Abstract: A blended acoustic folded horn and reflector provides for throughput of higher frequency bands without giving rise to standing waves. The horn includes a parabolic region intersected by a first direct radiant axis centered on the throat. The parabolic region is shaped and oriented to define a reflected radiant axis through the mouth for frequency components of the acoustic input above a cut-off frequency. The parabolic region operates to focus sound in the upper portion of the operational frequency range of the loudspeaker and to reflect the resulting focused sound beam along a second radiant axis through the mouth of the folded horn.

Abstract: An automatically controlled directional speaker includes a sound amplifying device, an image capture device, a computing device, an azimuth control motor and an amplitude control unit. The image capture device is provided for detecting the status of surrounding environment to generate image information, and the computing device is communicatively coupled to the image capture device for determining whether there is at least one face information in the image information, and the azimuth control motor is coupled to the sound amplifying device for controlling the azimuth of an output sound of the sound amplifying device according to the face information, and the amplitude control unit is communicatively coupled to the sound amplifying device for controlling the volume of the output sound of the sound amplifying device according to the face information. The speaker may be combined with a lamp to form an LED lamp with broadcasting and illumination functions.

Abstract: A display device housing includes a body, the body is provided with a tuning cavity, the tuning cavity is configured for accommodating a loudspeaker of a display device, the tuning cavity is provided with an inverter tube therein, an opening of the inverter tube corresponds to a space at a rear side of the loudspeaker, and another opening of the inverter tube is provided toward a sound-emitting area of an outer wall of the body and communicates with outside of the housing. This display device housing resolves the problems that a display product is easily subjected to bloop, the sound being not loud enough and poor sound effect. Also a display device is provided.

Abstract: An acoustic horn arrangement including an acoustic horn, a first sound driver operable to drive the acoustic horn and a second sound driver further operable to drive the acoustic horn. The acoustic horn arrangement also including an interface region where sound from the second sound driver transfers into the acoustic horn to combine with sound from the first sound driver, wherein the interface region is adapted to reduce changes in a beam angle measure of the acoustic horn as a function of frequency.

Abstract: A speaker mounting structure includes a speaker including a sound output surface, a front casing containing a display panel, a rear casing which is installed on a rear of the front casing and houses the speaker such that the sound output surface faces a direction opposite to the direction that the front casing faces, and a sound-reflecting member which is mounted on the rear casing so as face the sound output surface of the speaker and which reflects the sound that is output from the sound output surface toward the front of the front casing.

Abstract: A speaker system comprises a speaker transducer, a diffraction-slot acoustic waveguide and first and second mechanical acoustic barriers. The waveguide is arranged in proximity to the speaker transducer along a centerline of the speaker transducer so that the waveguide extends substantially an equal distance on both sides of the centerline of the speaker transducer. The area of the waveguide covers a corresponding area of the speaker transducer. The first and second mechanical acoustic barriers are respectively disposed on each side of the waveguide and cover the areas of the speaker transducer on both sides of the centerline of the speaker transducer that are not covered by the waveguide. The first and second mechanical acoustic barriers provide a low-pass filter for acoustic energy output from the speaker transducer.

Abstract: An implantable system (11) for control of and communication with an implant (17) in a body, comprising a command input device (12) and a processing device (13) coupled thereto, the processing device (13) being adapted to generate input to a command generator (16) which is comprised in the system (11) coupled to the processing device (13) and which is adapted to generate and communicate commands to the medical implant (17) in response to input received from the processing device (13), the system (11) further comprising a memory unit (15) connected to at least one of said devices in the system (11) for storing a memory bank of commands. The command input device (12) is adapted to receive commands from a user as voice commands, and the processing device (13) comprises a filter adapted to filter voice commands against high frequency losses and frequency distortion caused by the mammal body (10).

Abstract: A loudspeaker system includes a speaker enclosure having an opening in a front wall, and a speaker manifold mounted within the speaker enclosure and communicating with the opening. The speaker manifold includes a pair of substantially parallel side walls, a back wall, and top and bottom walls, defining a manifold chamber. The wall opposite the back wall is substantially open to define a manifold opening and to permit the communicating. The manifold opening is substantially in alignment with the front wall opening. A woofer is mounted on a first wall of the speaker manifold. An acoustic vent is mounted on a second wall of the manifold, such that the woofer and the acoustic vent face each other at one of about a 180 degree angle or about a 90 degree angle.

Abstract: A loudspeaker and a method of operation which allow for the production and emphasis of extremely low bass tones. The loudspeaker generally is formed from a loudspeaker driver cone of conventional type which is placed in a very small enclosure with two waveguides attached thereto. A smaller balance waveguide is positioned forward of the face of the cone and a larger tuning waveguide is positioned to the side of the cone. The cross-sectional area of the aperture connections of both waveguides to the enclosure are small compared to the cross-sectional area of the loudspeaker driver cone.

Abstract: A horn loudspeaker, in particular for reproducing bass sound in public address systems, in which the horn (23) is mounted directly to the driver element (21) without any intervening compression chamber. The back side of the driver element (21) is covered by a back chamber (24) designed with walls of a semi-permeable material. The walls may be perforated or made of a “leaky” material such as cell foam with open structure, or a fibrous material. The “leaky” back chamber will prevent the build up of high pressures in the back chamber at large cone excursions. The horn loudspeaker is suitable for stacking in groups of two or more, so as to produce a sound source scalable for reproducing any frequency range heard by humans in public address systems or hi-fi systems. Due to the back chamber design, the horn loudspeaker, for high frequencies especially in conical horn shaped versions, can be stacked close together.

Abstract: A loudspeaker assembly is provided that is suitable for use with a small mobile device, the assembly utilizing a bass-reflex design to increase low frequency efficiency and decrease speaker distortion. The loudspeaker assembly utilizes a single sound port in which the sound pressure emitted by the diaphragm is combined with the sound pressure passing through the bass-reflex channel.

Abstract: An audio apparatus includes a housing including a space which is enclosed at least one pair of opposite surfaces, and an open pipe including a first open end and a second open end positioned in the space. The open pipe has a pipe length of integral multiple of a substantially half wavelength of a stationary wave which is generated in the space. The first open end of the open pipe is disposed at a position of a substantial loop of the stationary wave which is generated in the space.

Abstract: An acoustical receiver for detecting an acoustical signal characterized by a wavelength and a pen transcription system utilizing the same are disclosed. The receiver includes a detector that generates an electrical signal in response to acoustical signals in a predetermined frequency range including that wavelength, a housing surrounding the detector, and a receiving horn. The housing has a housing aperture having a maximum dimension less than the acoustical signal wavelength. The receiving horn has a first opening that is adjacent to the housing aperture and a second aperture having a dimension that is greater than the acoustical signal wavelength.

Abstract: A low frequency exponential folded horn enclosure employing a bifurcated horn terminal pathway and a single driver with a bifurcated throat channel, with driver access from the top or bottom of the enclosure. The horizontal “butterfly” throat is located at the rear of the enclosure and expands vertically, and the vertically arranged bifurcated horn terminus exhausts in a mostly forward direction on opposite sides of the back chamber which is reflex-ported; said ports arranged to each exhaust into the channel folds at each respective corner of the terminal horn channel.

Abstract: A high frequency horn for use in a multiple frequency loudspeaker system having a midrange transducer and a high frequency transducer is disclosed. The high frequency horn includes a horn chamber, horn mouth, a horn throat, a tuned resonant cavity, and a port connected to both the tuned resonant cavity and the horn chamber. The horn throat and horn chamber are located on opposite sides of the horn chamber, the port is located proximate to the horn throat, and the horn throat is configured to be connected to the high frequency transducer. The tuned resonant cavity is tuned to reduce high frequency standing waves produced by the midrange transducer within the horn chamber.

Abstract: A sound effect amplification diffuser includes a deck including a cover member defining a top bearing space, a sound collection hole at one lateral side of the bearing space, a sound collecting hood at the bottom side thereof around the sound collection hole and a sound grille at one side wall thereof opposite to the sound collection hole, a base member affixed to the bottom side of the cover member and an accommodation chamber defined between the base member and the cover member, and an amplification diffuser suspending in the accommodation chamber and connected between the sound collecting hood and the sound grille and adapted to enhance the intensity of the output sound of a mobile electronic device being positioned in the bearing space.

Abstract: A line array speaker provides highly uniform frequency response throughout a wide listening field, while also reducing distortion and improving fidelity, clarity, and output level. In a symmetrical embodiment, central apertures are straddled by a sequential pairs of sets of apertures. The straddling pairs emit frequencies in the next lower frequency band relative to the frequency band of the immediately preceding frequency band apertures. In an asymmetrical embodiment, sequential frequency bands are emitted by adjacent sets of apertures rather than straddling pairs of sets of apertures. Each of the apertures may be a loudspeaker cone, one or more straight slots, one or more arbitrarily curved slots, one or more arbitrarily angled slots, one or more holes or the mouth of a horn. The speaker may have a front baffle which is a flat panel or multiple facets arranged in one or multiple recesses across a front of the speaker.