Abstract: Embodiments are described for a high-frequency waveguide that improves the performance of large-scale surround sound and immersive audio environments. A horn waveguide is configured to be asymmetric about one of a vertical axis and horizontal axis of the waveguide to form an asymmetric horn waveguide. A spherical enclosure surrounds the asymmetric horn waveguide to form a horn speaker, and a three-axis mounting system is configured to fix the horn speaker to one of a wall or ceiling surface of the venue, wherein the mounting system facilitates rotating the horn speaker to a location that provides maximum coverage of the venue within the passband of the asymmetric horn waveguide.

Abstract: Various implementations include loudspeakers. In some particular cases, a loudspeaker includes: a diaphragm; a basket; an electro-magnetic motor supported by the basket and coupled to the diaphragm for driving motion of the diaphragm relative to the basket along a motion axis; a surround coupling an outer peripheral edge of the diaphragm to the basket; and a waveguide coupled to the basket and surrounding the diaphragm. The waveguide has an arcuate inner surface that is complementary with an arcuate outer surface of the diaphragm and extends along a portion of the arcuate outer surface of the diaphragm.

Abstract: A magnetic assembly and a loudspeaker a magnetic assembly. The magnetic assembly has a pole piece that is designed to form an outer air gap and an inner air gap for coaxial voice coils of the loudspeaker. The same magnet is used for the magnetic circuits of the two voice coils. The pole piece is shaped to split the magnetic circuits into a low frequency magnetic circuit and a high frequency magnetic circuit. A convex dome is attached to the high frequency voice coil.

Abstract: A loudspeaker includes a circuit board, a base mounted on a rear side of the circuit board, a positioning apparatus slidably installed between the base and the circuit board, a sound-reflecting member positioned at a front side of the circuit board, a connecting member connected between the base and the sound-reflecting member, a sound generator, and a controller. The sound-reflecting member includes a sound-reflecting plate and a number of magnetic pieces around the sound-reflecting plate. Many first electromagnets are mounted on the front side of the circuit board, aligning with the magnetic pieces. The position apparatus includes a positioning bracket. The connecting member includes a rotating portion rotatably connected to the base. A second electromagnet is mounted to the circuit board, to move the positioning bracket. The controller controls one or more of the first electromagnets to attract the corresponding magnetic pieces, to allow the sound-reflecting member to swing.

Abstract: A pedestrian alert system includes, a noise producing member having a primary acoustic output surface configured and disposed to direct noise from the noise producing member along a first axis, and at least one secondary acoustic output surface that allows noise to pass from the noise producing member along a second axis that is distinct from the first axis. An acoustic focusing member is provided about the noise producing member. The acoustic focusing member is configured and disposed to re-direct noise from the second axis toward the first axis.

Abstract: A loudspeaker including an acoustic waveguide includes an enclosure, an acoustic transmission line formed within the enclosure, and a plurality of acoustic transducers contained within the enclosure and disposed along a length of the acoustic transmission line. Each acoustic transducer is configured to emit acoustic energy directly into the acoustic transmission line at two separated locations along the length of the acoustic transmission line.

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 includes a horn including a first end panel, a second end panel, a first side panel, and a second side panel. Edges of at least the first and second side panels define a diffraction slot opening. The first and second side panels are each fabricated from a sheet of flexible material held in a stressed, curved shape by at least a rigid support member. The panels are designed by an automated process based on a number of electro-acoustic transducers to be used in a loudspeaker, horizontal and vertical coverage angles for the loudspeaker, and a wall length for a horn of the loudspeaker.

Abstract: A speaker system with an enclosure having a spiral pathway is presented. The speaker system includes an electro-acoustic transducer that generates sounds according to an audio input. The speaker system also includes an enclosure having an interior pathway defined by a wall that is curved substantially as a spiral. The speaker system is configured such that the sound generated by the electro-acoustic transducer travels along at least a portion of the curved pathway before leaving the enclosure.

Abstract: A loudspeaker apparatus has at least one sound generator wherein an at least partially sound-conducting channel is arranged in a sound radiation direction of the sound generator and is suitable for directing sound emerging from the sound generator along the course of the sound-conducting channel such that the sound emerges from the loudspeaker apparatus at a second end of the sound-conducting channel, which end is in the form of a sound outlet opening, at a radiation angle which defined by the sound outlet opening.

Abstract: In a low frequency transducer system a multi-compression chamber, an inverse horn structure is employed in combination with a resonance-distortion filter chamber. The filter chamber effectively expands the effective enclosure volume at low frequencies and connected to one of the compression chambers filter parasitic resonances and distortion and allowing the system to more efficiently reproduce low frequencies while being able to use smaller diameter transducers and maintaining good system sensitivity. Compression chambers are organized for constant or continuous compression on a section-by-section basis throughout the inverse horn system.

Abstract: A combined passive acoustic speaker and stand for a portable, handheld electronic device includes a block with an inclined slot in the side oriented at an acute angle with respect to a bottom of the block to receive and retain a portion of the portable, handheld electronic device therein at an acute inclined angle with respect to a support surface. An aperture in the bottom of the slot extends through the side of the block and into a hollow therein. The hollow includes a non-symmetrical, arcuate-axis, frusto-conical horn with a larger forward sound outlet opening in the front of the block and a smaller rearward sound inlet opening in a rear of the horn open to the aperture in the bottom of the slot.

Abstract: A combined passive acoustic speaker and stand for a portable, handheld electronic device includes a block with an inclined slot in the side oriented at an acute angle with respect to a bottom of the block to receive and retain a portion of the portable, handheld electronic device therein at an acute inclined angle with respect to a support surface. An aperture in the bottom of the slot extends through the side of the block and into a hollow therein. The hollow includes a non-symmetrical, arcuate-axis, frusto-conical horn with a larger forward sound outlet opening in the front of the block and a smaller rearward sound inlet opening in a rear of the horn open to the aperture in the bottom of the slot.

Abstract: An electric horn (1) has a coil bobbin (4) in a casing (2). A fixed iron core (3) is fixed in a hole (4f) in the coil bobbin (4) and is magnetized to define an exciting coil (C). A moving iron core (10) is at the center of a diaphragm (9) at the open end of the casing (2) and faces the fixed iron core (3). The moving iron core (10) is displaced relative to the fixed iron core (3) by a power supply of the exciting coil (C); thus beeping an alarm. The moving iron core (10) has an end face toward the fixed iron core (3) that strides over a reference position (N) within the amplitude (W) of the moving iron core (10). The end portion on the moving iron core (10) side of the wound portion (4e) of the exciting coil (C) is the reference position (N).

Abstract: Spherical sound source comprising two coaxial loudspeakers and two mid-high frequency compression drivers. Low frequencies are radiated by the two low-frequency sections of the coaxial loudspeakers. Mid-frequencies 500 Hz-2000 Hz are radiated by the two mid-high frequency compression drivers. High-frequencies 2 kHz-10 kHz are radiated in the horizontal plane by the same mid-high frequency arrangement together with two compression drivers of the coaxial loudspeakers in each vertical direction. Identical drivers form three pairs. One driver from each pair is enclosed in one of two symmetrically opposite half-embodiments, spaced at predetermined distance to create a common radially expanding horn for the two mid-high frequency compression drivers. All loudspeakers share the same vertical axis of rotational symmetry. The two half-embodiments might be used as separate standalone spherically radiating sources when installed on hard surface.

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 loudspeaker assembly, including an acoustic waveguide; an acoustic driver mounted in the waveguide so that a first surface radiates sound waves into the waveguide so that the sound waves are radiated from the waveguide; and an acoustic volume acoustically coupled to the acoustic waveguide for increasing the amplitude of the sound waves radiated from the acoustic waveguide.

Abstract: There is provided a dock without a power source for a portable digital device with at least one integrated speaker driver. The dock may include a platform for placement of the portable digital device; a protrusion located at the platform for connection of the portable digital device with the dock with the protrusion including a slot for egress of air from at least one hole in a casing of the portable digital device to the dock; and at least one primary chamber to receive air from the portable digital device with the at least one primary chamber having a vented port for the egress of air. Advantageously, sound from the at least one integrated speaker driver is amplified when the portable digital device is connected to the dock. The connection of the portable digital device with the dock may be securable.

Abstract: A sound reproduction system is disclosed in which at least one driver is provided, along with a horn member in acoustic loading relationship to the driver. The horn member defines an internal passageway having a first end and a second open end, with the driver at the first end, producing a driver soundwave having an initial central axis and an initial amplitude distribution. A plurality of vanes are disposed in the internal passageway, at different angles from the central axis to deflect respective portions of the driver soundwave so as to alter the initial amplitude distribution.

Abstract: The present invention is an acoustic traveling wave tube system for propagating a directional acoustic wave comprising an acoustic traveling wave tube having a cylindrical shape with a load on one end of the tube, a plurality of excitation rings positioned around a circumference of the tube and spaced at predetermined intervals along a length of the tube and a microprocessor having a database containing a plurality of waveforms representative of acoustic signals. The microprocessor energizes one of the plurality of excitation rings to form an acoustic wave, sequentially energizes one or more of the remaining excitation rings along the length of the tube to amplify the acoustic wave as the acoustic wave travels along the length of the tube, and propagates the acoustic wave from an end of the tube opposite the load as a shaped directional acoustic wave.

Abstract: A loudspeaker assembly, including an acoustic waveguide; an acoustic driver mounted in the waveguide so that a first surface radiates sound waves into the waveguide so that the sound waves are radiated from the waveguide; and an acoustic volume acoustically coupled to the acoustic waveguide for increasing the amplitude of the sound waves radiated from the acoustic waveguide.

Abstract: A loudspeaker assembly comprises a base supporting at least one electro-acoustic transducer and at least one waveguide segment detachably supported by the base.

Abstract: An accessory for a portable electronic device having a speaker uses an acoustic wave guide to passively amplify and direct the output of the device's speaker. The accessory has a housing with a docking cavity formed therein. The docking cavity has supportive sidewalls that are adapted to receive and support the portable electronic device in an upright position. A cable access channel is formed in the docking cavity that allows a connector and cable to be coupled to the portable electronic device when the portable electronic device is mounted in the docking cavity. An acoustic waveguide having a spiral shaped acoustic chamber is positioned in the housing such that an entrance to the acoustic waveguide corresponds to a hole in the docking cavity that is positioned to correspond to the location of the speaker of the device when the device is mounted in the docking chamber. The exit of the acoustic chamber corresponds to an exterior opening in a sidewall of the housing and the hole in the docking cavity.

Abstract: A transmission line speaker enclosure featuring a main enclosure, a speaker driver and an exit port in the main enclosure, exit port walls extend from the exit port into the main enclosure; and an inner sub enclosure in the main enclosure having a curved vertex facing the speaker driver and walls extending from ends of the vertex, the vertex has an angle between about 40 to 80 degrees, the vertex is either attached or separated from the magnet of the speaker driver by a gap, the vertex functions to divert sounds exiting the speaker driver between walls of the inner sub enclosure wall the main enclosure, then between the walls of the inner sub enclosure and the exit port and further out of the exit port, wherein back waves generated by the speaker driver can have total travelling distance of about ¼ wavelength of a tuned frequency.

Abstract: A loudspeaker for projecting siren and other warning signals which is compact to facilitate installation in emergency vehicles, and which provides a horn projector in the compact space. The loudspeaker has a support in which an electrically driven driver unit is mounted. A chamber providing a plurality of cyclonic or spiral paths for sound from the speaker is located at one end of the support as by being connected to the support or being a part thereof. The support has a plurality of passageways for sound from each of the paths to exit ports at an end of the support opposite to the end thereof attached to or having the chamber. The cyclonic paths and the passageways are of like length and taper so that the sound from the exit ports combined in reinforcing relationship and projects outwardly from the exit port end of the support. The support provides a recombiner for the sound propagating along the cyclonic paths and passageways to provide the effect of a long horn in the compact space.

Abstract: A loudspeaker enclosure has a first aperture in which a driver can be mounted, the driver having a first resonant frequency. A second aperture defines a port extending between the interior and the exterior of the enclosure. The port is tuned to a second resonant frequency. A sound absorbing element comprises at least one exponentially tapered horn having a mouth in communication with the interior of the enclosure. The horn has a cut-off frequency equal to or greater than the resonant frequency of the port, and preferably two to four times greater. The horn can be defined by tapering external walls of the enclosure, or by structures located within the enclosure which define a plurality of individual horns. The described enclosure combines the benefits of ported enclosures with those of enclosures employing tapered sound absorbing elements.

Abstract: A sound projecting bumper may include a vehicle bumper configured to be attached to a vehicle, the bumper comprising a plurality of uprights and at least one generally horizontal member, the bumper further comprising a horn for emitting sound, the horn comprising a driver, a cone, a speaker and a diaphragm for producing the sound, and wiring to connect the bumper device to the vehicle's electrical system. The horn may be configured to focus sound particularly forward of the vehicle. The driver may be attached to one of the uprights, and the bumper may include a second driver attached to a second one of the uprights. The horn may be generally aligned with one of the uprights, or the horn may be formed in a generally horizontal member. The bumper may further include a channel in the generally horizontal member, wherein the channel extends generally along a portion of the generally horizontal member, turning to form the horn.

Abstract: In a low frequency transducer system a multi-compression chamber, an inverse horn structure is employed in combination with a resonance-distortion filter chamber. The filter chamber effectively expands the effective enclosure volume at low frequencies and connected to one of the compression chambers filter parasitic resonances and distortion and allowing the system to more efficiently reproduce low frequencies while being able to use smaller diameter transducers and maintaining good system sensitivity. Compression chambers are organized for constant or continuous compression on a section-by-section basis throughout the inverse horn system.

Abstract: A horn apparatus comprises a high frequency horn housed within a low frequency horn. High frequency and low frequency drivers are positioned side by side and are at substantially the same distance from a reflective surface. Sound emitted by both drivers strikes this same reflective at approximately the same position and the low frequency and high frequency sound is reflected at the same angle. The sound emitted by both drivers is thus time aligned and superposition of sound at the same frequencies from both drivers will not cancel out or cause significant interference and sound distortion.

Abstract: The present invention essentially comprises a horn separated into a plurality of sections, wherein the horn is supported by a mounting bracket that may be both rotatable and pivotable and wherein the horn is made of two portions wherein the general middle is used as the attachment point to a bracket while both ends are also supported by the bracket.

Abstract: In a low frequency transducer system a multi-compression chamber, inverse horn structure is employed in combination with a resonance-distortion filter chamber. The filter chamber effectively expands the effective enclosure volume at low frequencies and connected to one of the compression chambers filter parasitic resonances and distortion and allowing the system to more efficiently reproduce low frequencies while being able to use smaller diameter transducers and maintaining good system sensitivity. Compression chambers are organized for constant or continuous compression on a section-by-section basis throughout the inverse horn system.

Abstract: A horn based loudspeaker system provides control over peak to peak pressure of an acoustic signal across its frequency spectrum. Frequency spectrum matched acoustic energy added to the acoustic signal at diverse points distributed along the horn.

Abstract: The present invention belongs to the field of loudspeaker and relates to directional sound wave radiator comprising a sound transmission duct, a reverser, an annular director, a parabolic reflector, and a straight tubular loudspeaker cylinder. The sound transmission duct is mounted substantially coaxially with said parabolic reflector. The straight tubular loudspeaker cylinder is connected to said parabolic reflector. The reverser is provided inside said straight tubular loudspeaker cylinder and at the outlet end of said sound transmission duct; the outlet end of said reverser has an annular section, which is substantially perpendicular to the axis of said parabolic reflector and is positioned substantially at the focus of said parabolic reflector. The annular director is mounted around said sound transmission duct and at the outlet end of said reverser to define an annular shape of the outlet end of said reverser.

Abstract: In a hearing aid, a main body case has a fitting-use first communication terminal provided inside the main body case, so that the first communication terminal can be visually checked when the battery case is removed by turning, and the battery case has a first locking protrusion that is engaged with the main body case and a pressing protrusion that is opposite the first communication terminal, when the battery case is turned for installation.

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: A loudspeaker assembly is described suitable for flown arrays and incorporating a horn load planar or ribbon transducer. Planer acoustic transducers have a relatively limited power output capacity. Addition of a horn suitable for an elongated source effectively amplifies the power output capacity of the planar devices.

Abstract: A single folded, expanding horn loudspeaker reproduces low frequency audible sound at high power output levels. A compact enclosure houses a plurality of identical transducers, characterized by small vibrational surface areas. The throats for each transducer into the horn are acoustically differentially spaced from the mouth of the horn with the spacing between adjacent throats progressively increasing in the acoustic direction of the horn mouth from the throat origin.

Abstract: The invention relates to a public address system including one or more loudspeakers, each of which is in particular equipped with a section for reproducing high-frequency sounds, including a wave expansion guide, which receives, at its input sound waves coming from a transducer and having, projecting in a plane, a form opening outwards from its input to its output for distributing, in a solid transmission angle, the sound waves coming from the expansion guide. According to the invention, the expansion guide includes one or more mobile flaps that can be moved by a movement made parallel to the plane, so as to enable the solid transmission angle of the sound waves to be adjusted.

Abstract: The disclosure relates to a satellite speaker system wherein the horn mouth of a main speaker, typically of a folded horn design, is divided by braces into satellite speaker storage chambers. This allows the satellite speakers to be placed into the storage chambers for storage and transportation, and then easily removed and placed into their remote locations for a show, performance or gig.

Abstract: A low frequency folded horn enclosure intended for use in proximity with at least one planar surface with access to the horn throat from the top of the enclosure. The horn is bifurcated at the throat and folds horizontally around a central trapezoid-shaped columnar back chamber which includes a phase-inverting means. The throat channel expands vertically to the single fold and expands vertically and horizontally to the horn mouth, maximizing back chamber volume within the constraints imposed by footprint size, frequency response, and driver characteristics.

Abstract: A low frequency exponential bass horn enclosure employing a bifurcated horn pathway and twin throats, convertible to a variety of front-loaded or rear-loaded configurations without modifications by the use of interchangeable parts, with driver access typically from the front. Optimized for corner placement but fully enclosed horn channel allows for floor or wall use. The horizontal “butterfly” throat is located at the rear of the enclosure and expands vertically, and the vertically arranged horn terminus exhausts in forward-canted splay angles around a partially rectangular back chamber.

Abstract: A sound reproduction system (10) is disclosed in which a sound barrier (14) defines a horn passageway having an upstream (22) and a downstream section (24). A driver (12) is mounted at the throat (16) of the upstream section (22) so that its rearward directed output communicates with the downstream section (24). Output from the upstream section and the rearward directed output of the driver are merged at a tap point located at the beginning of the downstream section. By altering the respective areas and lengths of the upstream and downstream sections a variety of different frequency dependent responses are obtained. In one example, low-frequency response systems of heretofore unobtainable compact size are realized.

Abstract: A low frequency exponential bass horn enclosure employing a large area unitary throat pathway, bifurcated at a substantially parabolic rearward channel wall, convertible to a front-loaded or rear-loaded configuration by the use of interchangeable parts, with driver access from the front. Intended for corner placement, however, fully enclosed horn channel allows for floor use. The axially-centered throat expands vertically, exhausts rearward, and is bifurcated at the back of the enclosure with two hard reflection points, comprising a single fold, in which the vertically arranged horn terminus exhausts with a forward-canted splay angle around a partially rectangular back chamber.

Abstract: A single folded, expanding horn loudspeaker reproduces low frequency audible sound at high power output levels. A compact enclosure houses a plurality of identical transducers, characterized by small vibrational surface areas. The throats for each transducer into the horn are acoustically differentially spaced from the mouth of the horn. Transducer drive circuitry adjusts a drive signal for the transducers to compensate for the different impedance and propagation time to the horn mouth at each throat.

Abstract: A speaker comprises an enclosure with at least one wall; and an acoustic driver mounted in an interior of the enclosure and being attached to a front wall of the enclosure. An acoustic extension is mounted to the enclosure and is external of the enclosure. The acoustic extension is operatively connected to the interior of the enclosure; and comprises one of: a bass reflex port, a tuned port, a passive radiator, and a concentric loading.

Abstract: A low frequency exponential/hyperbolic hybrid folded horn enclosure intended for use in proximity with at least one planar surface, such as a floor, ceiling, or wall, with access to the horn throat from the top of the enclosure. The horn is bifurcated at the throat and folds horizontally around a central trapezoid-shaped vertical back chamber which is reflex ported for enhanced low frequency response below the frequency cutoff of the horn. The back chamber outer sides define part of the horn channel, resulting in a relatively simple structure with a small footprint and no void internal space. The throat exponential expansion cross-sectional area is consistently maintained while the proportions of the throat channels are elongated to the height of the enclosure.

Abstract: A speaker apparatus is a bass-reflex type woofer used in a speaker system, and includes a body portion for housing a speaker unit and a bass-reflex port mounted and fixed in the body portion. Further, in the speaker apparatus, a protrusion for temporarily fastening the bass-reflex port in the case of mounting and fixing the bass-reflex port is provided in the body portion.

Abstract: A low frequency exponential horn enclosure intended for corner use with access to the horn throat and entire volume of the back chamber from the top of the enclosure, allowing operation as either a front or back loaded horn. The horn is bifurcated at the throat and folds horizontally around a central triangle-shaped columnar back chamber, the sides of which form part of the horn channel, forming a simple structure with little void space.

Abstract: A horn loudspeaker includes a horn housing having a top wall, an inner surrounding wall that extends downwardly from the top wall, a bottom wall that extends laterally and outwardly from the inner surrounding wall, and an outer surrounding wall that extends upwardly from the bottom wall. A cover has a top wall disposed over the top wall of the horn housing, and a surrounding wall that extends downwardly from the top wall of the cover into a gap between the inner and outer surrounding walls. Partitioning members are connected sealingly to the horn housing and the cover so as to define a plurality of sound channels thereamong. A sound-generating driver is adapted to be mounted in the horn housing for generating acoustic pressure wave which propagates through the sound channels.

Abstract: A flush mountable ceiling speaker (10) with individual coaxial waveguides (20, 22) for both the lower and high-frequency transducers (11, 12). The lower frequency radiation is combined with the sonic energy radiated by the high-frequency transducer (12) and shaped by the high-frequency waveguide (20) to create a coherent, uniformly controlled coverage pattern. The loudspeaker (10) creates a well defined sound dispersion pattern over a relatively large bandwidth, resulting in increased vocal intelligibility and more accurate reproduction of music at relatively great distances from the loudspeaker, as is particularly useful in association with high ceiling installations.