Abstract: A tablet holder includes a holding frame and fasteners at corner regions of the holding frame by which a variety of tablets of differing size can be secured to the holding frame. The fasteners include straps for passing over the corner regions of the tablet. A number of selectable anchor points are provided at the holding frame corner regions from which the straps can extend, each being selectable depending on the dimensions of the tablet.

Abstract: An Audio enhancer apparatus for smart phones and smart tablets that is portable, attachable and detachable to an audio producing device providing a richer, louder and pseudo stereo listening experience without the need of electricity or any other types of power source.

Abstract: A loudspeaker device comprising: a loudspeaker and a reflecting member positioned opposite to the loudspeaker, the loudspeaker comprising an electromagnet actuator, a dish-like frame and a vibrating drum, the electromagnetic actuator being attached on one side of the frame, the vibrating drum adhered to an inner side of the dish-like frame, the electromagnetic actuator being configured for driving the vibrating drum to vibrate, the vibrating drum being configured for generating sound of different frequencies and intensities; and the reflecting member shaped in a bowl configuration, comprising a concave shaped reflecting surface opposite to the vibrating drum; wherein the area of the reflecting surface is larger than an area of the vibrating drum.

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: A broadband sound generator and transmitter provides minimal attenuation of sound over the distance between the generators and a point at a selected distance. The transmission component includes a parabolic dish and a positionable framework for the sound generators. The sound generators are positioned in front of the dish and oriented to direct sound into the dish for reflection toward a target. Drive signal conditioning circuitry apportion components of the drive signal to the several sound generators and adjust the signal in terms of delay and phase to accommodate changes in position of the generators relative to the dish.

Abstract: A middle to high frequency straight pathway horn with wide horizontal dispersion characteristics having extended terminus side walls which approach a perpendicular angle compared to the horn axis which are further extended by a rearwardly divergent angled or curved surface from the terminus frontal plane to reduce the deleterious effects of horn mouth, edge, and baffle diffraction, allowing for traditional front baffle mounting or free-standing use. Modular baffle elements allow the invention to be configured for the further reduction of diffraction effects in a variety of applications.

Abstract: The sound generating and transmitting apparatus is based on a radiator including at least a first, and possibly two or more, shaped reflecting surface(s) having a forward radiant axis. Each of the shaped reflecting surfaces defines sets of equivalent acoustic input locations, with each set being a ring of non-zero circumference centered on the forward radiant axis. The sound source is a distributed, functionally continuous sound source adapted to exploit this feature. In its preferred form the sound source is a sort of closed line array of loudspeakers providing a torodial shaped acoustic source to direct at the hyperbolic cone, the transducers being disposed in a circle with all of the loudspeakers oriented inwardly toward or outwardly from the forward radiant axis.

Abstract: The sound generating and transmitting apparatus is based on a radiator including at least a first, and possibly two or more, shaped reflecting surface(s) having a forward radiant axis. Each of the shaped reflecting surfaces defines sets of equivalent acoustic input locations, with each set being a ring of non-zero circumference centered on the forward radiant axis. The sound source is a distributed, functionally continuous sound source adapted to exploit this feature. In its preferred form the sound source is a sort of closed line array of loudspeakers providing a toroidal shaped acoustic source to direct at the hyperbolic cone, the transducers being disposed in a circle with all of the loudspeakers oriented inwardly toward or outwardly from the forward radiant axis.

Abstract: The sound generating and transmitting apparatus is based on a radiator including at least a first, and possibly two or more, shaped reflecting surface(s) having a forward radiant axis. Each of the shaped reflecting surfaces defines sets of equivalent acoustic input locations, with each set being a ring of non-zero circumference centered on the forward radiant axis. The sound source is a distributed, functionally continuous sound source adapted to exploit this feature. In its preferred form the sound source is a sort of closed line array of loudspeakers providing a torodial shaped acoustic source to direct at the hyperbolic cone, the transducers being disposed in a circle with all of the loudspeakers oriented inwardly toward or outwardly from the forward radiant axis.

Abstract: The invention concerns a mobile membrane loudspeaker equipped with a partial closure optimising its radiation. The invention is characterised in that the loudspeaker with mobile diaphragm (19) attached to a rigid frame (15) defining an acoustic emission plane (P) comprises a closure (25) for only one central zone of said emission plane.

Abstract: A loudspeaker horn (11) having a throat end (13) for receiving acoustic power from aligned acoustic power sources (41, 43, 45), an elongated throat (33), and a flared section (17) is provided with grating lobe mitigation fins (27, 29) that extend substantially parallel to the propagation axis of the horn from the throat end toward the mouth end of the horn's flared section. The length of the grating lobe mitigation fins is established in accordance with the degree of suppression of the grating lobes produced by the aligned acoustic power sources that is desired.

Abstract: This invention provides a lens system for a loudspeaker. The loudspeaker may include a driver unit and a waveguide attached to the driver unit. The loudspeaker further may include a lens system. The lens system may include a plurality of plates. The plates may be positioned to divide an interior of the waveguide into a plurality of acoustic paths of substantially equal length. The acoustic paths may bend the propagation of one or more acoustic elements of a sound wave so that each acoustic element arrives at a plane substantially at the same time.

Abstract: A horn including a substantially flat coupling flange defining a coupling flange plane, a substantially planar mouth defining a mouth plane, an elongated throat extending between the coupling flange and the mouth, a transducer for generating a sonic output operationally connected to the coupling flange, and a major axis extending through the elongated throat. The coupling flange plane and the mouth plane are nonparallel and define a horn angle. The major axis connects the coupling flange and the mouth and the elongated throat is characterized by a substantially steadily increasing sectional area along the major axis from the transducer-connecting end to the mouth connecting end.

Abstract: A loudspeaker apparatus in which sound from a loudspeaker is emitted from a top surface of a loudspeaker cabinet, wherein the top surface is slanted obliquely backward and in which a sound reflecting panel is mounted such that that the panel can swing on the rear plate of the loudspeaker cabinet, so that the emitted sound is reflected by the panel toward the listener.

Abstract: A horn or waveguide public address unit, enabling to adapt the dispersion characteristics of the horn or waveguide. The unit is provided with at least one profiling component (21a, 21b) constituting a removable dispersion shaper, capable of being mounted on the inner wall of the horn (13) or waveguide between the throat (17) and the mouth (19) thereof.

Abstract: A sound system employing wide band loudspeakers, which includes one or more loudspeakers constructed to be placed and housed one inside the other in a closed configuration for transporting and storing and to be detached one from the other and positioned in different combinations in a combined functional configuration.

Abstract: An improved speaker enclosure system and method is described which includes extending the existing baffle of a speaker enclosure on either side. Ideally, the ratio of the height of the baffle should be 1.4 times the internal depth of the enclosure, and the width of the baffle and baffle extensions should be 1.6 times the internal depth. These ratios change for different driver configurations. The result is improved dispersion angle and perceived dimensionality of the sound produced.

Abstract: The invention relates to a waveguide loudspeaker with adjustable controlled dispersion which comprises a duct fonned by flat, concave or convex walls round a diffraction throat, and which finishes in a mouth and where reflection can occur before or after the diffraction throat. The mouth is folded back in relation to the throat and has dimensions and shape chosen for the simultaneous application of at least two of the three fundamental principles for sound diffusion, namely diffraction, reflection and absorption. Also, the invention concerns a method to obtain a loudspeaker having means to vary and set at least the degree of diffraction and reflection for the reproduction of wide bands of mid/high frequencies with a limited horn or waveguide length.

Abstract: A sound reproduction system is disclosed which minimizes unwanted acoustic reflections and the resulting comb-filter effects but which still maintains a broad and uniform directional characteristic throughout the region in the listening room in which listening positions are located.

Abstract: The invention concerns improvement to a horn or waveguide public address unit, enabling to adapt the dispersion characteristics of said horn or waveguide. The invention is characterised in that it is provided with at least one profiling component (21a, 21b) constituting a removable dispersion shaper, capable of being mounted on the inner wall of the horn (13) or waveguide between the throat (17) and the mouth (19) thereof.

Abstract: A backload horn-type omnidirectional speaker is provided wherein deterioration of sound due to wound horn portions is prevented such that the listener can enjoy natural sounding music regardless of the position from which the music is listened to.

Abstract: The present invention provides a loudspeaker capable of matching a sound image and a picture image on a screen of an image reproducer with each other in simple construction and a simple method of installation. The loudspeaker is located above the image reproducer in the vicinity thereof and so constructed as to reproduce a center channel signal in a multichannel sound signal for a movie or the like as a principal object, which comprises a main speaker unit, particular band preventing means for suppressing the level of a particular band in a band of not less than approximately 4 kHz of the main speaker unit, a sub-speaker unit, particular band passing means connected to the sub-speaker unit for passing only the particular band, and a dispersing device located on a front surface of the sub-speaker unit and so constructed that a reproduced sound radiated from the sub-speaker unit is mainly composed of a diffused sound.

Abstract: A sound output system has a pair of right and left speakers and a pair of audio mirrors for respectively controlling directivities of sounds which are output from the pair of speakers. The shapes or arrangement of the pair of audio mirrors are adjusted such that a difference between arrival times of the sounds which are respectively output from the pair of speakers can be compensated by a sound pressure difference due to the Haas effect in a predetermined area. Alternative means are phase difference, dipole, and asymmetrical horn loading.

Abstract: A sound A is emitted from respective left- and right-hand front speakers which are provided on a television set, in a front direction, while, regarding respective side speakers which are provided respectively on left- and right-hand sides of the television set, reflectors each having substantially a semi-conical shape are provided so as to face to a forward direction of one-side faces of respective speaker diaphragms, to radiate sounds B due to the side speakers, in the front direction. In other words, in addition to the sound A in the front direction which are emitted from the left- and right-hand front speakers, the sounds B due to said side speaker are radiated in the front direction at positions at which a sound radiated position is different in vertical direction, and in backward and forward direction from this sound A.

Abstract: A cabinet for a loudspeaker with a preferably circular cross-section, in which the loudspeaker is closed on the front side substantially flush with one side of the cabinet and wherein means are provided for positioning the cabinet, wherein, starting from the periphery of the loudspeaker, the cabinet expands all round obliquely towards the rear for a specific distance, and in which the oblique surface consists of a plurality of oblique partial surfaces arranged at differing shallow angles side by side and/or one behind the other, and the cabinet tapers rearwardly of the specific distance towards the rear so as to be closed.

Abstract: This disclosure relates to a sound system that provides high quality sound notwithstanding extreme background noise. Preferably implemented in amusement ride vehicles, such as roller coasters, the present sound system mounts left and right channel sets of speakers in each seat back, one on each side of a center section that supports the passenger's back. These speakers are mounted in a wing-back relationship, such that they direct their sound away from one another and toward laterally extending arms that extend forward from the seat back, outside of the speakers. These arms mount an inward-facing spherical reflector, which reflects and disperses sound toward a range of positions associated with height variance of the passenger. Using this arrangement, all passengers will experience the same high quality sound, whatever the passenger's height. The left and right channels speakers are each coaxially-mounted, two-way speakers.

Abstract: Disclosed is a sub-woofer module which has a simple construction and provides a good low-frequency bass in compliance with an audience's taste. The sub-woofer module has an enclosure, a baffle board which separates the enclosure into first and second chambers, and a speaker coupled to the baffle board. The baffle board is engaged with a screw shaft and moves upward and backward along the screw shaft to vary the volume of the first and second chambers. A reverse-conical cap is disposed above the enclosure to permit the upwardly projected sound to be projected in 360 degrees, and a conical base is disposed below the enclosure to permit the downwardly projected sound to be projected in 360 degrees. The audience can listen to sound of the same quality regardless their position in relation to the sub-woofer module.

Abstract: A sound reflector device for symmetrical association, in spaced relationship, with the bell or sound-emitting end or any other orifice of a musical instrument whereby a portion of sound is reflected rearwardly from the sound-emitting end of the instrument towards the ears of the player.The sound reflector permits the playing of a musical instrument whereby the player, because of the rearwardly reflected sound, has a truer appreciation of the sound being emitted.

Abstract: The horn housing may comprise an inner metal shell in the shape of a hexagonal box open at one end fitting into a similarly shaped outer dense solid box similarly open at one end. Space between the inner and the outer boxes being filled by a low density sound absorbing filler, and the inner box being connected to the outer box by vibration absorbing bolts. The outer box is mounted to a structure by vibration absorbing mounting brackets. When a high decibel horn or siren is mounted in the inner box to directed sound through the opening, most of the sound propagating sideways towards the structure is absorbed by the housing increasing the comfort level of passengers or crew inside the structure.

Abstract: A sound anti-muffler provides at least one sound channel to permit sound from a sound generator to travel sideways to the outside air even though a hand is placed over the sound anti-muffler in an attempt to muffle the sound.

Abstract: Monophonic sound is transformed into a stereo pattern by arranging two reflectors on a common axis at a predetermined distance from each other with both facing in the direction of the sound. One reflector has a larger diameter than the other and is provided with a central aperture into which a tone generator is mounted and spaced from the smaller reflector.

Abstract: A vehicle warning system (1) is disclosed. The device includes a main housing (2) to which is attached a sound generator (7), a lighting system (4), a mounting bracket (4) which is used to attach the device to an emergency vehicle, and a trim ring (6) which conceals the structure for mounting the device. As a sound signal is produced by the generator (7) it passes through a nozzle (9) and an aperture (14) into a deflector means (3) which is designed to expand and direct the sound signal through carefully proportioned chambers (30) and (33) of the deflector (3) so as to direct the sound signal against the closed portion (15) of expander horn (16) and out the open portion of the expander horn (16). In operation the sound generating system is attached to an amplifier of well known design and is capable of producing a variety of sound signals.

Abstract: A sound output system has a pair of right and left speakers and a pair of audio mirrors for respectively controlling directivities of sounds which are output from the pair of speakers. The shapes or arrangement of the pair of audio mirrors are adjusted such that a difference between arrival times of the sounds which are respectively output from the pair of speakers can be compensated by a sound pressure difference due to the Haas effect in a predetermined area. Alternative means are phase difference, dipole, and asymmetrical horn loading.

Abstract: A baffle for enlarging the field of view of and enhancing collection of radiation for a sensor apparatus having a transducer for receiving radiation within its field of view. The baffle includes a base securable proximate the transducer, and at least one blade element extending from the base outwardly from the transducer. The base element includes a proximal edge transecting the transducer to establish at least two apertures for the transducer for enlarging its field of view. The blade element is reflective for the radiation to enhance collection of the radiation from a periphery of the enlarged field of view.

Abstract: A siren having one or more stacked speakers, each speaker having a substantially circular lower horn member having an upwardly facing surface including a substantially convex annular portion and a substantially concave central cavity portion. A substantially circular upper horn member having a downwardly facing surface including a substantially convex annular outer portion and a central opening, is spaced above the lower horn member, thereby defining an annular, radially outwardly diverging sound director between the upper and lower horn members. A diffuser horn is coupled to a central opening in the upper horn member and projects downwardly into the cavity portion of the lower horn member. A siren driver is mounted in the upper horn member adjacent to the central opening for projecting a sound wave through the diffuser horn into the cavity, where the sound wave is reflected upwardly out of the cavity into the sound director, through which the sound is projected horizontally in a 360.degree. pattern.

Abstract: An omnidirectional sound emitter with separate sound sources (1, 2), each comprising a funnel-shaped horn (4), is characterized in that the sound sources (1, 2) are mutually arranged such that the acoustic main axes (6) of the horns (4) lie in essentially one and the same plane (7) and the sound-emitting open ends (8) of the horns are directed towards the central portion of the sound emitter and located at a distance (B.sub.S ; B.sub.D) from one another. Slot-shaped openings (9) are so arranged between the open ends (8) of adjacent horns (4) that sound emitted by the horns is caused to pass in a direction from the sound emitter through the slot-shaped openings (9), thereby to be dispersed through 360.degree. in the said plane (7) such that the sound representation from the sound emitter corresponds to the sound representation from a line source perpendicular to said plane (7).

Abstract: An electronic horn of compact dimensions. Oscillator circuits coupled to a mixing node produce a multiple frequency signal used to drive a horn transducer. One horn replaces the two horns used in the prior art. A reverberating chamber in close proximity to the transducer includes a cone shaped structure having multiple spiraling reflecting walls connected to the convex surface of the cone. Sound waves emitted by the transducer reverberate within the chamber as they bounce off the reflecting walls.

Abstract: A moving coil loudspeaker of the type including a pair of co-axial speech coils, one for driving a high frequency diaphragm at the rear of the loudspeaker to provide an output along a horn and the other for driving a cone forming a continuation of the horn and reproducing the lower frequencies has an acoustic lens fitted in the region where the horn contour is taken over by the cone, the lens being shaped over its external surface so as to conform snugly with the contour of the cone and being effective to increase the divergence of the beam of acoustic radiation from the horn in the operative plane of the lens. The acoustic lens is preferably so designed that the divergence of the acoustic beam from the horn matches that from the cone and may be of the slant-type, being held by a cruciform mounting extending across the mouth of the horn proper.

Abstract: An acoustical panel formed of a core of sound-attenuating material having a front and a back surface. The edges of the core are resin-hardened for rigidification. The core is covered by a fabric stretched over its front surface adhered to the hardened edges and to the back surface. A board cover is fixed on the back surface over the core and the ends of the fabric.In other versions of the invention, the core is reinforced by having its edges encased in a frame to which it is secured by the resin. The fabric is stretched over the frame and core thereby forming an air gap between the fabric and the core which improves the acoustical efficiency of the panel and masks the outline of the frame. High-impact-resistant channel members of different shapes constitute the frame.

Abstract: A musical drum consisting of a generally cylindrical drum shell having openings at its upper and lower ends with a vibratable drum head covering at least the upper opening and a sound projector positioned below the lower opening, which sound projector is substantially a semi-hemisphere with an upper opening therein disposed adjacent the lower opening in the drum shell and with a horizontal opening therein facing in a direction substantially perpendicular to the openings in the drum shell. The half hemisphere sound projector may extend beyond the vertical center line of the shell and may be detachably secured to the shell and may be adjustable radially 360.degree. with respect thereto.

Abstract: An acoustic crossover speaker enclosure comprising a multi-sided box having an apertured baffle supporting a horn which in conjunction with the interior of the box defines an air chamber. The horn is supported in an upright position such that the throat of the horn opens at the baffle end of the box where the front end of a driver projects into the horn throat, while the back side of the driver projects into the air chamber of the box. The horn opens at the top end of the box wherein sound waves emitted from the mouth of the horn are laterally reflected by means of a sound deflector panel. The air chamber transmits sound from the rearward side of the driver to a bass reflex port in one wall of the box such that a sound radiated from the rear of the driver may be added to the sound emitted from the front of the driver.

Abstract: A panel of acoustically reflective material is removably supported on the bell of a wind instrument by a bracket which is jointed so that selectively the panel can be, (1) angularly positioned to reflect the sound back to the player or in other directions, (2) moved toward and away from the bell to adjust reflection of the sound, (3) moved to a muting position, and (4) moved to a non-reflecting location.

Abstract: In a moving-coil type loudspeaker, a tubular member of a length longer than the wave-length of any one of the frequencies in a desired frequency range and having a constant cross-sectional area along its length, is coupled, at one end thereof, with one side of a vibrating plate or diaphragm through an acoustic transformer constituted by a cavity formed therebetween, whereby the loudspeaker is capable of reproducing sounds with high fidelity particularly in extremely low frequency ranges.

Abstract: A loudspeaker horn has a conical section adapted to receive the driver assembly of a speaker system at the small cone end. An exponential section secured to the large cone end, concentrically with the cone longitudinal axis, flares outwardly to terminate in a square cross-section horn mouth. A raised lip secured around the periphery of the horn mouth diffracts sound symmetrically through a dispersion angle of about 120.degree. with a drop of about six decibels or less.

Abstract: A panel of acoustically reflective material is removably supported on the bell of a wind instrument by a bracket which is jointed so that selectively the panel can be, (1) angularly positioned to reflect the sound back to the player or in other directions, (2) moved toward and away from the bell to adjust reflection of the sound, (3) moved to a muting position, and (4) moved to a non-reflecting location.