Abstract: In accordance with the present invention, sound absorbing material is placed in close proximity to an acoustic horn to assist the horn in more effectively and distinctly placing the optimal SPL or major lobe in a desired location, thereby providing an improved sound field. In a first preferred embodiment, the sound absorbing material is arranged at the mouth just after or behind the horn. In a second preferred embodiment, the sound absorbing material is arranged at the driver end of the horn. Finally, in a third preferred embodiment of this invention, the sound absorbing material is disposed between the throat and the mount of the horn. Such an arrangement shapes the polar pattern to more closely resemble an acoustic wedge allowing improved placement of sound energy and for multiple acoustic sources to be arrayed together, thereby minimizing interference between or among the sources.

Abstract: A speaker has a substantially reduced size, is efficient in the low sound range and is unidirectional relative to the plane of installation or support of the speaker. The speaker includes a vibrator having a semispherical vibrating body made of a piezoelectric material polarized in a thickness direction. Electrodes are provided on the inner and outer surfaces of the vibrating body. A cavity is created inside of the vibrator. A sound path in the form of a horn includes inner parts of a first cylinder which communicates with the cavity, a second cylinder, a third cylinder, a fourth cylinder, a fifth cylinder and other cylinders. Cutouts functioning as openings of the sound path are disposed almost along the whole azimuth of the fifth cylinder at the outside of the horn relative to the plane of speaker support.

Abstract: An electro-dynamic acoustic transducer has a pleated diaphragm in which an accordion-like alternating movement of the adjacent pleats is perpendicular to the radiation (acoustic) axis of the transducer. Front and rear pole plates cooperate to provide a magnetic field across the active area of the diaphragm. Each pole plate may be a “magnetic throat” constructed from a unitary casting of a ferrous magnetic material (such as an iron silicon alloy) having a number of apertures. In an exemplary embodiment, the open area at the rear of the pole plate may be approximately ⅓ the active area of the diaphragm, thereby providing a compression ratio of 3:1. The apertures are substantially uniformly distributed over the effective area of the diaphragm, to provide uniform acoustical coupling and prevent the occurrence of acoustical resonances and standing waves along the diaphragm's length.

Abstract: An alarm device 10 incorporates a sounder 11 and a strobe 12. The sounder and the strobe are controlled by a circuit board 17 that is located within a single flameproof housing 13. A pressure unit 23 produces the sound for the device with the sound passing through a sintered disc 24 into an upwardly and outwardly diverging cone 25 from the top of which the sound is reflected outwardly and downwardly within a dome 26. A ramp 27 then assists in reflecting and emitting the sound.

Abstract: A buzzer includes a base with an upper opening, a vibrating plate fixed on the upper opening of the base, a sound film fixed flatly on the vibrating plate, and an equalizing or whirlpool sound mechanism for transmitting the sound produced by the vibrating plate to enhance dB of medium and high sound of a wide range and to reach far. Thus the buzzer has overwhelming sounding effect and sweet tone.

Abstract: An improved loudspeaker system which increases low frequency directivity and minimizes directivity discontinuities during frequency transitions includes a first low frequency transducer, a second low frequency transducer, a middle frequency transducer assembly and a middle frequency horn assembly having a small input aperture and a large output aperture. The middle frequency transducer assembly is attached at the small aperture of the horn assembly and directs a middle frequency acoustical signal into the horn assembly. The low frequency transducers and are mounted to opposite interior surfaces, preferably the top and bottom surfaces, of the horn assembly, and direct a low frequency acoustical signal into the horn assembly. A composite acoustical signal directed out of the horn assembly from the large aperture. The distance D.sub.1, measured from the upper transducer voice coil to the lower transducer voice coil, is substantially equal to 0.9048 of the distance D.sub.

Abstract: An improved horn-type loudspeaker system for reproducing an acoustical signal from a corresponding electrical signal includes transducer assembly, an acoustical transformer and an output horn assembly. The transducer assembly includes an inner driver cone, an outer driver cone and a dust cap constructed such that the direct path length from the voice coil to the outer driver cone periphery is substantially equal to the distance from the voice coil to the dust cap peak. Mechanical vibrations produced by the voice coil propagate to the outer driver cone periphery and to the dust cap peak in the same amount of time; thus the acoustical signals transmitted by the outer driver cone periphery and the dust cap peak are substantially time-coherent. The acoustical signal transmitted by the transducer assembly is directed toward the horn assembly by an acoustical transformer through plurality of radial waveguides.

Abstract: An acoustic annunciator which includes resonating cavity, a piezoelectric element, and a folded horn which are each selected to have a different resonance frequency so as to expand the frequency range of the output of the annunciator. The folded horn includes a cone defined by a main body portion and an outer horn which is rotatable and axially displaceable with respect to the main body portion. The outer horn is designed to rotate to prevent the annunciator from being snagged or caught by objects. The outer horn is designed to be axially displaceable in order to access and remove debris from inside the annunciator. In addition, the acoustic annunciator includes a driver that faces downward during use. This orientation of the driver allows for drainage while preventing the ingress of rain and/or snow.

Abstract: A phase plug for a horn loaded speaker has a frustro-conical body with a spherical entrance end and a planer outlet end. The plug is formed with radial channels. The entrance of the phase plug and the speaker diaphragm are conformal and the channels have generally equal aperture area from the entrance to the outlet, or slightly increasing aperture areas so as to minimize diffraction The truncation surface is defined by the intersection of the sidewalls of the conical body and the cone angle of the horn.

Abstract: A loudspeaker horn has straight wall section and a curved wall section. The straight wall section has diverging walls defining a coverage angle and the curved wall portion is connected to the straight wall portion at a point tangent thereto, and has a proximal end disposed perpendicular to the plane of the throat entrance. At least one coverage angle in orthogonal planes has a common apex in the plane of the throat entrance and along the horn axis.

Abstract: A loudspeaker includes a compresion chamber, a first electroacoustic transducer and a horn. The first electroacoustic transducer is disposed inside the compression chamber. The horn is mechanically and acoustically coupled to the first electroacoustic transducer. The loudspeaker also includes a second electroacoustic transducer. The second electroacoustic transducer is disposed outside the compression chamber. The second electroacoustic transducer is mechanically and acoustically coupled to the horn.

Abstract: A sound apparatus capable of obtaining a clear sound (audio image) irrespective of a position of a speaker portion to be provided in the sound apparatus. The sound apparatus includes a speaker portion and a plurality of sound guides each of which has one end portion connected to the speaker portion and has the other end portion opened; wherein lengths of the plurality of sound guides are nearly equal to each other and the other end portions of the sound guides are arranged such that sounds generated from the speaker portion are guided through the sound guides and collide with each other.

Abstract: The present invention is a waveguide device having a body of molded, foam plastic with a speaker end and an open end and an even number of segments with a flat surface in a plane parallel to the speaker end. The segments have inside wall surfaces which flare increasingly outwardly from the speaker, and these inside wall surfaces have a speaker end length, L.sub.1, determined by the following formulas, L.sub.1 minimum=0.7.times.w.sub.s /0.0012 g/cm.sup.3 .times.1/A.sub.SE, and L.sub.1 maximum=1.2.times.w.sub.s /0.0012 g/cm.sup.3 .times.1/A.sub.SE, wherein L.sub.1 is a straight line length of the lower portion of the segment wall surface, w.sub.s is the weight of a speaker cone in grams/cm.sup.3, and A.sub.SE is the cross-sectional area of the speaker end in square centimeters. The waveguide body also includes an end plate with a speaker face and anchor inserts for attachment of a speaker thereto. The anchoring inserts are embedded in the waveguide body.

Abstract: A loudspeaker system having a cross-cabinet horizontal array of loudspeakers for collectively generating a common acoustical wavefront when respective drivers associated with each of the loudspeakers of the array are similarly driven. The loudspeakers are secured to each other such that adjoining horn side walls for adjacent ones of the loudspeakers are substantially parallel to each other and are relatively deep in relationship to the total length of the loudspeakers, i.e., the length of the sidewalls is about 80% of the depth of the entire loudspeaker. Each horn is angled about 30 degrees off a central axis thereof to provide 30 degrees coverage in the horizontal plane and includes a first, essentially untapered, section which provides the aforementioned coverage in the horizontal plane and a second section having a taper of about 30% to prevent diffraction of the wavefront at the edges of the horn.

Abstract: A down-fill speaker for a large scale sound reproduction system is formed from a cabinet having generally rectangular and trapezoidal cross-sections along respective vertical and horizontal axes thereof. Upper and lower loudspeakers are supportably mounted in the cabinet in a generally vertical array and separated by a separator wall. The upper and lower loudspeakers each include a horn defined by walls of the cabinet. The upper horn is defined by interior side surfaces of top, first side and second side walls of the cabinet and a first interior side surface of the separator wall. The lower horn is defined by interior side surfaces of bottom, first side and second side walls of the cabinet and a second interior side surface of the separator wall. The separator wall is angled about 15 degrees below a horizontal axis for the speaker while the first and second interior side surfaces thereof have oppositely orientated tapers of generally equal magnitude.

Abstract: The present invention is a waveguide for an acoustic speaker having a predetermined cone weight. The waveguide body has a speaker end and an open end and an even number of segments with a flat surface in a plane parallel to the speaker end. The segments have inside wall surfaces which flare increasingly outwardly from the speaker, and these inside wall surfaces have a speaker end length, L.sub.1, determined by the following formulas, L.sub.1 minimum=0.7.times.w.sub.s /0.0012 g/cm.sup.3 .times.1/A.sub.SE, and L.sub.1 maximum=1.2.times.w.sub.s /0.0012 g/cm.sup.3 .times.1/A.sub.SE, wherein L.sub.1 is a straight line length of the lower portion of the segment wall surface, w.sub.s is the weight of a speaker cone in grams/cm.sup.3, and A.sub.SE is the cross-sectional area of the speaker end in square centimeters. Each of the segment inside wall surfaces has an outer end length L.sub.2 which has a predetermined length related to L.sub.1.

Abstract: A driver for use with a horn radiator includes a heat conductive hollow base that confines an upwardly opened cavity for receiving a yoke. The yoke has an outer wall surface that defines a first clearance with the base, and an inner wall surface which is formed with a through hole that extends to the outer wall surface. A permanent magnet is received in the yoke, and defines a second clearance with the inner wall surface of the yoke. A flux guiding plate is superimposed on the permanent magnet, and is disposed in the yoke to define a gap with the inner wall surface of the yoke. The second clearance is communicated fluidly with the first clearance via the through hole, and is in fluid communication with the gap. A diaphragm has a top portion disposed above the flux guiding plate, and an annular extension extending into the gap. A voice coil is connected to the annular extension of the diaphragm, and is disposed in the gap.

Abstract: An apparatus for generating a audible tone is disclosed. The apparatus includes a ferromagnetic container 105, a ferromagnetic pole 110, a coil 115, a first stationary lead wire 175, a second stationary lead wire 180, and a flexible ferromagnetic diaphragm 120. The ferromagnetic pole 110 is disposed within the ferromagnetic container 105. The coil 115 is encircling a portion of the ferromagnetic pole 110. The coil 115 has an input end 165 connected to a first stationary lead wire 175, configured to receive an electrical signal, and an output end 170 connected to a second stationary lead wire 180. The flexible ferromagnetic diaphragm 120 is disposed along the top edge 135 of the ferromagnetic container 105. The flexible ferromagnetic diaphragm 120 is configured to flex when magnetically attracted toward the ferromagnetic pole 110. As the flexible ferromagnetic diaphragm 120 flexes the first stationary lead wire 175 and the second stationary lead wire 180 will remain stationary.

Abstract: A loudspeaker system capable of minimizing interference of sound waves and increasing bass sound amplification efficiency by collecting and amplifying only a portion of the sound waves radiated from the rear of a loudspeaker. The loudspeaker system includes a supporting member having a partition formed therein, an amplifying horn for collecting and amplifying only a portion of the sound waves radiated from the rear of a loudspeaker, a discharge horn for discharging the amplified sound waves, and a guide plate for guiding the sound waves discharged from the loudspeaker and through the discharge horn.

Abstract: A speaker has a substantially reduced size, is efficient in the low sound range and is unidirectional relative to the plane of installation or support of the speaker. The speaker includes a vibrator having a semispherical vibrating body made of a piezoelectric material polarized in a thickness direction. Electrodes are provided on the inner and outer surfaces of the vibrating body. A cavity is created inside of the vibrator. A sound path in the form of a horn includes inner parts of a first cylinder which communicates with the cavity, a second cylinder, a third cylinder, a fourth cylinder, a fifth cylinder and other cylinders. Cutouts functioning as openings of the sound path are disposed almost along the whole azimuth of the fifth cylinder at the outside of the horn relative to the plane of speaker support.

Abstract: A loudspeaker has a yoke having a center hole, a cylindrical magnet mounted on the yoke, a cylindrical pole piece having an inner shoulder portion and mounted on the magnet. A diaphragm is provided above the pole piece, and a cylindrical throat is disposed in the magnet. The yoke has a screw thread formed on an inside wall of the center hole, and the pole piece has a screw thread formed on an inside wall of the shoulder portion. The throat has outer screw threads on an outside wall thereof at an upper portion and a low portion. The outer screw threads are engaged with the screw threads of the yoke and the pole piece. Thus, the magnet is secured to the yoke and the pole piece.

Abstract: Compression driver with a voice coil 3 which can move in an annular air gap 2 of a magnetic system 1 and with a diaphragm driven by the voice coil 3. The diaphragm 5 and compression chamber 12 are of annular design and compression chamber 12 is connected to a central sound output channel 14 around its perimeter. Owing to its annular design the diaphragm 5 has a large effective surface area and a small mass. The feed power is therefore relatively low, resonant frequency is high and therefore the fidelity of high frequencies is improved. This is particularly the case if the diaphragm is V-shaped, preferably curved towards the acute angle enclosed by it.

Abstract: A loudspeaker system having a multiple driver array arranged in a push-pull configuration is loaded into an acoustic transmission line ported to the outside of the loudspeaker enclosure. The transmission line is preferably tapered and is filled with acoustic damping material. The combination of the push-pull driver configuration loaded into an acoustic transmission line produces a high performance, spatially enhanced sound reproduction.