Abstract: A power efficient, acoustical Helmholtz resonator foghorn including a plurality of electrical emitters, some of which are redundant, arrayed at one end of a blocked tube with a plurality of exhaust ports located therein surrounded by a standoff tubular member. The foghorn tuned to provide a high pitch thus providing a compact horn having an acoustical path capable of producing an exceptional wavelength in a generally concentric horizontal sound propagation the horn configurable for use as either a one-half mile or two mile marine navigational aid for offshore structures, buoys, and the like.

Abstract: A port for a loudspeaker is disclosed which is sufficiently weather resistant for long term outdoor use and which prevents debris, insects and other vermin from entering the loudspeaker and which is compact and efficient.

Abstract: A speaker mounting structure is provided in which a speaker frame (11) is fixed to a mounting panel (P) by engaging latching hooks (24L, 24R) and a latching clip (26) provided on the speaker frame (11) with mounting holes (22, 23L, 23R) formed in the inner panel (P) of an automobile door. The latching hooks (24L, 24R) and the latching clip (26) are disposed inside the outer peripheral edges of annular seal members (16, 17) that are bonded to a mounting surface (11a) of the speaker frame (11) and are in intimate contact with the inner panel (P). As a result, even when water infiltrates to the speaker (C) side from an opening (21) or the mounting holes (22, 23L, 23R) of the inner panel (P), the seal members (16, 17) can block the water and prevent it from flowing to the passenger compartment side. It is thereby possible to reliably avoid ingress of water.

Abstract: A protective acoustic cover assembly including a metal foil with perforations, and a treatment on one or more surfaces of said metal foil. The treatment is a hydrophobic or oleophobic treatment, or both. The protective acoustic cover assembly has an average specific acoustic resistance of less than about 11 Rayls MKS from 250-300 Hz, an average specific acoustic reactance magnitude of less than about 1 Rayls MKS from 250-300 Hz, and an instantaneous water entry pressure value of greater than about 11 cm. The perforations of the metal foil preferably have an average maximum pore size of less than about 150 micrometers. The protective acoustic cover assembly further includes an adhesive mounting system, and the preferred metal foil is nickel.

Abstract: A damper-mounting wall portion 40 which is provided on a small-diameter end of a trumpet-shape part of a frame 1 so as to extend in a diametrically inward direction is formed with an outside diameter which is larger than a diameter of a damper 8 which is adhered thereto. On a peripheral edge portion of the damper-mounting wall portion 40, there is integrally formed an annular eave-shaped barrier wall portion 41 which extends in an axial direction toward the front side of the frame 1 so as to enclose the circumference of the damper 8 at a position away from the periphery of the damper 8.

Abstract: A speaker has a very small size and is arranged to emit sound waves in a non-directional manner. The speaker includes a case and a speaker unit attached to a plate provided at an opening of the case. The speaker is arranged so that the speaker unit is mounted or attached to a floor or support surface such that a space formed by the case, the plate and the speaker unit is airtight and so that the back-and-forth motion of a vibrator of the speaker unit generates expansion and contraction of the case.

Abstract: A mount for acoustic transducers has a resilient sheet with a plurality of mounting apertures therein. Each mounting aperture has an annular groove formed about the inside surface of the sheet to accommodate one of the acoustic transducers. A pair of rigid, acoustically transparent plates are mounted on each side of the resilient sheet. Each plate has a plurality of communication apertures in it which correspond to the mounting apertures of the resilient sheet. The acoustic transducers are inserted into the mounting aperture of the resilient sheet. The acoustically transparent plates provide structural support for the mount.

Abstract: The present invention relates to a LCD display that has a thin depth, rigid enclosure and includes a thin speaker so that the depth of the enclosure does not have to be increased to accommodate the speaker. The speaker is used to generate audio output that may correlate to the graphical information displayed on the LCD display. The enclosure has an opening for inclusion of a semi-rigid lens for viewing of an internal LCD module that is also used as a planar surface for the thin speaker. In order to provide a thin device in the enclosure that is driven by a driver to move air to generate sound, the driver is attached to the semi-rigid lens.

Abstract: A waveguide system for radiating sound waves. The system includes a low loss waveguide for transmitting sound waves, having walls are tapered so that said crosssectional area of the exit end is less than the cross-sectional area of the inlet end. In a second aspect of the invention, a waveguide for radiating sound waves, has segments of length approximately equal to A ⁡ ( y ) = A inlet ⁡ [ 1 - 2 ⁢ Y B + ( Y B ) 2 ] where l is the effective length of said waveguide and n is a positive integer.

Abstract: A water resistant audible toy, such as a toy water gun, includes a speaker having a water resistant speaker cone. The water resistant audible toy includes a switch to activate the speaker to generate sounds. The water resistant audible toy may further include a light to generate lighting effects and a motor to generate a vibration. A pressure equalizer may be further included in the water resistant audible toy. Seals may be provided as part of the water resistant audible toy. The toy water gun includes a trigger to actuate the switch. The speaker may be part of a water resistant sound effects module.

Abstract: The present invention relates to a LCD display that has a thin depth, rigid enclosure and includes a thin speaker so that the depth of the enclosure does not have to be increased to accommodate the speaker. The speaker is used to generate audio output that may correlate to the graphical information displayed on the LCD display. The enclosure has an opening for inclusion of a semi-rigid lens for viewing of an internal LCD module that is also used as a planar surface for the thin speaker. In order to provide a thin device in the enclosure that is driven by a driver to move air to generate sound, the driver is attached to the semi-rigid lens.

Abstract: A waterproof speaker has a yoke provided with a magnet and a center pole therein. A top plate is attached on the periphery of the yoke, wherein the center pole protrudes through a center opening of the top plate. A frame is mounted on a front surface of the top plate. A cone-shaped diaphragm has a middle through-hole that mounts a bobbin and is enclosed by a cap, wherein the diaphragm has its rim portion attached to a forward end portion of the frame via an edge portion. A voice coil is mounted around the periphery of the bobbin. A waterproof damper is supported by the frame and defined with a hole through which the bobbin is protruded, and the damper is formed of two layers, wherein a first layer is cloth material, and a second layer is waterproof material to prevent moisture entering the yoke.

Abstract: An improved mounting structure for mounting a speaker onto a cabinet comprising: a base seat with a sound output hole on its surface, and with an annular inner partitioning wall therein having spaced inner protruding engaging flanges at the rim at the opening of the base seat; a speaker having a mounting ring on a frame thereof for assembling with the base seat, the ring has spaced outer protruding engaging flanges thereon; and a foam body provided on the inner wall of the frame of the speaker, the foam body is abutted against the inner partitioning wall of the base seat in an airtight mode; the base seat can be embedded in various cabinets of different modeling, the outer protruding engaging flanges on the frame of the speaker are rotated to engage with the inner protruding engaging flanges, the inner partitioning wall of the base seat abuts tightly against the foam body.

Abstract: An improved structure of speaker cabinet comprising a housing opened on one side thereof, and comprising a front panel, wherein, a plurality of intermediate speakers can be held firm and get increased connecting strength when the front panel is integrally connected with the housing to thereby offset the frontward and rearward thrusts of the speakers. Moreover, a plurality of hollow posts located at the positions in correspondence with those of the connecting areas of the speakers to the cabinet can be filled therein with vibration absorbing material in order to reduce vibration at the earliest time. Such a design not only can reduce volume and weight of the cabinet, but also can improve sound quality and provide a hidden port to improve beauty and waterproofing effect of the cabinet.

Abstract: A framework for home theater system speakers includes a ceiling mount assembly having ceiling mounts fastenable to the ceiling, connectors detachably connected to the ceiling mounts, and cables extending downwardly from the connectors. Sub-frame members are interconnected to create a frame, which is connected to the cable so as to be suspended from the ceiling. The frame is hollow and houses speaker wiring. Speakers are supported at positions substantially surrounding a viewing or listening area to provide a surround sound effect.

Abstract: An electro-acoustic transducer in which a plurality of cymbal-type electro-acoustic actuators are disposed in mechanical and electrical parallel between a pair of stiff plates. The resultant transducer resonates at a lower frequency than the cymbals, with a greater generated force.

Abstract: A speaker has a very small size and is arranged to emit sound waves in a non-directional manner. The speaker includes a case and a speaker unit attached to a plate provided at an opening of the case. The speaker is arranged so that the speaker unit is mounted or attached to a floor or support surface such that a space formed by the case, the plate and the speaker unit is airtight and so that the back-and-forth motion of a vibrator of the speaker unit generates expansion and contraction of the case.

Abstract: A water gun includes a sound effects module. The water gun includes a trigger to squirt water. The trigger actuates a switch coupled to the sound effects module. The sound effects module has an interior volume with a speaker at one end. A speaker cover seals the periphery of the speaker. The sound effects module also has a sealed compartment containing a keypad to control the sound effects module and a printed circuit board.

Abstract: The present invention concerns a watertight apparatus capable of being immersed in a liquid, for example a watertight watch, including a case (1) with an inner chamber (10) communicating with the exterior, the chamber being separated from the exterior by a membrane (17) which can be deformed, defining, on one side, a non-watertight outer zone and, on the other side, a watertight inner zone, in which is housed, in association with the membrane, an acoustic transducer (22), the membrane being fixed by its peripheral edge (17A) in the chamber (10) and applied via elastic memeber (20) towards its periphery, but at a distance from the edge, against a support surface (12) arranged in the inner chamber (10).

Abstract: To provide a bass-reflex speaker assembly having superior water resistance and which can be mounted on a motorcycle, while not being subjected to the influence of negative pressure due to wind during travel and which is capable of maintaining superior sound quality. A resonant duct projects downwards at an incline at a bottom surface of a speaker enclosure. It is therefore difficult for rain water to enter because the duct opens downwards and water that may enter temporarily can be easily discharged from the same duct. Furthermore, when speakers are positioned within the cowling of the motorcycle, negative pressure occurring due to wind when the vehicle is travelling acts not only on the front surfaces of paper cones of the speakers, but also on the rear surfaces via the ducts. Therefore, superior sound quality can be maintained without the influence of negative pressure being incurred and a bass-reflex speaker assembly suited to motorcycles is therefore possible.

Abstract: In order to reduce the possibility of moisture, which has seeped into a door from its lower side, contacting with a speaker and also of air pressure building up behind the speaker and hindering the movement of the diaphragm, a waterproof cover 3 is provided which includes a magnet cover 31 which follows the circumference of a magnet 16, a frame cover 32 which partially overlaps with the magnet cover 31 and follows the circumference of the frame 15 when it is combined with a speaker 2, a first aperture 33 placed between the magnet 16 and the magnet cover 31 and a second aperture 34 placed between the magnet cover 31 and the frame cover 32.

Abstract: The speaker hatchboard (26) allows audio speakers (34 and 36) to be installed in a sailboat (10) or other vessel without drilling holes through any boat surfaces. The speaker hatchboard (26) includes a body (28) dimensioned to be received within the slots (48) of a hatchway (22) or other boat opening, a pair of openings (30 and 32) for mounting the speakers (34 and 36) and housings (38 and 40) for the speakers (34 and 36). The speaker hatchboard is easily installed and removed by sliding the body (28) up or down within the slots (48).

Abstract: Outside an electrical equipment housing having a speaker installed therein is installed a vibratory plate member for externally transmitting vibrations of the speaker as a sound and for preventing intrusion of water from outside the housing, and a plurality of sound release holes are formed through the housing, inside the vibratory plate member, for transmitting a sound from the speaker to the vibratory plate member.

Abstract: An omnidirectional speaker system includes woofer and tweeter speakers mounted in a concave, curved upper fabricated of a relatively hard shell exterior and a foam interior, preferably plastic. Beneath the upper housing is a base, including a generally conical phase compensation plug which disperses the sound waves equally in all directions through a circumferential aperture between the upper housing and base. In a preferred embodiment, the cross-sectional shape of the upper housing is parabolic and the cross-sectional shape of the phase compensation plug is hyperbolic.

Abstract: An acoustic source apparatus has a loudspeaker enclosed within a substantly pressure resistant and water tight enclosure. Acoustic energy from the loudspeaker emanates through an opening in the enclosure. This opening is covered by a resilient diaphragm that transmits the acoustic energy to an aqueous medium. A net constrains the diaphragm to a preselected size and shape. The net further impedes overexpansion of the diaphragm and restrains the diaphragm from migrating due to buoyancy. Additonally, the net stiffens and strengthens the diaphragm, to thereby increase the resonant frequency, impedance and quality factor of the transducer system and decrease the transmission bandwidth of the system. Constraining the transducer diaphragm with the net makes higher transducer source levels possible.

Abstract: A headset is provided which includes an inverted cup-shaped housing. The housing contains a rigid membrane which separates the housing into an upper chamber and a lower chamber. An inertial transducer is positioned in the upper chamber secured to the membrane. Electrical leads extend into the transducer through water tight connections. A headband is provided to secure the headset to a listener's ear and a cushion is provided about the open bottom end of the headset housing. Only the transducer itself is water tight. Both the upper and lower chambers of the housing freely permit the passage of water.

Abstract: A waterproof ground audio speaker apparatus has a speaker housing having a cylindrical sidewall, one open end and a closed end. A hollow cylindrical inner housing has a pair of open ends and is attached to the speaker housing with its walls in a spaced relationship to the walls of the speaker housing to form a passageway between the walls of the inner housing and the walls of the speaker housing. A loud speaker is mounted in the hollow inner housing facing one open end thereof for directing acoustical energy out the open end of the speaker housing and directing the backwave of the speaker through the hollow inner housing and through the passageway between the inner housing and the speaker housing to the open end of the speaker housing. A rigid domed supporting cover extends over the opening of the speaker housing and a filter membrane cover covers the open end of the speaker housing to protect the inside of the speaker enclosure.

Abstract: A hermetically sealed speaker enclosure assembled from pieces that can be shipped economically in compact knocked-down condition. The mating surfaces at the edges and margins of the assembled pieces are hermetically sealed by gaskets clamped therebetween. Some of the gaskets can be in the form of bands of compressible elastic material stretched around the peripheral edges of certain pieces or panels and seated in connecting grooves in the peripheral edges. Other of the gaskets are in the form of individual lengths of compressible material seated in certain of the borders or marginal edges. Appropriate fasteners are used to secure the pieces together in hermetically sealed relationship. Assembly of the speaker enclosure can be economically made at the place of installation of the speaker components.

Abstract: A simulated rock speaker cabinet in the form of a natural rock has build-up portions of modeling clay which include a pattern of small diameter holes to form speaker grills at longitudinally spaced positions. A chicken wire ring provides structural reinforcement to the speaker cabinet. The artificial rock cabinet may be molded of various hydrolitic cements, magnesite cement, a suitable catalytic plastic resin to which pigment or other colorants may be added along with glass or rock chips, to provide the simulated rock cabinet with an external appearance which corresponds to various natural rocks. The speaker cabinet has speakers and the various electronic components of the speaker system housed within the speaker cabinet and may be coated with water-proofing and weather-proofing material with the speakers molded into the wells and facing the grills. An end plug may be adhesively sealed to the opening within the base of the speaker cabinet and suitably sealed by Hydrostone or other cementous material.

Abstract: A pressure modifying device and method which utilizes a gas or vapor and an adsorbent material to reduce the amplitude of pressure variations in gas or vapor. The technique is applicable to loudspeaker assemblies having a box (2), low frequency loudspeaker (16) and a mass (20) of activated charcoal in the box. Excursions of the cone (18) of the loudspeaker in the range 20 to 100 Hz cause pressure fluctuations in the air in the box but the size of those pressure fluctuations is comparatively small owing to increased air adsorption on the activated charcoal leading to increased efficiency.

Abstract: An earphone having a housing, a speaker unit accommodated in the housing and a duct formed in the housing to pass sound emanated from the rear surface of the speaker unit and in which a mesh subjected to water repellent treatment is provided within the duct.

Abstract: A waterproof enclosure for a portable radio, tape recorder/player, or the like includes a flexible membrane with a finger control pocket adjacent the control knobs of the radio, an opening for inserting and removing the radio from the enclosure with a waterproof sealed cover to close the opening, and a waterproof seal around the earphone plug connector that extends through the flexible membrane. A waterproof earphone speaker is also provided, which has a conical waterproof boot fitted snugly over the speaker. Annular collars on the conical boot anchor the speaker in a person's ear and seal water out of the ear and conical boot.

Abstract: The present invention is a stereo headset system for use with a stereo headset device and a stereo sound system. The stereo headset device is of the stethoscope type and has a pair of sound tubular mains. A coupling plug is mechanically and acoustically coupled to the pair of sound tubular mains. The stereo headset system includes an enclosure having a first chamber, a second chamber, a third chamber and a fourth chamber. The first and second chambers are mechanically and acoustically coupled to the coupling plug of the stereo headset device. A first electro-acoustic transducer is disposed in the third chamber of the enclosure and is acoustically coupled to the first chamber of the enclosure. A second electro-acoustic transducer is disposed in the fourth chamber of the enclosure and is acoustically coupled to the second chamber of the enclosure. The third and fourth chambers of the enclosure are water-proofed.

Abstract: A reflex horn speaker with a waterproofing device for use on a ship or the like is disclosed. The reflex horn speaker comprising a sound generator, an inner cylindrical horn, a conical reflector concentrically arranged around the inner horn, and an outer cylindrical horn concentrically arranged around the reflector, is provided with a waterproofing device such as a valve, mounted to the closed front end of the reflector, which can open or close the front opening of the inner horn in order to prevent water and/or moisture from coming in the inner horn when it is not used.

Abstract: The speaker grill is a part of a molded plastic member which may form a wall of housing for a device which includes an audio transducer. The plastic member includes provisions for supporting the audio transducer adjacent the grill, which has openings for the transmission of sound. The grill has stress regions in which there are no openings, which are in tension when the grill is flexed to thereby increase the strength of the grill. The stress regions may extend across the grill in an "X" pattern, or in any other pattern wherein one of a plurality of such regions extends transversely with respect to another region. The openings for sound transmission may be slots extending from the sides of grooves, which form labyrinth openings so that there is no direct passage through the grill, thereby tending to prevent entry of undesired objects.

Abstract: In a loudspeaker system having eight drivers on a baffle, the baffle has two port openings centered in respective squares embracing respective groups of four drivers. A tubular column extender snaps into each port opening and has a snap cap for detachably securing a polyester disk over the opening. A grill formed with two openings for accomodating the column extenders covers the drivers. A grill retainer formed with openings at each end for accomodating the column extenders abuts the grill, and clinch nuts screws on the threaded end of ach column extender to keep the grill retainer against the grill with the grill against the front baffle.

Abstract: The loudspeaker is mounted within a hollow, essentially tubular body so that the loudspeaker structure extends into the tubular body. The tubular body is at least in part insertable into an opening of a vehicle panel, such as a dashboard, rear window shelf, or the like. The rear of the panel is closed off by a housing body, shaped to leave a space or chamber behind the tubular body; preferably, the housing body is made of a foam material, or includes, at the inside, a foam rubber material which may be of open pore structure at least in the region facing the tubular body.

Abstract: A moisture protective housing for a sound transducer located inside the face mask of a diver which face mask is vented to a breathing apparatus, such as a scuba tank with regulator, to maintain the air breathed by the diver at substantially the same pressure as the water surrounding the diver. The housing includes a deformable portion having pin prick perforations or pores therethrough to make that portion porous when formed. The number of perforations or pores, as well as their size, are selected such that the porous portion becomes permeable to air and/or water only if the pressure differential across it exceeds a preselected value.

Abstract: A weatherproof loudspeaker assembly includes a box-like one-piece open-front plastic housing and a corrugated fiberboard member folded so as to line the inside of the housing with two crossed layers of corrugations on each of the walls surrounding the open front. A plastic grille plate has a plurality of slots therethrough separating forwardly projecting vanes, and a loudspeaker has a water-repellent front portion including a peripheral mounting and sealing flange mounted in watertight sealing engagement with the rear of the grille plate in surrounding relationship with the slots by means of plastic posts extending from the grille plate through holes in the loudspeaker flange and melted in place to form a rivet-like fastening.

Abstract: A water-proof sound apparatus comprising a sealed cabinet, filter means attached to said cabinet which is permeable to gases and impermeable to liquids, a speaker attached to said cabinet which has a water-proof construction, and a grill covering the front of said speaker. The above sound apparatus when used can be floated in water, and it can be washed with city water and the like. The relationship between the outside atmospheric pressure and the pressure in the cabinet can be adjusted in accordance with the changes in the atmospheric temperature, the atmospheric pressure, and the temperature in the cabinet, so that an excellent sound effect can be attained at all times.

Abstract: A speaker system for a small radio device includes a cover plate having slots therein and a rigid grille screen having channels which extend into the slots. The cover plate and grille screen are generally planar and parallel to each other, and the channels in the screen have portions generally perpendicular to the plate and screen which are spaced from the edges of the slots, with openings therein through which sound is transmitted. A felt disc is positioned over the screen, and the speaker is positioned against the felt disc. An annular bracket engages the speaker rim and is secured to the cover plate to hold the speaker system assembled. The bracket is of semi-circular cross-section with the flat side thereof engaging the speaker, and has integral extensions which are secured to the cover plate to clamp the speaker against the felt disc.