Abstract: A loudspeaker system, which has the ability to create a homogeneous sound over large distances, comprising at least one line-source of acoustical radiation, each comprising three or more essentially identical speaker-units arranged adjacent to each other at a center-to-center spacing D1, and at least one elongated high frequency transducer arranged in parallel with said line source(s), said elongated high frequency transducer(s) having an essentially continuous radiating surface along the axis of elongation. Where the crossover frequency FCR and the distance D1, for said line-source(s), is set according to new design criteria, taking into account the frequency response from said speaker units in said line-sources and the optimal performance for a line-source. A method is also included, by which a homogeneous sound over large distances can be accomplished.

Abstract: A speaker includes a housing having a diffusion opening provided with a laser vibration diaphragm. The laser vibration diaphragm has reflective spatial patterns, so that the speaker may present multiple-image variations under different rays of light, thereby enhancing a viewing effect and aesthetic quality of the speaker. Thus, the laser vibration diaphragm may produce spatial variations by the difference of incident angles of the light, thereby obtaining a viewable strong sensation to the people, and thereby enhancing the viewing effect and aesthetic quality of the speaker.

Abstract: In a speaker device including a plurality of speakers outputting different frequency bands, for a listener listening to sound from the speaker device, a first emitting direction of a first speaker emitting a high frequency band is oriented toward the listener more than a second emitting direction of a second speaker emitting a low frequency band.

Abstract: An electroacoustic transducer which has at least one stator member with an operating surface and a suspended emitter diaphragm spaced from the operating surface of the stator member to enable the diaphragm to oscillate in response to an applied signal voltage. The diaphragm has increased stiffness in a direction along the diaphragm and within the emitter section to enable the emitter diaphragm to oscillate without applying tension in the direction of stiffness. A clamp member secures the diaphragm to maintain the diaphragm in a fixed position relative to the stator to minimize distortion. The clamp member is positioned to define at least two isolated emitter sections for enhancing the frequency response of the transducer. A method is also provided for generating audio output from an electroacoustic transducer.

Abstract: A compound driver acoustic transducer. A frame supports a motion generator to one side of two diaphragms. An intermediate diaphragm is continuous and is driven by the motion generator. The intermediate diaphragm forms a closed volume with a solid portion of the frame that opens into a central opening through the other, open diaphragm. An axially rigid coupling connects the two diaphragms so they operate in unison.

Abstract: The present invention relates to an improved speaker which includes at least one radiating surface configured to vibrate to produce sound waves, and an existing speaker cone configured to vibrate to produce sound waves, wherein said at least one radiating surface is adapted to fit over or onto the existing speaker cone, the said at least one radiating surface having a direct or indirect airtight attachment to the existing speaker cone to provide a hermetically sealed cavity between the existing speaker cone and said at least one radiating surface.

Abstract: A loudspeaker (81) comprises an enclosure, an acoustic radiator (2) in the enclosure, a compliant suspension (3) mounting the radiator in the enclosure for pistonic movement relative thereto, and a first transducer (9) for driving the radiator pistonically. The radiator is also excited by a bending wave transducer mounted on the radiator which vibrates the radiator to cause it to resonate. The first transducer varies the air pressure in the enclosure to cause the radiator to move pistonically.

Abstract: A loudspeaker has a frame, a magnetic circuit formed on the frame, a voice coil bobbin disposed in a magnetic gap of the magnetic circuit, and a diaphragm connected to the voice coil bobbin at an inner periphery and to the frame at an outer periphery thereof. The diaphragm is folded at a position between the inner and outer peripheries to form an annular ridge. The ridge is projected in an axially inner direction of the loudspeaker.

Abstract: In an electrostatic capacitance type transducer which has a substrate, a movable electrode confrontingly placed to the substrate in a movable manner through a space, a fixed electrode arranged on a detecting face confronting the movable electrode of the substrate, and a signal receiving portion which is conductive with the fixed electrode and derived from the detecting face of the substrate, the fixed electrode and the signal receiving portion are made of metals which are different with each other in their compositions. That is, the fixed electrode is made of metal which has a high corrosion resistance and is not likely to outbreak a hillock, and the signal receiving portion is made of metal which is easy for bonding. Alternatively, both the fixed electrode and the signal receiving portion are made of titanium.

Abstract: A speaker base, which includes a tweeter holder having a holder base and a bottom mounting holder rod, and withholding ring mounted on the tweeter holder to hold a tweeter, wherein the tweeter holder has an axial center through hole through its holder base and bottom mounting holder rod through which the lead wires of the tweeter pass.

Abstract: The invention relates to an improved piezoelectric loudspeaker for high frequency, more commonly known as a tweeter. The invention embraces a technological improvement which permits the size of the tweeter to be substantially reduced while maintaining or even improving its performance when compared to other tweeters. In the device, a diaphragm is placed at least partially inside a coil so that the size of the tweeter can be reduced. The coil activates a piezoelectric element which drives the diaphragm causing it to vibrate and produce sound.

Abstract: A diaphragm formed of a material for molding mainly composed of a uniform mixture of an ultra-high molecular weight polyolefin with a high melting viscosity and a polyolefin with a lower melting viscosity, wherein the ultra-high molecular weight polyolefin is extensively oriented by the lubricating action of polyolefin having the lower melting viscosity and the method for producing the diaphragm. The diaphragm superior in specific modulus of elasticity and internal losses may be produced by producing the polyolefin composition by multi-stage polymerization and injection molding the composition for radially orienting the molecular chains of the ultra-high molecular weight polyolefin.

Abstract: A sound dispersing system using two or more vertically facing drivers in substantially coaxial alignment on a vertical axis. The drivers face conic reflectors which reflect sound radially over 360 degrees with substantial dispersion in vertical planes that include the vertical axis. Mounting means for drivers and reflectors are spaced vertically apart so that the vertical separation of the effective acoustic centers does not exceed industry standards for coherent sound above and below the horizontal plane equidistant between two drivers assigned adjacent bands of sound frequencies.

Abstract: This invention provides an acoustic material having high elastic modulus and large internal loss by subjecting a high-modulus stretched polyethylene containing paraffin wax to plasma treatment. When the acoustic material of the present invention is used for a diaphragm of a speaker, for example, it is possible to suppress the fluctuation of frequency characteristics resulting from split vibration, decrease harmonic distortion and improve transient characteristics.

Abstract: An improved dipole type characteristic loudspeaker system has a pair of loudspeakers (1 and 2) which are mounted on the front baffle board (4) and the back baffle board (5) of a console (3) and are connected to be driven in each-other opposite phase relation and have substantially the same acoustic characteristics in the medium and high frequency range but different acoustic characteristic in low frequency range; such loudspeaker system produces good surround-sound effect when used as back loudspeakers only with small number.

Abstract: An enclosure (10) for mounting two transducers (12, 14) includes a wall (20, 22) defining an enclosure (10) interior. The enclosure (10) also includes a wall (54 and/or 56) for dividing the enclosure (10) interior into a first portion (16) and a second portion (18). The enclosure (10) wall (20 and/or 22) includes a vent (52) for venting one of the first (16) and second (18) portions outside the enclosure (10), and a vent (74) for venting the other of the first (16) and second (18) portions outside the enclosure (10). The enclosure (10) further comprises a step (38) for mounting a transducer (12) perimetral edge. The step (38) extends inwardly from the enclosure (10) wall (20 and/or 22) into the enclosure (10) interior. The vent (52) for venting one of the first (16) and second ( 18) enclosure portions is provided between the step (38) and the back of the enclosure (10).

Abstract: A loudspeaker transducer has a coil (5) and a metal dome (11) with a skirt (13) arranged concentrically in a magnetic gap between pol pieces (2 and 4). The skirt (13) is inductively coupled to the coil (5) but is mechanically independent of the coil former tube (6). The tube (6) is connected to a main low frequency cone (9) and to a short concentric additional cone (16). A fixed element (14) providing phase correction and/or horn loading is fixed to the center pole piece (4) in front of the dome (11) and within the tube (6). The member (14) and tube (6) co-operate acoustically.

Abstract: An open line source speaker system includes a first columnar cabinet enclosing a plurality of midrange or woofer speakers arranged in the cabinet in a vertical line and a second columnar cabinet enclosing a plurality of tweeters arranged in the cabinet in a vertical line, with the first and second cabinets being spaced a predetermined distance from each other by a pair of spacing elements and the base portion of the speaker system supporting the first and second cabinets. The vertical height of the speakers will be such as to offer a large listening window of approximately floor height to well above the listener's head. All frequencies of the music originate from the same plane as positioned from the listener thus maintaining correct time/phase relationship and correct stereo image in both the horizontal and vertical planes regardless of musical frequency.

Abstract: A speaker which is thin but which is capable of providing high-fidelity reproduction and ensuring a suitable level of sound pressure even when it is brought close to a wall. A closed chamber is formed behind one part of a diaphragm mounted in an enclosure, and an open chamber is formed behind another part of the diaphragm. At least one voice coil drive unit is connected to the diaphragm. The phase difference between sounds radiated from the front and rear surfaces of the diaphragm is increased as large as possible by using an acoustic duct for the sound radiated through the open chamber, thereby minimizing cancellation of sounds and improving the sound pressure level.

Abstract: An electrodynamic transducer (1) comprises a diaphragm with a central part (2) and a peripheral part (3) and a voice-coil device (9, 10) coupled to the central part (2). The diaphragm (2, 3) cooperates with an enclosed volume (6), the enclosed volume being such that ##EQU1## where f.sub.o and f.sub.o ' are the anti-resonance frequencies of a transducer respectively with or without the enclosed volume behind the diaphragm. These frequencies each correspond to a local minimum situated between two maxima (f.sub.1 and f.sub.1 ' respectively, and f.sub.2 and f.sub.2 ' respectively) in the input impedance curves Z.sub.1 in the case of a transducer with the enclosed volume and in the case of a transducer without the enclosed volume. The maxima correspond to the two resonance frequencies for which the central part of the peripheral part move in phase and in phase opposition relative to one another, and S.sub.1 and S.sub.2 are the surface areas of the central part and the peripheral part, respectively, where S.sub.

Abstract: The invention relates to a wide-band loudspeaker in which the overall diaphragm is divided into an inner and an outer diaphragm sub-area. The inner diaphragm sub-area preferably consists of a dome-shaped cover of the moving-coil support. The outer diaphragm sub-area can be formed as a cone or NAWI diaphragm or as a shaped or moulded body, the shaped body having an at least approximately planar front face and its rear boundary face having the form of a cone or NAWI diaphragm. The outer diaphragm sub-area is connected to the moving-coil support by a frequency-dependent yieldable connection with high damping which at high audiofrequencies practically decouples the outer diaphragm sub-area from the moving-coil support but at low audiofrequencies acts like a rigid connection.

Abstract: The disklike diaphragm is made up of an essentially conical plastic film provided with vacuum-formed supporting members which extend up to the disklike radiating layer.

Abstract: A diaphragm for an acoustical transducer comprises a support and a separate cover for the support. The support is constructed from a relatively more rigid material having the desired physical characteristics of mass and stiffness for the transducer. The cover comprises a light weight, relatively less rigid, and pliable sheet of material. The cover is attached to the support, illustratively by an adhesive, to form the diaphragm.

Abstract: A speaker system and assembly achieves a high fidelity sound reproduction by causing acoustical waves emanating from juxtaposed and co-axially positioned first and second speakers, which produce respective mid-range and treble frequencies, to reach a listener simultaneously.

Abstract: A boom mounted microphone includes a boom mounted plug and connectors for connection to and supporting a microphone disposed in a two part housing that is divided into a socket for receiving said plug for locking physical support as well as conductive electrical connection, and a plurality of consecutive, adjacently disposed compartments, including at least a pair disposed parallel to the longitudinal axis, opening into the socket and containing conductive sockets for conductively receiving the connectors on the plug, a compartment for receiving a signal processing board and a compartment for mounting a microphone, the side walls, socket and compartments formed by complementary disposed walls of each housing and includes screw threaded fastening means extending through one wall of one part of the housing into the conductive sockets and in engagement with the connectors on the plug.

Abstract: A coaxial loudspeaker system is described wherein the high frequency horn which lies within the lower frequency speaker or cone, is constructed to avoid the "shadow effect" wherein there is a large drop in the magnitude of the response of the low frequency speaker over a narrow frequency bandwidth due to diffraction effects caused by the presence of the horn. The horn is formed with a group of slots near its wide end, to provide an opening for the passage of lower frequency sounds into the axial region of the cone which would otherwise be blocked by the horn.