Abstract: An integral micro-speaker having bi-directional dual magnetic field loops is provided. In general, the integral micro-speaker is incorporated into a wireless communication device such as a wireless telephone or a mobile telephone. The integral micro-speaker serves as a receiver and a speaker in a wireless telephone. The integral micro-speaker may further incorporate a vibrator for producing an added vibration function to the wireless telephone. In other words, a receiver, a speaker and a vibrator may be combined together to form an integral component inside the wireless telephone.

Abstract: A speaker apparatus, in which sound wave is uniformly radiated to front and rear sides thereof, to prevent distortion of sound due to one way vibration. The speaker apparatus includes a bobbin to vibrate a vibrating plate according to a current applied to a voice coil, and a yoke is disposed at an inner side of the bobbin and spaced apart from the bobbin by a predetermined interval. A sound wave guiding member is disposed at an inner side of the yoke so as to guide the sound wave to the front side and the rear side of the speaker apparatus.

Abstract: A mechanical device is tuned using a tunable damping rod. The tunable damping rod can have its tension increased between its respective engines, to in order to increase the resonant frequency of the mechanical device. Different aspects may also be included; the mechanical device may include a constrained layer damping material, which constraints certain mechanical vibrations. The tuning may tuned the mechanical device to reach that vibration.

Abstract: Packaging comprises a loudspeaker which has a board component that forms a part of the packaging and acts as a distributed mode bending wave acoustic radiator. A transducer is mounted wholly and exclusively on the radiator to vibrate it and cause it to resonate.

Abstract: A loudspeaker/visual display combination comprises a visual display module and a transducer attached to the display module to apply bending wave energy thereto to cause the display module to radiate an acoustic output. Attachment of a transducer directly to the visual display module dispenses with the need for a separate bending wave speaker whilst application of bending wave energy to the module allows satisfactory acoustic performance to be obtained.

Abstract: A loudspeaker includes a cabinet designed so as to define a central compartment sandwiched between upper and lower compartments. The cabinet is symmetrical about a vertical central, fore-and-aft extending plane. Located in each of the upper and lower compartments are a pair of vertical horn walls which are exponentially curved and diverge forwardly from an inlet located at a rear part of the respective compartments, to the front of opposite side walls of the cabinet. These horn walls define bass horns which have drivers coupled to their inlets. Located in the middle compartment and diverging at an angle of 15° from each other are a pair of mid/high frequency horns that are each formed by a pair of vertical horn walls that are exponentially curved and diverge forwardly from respective inlets located in a rear part of the middle compartment on opposite sides of the plane.

Abstract: A sound field equalizing apparatus for a speaker system which is capable of widening a region in which it is possible to effectively hear a sound field. The apparatus includes a sound field equalizing member disposed in a dispersing hole formed in a cabinet of a speaker for separating a sound dispersed from the speaker into a forwardly dispersed sound which is dispersed in a central direction and a laterally dispersing sound which is dispersed in a peripheral direction of the forwardly dispersing sound.

Abstract: There is provided an electroacoustic transducer 1 comprising a base 24 made of magnetic material, a magnetic core 22 made of magnetic material and provided erectly on the base 24, a diaphragm 20 made of magnetic material and supported with a gap between the diaphragm and a forward end of the magnetic core, a magnet 25 constituting a magnetic circuit together with the base 24, the magnetic core 22 and the diaphragm 20 so as to provide a magnetostatic field, a coil 23 disposed around the magnetic core for applying an oscillating magnetic field to the magnetic circuit, a coil bobbin 30 for holding the coil 23, a housing 10 for receiving the above-mentioned members, a filler 19 applied to an external surface side of the base 24, and lead terminals 41 and 42 for supplying an electric current. The lead terminals 41 and 42 have protrusion portions 41a and 42a, respectively, protruding into an internal surface side of the base 24 in the axial direction of the coil.

Abstract: A loudspeaker system of improved clarity, coherence and uniformity of energy distribution containing mid frequency sound chambers with an annular input and approximately rectangular output for use in multi-way co-axial horn loaded line array systems. The sound chambers propagate the annular mid frequency sound wave co-axially with a high frequency sound wave, gradually changing the cross section of the mid frequency wavefront resulting in co-linear acoustic mid and high frequency wavefronts from multiple devices which range from the shape of a flat ribbon to that of a curved ribbon. The sound chambers may be arrayed contiguously and placed at the entrance of a suitable waveguide to form a wide band width acoustic line source of extended length and controlled beamwidth.

Abstract: A microphone construction for use in a hearing aid includes a housing with first and second acoustic passages in communication with a microphone retaining chamber and acoustic openings in an exterior surface. A microphone, disposed within the microphone retaining chamber, has a first acoustic port in an acoustic relationship with the first acoustic passage and a second acoustic port in an acoustic relationship with the second acoustic passage. A first and second set of electrical leads are disposed within the housing. A switching mechanism secured to the housing and is positionable between a first position and a second position. In the first position, the first and second acoustic passages are in an acoustic receptive state and a first electric circuit is completed by connecting the first set of leads with a first connecting element disposed within the switching mechanism while breaking a second circuit.

Abstract: Acoustic device including a member extending transversely of its thickness and capable of sustaining bending waves at least over an intendedly consequentially acoustically active area of the transverse extent of said member, the member having, by reason of orderly design methodology disclosed and claimed, a distribution of resonant modes of its natural bending wave vibration at least over said area that is dependent on values of particular parameters of said members, including geometrical configuration and directional bending stiffness(es), which values have been selected to predetermine said distribution of natural resonant modes being consonant with required achievable acoustic action of said member for operation of said device over a desired operative acoustic frequency range.

Abstract: A special Hi-Fi tweeter having a ring-shaped dome portion with a retracted central portion fixed to the tweeter chassis was found to present an objectionable drop of response in the 18-20 KHz range. According to the invention this problem is eliminated or minimized in placing in front of said central area a forwardly projecting, generally conical wave guide (18) that will minimize interferences between sound waves radiated forwardly and inwardly from the ring shaped dome. An alternative solution is to arrange, in front of a wider central portion, a shield member directly preventing external radiation from the critical central area, still without changing the shape of the diaphragm. However, also certain modifications are proposed, which may well be used in connection with ordinary dome speakers.

Abstract: A bending wave panel-form loudspeaker comprises a spaced pair of panels supported at their edges and defining between them a shallow sealed fluid cavity. Vibration exciters are disposed in the fluid cavity and are arranged to drive the respective panels. The electrical connections to the exciters are at least partially in antiphase such that the predominant motion of the panels is in phase to provide a degree of dipole radiation property for the loudspeaker. The gap between the panels is in the range 2 to 25 mm such that the shallow cavity provides conditions in which fluid coupling dynamics and behavior is asserted between the pair of panels due to the fluid layer between them.

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: A speaker apparatus comprises an enclosure including a front panel and having a sealed compartment and a ported compartment. A first driver is mounted in the front panel and within the sealed compartment. An internal passive radiator is mounted in the enclosure. A radial port is formed in the enclosure front panel and is disposed at a position facing the internal passive radiator. The speaker apparatus also includes a second driver mounted in the front panel and within the sealed compartment. The internal passive radiator is mounted between the first and the second drivers.

Abstract: An acoustic waveguide loudspeaker system has an electroacoustical transducer having a vibratile surface. An acoustic waveguide has a first end open and a second end adjacent to the vibratile surface and an effective length corresponding substantially to a quarter wavelength at the lowest frequency of pressure wave energy to be transmitted between the first and second ends. Damping material in the waveguide near the vibratile surface is positioned so as to negligibly attenuate bass frequency energy while of sufficient volume to damp peaks at higher frequencies above the range of the bass frequency energy.

Abstract: An electroacoustic transducer 1 comprises a base 24 made of a magnetic material, a magnetic core 22 erected on the base 24, a diaphragm 20 made of a magnetic material and spaced from the magnetic core 22, a magnet 25 constituting a magnetic circuit together with the base 24, the magnetic core 22, and the diaphragm 20 and supplying a static magnetic field, a coil 23 placed around the magnetic core 22 for supplying an oscillating magnetic field to the magnetic circuit, a support ring 26 for supporting the diaphragm 20, a lower housing 30 for accommodating such members, and an upper housing member 10 press-fitted over the entire periphery of the support ring 26.

Abstract: Acoustic point source transducer apparatus including a high-output acoustic sound source propagating sound through a long, flexible tubing having an open end with a small diameter. Sound radiates from the small diameter open end effectively acting as an acoustic point source. A flexible sleeve encasing the terminal end of the tubing permits convenient wand-like placement of the acoustic point source by a human operator and an electromagnetic position sensor at the small diameter open end determines point source position. The invention provides a convenient, nondirectional approximated acoustic point source for improved acoustic measuring, especially desirable for near-field Head-Related Transfer Function measuring.

Abstract: A speaker has a substantially reduced overall size while producing a complete low frequency sound range at high output amplitude. The speaker includes a main body having open sections at both ends thereof. A sounding body pinched by ringed first dampers is secured to each of the open sections of the main body so that the inside of the main body is kept air-tight. A first opening is provided at the middle part of the side of the main body. Lid members are secured on the outside of the two sounding bodies via a ringed second damper so as to keep the inside of the lid member air-tight. A second opening is created around the middle of the bottom of each of the lid members. A disc-like membrane is secured to the second dampers such that the lid members cover the membranes and cover the open section of the main body to keep the inside of the lid members air-tight.

Abstract: An adjustable speaker system includes a speaker enclosure having at least a forward facing surface, the speaker enclosure enclosing a speaker with a forward facing acoustic outlet from which sound may emanate in a forward direction. The system further includes at least one reflector, and preferably a pair of independently adjustable reflectors, with a sound-reflecting rearward facing surface, each reflector being pivotably secured adjacent the acoustic outlet and pivotable relative to the acoustic outlet between a non-reflecting orientation wherein the sound-reflecting rearward facing surface is substantially in alignment with the forward direction, thereby to only minimally reflect sound emanating from the acoustic outlet, and a reflecting orientation wherein the sound-reflecting rearward facing surface is substantially angled to the forward direction, thereby reflecting impinging sound emanating from the acoustic outlet laterally to a respective side.

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: A surface acoustic wave device includes a quartz rotated Y-cut plate and at least one interdigital transducer disposed on the quartz rotated Y-cut plate. The quartz rotated Y-cut plate has a Euler angle represented by (0, .theta., .phi.). The angle .theta. is within a range of about 125.degree.<.theta.<130.degree. or equivalents thereto, and the angle .phi. is approximately 90 degrees. The interdigital transducer is made of tungsten.

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 directional speaker system includes an enclosure having an inner surface, an outer surface, an open end, and a closed end, a speaker driver directed toward the open end and mounted near the closed end of the enclosure, an in-line phase plug mounted in front of the speaker driver for manipulating the wavefront of sound waves produced by the speaker driver, and a preferably frustoconical shaped wave guide provided between the speaker driver and the open end of the speaker enclosure. The in-line phase plug preferably has a plurality of channels. The open end of the enclosure is preferably provided with an acoustically absorbent material around its inner perimeter. A second acoustically absorbent material is provided between the speaker driver, the in-line phase plug, and the wave guide, and the speaker enclosure. The in-line phase plug, wave guide phase plug and baffle plate operate to flatten the wavefront.

Abstract: In the invented speaker system, a passive radiator 401 is mounted on a top board 403a of baffle 403 in a direction opposite to a speaker unit 402. The speaker unit 402 is mounted on the opening of a cylinder 403b protruding from top board 403a at a place inner from the end. The remaining part of the opening is closed with a sub-baffle 406, to form a front closed cavity 404 and a back closed cavity 405. In this way, both the passive radiator 401 and the speaker unit 402 are fixed to the top board 403a whose rigidity being the highest; which reduces the unwanted vibration.

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: 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 surface acoustic wave device includes a quartz rotated Y-cut plate and at least one interdigital transducer disposed on the quartz rotated Y-cut plate. The quartz rotated Y-cut plate has a Euler angle represented by (0, .theta., .o slashed.). The angle .theta. is within a range of about 125.degree.<.theta.<130.degree. or equivalents thereto, and the angle .o slashed. is approximately 90 degrees. The interdigital transducer is made of tungsten.

Abstract: A laptop computer is disclosed that includes an improved audio speaker system. The laptop computer typically is designed to have a first shell and a second shell that are attached together. Typically located within the first shell are a central processing unit, a keyboard, and other circuits such as a battery, a hard disk storage, and other connectors such as a PCMCIA slot. A video monitor is typically located in the second shell of the laptop computer and is coupled to the central processing unit via a system bust, or a video driver is provided that may be subsequently coupled to the CPU, such that the video driver drives the video monitor. Then, an audio speaker system is provided that in one embodiment is mounted in a back portion of the second shell that is located opposite the video monitor. This audio speaker system includes a transmission line comprising a first piezo speaker and a second piezo speaker.

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.