Abstract: An underwater voice communicator in which the preferred embodiment comprises a pair of tapered tubes in communication with a diver's mouth. The tubes are constructed of a material having a sound impedance similar to the sound impedance of water. Sound energy issuing from the mouth of a diver is reflected down the length of the tapered tubes to an area of the tube that concentrates the sound for injection into the surrounding water.

Abstract: A high-frequency loudspeaker has a movable diaphragm which is moved to and fro by an actuating unit. The actuating unit, under the impulses of a signal to be converted into sound waves, changes in dimension in at least two opposed directions. The diaphragm is made up of two rigid hemispherical shell diaphragms which are connected together through a resilient ring to constitute a pulsating, closed sphere. An actuating unit is disposed inside the sphere and is firmly connected to the two diaphragms, so that the forces emanating therefrom are imparted to the two diaphragms and in directions at right angles to the plane connecting between the two diaphragms. A device is provided for equalizing the atmospheric pressure within and outside the closed, spherical body. Instead of connecting the diaphragms through a ring it is also possible to have the diaphragms merge without contact through a labyrinthic seal.

Abstract: An electrodynamic loudspeaker radiates sound in all directions and with a high output for a low and medium sound frequencies. It comprises two hemispherical movable diaphragms which are arranged on either side of a disc-shaped carrier part. The diaphragms are connected with the carrier part by flanges and constitute a pulsating sphere. In this sphere and connected in each case with one of the diaphragms are actuating units with permanent magnets and in each case, an oscillatory coil. Each oscillatory coil is connected to its respective diaphragm through stiff transition parts, preferably in the form of spherical shells. Openings are provided for an atmospheric pressure equalization between the interior and exterior of the breathing sphere.

Abstract: A diaphragm having a pattern of wrinkles adapted so that the diaphragm is both radially and tangentially expandable with respect to a reference point in that central portion.

Abstract: An electro-acoustic transducer has a planar annular diaphragm suspended at both the inner and outer periphery. The transducer component is situated within the inner periphery and interacts with the diaphragm via outwardly extending connections.

Abstract: A barrel-shaped diaphragm comprising a plurality of barrel stave-like strips with slits forming gaps between them is mounted on the vibration coil of a vibration generator that is based on a housing. A traverse bar which is based on the housing extends up through the center of the diaphragm. A sound conducting member that is cylindrical at the bottom and domed at the top is disposed on the vibration generator, within the diaphragm, and provides a gap of increasing cross-sectional area expanding toward the open upper end of the diaphragm. An inverted pot-shaped top is mounted on the upper end of the diaphragm. This top has an upper end wall with a depending sidewall that tapers in conically near the lower end. A plurality of struts extend obliquely from the tapered portion to the traverse rod to connect the lower end of the top, and thus the upper end of the diaphragm to the rod, and thus to the housing of the fibration generator.

Abstract: A rigid surface transducer of the electroacoustic type more commonly referred to as an audio speaker. The transducer comprises an improved diaphragm and driver configuration and improved excitation modes. The improved features employ a rigid diaphragm which is driven in a coherent linear type motion.

Abstract: An annular suspension for supporting an acoustic diaphragm around its edge and permitting axial diaphragm movement. The suspension is made of thin folded sheet material, such as aluminum, and includes inner and outer concentric circular fold lines having a series of pyramid-like structures therebetween to control anti-nodal resonance of the suspension independently of the desired first resonance. The suspension may be formed integrally with the diaphragm, which may be of the dome or cone configuration and is provided with a conventional voice coil. The suspension permits axial diaphragm movement by slight flexing at the fold lines, minimizing stretching of the sheet material and preventing torsional movement of the diaphragm. When the suspension is at rest, the inner and outer circular fold lines desirably lie in a common plane normal to the diaphragm axis and the pyramid-like structures project alternately on each side of that plane.

Abstract: An improved sound reproducing device which includes a housing, an acoustic diaphragm and drive means for driving the acoustic diaphragm. Corrugated compliant coupling means is provided for supporting the acoustic diaphragm with respect to the housing in a predetermined lateral position for longitudinal movement relative thereto. The compliant coupling means has a lateral cross-sectional shape which is noncircular so that the acoustic diaphragm is centered in a predetermined lateral position but which allows freedom of movement in the longitudinal direction. The drive means provides the relative longitudinal movement between the acoustic diaphragm and the housing. In a preferred embodiment, the corrugated compliant coupling has a rectangular cross-sectional shape.

Abstract: A loudspeaker includes a flat plate diaphragm mounted in a speaker frame and which is driven by a plurality of magnetic drivers each having a magnetic gap, a voice coil bobbin connected to the diaphragm at a respective node portion of the divided vibration mode and a voice coil in the respective magnetic gap and being wound around the voice coil bobbin therein. Rotational vibration of the diaphragm is prevented by a pole member which is connected from the center of the diaphragm to a damper supported behind the speaker frame on a damper supporting frame. The leverage due to the longer length of the pole member makes the damper member more effective in resisting rotational vibration. The damper supporting frame is mechanically connected to the speaker frame and/or magnetic drivers to add stiffness to the structure.

Abstract: A drone acoustical transducer for a loudspeaker system has an improved means of interconnecting the generally conical speaker diaphragm and supporting basket. In conventional fashion, the acoustical transducer includes a generally conical speaker diaphragm supported within a vented basket having an open front and a rear wall. The large, front end of the diaphragm is flexibly connected to the front of the basket by means of a supple annulus. The basket has a rear wall having an upstanding boss which is coaxial with the diaphragm and smaller in diameter than the small end of the diaphragm. A flexible spider interconnects the small end of the diaphragm with the boss, allowing full excursion of the vibrating speaker diaphragm. To allow for maximum excursion of the diaphragm, the rear wall of the basket may be concave as viewed from the rear.

Abstract: A communications device for use under water by a human speaker. A tubular base member has a mouthpiece located at one open end thereof and an inflatable air bag mounted about another open end thereof. In use, the speaker places the mouthpiece around his mouth to form an air seal therebetween and blows into the air bag to partially inflate it. When so inflated, the speaker talks into the device with voiced sounds being transmitted to the surrounding water through suitable transmitting means attached to the base member, preferably the air bag itself. During talking, the air bag receives and returns the air used by the speaker, thereby effectively preventing the escape of air bubbles from the device which otherwise interfere with communications. The air bag is preferably an elongated, flexible balloon which can be stretched into an extended position when speaking into it under water.

Abstract: An acoustic transducer comprising a light weight diaphragm is disclosed in which the internal vibrational resonant modes of the diaphragm are prevented or blocked without damping effects by mounting of the diaphragm on a rigid base parallel thereto by means of a multiplicity of similar parallelograms with flexible corners having dynamically rigid sides the lengths of which are a small part of the wavelength therein of the highest frequency acoustic waves to be transduced with no two adjacent parallelograms being spaced from each other by a distance which is more than a small part of the wave length in the diaphragm of the highest frequency acoustic waves to be transduced. Preferred embodiments are described in which the diaphragm is divided into elements by the parallelograms with the individual elements made rigid by means other than the materials used, for example, by providing appropriate shape or tension in such element.

Abstract: An electroacoustic transducer in which a diaphragm of a loudspeaker for converting an electrical signal into an acoustic signal comprises a lower section and an upper section thereof which are split axially of a center pole of a magnetic circuit. The lower section of the diaphragm has a concave-curved surface such as an exponential-curved surface while the upper section of the diaphragm has a parabolically-curved surface. A roll is provided at the joint area of the upper and lower sections of the diaphragm. In this manner, a high-band resonance frequency of the loudspeaker is raised to a high frequency and Q of high-band resonance is lowered to broaden a reproduction frequency range of the loudspeaker.

Abstract: The invention relates to an electroacoustic transducer for the sound reproduction, comprising a substantially olive-shaped diaphragm body formed of a plurality of convexly pre-curved diaphragm segments capable of bending, damping material accommodated within the diaphragm body, at least one oscillation generator provided on one end of the diaphragm body and having its moving coil connected to the diaphragm body, and means for rigidly connecting the other end of the diaphragm body to the housing of the oscillation generator.

Abstract: A loudspeaker comprising a plurality of stages extended along a predetermined direction, each stage of which includes a movable diaphragm having a resonance out of the frequency range of reproduction and movable within a support structure. The diaphragms are driven transversely in unison by a distributed drive system capable of propagating longitudinal acoustical waves at a very high velocity and therefore also nonresonant within the range of the speaker. The drive system is connected to suitable electro-acoustic motional transformer such as a moving coil permanent magnet system. The coil longitudinal drive means and diaphragm masses are made exceedingly low so that the collective mass is comparable to the air mass in the immediate vicinity of the speaker which air mass serves to load the same. No damping materials are employed.

Abstract: An audio loudspeaker comprising a diaphragm which is rotationally symmetrical about an axis, the diaphragm including a sound propagating surface extending between a larger circular edge and a smaller circular edge spaced apart therefrom along the axis in the direction of sound propagation. The voice coil former is secured to the diaphragm adjacent the smaller edge, the larger circular edge is fixed relative to the magnetic structure (e.g., to the mounting panel) and the included, initially acute, angle between a tangent to the sound propagating surface and the axis increases as the point of tangency moves from the smaller edge to the larger edge.

Abstract: A planar diaphragm, preferably for loudspeakers where, on the rear face side there is an asymmetrically shaped sound producing portion, surrounded by marginal and channel shaped portions to assure that sound waves generated by said sound producing portion will not trespass said portion, and said marginal portion is provided plugs of different density than said diaphragm, to modify the vibratory characteristic of the sound producing portion and thereby improve the response curve.

Abstract: A dynamic loudspeaker including a dome-type diaphragm having at least one convex surface and another concave surface, contiguous with the convex surface. Specifically, the concave surface is an annular portion surrounding the convex surface.

Abstract: An elliptically tapered tube or funnel shaped element is fixed to a loudspeaker so that its large diameter end overlies a central region of the loudspeaker diaphragm and such that its small diameter end extends away from the diaphragm. The loudspeaker diaphragm need not extend beyond the line on which it is connected to the funnel element, but does in the preferred embodiment. The funnel element has a cross-sectional shape that differs on planes parallel to the plane of the base which lie at different distances from the base. A funnel that is circular in cross-section at all of those parallel planes does not exhibit high fidelity response with the brilliance and clarity that distinguishes speakers having the non-uniform cross-sectional shape.

Abstract: The present invention comprises a radially pulsating cylindrical surface operating as a wave transmission-line. The device is responsive to electrical means and may be practically utilized to generate pressure waves. A conventional electromagnetic driving system is employed with the novel cylindrical surface. A cylindrical voice coil is affixed to the cylindrical surface co-axially. The surface may comprise a matrix of helically oriented fibers suspended in an elastomeric impregnant. Damping means may be provided both internally and terminally. The radiation produced is omnidirectional.

Abstract: A speaker assembly comprising a dome shaped diaphragm, the cross section along the plane containing the base of the diaphragm having an oval contour; a voice coil connected to the diaphragm; magnetic means operatively associated with the voice coil; and support means for supporting the diaphragm, voice coil and magnetic means.