Abstract: A real time cochlear implant processor (10) receives an audio input signal and extracts spectrum segments by operation of bandpass filters (18, 20). In each channel temporal circuitry detects the zero slope points of the filtered audio input signal and generates a control signal which operates a gate (66). Amplitude circuitry includes a reference voltage source for providing positive and negative polarity signals for a first mode of operation. The reference signals are routed through the gate (66) by the control signals. In a second mode of operation the audio input signal, after logarithmic amplification, is passed through the gate (66) by operation of the control signals. In a third mode of operation the audio input signal is squared through infinite clipping and the resulting signal is gated by the control signals through the gate (66). The outputs of the channels are combined in a summing circuit (78) and passed through a buffer (82) to produce a driver signal for an auditory implant electrode.

Abstract: A capacitive acoustic transducer comprises a first field plate mounted to a semiconductor substrate structure, a second metal field plate having first and second oppositely and substantially exposed surfaces, and a mounting arrangement for mounting the second field plate to the semiconductor substrate structure so that the first and second field plates form an acoustically responsive capacitor, the first exposed surface of the second field plate substantially facing the first field plate, the mounting arrangement allowing the second field plate to respond to acoustic energy for altering the capacitance between the first and second field plates, the mounting arrangement including first and second contacts for respective connection to the first and second field plates.

Abstract: In a laminated structure, such as a structural component of an aerospace vehicle or the like, which is fabricated of layers of filament composite material, means is provided for protection against lightning strike damage and electromagnetic interference. In particular, the outer surface layer of the filament composite material is fabricated of conductive metallic-coated filaments to provide a conductive barrier to disperse the current from lightning or other electromagnetic sources. The filaments may be fabricated of a composite material such as glass which has an aluminum coating. The structure may be woven or filament wound with intermixed resin, and the metallic-coated filaments are cured simultaneously with the entire laminated structure of filament composite material.

Abstract: A high fidelity loudspeaker system having at least one additional smaller speaker mounted above the largest speaker. The loudspeaker is of the type having a permanent magnet and a moving coil, and the smaller speaker or speakers are mounted on a support member which passes through the moving coil of the largest speaker. The mounted base for the smaller speaker or speakers is held to a support pedestal by a set of male and female interlocking members.

Abstract: By adding a secondary magnetic piece with a partially open magnetic circuit to the front surface of a yoke connected to a primary magnetic piece, the magnetic flux leakage from the main magnetic piece is reduced on one hand and the magnetic flux extending across a magnetic gap is intensified through formation of a favorable magnetic field. This horn speaker is particularly useful in a ship where a horn speaker as an alarm is often required to be placed near magnetically sensitive equipment such as a compass.

Abstract: A dual communication system is disclosed including a microphone for mounting for use by a wearer of a protective face mask, the output signal from the microphone being communicated to both a speaker system for local, audible broadcast and to a transmitter for remote broadcast by radio signal.

Abstract: A hearing aid is made up of an automatic filter circuit for transmitting an input signal in a predetermined characteristic, and a low frequency component detecting circuit for detecting the low frequency component of the input signal, to change the characteristic of the automatic filter circuit according to the detection level, the cut-off frequency of the automatic filter circuit being changed according to the output control signal of the low frequency component detecting circuit.

Abstract: In an arc preventing apparatus of a transfer switch connected to an inductive load, the movable contact of the transfer switch is stopped temporarily while it is transferred from one stationary contact to the other by means of a rotary cam. The cam is provided with a high point, a low point and a peripheral portion intermediate the high and low points so that while the actuating lever of the movable contact is engaging the intermediate peripheral portion, the movable contact is held stationary.

Abstract: Headrest speaker device, in which the upper ends of pipes supporting a headrest on the upper part of a seat are in communication with speaker cabinets disposed at each side of the headrest and the lower ends of the pipes open toward the outside at the sides of the seat.

Abstract: An MFB loudspeaker comprising a detector element mounted on a diaphragm on a specific position, i.e., a nodal line of a primary resonance mode thereof for generating a voltage proportional to a component indicative the vibratory characteristics of the diaphragm.

Abstract: A loudspeaker primarily for the high frequency audio region includes a driving device coupled to a diaphragm of convex outer configuration and extending over more than 180.degree. spherical angle. The driving device changes the distance between the two coupling areas of the diaphragm under the action of an electrical signal applied thereto. Elastic deformations appear on the diaphragm which give rise to an emission of soundwaves.

Abstract: A bacteria destroying apparatus for use with a voice communication system such as a telephone system, and telephone systems which have such bacteria destroying apparatus included therewith. The bacteria destroying apparatus may adopt the form of a relatively thin, flat disc which is located in the mouthpiece of a telephone handset, and preferably in close proximity to the diaphram of the handset or any other portion of the voice communication system which normally collects a substantial amount of bacteria thereon as, for example, a result of close proximity of a user's mouth. The bacteria destroying apparatus generates radiation in a wave length range which is effective to destroy bacteria. In one embodiment, the radiation is generated when the element itself is electrically energized.

Abstract: A microphone arrangement focuses on a prescribed volume in a large room such as an auditorium. The arrangement includes a plurality of directable beam microphone structures. Each beam is directed to a prescribed location. The signals produced in the microphone structures are selectively adjusted to accept sounds from a predetermined volume surrounding the location and to reject sounds outside the prescribed volume.

Abstract: A rack for a wall-mounted telephone has an adjustable mounting structure, so that the rack may be mounted alongside different size telephones. The rack is also nestable within another similar rack to facilitate shipping and display of the racks. The rack may be used as a mini-data center independently of the telephone.

Abstract: A ribbon-type electro-acoustic transducer has a magnet system which comprises an upper plate (2, 3) and a center pole (1) between which an air gap (8) is formed. A diaphragm (7) on which conductors (9) are arranged is disposed in the air gap. The upper plate (2, 3) comprises two plate-shaped parts (2', 3' and 2", 3" respectively) between which a space (11) is formed in which an edge portion of the diaphragm is located. This results in a more homogeneous magnetic field so that the transducer distortion may be reduced. Moreover, the transducer sensitivity is improved and is suitable for handling signals in the mid-range audio frequency spectrum. The cavity (15) enclosed by the magnet system and the diaphragm (7) can be acoustically coupled, be via an additional cavity to a (bass-reflex) duct or an additional (passive radiator) diaphragm.

Abstract: A diaphragm type magnetic speaker with conductor runs on the diaphragm, the conductor runs having a multiplicity of conductors arranged in a band in each run which confronts portions of two magnetized strips with front faces of opposite polarity and the space between such magnetized strips. The width of the band of conductors exceeds the width of the space between adjacent magnet strips and traverses the entire transverse portions of both of the adjacent magnetized strips from which the magnetic field for the conductor run emanates.

Abstract: In an exemplary embodiment, a first shell has the contours of an individually fitted ear adapter and the second shell has a carrier plate penetrated by openings for adjustment elements of the hearing aid structure. In known devices, the covering of the cavity of the ear adapter has proven unfavorable both cosmetically as well as mechanically. In order to alleviate this, the disclosure provides that the inside space of a cover plate be provided with an internally disposed cavity for the carrier plate whose outside dimensions are smaller than the smallest dimensions to be expected for an individually fitted ear adapter, and that the second shell is significantly larger, so that, after application to the first shell, laterally projecting parts are cut off. The disclosed structure is particularly suited for employment given in-ear hearing aids.

Abstract: A telephone device comprises a transmitter-receiver having transmitter and receiver sections and to be mounted on a telephone body by setting these transmitter and receiver sections into a setting recess formed in the telephone body, a locking lever arranged in the telephone body to project into the setting recess and engaged with an engaged recess formed in one end face of the transmitter section to prevent the transmitter-receiver from coming out of the setting recess and to urge the transmitter section through the engaged recess in one direction, a lifting lever to urge the transmitter section in a direction in which it comes out of the setting recess. The telephone body has a wall face contacted with the other end face of the transmitter section, so that transmitter section is sandwiched and held between the wall face and locking lever.

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: A planar diaphragm type magnetic transducer with an acoustically transparent magnetic backing, and a diaphragm overlying and spaced from the magnetic backing, the magnetic backing having magnetized strips lying parallel to each other and adjacent magnetized strips having opposite polarities at their faces confronting the diaphragm, the diaphragm being stiff and resisting flexing and connected by a flexible surround at its periphery.