Abstract: A miniature telephone handset that is convertible into a headset for use in conjunction with a telephone base unit. The telephone handset includes a housing, a microphone mounted near one end of the housing, an earphone mounted near the other end of the housing, a cable for electrically connecting the microphone and the earphone to the telephone base unit, a bushing rotatably coupled to the housing near the earphone end, and a removable headband adapted for insertion into the bushing and operable for supporting the housing next to a user's head when used as a headset.

Abstract: A microphone arrangement, suitable for a telephone handset, comprises an array of microphone transducers, conveniently pressure transducers arranged at the vertices of a cube. Signal processing circuitry derives from the transducer outputs signals representing the magnitude and direction of the pressure gradient of the sound field at the array. In response to these signals, the microphone transducer outputs are weighted so as to direct the directional sensitivity lobe of the microphone towards the source of the maximum sound detected thereby.

Abstract: In an electroacoustic converter, center pole and top plate which constitute a magnetic circuit are mechanically abutted against each other by interposing an air gap defining member therebetween. The air gap defining member is a projection provided on the center pole or top plate, otherwise non-magnetic ring-like sleeve covered on the center pole or top plate. An air gap in the magnetic circuit can be precisely defined by the air gap defining member without using any alignment tool in its assemble process.

Abstract: Loudspeaker unit including a frame (FIG. 2) serving as sound guide to which the loudspeaker chassis (FIG. 1) is releasably fastened. According to the invention, form-locking cooperating detent means (4-6, 29-31) are provided on the frame and on the loudspeaker chassis. The loudspeaker chassis can be inserted into the frame by means of a relative translatory movement and can be removed by a rotational movement. Thus it becomes possible to install the loudspeaker in the frame and remove the loudspeaker from the frame by means of automatic machinery.

Abstract: A device for disinfecting and protecting a part of a telephone handset including a substrate of general shape corresponding to the telephone part, a layer of adhesive on one side of the substrate to receive a disinfectant carrying pad and to enable the substrate to be attached to the telephone part, and a pad for carrying a disinfectant affixed to the substrate by the adhesive layer or other means to contact the telephone part when the substrate is attached to the telephone part.

Abstract: A pair of sensitive microphones or transducers are mounted on a user's body, spaced apart by a distance equal to one-half a wavelength of the center frequency of a range of frequencies to be emphasized. By summing the outputs of the two microphones, sound in the broadside or look direction (i.e., the direction the listener faces, the microphones being on a line perpendicular to this direction) are emphasized; sounds in the endfire or side directions are nulled or produce a substantially null response in the region of the center frequency defined by the microphone spacing. A third microphone may be added that is not equally spaced from the microphones on either side, but is spaced to provide half wavelength distances which define maximum and null responses centered at the other points within the frequency range (1-4 KHz) desirable for highly effective hearing. The summed signal from each mircophone pair is bandpass filtered. Three bandpass filters are used.

Abstract: A telephone dial shielding device is provided to cover the dialing area on a telephone base to prevent an unauthorized person from making calls therefrom. A modification includes a door which when unlocked will uncover the dialing area so that a person can make calls without removing the device completely from the telephone base.

Abstract: Audio-band electromechanical vibration converter characterized in that a yoke having a permanent magnet and a magnetic gap formed therein is displaceably housed by a damper in a casing to which a vibration plate is attached; a coil attached to the casing is placed in said magnetic gap; and the casing gives an output of a mechanical vibration synchronized with a low-band audio-signal.

Abstract: A microphone boom hinge is comprised of a pair of identical members disposed in locking interfitting relationship, each member having an end to be stationarily disposed on an end of a microphone boom and the other end having a pivot pin and an aperture on spaced apart longitudinally extending ears and configured to rotate about a transverse axis to provide for articulatory motion of an assembled boom.

Abstract: A rest for a service receiver of an automobile telephone includes a plate-shaped lower part and a cap-shaped upper part having a depression therein for accepting the telephone trumpet portion of the service receiver. In an elevated region of the rest, two slot-shaped recesses and a pot-shaped portion lying therebelow are provided for mounting two retaining plates with a magnet disposed therebetween which magnetically engages a steel plate in the service receiver.

Abstract: A pop up telephone having a latch carried on a latch carrier with a slot. A cap having a post, the post capable of vertical travel within the slot. The post capable of engagement with the latch. A spring, contained below the cap and within the latch carrier is for moving the cap in a vertical direction. The body is for housing the latch carrier, the cap and hand set. The hand set resting on the cap and residing flush within the body. The hand set capable of popping out of the body after being pressed downward.

Abstract: An earcup suspension for a headphone includes a housing, having a vertically oriented slot and stationarily mounted on the lower end of a headband to be disposed over the top of the headphone user, an earcup mounting includes a vertical member slidably extending through the slot in the housing and having a rack surface configured to coact with a similarly configured inwardly biased detenting rack stationarily disposed in the slot whereby the earcup mounting may be adjusted vertically with respect to the lower ends of the headband.

Abstract: An interface for connection between incoming telephone lines and the customers equipment has a base for mounting on a support surface, with terminals for connection of incoming telephone lines and one or more plug-in positions for plug-in modules. Protectors are positioned in the modules. Each module has a modular jack. An intermediate cover fits over and is attached to the base, covering also the modules but with one or more apertures for access to the jack or jacks. The conductors from the customers equipment either terminate in modular plugs which insert directly into the jacks or terminate in spade terminals which are connected to terminals on the intermediate cover. In the latter case, a short interconnect cable connects at one end to these terminals and at the other end has a modular plug for insertion into a jack. An outer cover extends over the intermediate cover and the modular jack or jacks.

Abstract: A second order gradient microphone with unidirectional sensitivity pattern is obtained by housing each of two commerically available first order gradient microphones centrally within a baffle. The baffles have flat surfaces, are preferably square or circular and have parallel surfaces the two baffles being parallel to each other. The rotational axes of the microphones are arranged to coincide. The output signal from one of the microphones is subtracted from the delayed signal output of the other.

Abstract: A telephone switch-hook actuator apparatus for use with a telephone unit incorporating a conventional handset whereby the telephone switch-hook actuator apparatus serves to operate the telephone switch-hook in place of the handset. Accordingly, a headset worn upon the users head may be utilized with a conventional telephone unit, particularly those telephone units which utilize electronic logic line switching circuitry.

Abstract: A telephone receiving apparatus (100) rigidly retains a telephone handset (200) without the need for a release lever. In the preferred embodiment, a moveable boss (108) and a rigid boss (106) engage corresponding notches (208 and 206) in the earpiece of the handset during insertion. The handset (200) is removed by moving it forward until the rigid boss (106) is cleared. The improved telephone receiving apparatus of the present invention may be advantageously utilized in mobile telephones and a variety of other applications where a telephone handset is subject to shock and vibration during normal use.

Abstract: In a telephone usable as both table mounted type and wall hung type by selectively changing the direction of attaching of a holding board of which upper side extends at a certain inclination angle relative to the bottom thereof, a casing of the telephone is detachably fitted onto the holding board. The holding board includes receiving means for receiving telephone cable in the form of a bundle and it is formed with an inlet hole through which the cable is introduced into the holding board and an outlet hole through which it is taken from the same. As required, an excessive part of the cable is received in the holding board and thereby an usable length of cable can be reduced remarkably.

Abstract: A loudspeaker driver has a plastic basket having front and rear portions. The front portion is formed with six radial ribs extending between a central motor cup support and an annular rim. A cup-shaped front pole piece is molded into the pole support and formed with an axial groove for accommodating an axial lead extending from the front end of a voice coil that moves axially in a gap between the circumferential wall of the front pole plate and a circular rear pole plate and circular disk neodymium disk magnet sandwiched between the rear pole plate and the closed end of the front pole plate. Flat tinsel leads are crimped to ends of the voice coil and brought out through slits in the cone to terminals in opposite sides of the rear portion of the basket. The circumferential edge of the cone is clamped between the front and rear portions of the basket and ultrasonically bonded to an annular surface on the rear of the front portion.

Abstract: To provide for better fitting and pleasing out appearance of a hearing aid having an element introducible into the ear canal of a user, and an externally accessible housing which retains electronic components, a battery, and ON/OFF switch and volume control elements, the housing is formed in spherical or, rather, truncated-spherical shape, removably fitted on a fitting element introduced into the ear canal. This spherical shape is less obtrusive than others, and may be formed similar to costume jewelry.

Abstract: A removable, washable cover for a telephone handset comprises an outer fabric cover, suitably cotton, and an inner cushioning layer also preferably cotton having a cavity for receiving a telephone handset. An elongated opening is provided along the rear or front panels of the cover and cushioning layer. The edges of the cover along the opening are provided with cooperative fastening materials such as two strips of VELCRO.