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| Number | Title | Issue Date |
| 4768614 | Unidirectional enhancer for microphones A hollow enclosure that suspends a bidirectional microphone element within, in such a fashion as to improve the unidirectional characteristics, of said bidirectional microphone.... | 09/06/1988 |
| 4658932 | Simulated binaural recording system A microphone system comprising a pair of microphone capsules, a pair of planar barriers positioned at an angle to each other, with each microphone capsule secured to the center portion of a barrier positioned between the microphone capsules. A baffle is p... | 04/21/1987 |
| 4653606 | Electroacoustic device with broad frequency range directional response An electroacoustic device comprises an array of electroacoustic transducer elements for producing a prescribed directional response pattern at a first frequency. Each element includes apparatus for restricting the frequency range of sound waves incident o... | 03/31/1987 |
| 4648480 | Condenser microphone having resistance against high-temperature and radioactive rays A condenser microphone utilizable at high temperature and intense radioactive rays. The microphone has a tension ring and a backplate, both of which are made of a metal having a small coefficient of linear expansion relative to the other parts of the micr... | 03/10/1987 |
| 4646873 | Microphone and acoustic equalizer therefor An acoustic equalizer adapted for use with a microphone includes a resonator plate having front and back faces, a lip surrounding the plate and defining a first air cavity in the back face of the plate, and a plurality of apertures formed through the thic... | 03/03/1987 |
| 4640382 | Acoustic frictional resistance construction and method of producing an acoustic frictional resistance using a laser Acoustic frictional resistance comprises a plate having at least one laser-formed hole therethrough. The plate is formed by positioning a plate preferably one having a thickness smaller than one and one-half milimeters alongside a laser and directing the ... | 02/03/1987 |
| 4625828 | Acoustic reflector for ground plane microphone A flush-dish microphone system for measuring aircraft flyover noise is disclosed. The system includes an acoustically hard base supporting a microphone. The base is configured along its periphery to define a plurality of outwardly extending tapered member... | 12/02/1986 |
| 4625827 | Microphone windscreen A unidirectional microphone windscreen which includes portions formed of compressed foam and uncompressed foam located on opposite sides of the capsule to enhance directivity of the microphone.... | 12/02/1986 |
| 4620605 | Suspension for electro-acoustical transducers A moulded suspension for an electro-acoustic transducer in the form of a microphone or a receiver has three regions. A transducer supporting region fits closely around the transducer. A tubular inlet region connects the acoustical inlet or outlet of the t... | 11/04/1986 |
| 4600077 | Microphone wind shroud A microphone wind shroud having a integral mounting means for being slidably mounted to an omnidirectional or unidirectional microphone, such as those integrally mounted on video cameras. A semi-rigid grid-like external shell shrouds the microphone head. ... | 07/15/1986 |
| 4555598 | Teleconferencing acoustic transducer A directional acoustic transducer includes a plurality of acoustic paths each having first and second ends. The second end of each path terminates in the atmosphere. An electroacoustic device is attached to an acoustic cavity and the acoustic path first e... | 11/26/1985 |
| 4508192 | Microphone diaphragm A diaphragm for electrostatic and electrodynamic microphones which has a distinct directional pattern comprises a taut diaphragm having a thickness of less than 8 microns and a diameter of 10 millimeters at most and which is made of an elastically extensi... | 04/02/1985 |
| 4458778 | Stethoscope construction A microphone for stethoscopes and the like having a weighted head member with a recessed cavity formed therein. A diaphragm is sealed to the head member with an adhesive material to provide an airtight cover for the cavity. The mass of the head member cau... | 07/10/1984 |
| 4450930 | Microphone with stepped response A microphone, particularly for hearing aid application, said microphone providing a stepped response characteristic relative to frequency wherein low frequency sounds will couple to the associated hearing aid with a restricted amount of amplification, whi... | 05/29/1984 |
| 4447678 | Electracoustic transducer An electroacoustic two-way transducer assembly particularly for headphones and microphones comprises an electrostatic treble system having an electrostatic treble system disphragm and an electrodynamic system disposed under said electrostatic treble syste... | 05/08/1984 |
| 4436966 | Conference microphone unit A microphone unit particularly suitable for conference applications is provided, wherein an acousto-electric transducer is disposed between two dish-like back-to-back sound collectors, each having a central aperture exposing one side of the transducer, wh... | 03/13/1984 |
| 4410770 | Directional microphone A unidirectional dynamic microphone provided with a first sound path to the forward side of the diaphragm and a second sound path to the rear side of the diaphragm in which the second sound path has a chamber coupled to a second chamber associated with th... | 10/18/1983 |
| 4401859 | Directional microphone with high frequency selective acoustic lens A unidirectional dynamic microphone provided with a first sound path to the forward side of the diaphragm and a second sound path to the rear side of the diaphragm, a Helmholtz resonator disposed in the first sound path having a sound entrance, and a diff... | 08/30/1983 |
| 4151777 | Piano sound pickup method and device A method and a device for picking up sounds from a piano by a microphone placed between a wall of a piano case in opposed relation with a sounding board and a surface located in opposed relation with the sounding board of a sound-absorbing member. The sou... | 05/01/1979 |
| 4073366 | Disposable noise reducing hearing aid attachment A disposable noise reducing hearing attachment provided for covering the sound inlet of a hearing aid to reduce the amplitude of random noises such as wind noises and to prevent dirt and moisture from entering the sound inlet. The attachment includes a fl... | 02/14/1978 |
| 3940575 | Directional microphone A pressure gradient directional microphone of the moving coil type in which the acousto-mechanical function of the transducer is achieved by a vibratile diaphragm the major area of which is of coneiform shape and the central portion of which is of dome sh... | 02/24/1976 |
| 3930560 | Damping element A damping element comprising fiberous fuseable material shaped to form a cup-like member which may be inserted in the sound openings of an acoustic transducer to provide a selected acoustic resistance.... | 01/06/1976 |
