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| Number | Title | Issue Date |
| 4956868 | Magnetically shielded electromagnetic acoustic transducer An electromagnetic transducer including a diaphragm mechanically connected to an armature, a coil wound tranversely around the armature, a permanent magnet adjacent the armature, and one or more additional magnetic members completing a magnetic circuit ha... | 09/11/1990 |
| 4867267 | Hearing aid transducer This invention is concerned with a hearing aid including a microphone, an adjustable amplifier, and an acoustic transducer positioned within a first, large acoustic chamber defined by an in-the-ear housing. The acoustic transducer is in communication with... | 09/19/1989 |
| 4837833 | Microphone with frequency pre-emphasis channel plate A high frequency emphasis microphone particularly adapted to a hearing aid application provides a steeply rising frequency response characteristic relative to frequency, and has a low pass sonic attenuator for providing to the undriven side of the microph... | 06/06/1989 |
| 4815560 | Microphone with frequency pre-emphasis A stepped frequency microphone particularly adapted to a hearing aid application provides a stepped frequency response characteristic relative to frequency, and has a low-pass sonic attenuator for providing to the undriven side of the microphone diaphragm... | 03/28/1989 |
| 4807612 | Passive ear protector A passive ear protector device for positioning in the ear of the user for protecting the ear from sounds of high intensity. The device attenuates sound in a manner which tends to preserve the natural quality of the incoming sound, in particular with respe... | 02/28/1989 |
| 4800982 | Cleanable in-the-ear electroacoustic transducer A hearing aid including a microphone, an adjustable amplifier, and a transducer comprising an acoustic driver driving a diaphragm disposed within an acoustic chamber, all mounted in an in-the-ear housing having a sound outlet passage leading from the acou... | 01/31/1989 |
| 4730283 | Acoustic transducer with improved electrode spacing An acoustic transducer with an improved electret assembly mounting for providing spacings between the fixed and movable electrodes, and having as one feature the lowering of the undesired capacitance therebetween.... | 03/08/1988 |
| 4689819 | Class D hearing aid amplifier A sub-miniature power amplifier for hearing aids configured to be completely self-contained and to fit within the user's ear features a Class D amplifier stage providing a peak-to-peak output voltage greater than the power supply voltage. By configuring a... | 08/25/1987 |
| 4592087 | Class D hearing aid amplifier A subminiature power amplifier for hearing aids configured to be completely self-contained and fit within the user's ear features a Class D amplifier stage. By configuring all signal elements as digital units, circuit balance is readily maintained. A subs... | 05/27/1986 |
| 4509193 | Miniature acoustical transducer with filter/regulator power supply circuit A battery-powered miniature acoustical transducer system for a hearing aid, including a microphone and an amplifier, has a combination filter and voltage regulator incorporated in its power supply circuit; the filter/regulator includes a field-effect tran... | 04/02/1985 |
| 4466119 | Audio loudness control system An audio loudness control system for processing a broad dynamic range of audio input signals (e.g. 70 to 100 dB) comprises a gain-controlled amplifier, a feed forward control signal generator having an audio signal input that develops a feed forward gain ... | 08/14/1984 |
| 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 |
| 4272654 | Acoustic transducer of improved construction An improved transducer construction of the type having a U-shaped armature mounted to have a vibrating arm extending through the tunnel of a cooperating coil. The arms of the armature are joined by a smooth bend to provide improved shock-resistant charact... | 06/09/1981 |
| 4151480 | FET Amplifier with protective circuit The present invention relates to an acoustic transducer including an improved electret assembly mounted in an improved case and having an electronic amplifier circuit comprising FET transistors. The electronic circuit further includes means for protecting... | 04/24/1979 |
| 4149032 | Priority mixer control A priority mixer control for a multi-microphone audio system comprises a threshold signal generator that develops a scanning D.C. threshold signal starting at a maximum level for a time T1 and then decreasing in amplitude as a function of time. Each micro... | 04/10/1979 |
| 4063034 | Audio system with enhanced spatial effect An audio system comprising a record player, tape deck, microphones, or other signal source which generates stereo signals supplied to two main speakers for reproduction; the stereo signals are added together to afford an intermediate signal which is subje... | 12/13/1977 |
| 4063050 | Acoustic transducer with improved electret assembly The present invention relates to an acoustic transducer including an improved electret assembly mounted in an improved case and having an electronic amplifier circuit comprising FET transistors. The electronic circuit further includes means for protecting... | 12/13/1977 |
| 4006321 | Transducer coupling system A transmission system is disclosed having an improved means for coupling sound to and from a transducer. The system includes a main sound channel and an associated cavity; damping elements are selectively positioned in or adjacent the cavity to provide a ... | 02/01/1977 |
| 3935398 | Transducer with improved armature and yoke construction An electroacoustical transducer of the magnetic armature type having an efficient electromagnetic configuration with the armature being formed integrally with a support yoke. The yoke includes a base from which two arms extend generally parallel to the ar... | 01/27/1976 |
| 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 |
