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Class Information
Number: 381/354
Name: Electrical audio signal processing systems and devices > Electro-acoustic audio transducer > Having acoustic wave modifying structure > Absorbing or attenuating element
Description: Subject matter wherein undesired sound intensity or vibration is lessened.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 4939783 |
Suspended speaker system |
Jul. 3, 1990 |
| 4898260 |
Loudspeaker mounting with integral back wave filter and wave modulating plate of same design |
Feb. 6, 1990 |
| 4893695 |
Speaker system |
Jan. 16, 1990 |
| 4891842 |
Sound output unit for installation in a ceiling structure |
Jan. 2, 1990 |
| 4854415 |
Hearing aid whose components are mounted in a hearing aid housing |
Aug. 8, 1989 |
| 4852177 |
High fidelity earphone and hearing aid |
Jul. 25, 1989 |
| 4834212 |
Sound muffler for covering the mouth |
May. 30, 1989 |
| 4829581 |
Electrodynamic transducer comprising a two-part diaphragm |
May. 9, 1989 |
| 4821838 |
Acoustic damper |
Apr. 18, 1989 |
| 4819761 |
Tubular loudspeaker system |
Apr. 11, 1989 |
| 4811402 |
Method and apparatus for reducing acoustical distortion |
Mar. 7, 1989 |
| 4807294 |
Piezoelectric and foam resin sheet speaker |
Feb. 21, 1989 |
| 4797935 |
Speaker system with independently supported top plate |
Jan. 10, 1989 |
| 4750208 |
Audio-band electromechanical vibration converter |
Jun. 7, 1988 |
| 4714133 |
Method and apparatus for augmentation of sound by enhanced resonance |
Dec. 22, 1987 |
| 4694499 |
Directional microphone with acoustic washer |
Sep. 15, 1987 |
| 4675907 |
Electro-vibration transducer |
Jun. 23, 1987 |
| 4654554 |
Piezoelectric vibrating elements and piezoelectric electroacoustic transducers |
Mar. 31, 1987 |
| 4640382 |
Acoustic frictional resistance construction and method of producing an acoustic frictional resistance using a laser |
Feb. 3, 1987 |
| 4638884 |
Chambered headrest mounting for stereophonic loudspeakers |
Jan. 27, 1987 |
| 4637489 |
Electroacoustic transducer |
Jan. 20, 1987 |
| 4619342 |
Multiple sound transducer system utilizing an acoustic filter to reduce distortion |
Oct. 28, 1986 |
| 4598178 |
Means for critically damping a dynamic loudspeaker |
Jul. 1, 1986 |
| 4591672 |
Loud speaker assembly |
May. 27, 1986 |
| 4584702 |
Noise cancelling telephone transmitter insertable in telephone handset receptacle |
Apr. 22, 1986 |
| 4581496 |
Diaphragm for attenuating harmonic response in an electroacoustic transducer |
Apr. 8, 1986 |
| 4569076 |
Motion picture theater loudspeaker system |
Feb. 4, 1986 |
| 4544806 |
Ribbon-type transducer with a multi-layer diaphragm |
Oct. 1, 1985 |
| 4528426 |
Directional microphone assembly |
Jul. 9, 1985 |
| 4525817 |
Acoustic resistor in an electroacoustic transducer |
Jun. 25, 1985 |
| 4517416 |
Electro-acoustic transducer having a diaphragm comprising a layer of polymethacrylimide foam |
May. 14, 1985 |
| 4498555 |
Hearing aid nubbin and acoustic damper |
Feb. 12, 1985 |
| 4488010 |
Loudspeaker |
Dec. 11, 1984 |
| 4453045 |
Supporting arrangement for electroacoustic transducers |
Jun. 5, 1984 |
| 4449236 |
Anti-side tone transmitter |
May. 15, 1984 |
| 4434329 |
Microphone device built in a tape recorder |
Feb. 28, 1984 |
| 4426556 |
Electrodynamic loudspeaker |
Jan. 17, 1984 |
| 4420061 |
Pentagonal speaker enclosure with a downward directed dynamic damping system |
Dec. 13, 1983 |
| 4384173 |
Electromagnetic planar diaphragm transducer |
May. 17, 1983 |
| 4379213 |
Electroacoustical converter |
Apr. 5, 1983 |
| 4355213 |
Microphone assembly |
Oct. 19, 1982 |
| 4346640 |
Decorative light flashing apparatus and acousto-electric transducer therefor |
Aug. 31, 1982 |
| 4322584 |
Voice coil bobbin for planar diaphragm |
Mar. 30, 1982 |
| 4319098 |
Loudspeaker having a unitary mechanical-acoustic diaphragm termination |
Mar. 9, 1982 |
| 4297538 |
Resonant electroacoustic transducer with increased band width response |
Oct. 27, 1981 |
| 4281222 |
Miniaturized unidirectional electret microphone |
Jul. 28, 1981 |
| 4278852 |
Earphone construction |
Jul. 14, 1981 |
| 4276452 |
Membrane type electro-acoustic transducer |
Jun. 30, 1981 |
| 4273968 |
Electroacoustic transducer with magnetic flux directed slantly across a diaphragm |
Jun. 16, 1981 |
| 4246449 |
Electrostatic transducer having optimum sensitivity and damping |
Jan. 20, 1981 |
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