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Class Information
Number: 381/348
Name: Electrical audio signal processing systems and devices > Electro-acoustic audio transducer > Having acoustic wave modifying structure > Acoustic enclosure > Acoustic resistance > On rear side of diaphragm
Description: Subject matter in which an acoustic resistance is placed within a non-primary sound radiation path of a vibrating membrane of a transducer.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7508952 |
Acoustic sound routing in vehicles |
Mar. 24, 2009 |
| 7477755 |
Speaker system |
Jan. 13, 2009 |
| 7450733 |
Speaker with externally mounted acoustic extension |
Nov. 11, 2008 |
| 7447322 |
Speaker having a transparent panel |
Nov. 4, 2008 |
| 7412763 |
Method of making an acoustic assembly for a transducer |
Aug. 19, 2008 |
| 7400910 |
Speaker sound enhancement for a mobile terminal |
Jul. 15, 2008 |
| 7187105 |
Transducer with coupled vibrators |
Mar. 6, 2007 |
| 7155021 |
Loudspeaker having an acoustic panel and an electrical driver |
Dec. 26, 2006 |
| RE39330 |
Speaker system and a method for improving sound quality thereof |
Oct. 10, 2006 |
| 7039212 |
Weather resistant porting |
May. 2, 2006 |
| 6912290 |
Speaker unit for low frequency reproduction |
Jun. 28, 2005 |
| 6859543 |
Speaker system and method for making the same |
Feb. 22, 2005 |
| 6763117 |
Speaker enclosure |
Jul. 13, 2004 |
| 6741717 |
Device for reducing structural-acoustic coupling between the diaphragm vibration field and the enclosure acoustic modes |
May. 25, 2004 |
| 6735320 |
Angled port loudspeaker |
May. 11, 2004 |
| 6561311 |
Speaker cabinet |
May. 13, 2003 |
| 6411720 |
Speaker systems with lower frequency of resonance |
Jun. 25, 2002 |
| 6377696 |
Loudspeaker systems |
Apr. 23, 2002 |
| 6356643 |
Electro-acoustic transducer |
Mar. 12, 2002 |
| 6324292 |
Speaker apparatus |
Nov. 27, 2001 |
| 6320971 |
Speaker system and a method for improving sound quality thereof |
Nov. 20, 2001 |
| 6278789 |
Frequency selective acoustic waveguide damping |
Aug. 21, 2001 |
| 5240221 |
Viscoelastic damping system |
Aug. 31, 1993 |
| 5119429 |
Audio installation, in particular stereophonic, for television sets with a large built-in low-frequency loudspeaker |
Jun. 2, 1992 |
| 5073945 |
Loudspeaker system |
Dec. 17, 1991 |
| 4953655 |
Acoustic apparatus |
Sep. 4, 1990 |
| 4944019 |
Low sound region reproducing speaker system |
Jul. 24, 1990 |
| 4924964 |
Loudspeaker enclosure |
May. 15, 1990 |
| 4898260 |
Loudspeaker mounting with integral back wave filter and wave modulating plate of same design |
Feb. 6, 1990 |
| 4807293 |
Loudspeaker housing |
Feb. 21, 1989 |
| 4574906 |
Outdoor speaker |
Mar. 11, 1986 |
| 4509192 |
Speaker enclosure |
Apr. 2, 1985 |
| 4439644 |
Loud speaker enclosure |
Mar. 27, 1984 |
| 4426552 |
Speaker distortion compensator |
Jan. 17, 1984 |
| 4413160 |
Ribbon-type loudspeaker |
Nov. 1, 1983 |
| 4385210 |
Electro-acoustic planar transducer |
May. 24, 1983 |
| RE31228 |
Loudspeaker system |
May. 3, 1983 |
| 4330691 |
Integral ceiling tile-loudspeaker system |
May. 18, 1982 |
| 4296280 |
Wall mounted speaker system |
Oct. 20, 1981 |
| 4283605 |
Piezoelectric speaker |
Aug. 11, 1981 |
| 4204096 |
Sonic transducer mounting |
May. 20, 1980 |
| 4069401 |
Acoustical frictional resistance construction and apparatus for manufacturing an acoustical resistance and an associated magnetic system |
Jan. 17, 1978 |
| 4027117 |
Headphone |
May. 31, 1977 |
| 4008374 |
Loudspeaker systems |
Feb. 15, 1977 |
| 3944757 |
High-fidelity moving-coil loudspeaker |
Mar. 16, 1976 |
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