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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:
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Patent Number Title Of Patent Date Issued
8582794 Speaker with acoustic damped port Nov. 12, 2013
8515101 Bending vibration type sound transmitter Aug. 20, 2013
8509459 Noise cancelling microphone with reduced acoustic leakage Aug. 13, 2013
8467549 Audio information processing apparatus and audio information processing method Jun. 18, 2013
8275164 Speaker enclosures Sep. 25, 2012
8189840 Loudspeaker and electronic devices incorporating same May. 29, 2012
8144906 Wind immune microphone Mar. 27, 2012
8135149 Wireless communication device Mar. 13, 2012
8094842 Loudspeaker system and loudspeaker enclosure Jan. 10, 2012
8041064 Card type MEMS microphone Oct. 18, 2011
7953239 High output sub-woofer May. 31, 2011
7899201 Speaker with acoustic damped port Mar. 1, 2011
7801320 Sound sponge for loudspeakers Sep. 21, 2010
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

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