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Class Information
Number: 381/339
Name: Electrical audio signal processing systems and devices > Electro-acoustic audio transducer > Having acoustic wave modifying structure > Sound intensifying or spreading element
Description: Subject matter wherein a) the amplitude of a sound wave is increased, or b) wherein the sound from the transducer is widely dispersed.










Sub-classes under this class:

Class Number Class Name Patents
381/340 Horn 172
381/344 Mouthpiece 29


Patents under this class:
1 2

Patent Number Title Of Patent Date Issued
8615097 Waveguide electroacoustical transducing Dec. 24, 2013
8511422 Flexible multiple speaker support apparatus Aug. 20, 2013
8509468 Apparatus for outputting sound comprising multiple receivers and a common output channel Aug. 13, 2013
8488826 Horn enclosure for combining sound output Jul. 16, 2013
8483420 Docking station having structure for sound amplification and sound quality enhancement Jul. 9, 2013
8477979 Compression driver and horn structure Jul. 2, 2013
8447055 Passive directional acoustic radiating May. 21, 2013
8422712 Horn-loaded acoustic source with custom amplitude distribution Apr. 16, 2013
8401216 Acoustic traveling wave tube system and method for forming and propagating acoustic waves Mar. 19, 2013
8351629 Waveguide electroacoustical transducing Jan. 8, 2013
8320597 Acoustic dock for portable electronic device Nov. 27, 2012
8284976 Sound reproduction with improved performance characteristics Oct. 9, 2012
8254615 Loudspeaker with acoustic speaker lens Aug. 28, 2012
8249268 Woofer-less and enclosure-less loudspeaker system Aug. 21, 2012
8194904 Speaker system with broad directivity Jun. 5, 2012
8191674 Acoustic loading device for loudspeakers Jun. 5, 2012
8180074 Display device and speaker system for the display device May. 15, 2012
8175316 Ear speaker device May. 8, 2012
8150094 Electroacoustic transducer Apr. 3, 2012
8130994 Waveguide Mar. 6, 2012
8103036 Speaker device and television receiver using the speaker device Jan. 24, 2012
8090131 Steerable acoustic waveguide Jan. 3, 2012
8054995 System, method and apparatus for adjusting an output of a transducer Nov. 8, 2011
8036403 Directional sound wave radiator Oct. 11, 2011
7953238 Multiple aperture diffraction device May. 31, 2011
7912234 Acoustic projector for propagating a low dispersion sound field Mar. 22, 2011
7886867 Flexible multiple speaker support apparatus Feb. 15, 2011
7751581 Public address system with adjustable directivity Jul. 6, 2010
7684582 Electrodynamic acoustic transducer Mar. 23, 2010
7590257 Axially propagating horn array for a loudspeaker Sep. 15, 2009
7565178 Portable handset with integrated speaker Jul. 21, 2009
7558395 Loudspeaker Jul. 7, 2009
7510049 Acoustic transformer and method for transforming sound waves Mar. 31, 2009
7506721 Convertible folded horn enclosure Mar. 24, 2009
7466837 Diffuser and speaker using the same Dec. 16, 2008
7426281 Electrodynamic acoustic transducer Sep. 16, 2008
7426278 Sound device provided with a geometric and electronic radiation control Sep. 16, 2008
7409071 Large-diameter arcuate speaker Aug. 5, 2008
7275621 Skew horn for a loudspeaker Oct. 2, 2007
7252176 Reflex-ported folded horn enclosure Aug. 7, 2007
7178629 Electroacoustic public address unit with acoustic horn or waveguide Feb. 20, 2007
7177437 Multiple aperture diffraction device Feb. 13, 2007
7167415 Transducers for focusing sonic energy in transmitting and receiving device Jan. 23, 2007
7134523 System for integrating mid-range and high-frequency acoustic sources in multi-way loudspeakers Nov. 14, 2006
7095868 Phase plug with optimum aperture shapes Aug. 22, 2006
7044265 Constant directivity acoustic horn May. 16, 2006
7039211 Horn-loaded compression driver system May. 2, 2006
7013019 Thermoset composite material baffle for loudspeaker Mar. 14, 2006
7010138 Loudspeakers Mar. 7, 2006
6798888 Mount for underwater acoustic projector Sep. 28, 2004

1 2










 
 
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