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Class Information
Number: 381/71.7
Name: Electrical audio signal processing systems and devices > Acoustical noise or sound cancellation > Particular transducer or enclosure structure
Description: Subject matter specifying details of an electro-acoustic energy converter or housing for use in an active noise cancellation system.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7613532 |
Systems and methods for improving the signal to noise ratio for audio input in a computing system |
Nov. 3, 2009 |
| 7539459 |
Active noise cancellation system, arrangement, and method |
May. 26, 2009 |
| 7533759 |
Active muffler for an exhaust system |
May. 19, 2009 |
| 7499555 |
Personal communication method and apparatus with acoustic stray field cancellation |
Mar. 3, 2009 |
| 7366309 |
Robot |
Apr. 29, 2008 |
| 7352870 |
Active sound muffler and active sound muffling method |
Apr. 1, 2008 |
| 7327849 |
Energy density control system using a two-dimensional energy density sensor |
Feb. 5, 2008 |
| 7315619 |
System and method for enhanced subjective stereo audio |
Jan. 1, 2008 |
| 7293627 |
Active exhaust muffler |
Nov. 13, 2007 |
| 7272234 |
Multi-channel active control system and method for the reduction of tonal noise from an axial fan |
Sep. 18, 2007 |
| 7248704 |
Active sound attenuation device to be arranged inside a duct, particularly for the sound insulation of a ventilating and/or air conditioning system |
Jul. 24, 2007 |
| 7245726 |
Noise canceling microphone system and method for designing the same |
Jul. 17, 2007 |
| 7209796 |
Auscultatory training system |
Apr. 24, 2007 |
| 7162041 |
Noise canceling microphone with acoustically tuned ports |
Jan. 9, 2007 |
| 7139401 |
Hard disk drive with self-contained active acoustic noise reduction |
Nov. 21, 2006 |
| 7110551 |
Adaptive personal active noise reduction system |
Sep. 19, 2006 |
| 7068794 |
Smart panel for decreasing noise in wide band frequency |
Jun. 27, 2006 |
| 7043029 |
Device for use in an audio signal processing system |
May. 9, 2006 |
| 6996242 |
Integrated and active noise control inlet |
Feb. 7, 2006 |
| 6963648 |
Echo/noise canceling device for use with personal computers |
Nov. 8, 2005 |
| 6898290 |
Adaptive personal active noise reduction system |
May. 24, 2005 |
| 6847722 |
Method and equipment for attenuating sound in a duct |
Jan. 25, 2005 |
| 6839439 |
Method and apparatus for active noise control in an air induction system |
Jan. 4, 2005 |
| 6792324 |
Device for determining and characterizing noises generated by mastication of food |
Sep. 14, 2004 |
| 6702061 |
Environmentally protected microphone for an active noise control system |
Mar. 9, 2004 |
| 6560342 |
Smart foam for active noise control in a duct and device equipped with the same |
May. 6, 2003 |
| 6483926 |
Floor impact noise suppressor in a multi-storied building |
Nov. 19, 2002 |
| 6438240 |
Circuit to improve transducer separation in handsfree telephone |
Aug. 20, 2002 |
| 6434246 |
Apparatus and methods for combining audio compression and feedback cancellation in a hearing aid |
Aug. 13, 2002 |
| 6385321 |
Reactive sound absorber |
May. 7, 2002 |
| 6351541 |
Electrostatic transducer |
Feb. 26, 2002 |
| 6343127 |
Active noise control system for closed spaces such as aircraft cabin |
Jan. 29, 2002 |
| 6327368 |
Configuration of providing microphone in duct and active noise reduction device using same |
Dec. 4, 2001 |
| 6201872 |
Active control source cancellation and active control Helmholtz resonator absorption of axial fan rotor-stator interaction noise |
Mar. 13, 2001 |
| 6167371 |
Speech filter for digital electronic communications |
Dec. 26, 2000 |
| 6084971 |
Active noise attenuation system |
Jul. 4, 2000 |
| 6078674 |
Mass injection for reducing flow-induced resonance in a cavity |
Jun. 20, 2000 |
| 6078672 |
Adaptive personal active noise system |
Jun. 20, 2000 |
| 6078673 |
Apparatus and method for active control of sound transmission through aircraft fuselage walls |
Jun. 20, 2000 |
| 6061456 |
Noise cancellation apparatus |
May. 9, 2000 |
| 6031917 |
Active noise control using blocked mode approach |
Feb. 29, 2000 |
| 6018689 |
Active vibration reducing apparatus and method for identifying transfer function in active vibration reducing apparatus |
Jan. 25, 2000 |
| 6009180 |
Fluidic element noise and vibration control constructs and methods |
Dec. 28, 1999 |
| 6005957 |
Loudspeaker pressure plate |
Dec. 21, 1999 |
| 5987144 |
Personal active noise cancellation method and device having invariant impulse response |
Nov. 16, 1999 |
| 5979593 |
Hybrid mode-scattering/sound-absorbing segmented liner system and method |
Nov. 9, 1999 |
| 5949897 |
Sound reproduction device with active noise compensation |
Sep. 7, 1999 |
| 5930371 |
Tunable acoustic system |
Jul. 27, 1999 |
| 5862234 |
Active noise cancellation system |
Jan. 19, 1999 |
| 5848168 |
Active noise conditioning system |
Dec. 8, 1998 |
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