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Class Information
Number: 381/71.9
Name: Electrical audio signal processing systems and devices > Acoustical noise or sound cancellation > Counterwave generation control path > Nonacoustically derived reference signal
Description: Subject matter in which a transducer used to obtain a signal for processing detects a form of energy other than sound vibration.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7450725 |
Digital filter modeling for active noise cancellation |
Nov. 11, 2008 |
| 7436968 |
Adaptive noise reduction method and device |
Oct. 14, 2008 |
| 7430255 |
Impulse noise suppression device |
Sep. 30, 2008 |
| 7305094 |
System and method for actively damping boom noise in a vibro-acoustic enclosure |
Dec. 4, 2007 |
| 7231052 |
Vibration-isolating and sound isolating system for vehicle |
Jun. 12, 2007 |
| 7103188 |
Variable gain active noise cancelling system with improved residual noise sensing |
Sep. 5, 2006 |
| 6963647 |
Controlled acoustic waveguide for soundproofing |
Nov. 8, 2005 |
| 6845162 |
Device for active sound control in a space |
Jan. 18, 2005 |
| 6704428 |
Automatic turn-on and turn-off control for battery-powered headsets |
Mar. 9, 2004 |
| 6688422 |
Method and apparatus for actively influencing the intake noise of an internal combustion engine |
Feb. 10, 2004 |
| 6480824 |
Method and apparatus for canceling noise in a microphone communications path using an electrical equivalence reference signal |
Nov. 12, 2002 |
| 6459970 |
Control data setting method and data storage medium of active mount control apparatus |
Oct. 1, 2002 |
| 6278958 |
Method for predicting a noise intensity emitted from a fan and or a pump |
Aug. 21, 2001 |
| 6266422 |
Noise canceling method and apparatus for the same |
Jul. 24, 2001 |
| 6188770 |
Fan noise canceller |
Feb. 13, 2001 |
| 6002778 |
Active structural control system and method including active vibration absorbers (AVAS) |
Dec. 14, 1999 |
| 5995632 |
Fan noise canceller |
Nov. 30, 1999 |
| 5930372 |
Communication terminal device |
Jul. 27, 1999 |
| 5690321 |
Vibration damping system for vehicle |
Nov. 25, 1997 |
| 5691893 |
Adaptive control system |
Nov. 25, 1997 |
| 5692052 |
Engine noise control apparatus |
Nov. 25, 1997 |
| 5636287 |
Apparatus and method for the active control of air moving device noise |
Jun. 3, 1997 |
| 5613009 |
Method and apparatus for controlling vibration |
Mar. 18, 1997 |
| 5548652 |
Silencing apparatus |
Aug. 20, 1996 |
| 5544080 |
Vibration/noise control system |
Aug. 6, 1996 |
| 5530766 |
Noise reducing apparatus of a cyclo-fan |
Jun. 25, 1996 |
| 5511127 |
Active noise control |
Apr. 23, 1996 |
| 5502770 |
Indirectly sensed signal processing in active periodic acoustic noise cancellation |
Mar. 26, 1996 |
| 5493616 |
Vehicle internal noise reduction system |
Feb. 20, 1996 |
| 5488667 |
Vehicle internal noise reduction system |
Jan. 30, 1996 |
| 5488666 |
System for suppressing sound from a flame |
Jan. 30, 1996 |
| 5485523 |
Active noise reduction system for automobile compartment |
Jan. 16, 1996 |
| 5473699 |
Vehicle internal noise reduction system |
Dec. 5, 1995 |
| 5455779 |
Noise reduction apparatus |
Oct. 3, 1995 |
| 5446790 |
Intake sound control apparatus |
Aug. 29, 1995 |
| 5427102 |
Active noise cancellation apparatus in MRI apparatus |
Jun. 27, 1995 |
| 5426705 |
Vehicle internal noise reduction system |
Jun. 20, 1995 |
| 5426704 |
Noise reducing apparatus |
Jun. 20, 1995 |
| 5423658 |
Active noise control using noise source having adaptive resonant frequency tuning through variable ring loading |
Jun. 13, 1995 |
| 5416844 |
Apparatus for reducing noise in space applicable to vehicle passenger compartment |
May. 16, 1995 |
| 5415522 |
Active noise control using noise source having adaptive resonant frequency tuning through stress variation |
May. 16, 1995 |
| 5414230 |
Silencer arrangement for combustion engines |
May. 9, 1995 |
| 5408532 |
Vehicle internal noise reduction system |
Apr. 18, 1995 |
| 5394376 |
Method and apparatus for acoustic attenuation |
Feb. 28, 1995 |
| 5391053 |
Active noise control using noise source having adaptive resonant frequency tuning through variable panel loading |
Feb. 21, 1995 |
| 5382134 |
Active noise control using noise source having adaptive resonant frequency tuning through stiffness variation |
Jan. 17, 1995 |
| 5361303 |
Frequency domain adaptive control system |
Nov. 1, 1994 |
| 5325437 |
Apparatus for reducing noise in space applicable to vehicle compartment |
Jun. 28, 1994 |
| 5321759 |
Active noise control system for attenuating engine generated noise |
Jun. 14, 1994 |
| 5313945 |
Active attenuation system for medical patients |
May. 24, 1994 |
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