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Class Information
Number: 381/71.11
Name: Electrical audio signal processing systems and devices > Acoustical noise or sound cancellation > Counterwave generation control path > Adaptive filter topology
Description: Subject matter having the functional interconnections between two or more transfer function models which make up an overall circuit or computational arrangement designed to generate a counterwave.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7577262 |
Microphone device and audio player |
Aug. 18, 2009 |
| 7574006 |
Active noise controller |
Aug. 11, 2009 |
| 7545859 |
Adaptive channel equalization technique and method for wideband passive digital receivers |
Jun. 9, 2009 |
| 7536018 |
Active noise cancellation system |
May. 19, 2009 |
| 7480377 |
Dual adaptive filter apparatus and method |
Jan. 20, 2009 |
| 7457422 |
Method and implementation for detecting and characterizing audible transients in noise |
Nov. 25, 2008 |
| 7436968 |
Adaptive noise reduction method and device |
Oct. 14, 2008 |
| 7386135 |
Cardioid beam with a desired null based acoustic devices, systems and methods |
Jun. 10, 2008 |
| 7352869 |
Apparatus for and method of actively controlling vibratory noise, and vehicle with active vibratory noise control apparatus |
Apr. 1, 2008 |
| 7343016 |
Linear independence method for noninvasive on-line system identification/secondary path modeling for filtered-X LMS-based active noise control systems |
Mar. 11, 2008 |
| 7340064 |
Active noise control system |
Mar. 4, 2008 |
| 7340065 |
Active noise control system |
Mar. 4, 2008 |
| 7340063 |
Feedback cancellation with low frequency input |
Mar. 4, 2008 |
| 7310425 |
Multi-channel frequency-domain adaptive filter method and apparatus |
Dec. 18, 2007 |
| 7272234 |
Multi-channel active control system and method for the reduction of tonal noise from an axial fan |
Sep. 18, 2007 |
| 7248703 |
Systems and methods for adaptive noise cancellation |
Jul. 24, 2007 |
| 7239660 |
Adaptive filter with GSPT LMS algorithm for reducing complexity |
Jul. 3, 2007 |
| 7197146 |
Microphone array signal enhancement |
Mar. 27, 2007 |
| 7155018 |
System and method facilitating acoustic echo cancellation convergence detection |
Dec. 26, 2006 |
| 7120259 |
Adaptive estimation and compensation of clock drift in acoustic echo cancellers |
Oct. 10, 2006 |
| 7117128 |
Method and apparatus for digital signal filtering |
Oct. 3, 2006 |
| 7106866 |
Active noise cancellation stability solution |
Sep. 12, 2006 |
| 7092532 |
Adaptive feedback canceller |
Aug. 15, 2006 |
| 7092529 |
Adaptive control system for noise cancellation |
Aug. 15, 2006 |
| 6999541 |
Signal processing apparatus and method |
Feb. 14, 2006 |
| 6996241 |
Tuned feedforward LMS filter with feedback control |
Feb. 7, 2006 |
| 6959092 |
Noise reduction panel arrangement and method of calibrating such a panel arrangement |
Oct. 25, 2005 |
| 6928171 |
Circuit and method for the adaptive suppression of noise |
Aug. 9, 2005 |
| 6898293 |
Hearing aid |
May. 24, 2005 |
| 6847723 |
Voice input apparatus |
Jan. 25, 2005 |
| 6847721 |
Active noise control system with on-line secondary path modeling |
Jan. 25, 2005 |
| 6845162 |
Device for active sound control in a space |
Jan. 18, 2005 |
| 6804359 |
Signal processor for reducing undesirable signal content |
Oct. 12, 2004 |
| 6795551 |
Circuit for removing in-band FSK signals without muting of receiver |
Sep. 21, 2004 |
| 6788785 |
Stable adaptive filter and method |
Sep. 7, 2004 |
| 6778601 |
Adaptive audio equalizer apparatus and method of determining filter coefficient |
Aug. 17, 2004 |
| 6754340 |
Stable adaptive filter and method |
Jun. 22, 2004 |
| 6744886 |
Adaptive filter utilizing proportional affine projection algorithm |
Jun. 1, 2004 |
| 6741707 |
Method for tuning an adaptive leaky LMS filter |
May. 25, 2004 |
| 6735304 |
Adaptive filter and echo canceller using the same |
May. 11, 2004 |
| 6728380 |
Adaptive noise suppression system and method |
Apr. 27, 2004 |
| 6683960 |
Active noise control apparatus |
Jan. 27, 2004 |
| 6665410 |
Adaptive feedback controller with open-loop transfer function reference suited for applications such as active noise control |
Dec. 16, 2003 |
| 6650756 |
Method and apparatus for characterizing audio transmitting system, and method and apparatus for setting characteristics of audio filter |
Nov. 18, 2003 |
| 6625285 |
Acoustic cooling system with noise reduction function |
Sep. 23, 2003 |
| 6549627 |
Generating calibration signals for an adaptive beamformer |
Apr. 15, 2003 |
| 6498858 |
Feedback cancellation improvements |
Dec. 24, 2002 |
| 6487295 |
Adaptive filtering system and method |
Nov. 26, 2002 |
| 6459970 |
Control data setting method and data storage medium of active mount control apparatus |
Oct. 1, 2002 |
| 6434247 |
Feedback cancellation apparatus and methods utilizing adaptive reference filter mechanisms |
Aug. 13, 2002 |
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