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Class Information
Number: 381/94.7
Name: Electrical audio signal processing systems and devices > Noise or distortion suppression > Using signal channel and noise channel
Description: Subject matter having separate inputs, each respectively containing primarily the desired and undesired signals, and which derives at least one "clean" output having the desired signal by utilizing both inputs, such as by subtracting one input from the other.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7613310 |
Audio input system |
Nov. 3, 2009 |
| 7577262 |
Microphone device and audio player |
Aug. 18, 2009 |
| 7574008 |
Method and apparatus for multi-sensory speech enhancement |
Aug. 11, 2009 |
| 7574007 |
Stimulus analysis system and method having adaptive artifact rejection |
Aug. 11, 2009 |
| 7519186 |
Noise reduction systems and methods for voice applications |
Apr. 14, 2009 |
| 7489789 |
Method for noise reduction in an audio device and hearing aid with means for reducing noise |
Feb. 10, 2009 |
| 7486797 |
Audio correcting apparatus |
Feb. 3, 2009 |
| 7474756 |
System and method for non-square blind source separation under coherent noise by beamforming and time-frequency masking |
Jan. 6, 2009 |
| 7392177 |
Method and system for reducing a voice signal noise |
Jun. 24, 2008 |
| 7386135 |
Cardioid beam with a desired null based acoustic devices, systems and methods |
Jun. 10, 2008 |
| 7382887 |
Method and device for reducing high frequency error components of a multi-channel modulator |
Jun. 3, 2008 |
| 7366658 |
Noise pre-processor for enhanced variable rate speech codec |
Apr. 29, 2008 |
| 7359520 |
Directional audio signal processing using an oversampled filterbank |
Apr. 15, 2008 |
| 7359522 |
Coding of stereo signals |
Apr. 15, 2008 |
| 7327852 |
Method and device for separating acoustic signals |
Feb. 5, 2008 |
| 7317801 |
Active acoustic noise reduction system |
Jan. 8, 2008 |
| 7302066 |
Method for eliminating an unwanted signal from a mixture via time-frequency masking |
Nov. 27, 2007 |
| 7289586 |
Signal processing apparatus and method |
Oct. 30, 2007 |
| 7254242 |
Acoustic signal processing apparatus and method, and audio device |
Aug. 7, 2007 |
| 7248708 |
Noise canceling microphone |
Jul. 24, 2007 |
| 7245726 |
Noise canceling microphone system and method for designing the same |
Jul. 17, 2007 |
| 7206418 |
Noise suppression for a wireless communication device |
Apr. 17, 2007 |
| 7174023 |
Automatic wind noise reduction circuit and automatic wind noise reduction method |
Feb. 6, 2007 |
| 7110554 |
Sub-band adaptive signal processing in an oversampled filterbank |
Sep. 19, 2006 |
| 7107209 |
Speech communication apparatus with gain control for clear communication |
Sep. 12, 2006 |
| 7088832 |
IFB system apparatus and method |
Aug. 8, 2006 |
| 7068797 |
Microphone circuits having adjustable directivity patterns for reducing loudspeaker feedback and methods of operating the same |
Jun. 27, 2006 |
| 7049968 |
Baby monitor with a soothing unit |
May. 23, 2006 |
| 7043427 |
Apparatus and method for speech recognition |
May. 9, 2006 |
| 7035417 |
System for reducing noise in the reproduction of recorded sound signals |
Apr. 25, 2006 |
| 7024005 |
Method and apparatus for reducing impulse noise in a signal processing system |
Apr. 4, 2006 |
| 7024006 |
Complementary-pair equalizer |
Apr. 4, 2006 |
| 7020294 |
Method for active noise cancellation using independent component analysis |
Mar. 28, 2006 |
| 7020291 |
Noise reduction method with self-controlling interference frequency |
Mar. 28, 2006 |
| 6999541 |
Signal processing apparatus and method |
Feb. 14, 2006 |
| 6963649 |
Noise cancelling microphone |
Nov. 8, 2005 |
| 6944304 |
Method and apparatus for reducing impulse noise in a signal processing system |
Sep. 13, 2005 |
| 6917688 |
Adaptive noise cancelling microphone system |
Jul. 12, 2005 |
| 6901363 |
Method of denoising signal mixtures |
May. 31, 2005 |
| 6895095 |
Method of eliminating interference in a microphone |
May. 17, 2005 |
| 6847723 |
Voice input apparatus |
Jan. 25, 2005 |
| 6795713 |
Portable telephone with attenuation for surrounding noise |
Sep. 21, 2004 |
| 6759961 |
Two-way communication baby monitor with a soothing unit |
Jul. 6, 2004 |
| 6738482 |
Noise suppression system with dual microphone echo cancellation |
May. 18, 2004 |
| 6639986 |
Built-in microphone device |
Oct. 28, 2003 |
| 6549630 |
Signal expander with discrimination between close and distant acoustic source |
Apr. 15, 2003 |
| 6529605 |
Method and apparatus for dynamic sound optimization |
Mar. 4, 2003 |
| 6529606 |
Method and system for reducing undesired signals in a communication environment |
Mar. 4, 2003 |
| 6526148 |
Device and method for demixing signal mixtures using fast blind source separation technique based on delay and attenuation compensation, and for selecting channels for the demixed signals |
Feb. 25, 2003 |
| 6487295 |
Adaptive filtering system and method |
Nov. 26, 2002 |
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