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Class Information
Number: 381/94.2
Name: Electrical audio signal processing systems and devices > Noise or distortion suppression > Spectral adjustment
Description: Subject matter in which the unwanted signal is either at least partially removed by processing a selected frequency or frequency band, such as by subtracting the contents of a particular frequency band from the input signal, or is overcome by preemphasis of a particular frequency or band to enhance the signal to noise ratio.
Sub-classes under this class:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7613310 |
Audio input system |
Nov. 3, 2009 |
| 7609841 |
Frequency shifter for use in adaptive feedback cancellers for hearing aids |
Oct. 27, 2009 |
| 7602926 |
Stationary spectral power dependent audio enhancement system |
Oct. 13, 2009 |
| 7596231 |
Reducing noise in an audio signal |
Sep. 29, 2009 |
| 7567548 |
Method to reduce the distortion in a voice transmission over data networks |
Jul. 28, 2009 |
| 7562013 |
Method for recovering target speech based on amplitude distributions of separated signals |
Jul. 14, 2009 |
| 7561702 |
Method and system for the pre-processing and post processing of an audio signal for transmission on a highly disturbed channel |
Jul. 14, 2009 |
| 7542577 |
Input sound processor |
Jun. 2, 2009 |
| 7515703 |
Method and system for determining conference call embellishment tones and transmission of same |
Apr. 7, 2009 |
| 7508948 |
Reverberation removal |
Mar. 24, 2009 |
| 7489789 |
Method for noise reduction in an audio device and hearing aid with means for reducing noise |
Feb. 10, 2009 |
| 7480614 |
Energy feature extraction method for noisy speech recognition |
Jan. 20, 2009 |
| 7400735 |
Wave-filtering device with an adjustable frequency bandwidth |
Jul. 15, 2008 |
| 7359521 |
Aliasing cancellation in audio effects algorithms |
Apr. 15, 2008 |
| 7340068 |
Device and method for detecting wind noise |
Mar. 4, 2008 |
| 7333619 |
Fast wavelet estimation of weak bio-signals using novel algorithms for generating multiple additional data frames |
Feb. 19, 2008 |
| 7305099 |
Electronic devices, methods, and computer program products for detecting noise in a signal based on autocorrelation coefficient gradients |
Dec. 4, 2007 |
| 7302065 |
Noise suppressor |
Nov. 27, 2007 |
| 7302064 |
Fast estimation of weak bio-signals using novel algorithms for generating multiple additional data frames |
Nov. 27, 2007 |
| 7302066 |
Method for eliminating an unwanted signal from a mixture via time-frequency masking |
Nov. 27, 2007 |
| 7277550 |
Enhancing audio signals by nonlinear spectral operations |
Oct. 2, 2007 |
| 7254242 |
Acoustic signal processing apparatus and method, and audio device |
Aug. 7, 2007 |
| 7209796 |
Auscultatory training system |
Apr. 24, 2007 |
| 7205910 |
Signal encoding apparatus and signal encoding method, and signal decoding apparatus and signal decoding method |
Apr. 17, 2007 |
| 7203326 |
Noise suppressing apparatus |
Apr. 10, 2007 |
| 7190775 |
High quality audio conferencing with adaptive beamforming |
Mar. 13, 2007 |
| 7190800 |
Howling control device and howling control method |
Mar. 13, 2007 |
| 7174023 |
Automatic wind noise reduction circuit and automatic wind noise reduction method |
Feb. 6, 2007 |
| 7174022 |
Small array microphone for beam-forming and noise suppression |
Feb. 6, 2007 |
| 7162045 |
Sound processing method and apparatus |
Jan. 9, 2007 |
| 7158932 |
Noise suppression apparatus |
Jan. 2, 2007 |
| 7127072 |
Method and apparatus for reducing random, continuous non-stationary noise in audio signals |
Oct. 24, 2006 |
| 7113606 |
Adjustable harmonic distortion detector and method for using the same |
Sep. 26, 2006 |
| 7110554 |
Sub-band adaptive signal processing in an oversampled filterbank |
Sep. 19, 2006 |
| 7110722 |
Method for extracting a signal |
Sep. 19, 2006 |
| 7103541 |
Microphone array signal enhancement using mixture models |
Sep. 5, 2006 |
| 7092537 |
Digital self-adapting graphic equalizer and method |
Aug. 15, 2006 |
| 7054454 |
Fast wavelet estimation of weak bio-signals using novel algorithms for generating multiple additional data frames |
May. 30, 2006 |
| 7054453 |
Fast estimation of weak bio-signals using novel algorithms for generating multiple additional data frames |
May. 30, 2006 |
| 7047189 |
Sound source separation using convolutional mixing and a priori sound source knowledge |
May. 16, 2006 |
| 7043030 |
Noise suppression device |
May. 9, 2006 |
| 6990446 |
Method and apparatus using spectral addition for speaker recognition |
Jan. 24, 2006 |
| 6952482 |
Method and apparatus for noise filtering |
Oct. 4, 2005 |
| 6903528 |
Machine model estimating device of electric motor control apparatus |
Jun. 7, 2005 |
| 6879952 |
Sound source separation using convolutional mixing and a priori sound source knowledge |
Apr. 12, 2005 |
| 6868378 |
Process for voice recognition in a noisy acoustic signal and system implementing this process |
Mar. 15, 2005 |
| 6859540 |
Noise reduction system for an audio system |
Feb. 22, 2005 |
| 6810124 |
Adaptive resonance canceller apparatus |
Oct. 26, 2004 |
| 6804359 |
Signal processor for reducing undesirable signal content |
Oct. 12, 2004 |
| 6754355 |
Digital hearing device, method and system |
Jun. 22, 2004 |
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