Method and apparatus for reducing impulse noise in a signal...

Electrical audio signal processing systems and devices – Noise or distortion suppression – Using signal channel and noise channel

Reexamination Certificate

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

Reexamination Certificate

active

06944304

ABSTRACT:
An observed signal that is corrupted with impulse noise is recorded in a signal processing system of an image processing system or a digital subscriber line (xDSL). The observed signal that is recorded by the signal processing system includes a noise component and data component. The signal processing system estimates the parameters of an alpha-stable distribution using a modified iteratively reweighted least squares (IRLS) technique. The estimated parameters define a probability density function that is used to model the noise component of the observed signal. Once the parameters of the alpha-stable distribution are estimated, the signal processing system uses them to estimate model coefficients of a non-linear prediction filter such as a Volterra filter. Using the model coefficients, the non-linear prediction filter estimates the data component of the observed signal.

REFERENCES:
patent: 5960036 (1999-09-01), Johnson et al.
patent: 6072782 (2000-06-01), Wu
Kuruoglu, Ercan E. “Impulse Noise Elimination Using Polynomial Iteratively Reweighted Least Squares”. 1996, IEEE, pp. 347-350.
Kuruoglu, Ercan E. “Least Lp-norm Estimation of Autoregressive Model Coefficents of Symettric alpha-stable Processes”, Jul. 1997, IEEE, pp. 201-203.
Ma, Xinya. “Parameter Estimation and Blind Channel Identification in Impulsive Signal Environments”, Dec. 1995, pp. 2884-2897.
Applicant's admitted prior art , Background of the Invention, p. 2, line 20-p. 3,line 9.
Kuruoglu, Ercan E. et al., “Near Optimal Detection Of Signals In Impulsive Noise Modeled With A Symmetric Alpha-Stable Distribution”, published in IEEE Communications Letters, vol. 2, No. 10, pp. 282-284, Oct. 1998.
Barton, Melbourne, “Impulse Noise Performance of an Asymmetric Digital Subscriber Lines Passband Transmission System,” IEEE Transactions on Communications, vol. 43, No. 2/3/4, Feb./Mar./Apr. 1995, pp. 1337-1340.
Henkel, Werner et al., “Coded 64-CAP ADSL in an Impulse-Noise Environment—Modeling of Impulse Noise and First Simulation Results,” IEEE Journal on Selected Areas in Communications, vol. 13, No. 9, Dec. 1995, pp. 1611-1621.
Kerpez, Kenneth J. et al., “The Error Performance of Digital Subscriber Lines in the Presence of Impulse Noise,” IEEE Transactions on Communications, vol. 43, No. 5, May 1995, pp. 1902-1905.
Kogon, Stephen M. et al., “On the Characterization of Impulsive Noise with α-Stable Distributions Using Fourier Techniques,” IEEE Proceedings of ASILOMAR-29, 1996, pp. 787-791.
Kuruoglu, Ercan E. et al., “Impulsive Noise Elimination Using Polynomial Iteratively Reweighted Least Squares,” Proceedings 1996 IEEE Digital Signal Processing Workshop Proceedings, Sep. 1-4, 1996, Loen, Norway, pp. 347-350.
Kuruoglu, Ercan E. et al., “Least Lp-Norm Estimation of Autoregressive Model Coefficients of Symmetric α-Stable Processes,” IEEE Signal Processing Letters, vol. 4, No. 7, Jul. 1997, pp. 201-203.
Kuruoglu, Ercan E. et al., “Least Lp-Norm Impulsive Noise Cancellation with Polynomial Filters,” Signal Processing, vol. 69, No. 1, Aug. 1998, pp. 1-14.
Kuruoglu, Ercan E. et al., “A Near Optimal Receiver for Detection in α-Stable Distributed Noise,” Proceedings of 1998 IEEE Statistical Signal and Array Processing Workshop, Portland, Oregon, USA, Sep. 14-16, 1998 (also published in IEEE Communications Letters, vol. 2, No. 10, pp. 282-284, Oct. 1998).
Ma, Xinyu et al., “Parameter Estimation and Blind Channel Identification in Impulsive Signal Environments,” IEEE Transactions on Signal Processing, vol. 43, No. 12, Dec. 1995, pp. 2884-2897.
McCulloch, J. Huston, “Simple Consistent Estimators of Stable Distribution Parameters,” Communications in Statistics-Simulation and Computation, vol. 75, 1986, pp. 1109-1136.
Nolan, John P., “Maximum Likelihood Estimation and Diagnostics for Stable Distributions,” available from http://www.cas.american.edu/˜jpnolan/stable.html, 1998.
Tsihrintzis, George A. et al, “Fast Estimation of the Parameters of Alpha-Stable Impulsive Interference,” IEEE Transactions on Signal Processing, vol. 44, No. 6, Jun. 1996, pp. 1492-1503.
Zolotarev, V. M., “Mellin-Stieltjes Transforms in Probability Theory,” Theory of Probability and Its Applications, vol. 2, No. 4, 1957, pp. 433-459.
Ilow, Jacek et al. “Detection in Alpha-Stable Noise Environments Based on Prediction,” International Journal of Adaptive Control and Signal Processing, vol. 11, No. 7, Nov. 1997, pp. 555-568.
Kim, Hyun Mun et al. “Fuzzy Prediction and Filtering in Impulsive Noise,” Fuzzy Sets & Systems, vol. 77, No. 1, Jan. 1996, pp. 15-33.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Method and apparatus for reducing impulse noise in a signal... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method and apparatus for reducing impulse noise in a signal..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for reducing impulse noise in a signal... will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-3392713

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.