Subtractive cancellation of harmonic noise

Details Subtractive cancellation of harmonic noise Subtractive cancellation of harmonic noise

2005-05-25

2008-11-18

Pathak, Sudhanshu C (Department: 2611)

Pulse or digital communications

Receivers

Interference or noise reduction

C375S227000, C375S254000, C704S224000, C704S228000, C702S075000, C702S189000, C701S022000

Reexamination Certificate

active

07453963

ABSTRACT:
A common problem in audio processing is that a useful signal is disturbed by one or more sinusoidal noises that should be suppressed. One embodiment of the invention provides a method of canceling a sinusoidal disturbance of unknown frequency in a disturbed useful signal. The method comprises the steps of estimating parameters of the sinusoidal disturbance including amplitude, phase and frequency; generating a reference signal on the basis of the estimated parameters; and subtracting the reference signal from the disturbed useful signal. According to one embodiment of the present invention, the estimation is performed by an Extended Kalman filter.

REFERENCES:
patent: 4677668 (1987-06-01), Ardalan et al.
patent: 6006082 (1999-12-01), Park et al.
patent: 7162165 (2007-01-01), Szafraniec
patent: 2004/0022547 (2004-02-01), Szafraniec
patent: 2004/0118231 (2004-06-01), Peck
patent: 2005/0125114 (2005-06-01), Atmur
Ephraim, Y. et al., “Speech Enhancement Using a Minimum Mean-Square Error Short-Time Spectral Amplitude Estimator,” IEEE Transactions on Acoustics, Speech, and Signal Processing, Dec. 1984, pp. 1109-1121, vol. ASSP-32, No. 6.
European Search Report, EP 04 02 4861, Nov. 8, 2005, 3 pages.
La Scala, B.F. et al., “Design of an Extended Kalman Filter Frequency Tracker,” IEEE Transactions on Signal Processing, Mar. 1996, pp. 739-742, vol. 44, No. 3.
Parker, P. et al., “Frequency Tracking of Nonsinusoidal Periodic Signals in Noise,” Elsevier Science Publishers B.V., 1990, pp. 127-152.
Pfitzinger, H.R., “Removing Hum from Spoken Language Resources,” Department of Phonetics and Speech Communication, University of Munich, 4 pages.
Puder, H., “Speech Enhancement for Hands-Free Car Phones by Adaptive Compensation of Harmonic Engine Noise Components,” Eurospeech 2003—Geneva, pp. 1397-1400.
Woolfson, M.S. et al., “Adaptive Cancellation of Selected Harmonics from a Signal,” IEE Proc.-Vis. Image Signal Process., Aug. 2001, pp. 295-303, vol. 148, No. 4.
“Voice Activity Detection (VAD) for Full Rate Speech Traffic Channels,” European Telecommunications Standard Institute, ETSI, GSM 06.32, 1998, pp. 1-41.

Affiliated with

Also associated with

Rating

Subtractive cancellation of harmonic noise does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Subtractive cancellation of harmonic noise, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Subtractive cancellation of harmonic noise will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-4023730