Electrical audio signal processing systems and devices – Noise or distortion suppression – Spectral adjustment
Reexamination Certificate
2007-11-27
2007-11-27
Chin, Vivian (Department: 2615)
Electrical audio signal processing systems and devices
Noise or distortion suppression
Spectral adjustment
C381S094100, C381S094200, C704S226000
Reexamination Certificate
active
10343744
ABSTRACT:
An amplitude suppression quantity denoting a noise suppression level of a current frame is calculated in an amplitude suppression quantity calculating unit (20), a perceptual weight distributing pattern of both a spectral subtraction quantity and a spectral amplitude suppression quantity is determined in a perceptual weight pattern adjusting unit (21), the spectral subtraction quantity and the spectral amplitude suppression quantity given by the perceptual weight distributing pattern are corrected according to a frequency band SN ratio in a perceptual weight correcting unit (7), a noise subtracted spectrum is calculated from an amplitude spectrum, a noise spectrum and a corrected spectral subtraction quantity in a spectrum subtracting unit (8), and a noise suppressed spectrum is calculated from the noise subtracted spectrum and a corrected spectral amplitude suppression quantity in a spectrum suppressing unit (9).
REFERENCES:
patent: 5636324 (1997-06-01), Teh et al.
patent: 5757937 (1998-05-01), Itoh et al.
patent: 6671667 (2003-12-01), Chandran et al.
patent: 7043030 (2006-05-01), Furuta
patent: 0727769 (1996-08-01), None
patent: 1059628 (2000-12-01), None
patent: 1100077 (2001-05-01), None
patent: 10-97288 (1998-04-01), None
patent: 10-161694 (1998-06-01), None
patent: 2000-47697 (2000-02-01), None
Stefan Gustafsson et al.: “A novel psychoacoustically motivated audio enhancement algorithm preserving background noise characteristics” Proceedings IF ICASSP-98, vol. 1, pp. 397-400, May 12, 1998.
Kenzo Itoh et al.: “Environmental noise reduction based on speech
on-speech identification for hearing aids” Proceedings of ICASSP-97, vol. 1, pp. 419-422, Apr. 21, 1997.
Steven F. Boll: “Suppression of acoustic noise in speech using spectral subtraction” IEEE Trans. ASSP, vol. ASSP-27, No. 2, pp. 113-120, Apr. 1979.
Chin Vivian
Mitsubishi Denki & Kabushiki Kaisha
Suthers Douglas
LandOfFree
Noise suppressor does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Noise suppressor, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Noise suppressor will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3805564