Data processing: speech signal processing – linguistics – language – Speech signal processing – For storage or transmission
Reexamination Certificate
2007-01-02
2007-01-02
Mei, Xu (Department: 2615)
Data processing: speech signal processing, linguistics, language
Speech signal processing
For storage or transmission
C381S094200, C381S094300
Reexamination Certificate
active
09599367
ABSTRACT:
In the noise suppression apparatus, a spectrum correction gain calculation unit calculates the noise amplitude spectrum correction gain and the noise removal spectrum correction gain using the input amplitude spectrum, noise amplitude spectrum and respective coefficients; a spectrum deduction unit deducts the product of the noise amplitude spectrum and the noise amplitude spectrum correction gain from the input amplitude spectrum and outputs the result as a first noise removal spectrum; a spectrum suppression unit multiplies the first noise removal spectrum by the noise removal spectrum correction gain and outputs the result as a second noise removal spectrum; finally a frequency/time conversion unit converts the second noise removal spectrum into a time domain signal.
REFERENCES:
patent: 4811404 (1989-03-01), Vilmur et al.
patent: 5668927 (1997-09-01), Chan et al.
patent: 5687285 (1997-11-01), Katayanagi et al.
patent: 5742927 (1998-04-01), Crozier et al.
patent: 5757937 (1998-05-01), Itoh et al.
patent: 5812970 (1998-09-01), Chan et al.
patent: 6032114 (2000-02-01), Chan
patent: 6477489 (2002-11-01), Lockwood et al.
patent: 6671667 (2003-12-01), Chandran et al.
patent: 7043030 (2006-05-01), Furuta
patent: 0 683 482 (1995-11-01), None
patent: 2 768 547 (1999-03-01), None
patent: 8-506427 (1996-07-01), None
patent: 8-221093 (1996-08-01), None
patent: 9-212196 (1997-08-01), None
patent: 11-162240 (1999-06-01), None
patent: WO 94/18666 (1994-08-01), None
B. L. Sim, et al., IEEE Transactions on Speech and Audio Processing, vol. 6, No. 4, pp. 328-336, XP-000785363, “A Parametric Formulation of the Generalized Spectral Subtraction Method”, Jul. 1, 1999.
L. Arslan, et al., Acoustics, Speech, and Signal Processing, pp. 812-815, XP-010151342, “New Methods for Adaptive Noise Suppression”, May 9, 1995.
R. Le Bouquin, Speech Communication, Elsevier Science Publishers, vol. 18, No. 1, pp. 3-19, XP-004008920, “Enhancement of Noisy Speech Signals: Application to Mobile Radio Communications”, 1996.
Steven F. Boll, “Suppression of Acoustic Noise in Speech Using Spectral Subtraction,” IEEE Transactions on Acoustics, Speech, and Signal Processing, vol. ASSP-27, No. 2, Apr. 1979, pp. 113-120.
Mei Xu
Mitsubishi Denki & Kabushiki Kaisha
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