Data processing: speech signal processing – linguistics – language – Speech signal processing – For storage or transmission
Patent
1998-01-07
2000-05-30
Hudspeth, David R.
Data processing: speech signal processing, linguistics, language
Speech signal processing
For storage or transmission
381 943, 704205, G10L 302, G10L 916
Patent
active
060701374
ABSTRACT:
A system for encoding voice while suppressing acoustic background noise and a method for suppressing acoustic background noise in a voice encoder are described herein. The voice encoder includes a sampler that captures frames of time-domain samples of an audio signal. A voice activity detector operatively coupled to the sampler determines presence or absence of speech in the current frame. A transformer is operatively coupled to the sampler for transforming the frame of time-domain audio samples into an estimate of the power spectrum of that frame. A noise model adapter operatively associated with the transformer updates a frequency-domain noise model based on the power spectrum estimate of the current frame if the voice activity detector indicates an absence of speech in this frame. A filter computation block operatively coupled to the noise model adapter and the transform computes a spectral enhancement (noise suppression) filter based on the current power spectrum estimate and the adapted noise model. A spectral enhancement block operatively coupled to the transformer and the filter computation block applies the spectral enhancement filter to the current power spectrum estimate. A quantizer and encoder block transforms the voice encoder model parameters, including the enhanced spectral magnitudes, into a frame of encoded bits.
REFERENCES:
patent: 4628529 (1986-12-01), Borth et al.
patent: 4811404 (1989-03-01), Vilmur et al.
patent: 5247579 (1993-09-01), Hardwick et al.
patent: 5544250 (1996-08-01), Urbanski
patent: 5581656 (1996-12-01), Hardwick et al.
patent: 5630011 (1997-05-01), Lim et al.
patent: 5659622 (1997-08-01), Ashley
patent: 5864794 (1999-01-01), Tasaki
"The Sinusoidal Transform Coder at 2400 b/s", McAulay, R. J. et al. Communications-Fusing Command, Control and Intelligence, San Diego, Oct. 11-14, 1992, vol. 1, No. CONF. 11, Oct. 11, 1992, pp. 378-380, Institute of Electrical and Electronics Engineers.
"The Application of the Imbe Speech Coder to Mobile Communications", Hardwick, J.C. et al. Speech Processing 1, Toronto, May 14-17, 1991, vol. 1, No. CONF. 16, May 14, 1991, pp. 249-252, Institute of Electrical and Electronics Engineers.
"Speech Enhancement Using a Soft-Decision Noise Suppression Filter", McAulay & Malpass. IEEE Transactions on Acoustics, Speech, and Signal Processing, vol. ASSP-28, No. 2, Apr. 1980, IEEE.
"New Methods of Adaptive Noise Suppression", Arslan, McCree & Viswanathan. ICASSP-95, Detroit, May 1995.
"Suppression of Acoustic Noise in Speech Using Spectral Subtraction", Boll. IEEE Transactions on Acoustics, Speech, and Signaling Processing, vol. ASSP-27, No. 2, Apr. 1979.
Bloebaum Leland S.
Johnson Phillip M.
Ericsson Inc.
Hudspeth David R.
Smits Talivaldis Ivars
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