Electrical audio signal processing systems and devices – Noise or distortion suppression – Spectral adjustment
Patent
1996-12-23
2000-08-01
Kuntz, Curtis
Electrical audio signal processing systems and devices
Noise or distortion suppression
Spectral adjustment
381 942, H04B 1500
Patent
active
060978201
ABSTRACT:
A noise suppressor that increases a signal to noise ratio of time domain audio data and a method of increasing such signal to noise ratio. The noise suppressor includes: (1) frequency domain transformation circuitry that transforms a frame of the time domain audio data into a frequency domain, (2) noise background modeling circuitry, coupled to the domain transformation circuitry, that spectrally analyzes the frame to model an estimated noise background spectrum thereof, (3) a frequency domain suppression filter, coupled to the noise background modeling circuitry, that filters at least some of the noise background spectrum from the frame and (4) time domain transformation circuitry, coupled to the frequency domain suppression filter, that transforms the frame back into a time domain, the transformed frame having an increased signal to noise ratio.
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Article entitled "Enhancement and Bandwidth Compression of Noisy Speech" by Jae S. Lim and Alan V. Oppenheim From the Proceedings of the IEEE, vol. 67, No. 12, Dec. 1979; pp. 1586-1604.
Article entitled "Suppression of Acoustic Noise in Speech Using Spectral Subtraction" by Steven F. Boll From the IEEE Transactions on Acoustics, Speech and Signal Processing, vol. ASSP-27, No. 2, Apr. 1979; pp. 61-68.
Kuntz Curtis
Lucent Technologies - Inc.
Mei Xu
LandOfFree
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