A Spectral Subtraction Based Algorithm for Real-time Noise Cancellation with Application to Gunshot Acoustics

Antonio Ramos, Holm Sverre, Sigmund Gudvangen, Ragnvald Otterlei

Abstract


This paper introduces an improved spectral subtraction based algorithm for real-time noise cancellation, applied to gunshot acoustical signals. The derivation is based on the fact that, in practice, relatively long periods without gunshot signals occur and the background noise can be modeled as being short-time stationary and uncorrelated to the impulsive gunshot signals. Moreover, gunshot signals, in general, have a spiky autocorrelation while typical vehicle noise, or related, is periodic and exhibits a wider autocorrelation. The Spectral Suppression algorithm is applied using the pre-filtering approach, as opposed to post-filtering which requires a priori knowledge of the direction of arrival of the signals of interest, namely, the Muzzle blast and the Shockwave. The results presented in this work are based on a dataset generated by combining signals from real gunshots and real vehicle noise.



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References


J. W. M. DuMond, E. R. Cohen, W. K. H. Panofsky, and E. Deeds, “A determination of the wave forms and laws of propagation and dissipation of ballistic shock waves,” The Journal of the Acoustical Society of America, vol. 18, no. 1, pp. 97–118, 1946.

A. D. Pierce, “Statistical theory of atmospheric turbulence effects on sonic-boom rise times,” The Journal of the Acoustical Society of America, vol. 49, no. 3B, pp. 906–924, 1971.

H. E. Bass, B. A. Layton, L. N. Bolen, and R. Raspet, “Propagation of medium strength shock waves through the atmosphere,” The Journal of the Acoustical Society of America, vol. 82, no. 1, pp. 306–310, 1987.

R. Raspet, H. E. Bass, L. Yao, P. Boulanger, and W. E. McBride, “Statistical and numerical study of the relationship between turbulence

and sonic boom characteristics,” The Journal of the Acoustical Society of America, vol. 96, no. 6, pp. 3621–3626, 1994.

P. Boulanger, R. Raspet, and H. E. Bass, “Sonic boom propagation through a realistic turbulent atmosphere,” The Journal of the Acoustical Society of America, vol. 98, no. 6, pp. 3412–3417, 1995.

W. B. Snow, “Survey of acoustic characteristics of bullet shock waves,” IEEE Transactions on Audio and Electroacoustics, vol. 15, no. 4, pp. 161–176, 1967.

B. M. Sadler, T. Pham, and L. C. Sadler, “Optimal and wavelet-based shock wave detection and estimation,” The Journal of the Acoustical Society of America, vol. 104, no. 2, pp. 955–963, 1998.

R. C. Maher, “Acoustical characterization of gunshots,” SAFE 2007: Workshop on Signal Processing Applications for Public Security and Forensics, pp. 109–113, 11–13 April 2007, Washington D.C.,USA.

A. L´edeczi, P. V¨olgyesi, M. Mar ´oti, G. Simon, G. Balogh, A. N´adas, B. Kusy, S. D´ora, and G. Pap, “Multiple simultaneous acoustic source localization in urban terrain,” in IPSN ’05: Proceedings of the 4th international symposium on Information processing in sensor networks. Piscataway, NJ, USA: IEEE Press, 2005, p. 69.

J. R. Aguilar, R. A. Salinas, and M. A. Abidi, “Acoustical model of small calibre ballistic shock waves in air for automatic sniper localization applications,” in Poceedings of SPIE, Sensors, and Command, Control, Communications, and Intelligence (C3I) Technologies for Homeland Security and Homeland Defense VI, 2007.

A. L. L. Ramos, S. Holm, S. Gudvangen, and R. Otterlei, “Delay-andsum beamforming for direction of arrival estimation applied to gunshot acoustics,” Poceedings of SPIE, Sensors, and Command, Control, Communications, and Intelligence (C3I) Technologies for Homeland Security and Homeland Defense X, vol. 8019, May 2011.

“Real-time vehicle noise cancellation techniques for gunshot acoustics,” Poceedings of SPIE, Sensors, and Command, Control, Communications, and Intelligence (C3I) Technologies for Homeland Security and Homeland Defense X, vol. 8359, May 2012.

“A modified spectral subtraction algorithm for real-time noise reduction applied to gunshot acoustics,” in Poceedings of the International Conference on Signals and Electronic Systems, ICSES 2012, Wroclaw, Poland, September 2012.

B. M. Brustad and J. C. Freytag, “A survey of audio forensic gunshot investigations,” in Audio Engineering Society Conference: 26th International Conference: Audio Forensics in the Digital Age, July 2005.

S. Boll, “Suppression of acoustic noise in speech using spectral subtraction,”IEEE Transactions on Acoustics, Speech and Signal Processing, vol. 27, no. 2, pp. 113–120, April 1979.

Y. Ephraim and D. Malah, “Speech enhancement using a minimum-mean square error short-time spectral amplitude estimator,” IEEE Transactions on Acoustics, Speech and Signal Processing, vol. 32, no. 6, pp. 1109–1121, December 1984.

M. Mizumachi and M. Akagi, “Noise reduction by paired microphonesusing spectral subtraction,” Proceedings of the 1998 IEEE International Conference on Acoustics, Speech and Signal Processing, vol. 2, pp. 1001–1004, May 1998.

H. Gustafsson, S. Nordholm, and I. Claesson, “Spectral subtraction using reduced delay convolution and adaptive averaging,” IEEE Transactions on Speech and Audio Processing, vol. 9, no. 8, pp. 799–807, November 2001.

J. Meyer and K. Simmer, “Multi-channel speech enhancement in a car environment using wiener filtering and spectral subtraction,” IEEE International Conference on Acoustics, Speech, and Signal Processing, vol. 2, pp. 1167–1170, April 1997.

T. Tosanguan, R. Dickinson, and E. Drakakis, “Modified spectral subtraction for de-noising heart sounds: Interference suppression via spectral comparison,” in IEEE Biomedical Circuits and Systems Conference. BioCAS 2008, November 2008, pp. 29–32.

R. Martin, “Noise power spectral density estimation based on optimal smoothing and minimum statistics,” IEEE Transactions on Speech and Audio Processing, vol. 9, no. 5, pp. 504–512, July 2001.

T. Kasparis and J. Lane, “Suppression of impulsive disturbances from audio signals,” Electronics Letters, vol. 29, no. 22, pp. 1926–1927, October 1993.

A. Dufaux, “Detection and recognition of impulsive sound signals,” Ph.D. dissertation, University of Neuchˆatel, Switzerland, 2001


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