1[1]S. F. Boll, "Suppression of acoustic noise in speech using spectral subtraction," IEEE Trans.Acoust., Speech, Signal Processing, vol. ASSP-27,pp. 113-120, Apr. 1979.
2[2]J. S. Lim, and A. V. Oppenheim, "Enhancement and bandwidth compression of noisy speech,"Proc. IEEE, vol. 67, pp. 1586-1604, Dec.1979.
3[3]M. Berouti, R. Schwartz, and J. Makhoul, "Enhancement of speech corrupted by acoustic noise,"in Proc. IEEE ICASSP, Washington, DC,Apr. 1979, pp. 208-211.Signals. Englewood Cliffs, NJ:Prentice-Hall, 1993.