Multipulse excited pole-zero filtering approach for noise reduct

Details Multipulse excited pole-zero filtering approach for noise reduct Multipulse excited pole-zero filtering approach for noise reduct

1989-04-07

1991-04-09

Kemeny, Emanuel S.

Electrical audio signal processing systems and devices

One-way audio signal program distribution

Public address system

381 49, G10L 500

Patent

active

050070940

ABSTRACT:
A pulse train of primary pulses is estimated from an inverse LPC analysis of a frame of voiced speech. From this estimated pulse train a pole-zero filter is estimated. The estimated pulse train is used to excite the estimated pole-zero filter to produce a synthesized speech signal. The synthesized speech signal is compared to the original frame of speech to determine the error in the original speech signal. Both the pulse amplitude and filter are adjusted to compensate for the error and another synthesized speech signal is produced. The process may be repeated until the synthesized speech signal and original speech signal converge.

REFERENCES:
B. S. Atal and J. R. Remde, "A New Model of LPC Excitation Producing Natural-Sounding Speech at Low Bit Rates", Proc. IEEE Conf. Acoust., Speech & Sig. Proc., 1982, pp. 617-617.
I. M. Trancoso, R. Garcia Gomez, and J. M. Tribolet "A Study on Short-Time Phase and Multipulse LPC", Proc. Int. Conf. Acoust., Speech and Sig. Proc., Mar. 1984, pp. 10.3.1-10.3.4.
I. M. Trancoso, L. B. Almeida and J. M. Tribolet, "Pole-Zero Multiple Speech Representation Using Harmonic Modelling in the Frequency Domain," Proc. Int. Conf. Acoust., Speech and Sig. Proc., 1985, pp. 260-263.
T. F. Quatieri and R. J. McAulay, "Mixed-Phase Deconvolution of Speech".
Based on a Sine-Wave Model, Proc. Int. Conf. Acoust., Speech and Sig. Proc., 1987, pp. 649-652.
K. K. Paliwal, "Speech Enhancement Using Multipulse Excited Linear Prediction System," Proc. Int. Conf. Acoust., Speech and Sig. Proc., 1986, pp. 101-104.
K. J. Astrom, "Maximum Likelihood and Prediction Error Methods" 5th IFAC Symposium on Identification and System Parameter Estimation, 1979.
A. E. Rosenberg, "Effect of Glotal Pulse Shape on the Quality of Natural Vowels", The J. of Acoustical Soc. of America, vol. 49, No. 2, 1971, pp. 583-590.

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