Frequency-domain spectral envelope estimation for monophonic and

Details Frequency-domain spectral envelope estimation for monophonic and Frequency-domain spectral envelope estimation for monophonic and

1996-11-07

1999-02-09

Knepper, David D.

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

704224, G10L 904

Patent

active

058707042

ABSTRACT:
Estimating the time-varying spectrum envelope of a time-varying signal facilitates pitch modification and other shifting of signal content in the frequency domain. Local maxima of a spectrum of the signal are identified by applying a masking curve. The masking curve has a peak at the particular maximum and descends away therefrom the local maximum. Local maxima falling below the local maximum are eliminated. The slope of the masking curve is varied in accordance with measured parameters of the spectrum to decrease or eliminate spurious peaks. Thereafter, a smoothing procedure may be applied to smooth the spectrum in frequency.

REFERENCES:
patent: 3649765 (1972-03-01), Rabiner et al.
patent: 3982070 (1976-09-01), Flanagan
patent: 4051331 (1977-09-01), Strong et al.
patent: 4246617 (1981-01-01), Portnoff
patent: 4384335 (1983-05-01), Duifhuis et al.
patent: 4559602 (1985-12-01), Bates, Jr.
patent: 4809332 (1989-02-01), Jongman et al.
patent: 4829574 (1989-05-01), Dewhurst et al.
patent: 4856068 (1989-08-01), Quatieri, Jr. et al.
patent: 4885790 (1989-12-01), McAulay et al.
patent: 5504832 (1996-04-01), Taguchi
patent: 5504833 (1996-04-01), George et al.
patent: 5536902 (1996-07-01), Serra et al.
patent: 5712437 (1998-01-01), Kageyama
M. Dolson, "The phase vocoder," a tutorial, Computer Music J., 10(4), pp. 14-27.
J.L. Flanagan and R.M. Golden, "Phase vocoder," Bell Syst. Tech. J., pp. 1493-1509, (Nov. 1966).
E. Moulines and J. Laroche, "Non Parametric Techniques for Pitch-Scale Modification of Speech," Speech Communication, 16, pp. 175-205, (Feb. 1995).
M.R. Portnoff, "Implementation of the Digital Phase Vocoder Using the Fast Fourier Transform," IEEE Trans. Acoust., Speech, Signal Processing, pp. 243-248, (Jun. 1976).
R. Portnoff, "Short-time Fourier Analysis of Sampled Speech," IEEE Trans. Acoust., Speech, Signal Processing, pp. 364-373.
R. Portnoff, "Time-Scale Modifications of Speech Based on Short-Time Fourier Analysis," IEEE Trans. Acoust., Speech, Signal Processing, pp. 374-390.
James L. Flanagan, Speech Analysis, Synthesis and Perception, Springer-Verlag, New York, 1972, pp. 167-172.
Leo L. Beranek, Acoustics, McGraw-Hill Book Company, Inc., New York, Toronto, London, 1954, pp. 392-396 and 402-406.
Thomas W. Parsons, Voice and Speech Processing, McGraw-Hill, Inc., New York, 1987, pp. 219-222.
Lawrence R. Rabiner & Ronald W. Schafer, Digital Processing of Speech Signals, Prentice Hall, New Jersey, 1978, pp. 158-161.
Daniel N. Lapedes, McGraw-Hill Dictionary of Physics and Mathematics, McGraw-Hill Book Company, NY, 1978, p. 1053.

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