Wideband extension of telephone speech for higher perceptual...

Details Wideband extension of telephone speech for higher perceptual... Wideband extension of telephone speech for higher perceptual...

2001-11-09

2008-03-18

Armstrong, Angela (Department: 2626)

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

Reexamination Certificate

active

07346499

ABSTRACT:
Wideband extension of telephone speech for higher perceptual quality. A method for extending the frequency range of a speech signal using wideband extension method with an inverse filter and a synthesis filter where both filters receive LPC coefficients from an LPC estimator. The wideband LPC coefficients are obtained from wideband LSFs. The wideband LSFs are obtained by appending highband LSFs, created by applying a matrix to narrowband LSFs, and lowband LSFs, created by dividing the narrowband LSFs by two. The matrix used to create the highband LSFs is selected from a predetermined list of matrices. The selection is based on either wideband or narrowband reflection coefficients extracted from the narrowband speech signal.

REFERENCES:
patent: 6704711 (2004-03-01), Gustafsson et al.
Miet et al, “Low-Band Extension of Telephone Band Speech,” 2000 IEEE International Conference on Acoustics, Speech, and Signal Processing, pp. 1851-1854, vol. 3.
J. Epps et al; “A New Technique for Wideband Enhancement of Coded Narrowband Speech”, IEEE Workshop on Speech Coding Proceedings, Mode, Coders and Error Criteria, XX, XX, Jun. 20, 1999, pp. 174-176, XP002159073.
G. Miet et al; “Low-Band Extension of Telephone-Band Speech”, 2000 IEEE International Conference on Acoustics, Speech, and Signal Processing. Proceedings (Cat. No. 00CH37100), Proceedings of 2000 International Conference on Acoustics, Speech and Signal Processing, Istanbul, Turkey, Jun. 5-9, 2000, pp. 1851-1854, vol. 3, XP002189055.
S. Chennoukh et al; “Speech Enhancement Via Frequency Bandwidth Extension Using Line Spectral Frequencies”, 2001 IEEE International Conference on Acoustics, (Cat. No. 01CH37221), 2001 IEEE International Conference on Acoustics, Speech, and Signal Processing. Proceedings, Salt Lake City, UT, USA, May 7-11, 2001. pp. 665-668, vol. 1, XP002189056.

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