Pseudo-cepstral adaptive short-term post-filters for speech...

Details Pseudo-cepstral adaptive short-term post-filters for speech... Pseudo-cepstral adaptive short-term post-filters for speech...

2007-09-11

2007-09-11

Smits, Talivaldis Ivars (Department: 2626)

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

C704S219000

Reexamination Certificate

active

10684852

ABSTRACT:
Methods and systems for filtering synthesized or reconstructed speech are implemented. A filter based on a set of linear predictive coding (LPC) coefficients is constructed by transforming the LPC coefficients to the pseudo-cepstrum, a domain existing between LPC domain and the line spectral frequency (LSF) domain. The resulting filter can emphasize spectral frequencies associated with various formants, or spectral peaks, of an inverse transfer function relating to the LPC coefficients, and can de-emphasize spectral frequencies associated with various spectral minima, or spectral valleys, of the inverse transfer function relating to the LPC coefficients.

REFERENCES:
H. K. Kim, S. H. Choi, and H. S. Lee, “On approximating line spectral frequencies to LPC cepstral coefficients,” IEEE Trans. Speech Audio Processing, vol. 8, No. 2, pp. 195-199, Mar. 2000.
Hong Kook Kim and Hong-Goo Kang, “A pseudo-cepstrum based short-term postfilter,” Proc. IEEE Workshop on Speech Coding, pp. 99-101, Sep. 2000.
Juin-Hwey Chen and Allen Gersho, “Adaptive Postfiltering for Quality Enhancement of Coded Speech,” IEEE Trans. Speech and Audio Processing, vol. 3, No. 1, p. 59-71, Jan. 1995.
H. Tasaki, K. Shiraki, K. Tomita, and S. Takahashi, “Spectral postfilter design based on LSP transformation,” Proc. IEEE Workshop on Speech Coding, p. 57-58, Sep. 1997.
Azhar Mustapha and Suat Yeldener, “An adaptive post-filtering technique based on the modified Yule-Walker filter,” Proc. IEEE ECASSP '99, pp. 197-200, Mar. 1999.
Azhar Mustapha and Suat Yeldener, “An adaptive post-filtering technique based on a least-squares approach,” Proc. IEEE Workshop on Speech Coding, pp. 156-158, Jun. 1999.
Robert Endre Tarjan and Andrew Chi-Chih Yao, “Storing a Sparse Table”, Communication of the ACM, vol. 22:11, pp. 606-611.
Y. Stylianou (1998) “Concatenative Speech Synthesis using a Harmonic plus Noise Model”, Workshop on Speech Synthesis, Jenolan Caves, NSW, Australia, Nov. 1998.

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