DocumentCode :
350797
Title :
Speech restoration from LPC parameters corrupted by channel noise
Author :
Premkumar, A.B. ; Eeluang, Ang ; Madhukuma, A.S.
Author_Institution :
Sch. of Appl. Sci., Nanyang Technol. Inst., Singapore
Volume :
1
fYear :
1999
fDate :
1999
Firstpage :
138
Abstract :
Restoration of speech parameters that have been degraded by noisy channel is of paramount importance, since mutilated speech parameters such as linear predictive coefficients (LPC) may render speech totally irrecoverable. The paper provides a technique using discrete dyadic wavelet transforms as a preprocessing stage prior to LPC extraction. We show that this step makes the speech parameters more robust to noise perturbation in the channel and hence makes recovery of speech possible. We discuss the effects of applying a single level and a three level transformation to speech prior to compression and compare the quality of recovered speech in both cases. We also apply a Wiener filter to the wavelet coefficients and show that the recovered speech is of appreciable quality
Keywords :
Wiener filters; data compression; discrete wavelet transforms; filtering theory; linear predictive coding; noise; signal restoration; speech coding; speech enhancement; speech intelligibility; transform coding; LPC extraction; LPC parameters; Wiener filter; channel noise; discrete dyadic wavelet transforms; linear predictive coefficients; mutilated speech parameters; noise perturbation; noisy channel; preprocessing stage; recovered speech quality; single level transformation; speech compression; speech enhancement; speech parameters restoration; speech recovery; speech restoration; three level transformation; wavelet coefficients; Additive noise; Additive white noise; Degradation; Discrete wavelet transforms; Linear predictive coding; Noise reduction; Signal synthesis; Speech enhancement; Speech processing; Speech synthesis;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
TENCON 99. Proceedings of the IEEE Region 10 Conference
Conference_Location :
Cheju Island
Print_ISBN :
0-7803-5739-6
Type :
conf
DOI :
10.1109/TENCON.1999.818369
Filename :
818369
Link To Document :
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