DocumentCode :
1211964
Title :
Speech Bandwidth Extension Using Temporal Envelope Modeling
Author :
Kim, Kyung-Tae ; Lee, Min-Ki ; Kang, Hong-Goo
Author_Institution :
Dept. of Electr. & Electron. Eng., Yonsei Univ., Seoul
Volume :
15
fYear :
2008
fDate :
6/30/1905 12:00:00 AM
Firstpage :
429
Lastpage :
432
Abstract :
Speech bandwidth extension (SBE) assumes that high-frequency components of a speech signal, e.g., the frequency band of 4-7 kHz, can be estimated by parameters extracted from the narrowband signal (0-4 kHz). Therefore, it is very important to understand the characteristics of the highband signal as well as perceptual cues to represent the highband signal. This letter proposes a new SBE algorithm using a temporal envelope model. The temporal envelope model considers band-limited temporal envelopes as the perceptual cue of the 4-7 kHz band signal while it deemphasizes the importance of rapidly varying components. To implement the SBE with no additional bits, the proposed method adopts a Gaussian mixture model (GMM) to estimate the temporal envelope of the highband signal from that of the narrowband one. Simulation results confirm that the proposed SBE algorithm shows better perceptual quality than a conventional source-filter model-based approach.
Keywords :
Gaussian processes; signal representation; speech processing; Gaussian mixture model; frequency 4 kHz to 7 kHz; high-frequency speech signal component; perceptual cues; signal representation; speech bandwidth extension; temporal envelope modeling; Bandwidth; Frequency estimation; Narrowband; Parameter estimation; Production systems; Signal generators; Signal synthesis; Speech; Telephony; Wideband; Highband modeling; perception; speech bandwidth extension; temporal envelope; wideband speech;
fLanguage :
English
Journal_Title :
Signal Processing Letters, IEEE
Publisher :
ieee
ISSN :
1070-9908
Type :
jour
DOI :
10.1109/LSP.2008.922520
Filename :
4512090
Link To Document :
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