NDLI: Wideband enhancement of narrowband coded speech using MBE re-synthesis

Content Provider	IEEE Xplore Digital Library
Author	Cheung-Fat Chan Wai-Kwong Hui
Copyright Year	1996
Description	Author affiliation: Dept. of Electron. Eng, City Univ. of Hong Kong, Kowloon, Hong Kong (Cheung-Fat Chan)
Abstract	A method for improving the quality of narrowband CELP-coded speech is presented. The approach is to reduce the hoarse quality of CELP-coded speech by enhancing the pitch periodicity in the reproduction signal and also to reduce the muffing characteristics of narrowband speech by regenerating the highband components of speech spectra from the reproduction signal. In the proposed method, multiband excitation (MBE) analysis is performed on the reproduction speech signal from a CELP decoder and the pitch periodicity is enhanced by re-synthesizing the speech signal using a harmonic synthesizer according to the MBE model. The highband magnitude spectra are regenerated by matching to lowband spectra using a trained wideband spectral codebook. Information about the voiced/unvoiced (V/UV) excitation in the highband are derived from a training procedure and then stored alongside with the wideband spectral codebook so that they can be recovered by indexing to the codebook using the matched lowband index. Simulation results indicate that the duality of the wideband resynthesized speech is significantly improved over the narrowband CELP-coded speech.
Starting Page	667
Ending Page	670
File Size	556063
Page Count	4
File Format	PDF
ISBN	0780329120
DOI	10.1109/ICSIGP.1996.567351
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1996-10-18
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Wideband Narrowband Speech enhancement Speech analysis Speech synthesis Harmonic analysis Signal analysis Performance analysis Decoding Synthesizers
Content Type	Text
Resource Type	Article

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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