NDLI: Bandwidth extension of narrowband speech using integer wavelet transform

Content Provider	IET Digital Library
Author	Nizampatnam, Prasad Tappeta, Kishore Kumar
Abstract	Public telephone systems transmit speech across a limited frequency range, about 300–3400 Hz, called narrowband (NB) which results in a significant reduction of quality and intelligibility of speech. This study proposes a fully backward compatible novel method for bandwidth extension (BWE) of NB speech. The method uses integer wavelet transform technique to provide a perceptually better wideband (WB) speech signal. The spectral envelope parameters are extracted from the down sampled frequency shifted version of the high-frequency components of speech signal existing above NB, which are spread by using pseudo-noise codes, and are embedded in the integer wavelet coefficients of NB speech signal. The hearing threshold is calculated in the integer wavelet domain and this threshold is employed as the embedding threshold. The embedded information is extracted at the receiving end to reconstruct the WB speech signal. Theoretical and simulation analyses show that the proposed method is robust to quantisation and channel noises. The comparison category rating listening and log spectral distortion tests clearly show that the reconstructed WB signal gives a much better performance in terms of speech quality when compared with some of the existing speech BWE methods employing data hiding.
Starting Page	437
Ending Page	445
Page Count	9
ISSN	17519675
Volume Number	11
e-ISSN	17519683
Issue Number	Issue 4, Jun (2017)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-spr/11/4
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-spr.2016.0453
Journal	IET Signal Processing
Publisher Date	2016-11-30
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Bandwidth Extension BWE Channel Noise Embedded Information Extraction Embedding Threshold Frequency 300 Hz to 3000 Hz Hearing Threshold High-frequency Speech Signal Component Integer Wavelet Transform Integral Transforms Log Spectral Distortion Tests Narrowband Speech NB Speech Signal Pseudonoise Code Public Telephone System Quantisation (signal) Quantisation Noise Signal Reconstruction Spectral Analysis Spectral Envelope Parameter Extraction Speech And Audio Coding Speech Coding Speech Intelligibility Speech Processing Technique Speech Quality Reduction Speech Transmission Telephone Network Telephony Voice Communication Wavelet Transform WB Speech Signal Reconstruction Wideband Speech Signal
Content Type	Text
Resource Type	Article
Subject	Signal Processing Electrical and Electronic Engineering

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
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3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
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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