Hybrid Transform Based Speech Band Width Enhancement Using Data Hiding

The limited narrow band (LNB) speech signal spread in the range of 300 to 3400Hz used in public switched telephone networks results in poor-quality telephony speech. Bandwidth extension techniques are performed to expand the frequency range from LNB speech to a clear wideband (CWB) speech signal ran...

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Bibliographic Details
Published in:Traitement du signal 2022-06, Vol.39 (3), p.969-975
Main Authors: Koduri, Sunil Kumar, T, Kishore Kumar
Format: Article
Language:English
Subjects:
Algorithms
Approximation
Bandwidths
Code Division Multiple Access
Discrete cosine transform
Discrete Wavelet Transform
Fourier transforms
Frequency ranges
Methods
Noise
Spectrum allocation
Speech
Telephony
Wavelet transforms
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Summary:The limited narrow band (LNB) speech signal spread in the range of 300 to 3400Hz used in public switched telephone networks results in poor-quality telephony speech. Bandwidth extension techniques are performed to expand the frequency range from LNB speech to a clear wideband (CWB) speech signal range of 50Hz-7000Hz over existing public telephone networks. In this paper, a novel robust speech bandwidth extension algorithm by Discrete Wavelet Transform- Discrete Cosine Transform- Based Data Hiding (DWT-DCT-DH) Hybrid transform model was used to spread the out-of-band (3400Hz to 7000Hz) speech frequencies over the LNB speech. In this proposed technique the out-of-band speech frequencies are embedded in LNB speech and imperceptibly spread over the network. These Embedded out-of-band speech frequencies are recovered steadily at the receiver end to generate a restored CWB telephony speech of considerably better quality. The proposed technique simulation results show more intelligible and better-quality telephony speech generated compared to the other bandwidth extension techniques.
ISSN:0765-0019
1958-5608
DOI:10.18280/ts.390324