A Bandwidth Extension Scheme for G.711 Speech by Embedding Multiple Highband Gains

Hae-Yong YANG  Kyung-Hoon LEE  Sung-Jea KO  

IEICE TRANSACTIONS on Communications   Vol.E94-B   No.10   pp.2941-2944
Publication Date: 2011/10/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E94.B.2941
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Multimedia Systems for Communications
bandwidth extension,  multiple highband gains,  data embedding,  G.711 speech coder,  

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We present an improvement to the existing steganography-based bandwidth extension scheme. Enhanced WB (wideband) speech quality is achieved by embedding multiple highband spectral gains into a G.711 bitstream. The number of spectral gains is selected by optimizing the quantity of the embedding data with respect to the quality of the extended WB speech. Compared to the existing method, the proposed scheme improves the WB PESQ (Perceptual Evaluation of Speech Quality) score by 0.334 with negligible degradation of the embedded narrowband speech.