A Band Extension Technique for Narrow-Band Telephony Speech Based on Full Wave Rectification

Naofumi AOKI  

IEICE TRANSACTIONS on Communications   Vol.E93-B   No.3   pp.729-731
Publication Date: 2010/03/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E93.B.729
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Network
band extension,  telephony speech,  full wave rectification,  

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This study investigates a band extension technique for narrow-band telephony speech. The proposed technique employs full wave rectification that nonlinearly generates high-band overtones from the low band. In order to improve the conventional technique, this study investigates a frame-by-frame gain control based on the estimation of gain parameter from narrow-band telephony speech. A subjective evaluation indicates that the proposed technique outperforms the conventional technique.