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New Nonuniform Transmission and ADPCM Coding System for Improving Both Signal-to-Noise Ratio and Bit Rate

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3 Author(s)
Elisabeth Lahalle ; SUPELEC Systems Sciences/Dept. of Signal Processing and Electronic Systems, E3S, Gif-sur-Yvette, France ; Gilles Fleury ; Rawad Zgheib

Here we address the problem of adaptive digital-transmission systems. New systems based on a nonuniform transmission (NUT) principle are proposed, utilizing a recently proposed algorithm for adaptive identification and reconstruction of AR processes subject to missing data. We propose a new adaptive sampling (nonuniform transmission) method combined with the adaptive reconstruction algorithm. A new NUT-ADPCM coding-decoding system is designed. The proposed system is demonstrated for audio-signal compression and compared to the ADPCM G.726 standard. The new system yields improvements in both signal-to-noise ratio and average bit rate.

Published in:

IEEE Signal Processing Letters  (Volume:18 ,  Issue: 3 )