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Signal modification for ADPCM based on analysis-by-synthesis framework

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2 Author(s)
Jong Won Shin ; Sch. of Electr. Eng., Seoul Nat. Univ., South Korea ; Nam Soo Kim

In this letter, we propose a novel approach to improve the performance of the adaptive differential pulse code modulation (ADPCM) codec by modifying the input signal under the analysis-by-synthesis framework. Modification of the input signal is performed such that the ADPCM codec causes less quantization error. When applied to the ITU-T G.726 ADPCM coder, the proposed algorithm improves the output signal-to-noise ratio up to 2.39 dB.

Published in:

Signal Processing Letters, IEEE  (Volume:13 ,  Issue: 3 )