Title :
Signal modification for ADPCM based on analysis-by-synthesis framework
Author :
Shin, Jong Won ; Kim, Nam Soo
Author_Institution :
Sch. of Electr. Eng., Seoul Nat. Univ., South Korea
fDate :
3/1/2006 12:00:00 AM
Abstract :
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.
Keywords :
adaptive modulation; code standards; differential pulse code modulation; modulation coding; quantisation (signal); signal processing; speech codecs; speech coding; speech synthesis; ITU-T G.726 ADPCM codec; adaptive differential pulse code modulation; analysis-by-synthesis framework; quantization; signal modification; speech codec; Algorithm design and analysis; Codecs; Decoding; Modulation coding; Performance analysis; Pulse modulation; Signal analysis; Signal synthesis; Signal to noise ratio; Speech analysis; Adaptive differential pulse code modulation (ADPCM); analysis by synthesis; signal modification; speech codecs;
Journal_Title :
Signal Processing Letters, IEEE
DOI :
10.1109/LSP.2005.862599
