Article (Scientific journals)
An efficient two-digit adaptive delta modulation for Laplacian source coding
Peric, Zoran; Denic, Bojan; DESPOTOVIC, Vladimir
2019In International Journal of Electronics, 106 (7), p. 1085-1100
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Keywords :
Delta modulation; predictive coding; speech coding; Laplacian source
Abstract :
[en] Delta Modulation (DM) is a simple waveform coding algorithm used mostly when timely data delivery is more important than the transmitted data quality. While the implementation of DM is fairly simple and inexpensive, it suffers from several limitations, such as slope overload and granular noise, which can be overcome using Adaptive Delta Modulation (ADM). This paper presents novel 2-digit ADM with six-level quantization using variable-length coding, for encoding the time-varying signals modelled by Laplacian distribution. Two variants of quantizer are employed, distortion-constrained quantizer which is optimally designed for minimal mean-squared error (MSE), and rate-constrained quantizer, which is suboptimal in the minimal MSE sense, but enables minimal loss in SQNR for the target bit rate. Experimental results using real speech signal are provided, indicating that the proposed configuration outperforms the baseline ADM algorithms, including Constant Factor Delta Modulation (CFDM), Continuously Variable Slope Delta Modulation (CVSDM), 2-digit and 2-bit ADM, and operates in a much wider dynamic range.
Disciplines :
Computer science
Author, co-author :
Peric, Zoran;  University of Nis > Faculty of Electronic Engineering
Denic, Bojan;  University of Nis > Faculty of Electronic Engineering
DESPOTOVIC, Vladimir ;  University of Belgrade > Technical Faculty in Bor
External co-authors :
yes
Language :
English
Title :
An efficient two-digit adaptive delta modulation for Laplacian source coding
Publication date :
March 2019
Journal title :
International Journal of Electronics
ISSN :
0020-7217
eISSN :
1362-3060
Publisher :
Taylor & Francis, United Kingdom
Volume :
106
Issue :
7
Pages :
1085-1100
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
Ministry of Education, Science and Technological Development of the Republic of Serbia
Available on ORBilu :
since 22 October 2019

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