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Mathematical Problems in Engineering
Volume 2014, Article ID 947052, 12 pages
http://dx.doi.org/10.1155/2014/947052
Research Article

Information Entropy- and Average-Based High-Resolution Digital Storage Oscilloscope

School of Automation Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China

Received 21 June 2014; Accepted 27 August 2014; Published 25 September 2014

Academic Editor: Guangming Xie

Copyright © 2014 Jun Jiang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Vertical resolution is an essential indicator of digital storage oscilloscope (DSO) and the key to improving resolution is to increase digitalizing bits and lower noise. Averaging is a typical method to improve signal to noise ratio (SNR) and the effective number of bits (ENOB). The existing averaging algorithm is apt to be restricted by the repetitiveness of signal and be influenced by gross error in quantization, and therefore its effect on restricting noise and improving resolution is limited. An information entropy-based data fusion and average-based decimation filtering algorithm, proceeding from improving average algorithm and in combination with relevant theories of information entropy, are proposed in this paper to improve the resolution of oscilloscope. For single acquiring signal, resolution is improved through eliminating gross error in quantization by utilizing the maximum entropy of sample data with further noise filtering via average-based decimation after data fusion of efficient sample data under the premise of oversampling. No subjective assumptions and constraints are added to the signal under test in the whole process without any impact on the analog bandwidth of oscilloscope under actual sampling rate.