DocumentCode :
555882
Title :
Reduction of the measurement time required for high accuracy waveform acquisition by employing digital filtering instead of averaging
Author :
Yin, He ; Afaneh, A. ; Kalashnikov, A.N.
Author_Institution :
Dept. of Electr. & Electron. Eng., Nottingham Univ., Nottingham, UK
Volume :
1
fYear :
2011
fDate :
15-17 Sept. 2011
Firstpage :
450
Lastpage :
456
Abstract :
High accuracy data acquisition frequently employs averaging in order to improve the signal-to-noise ratio (SNR) of the output signal. Averaging requires acquisition of several copies of a noisy input signal that results in an increase in the measurement time, and is applicable for the periodic processes only. The SNR can alternatively be improved by digital filtering of out-of-the-signal-band noise, especially when the sampling frequency was selected significantly higher than the notional Nyquist frequency (oversampling). A quantitative assessment of the applicability of this approach to high accuracy data acquisition was tested using an ultrasonic nondestructive evaluation (NDE) dataset of 1000 noisy records. Five different FIR filters were designed including two ideal filters defined in the frequency domain, and three realizable filters. It was found that the relative total mean square error filter exhibited the performance closest to that of the ideal Wiener filter. The achieved improvements for two realizable filters were above 6 dB meaning that by using FIR filtering the required measurement time could be reduced by a factor of 4 in the considering case.
Keywords :
FIR filters; Wiener filters; data acquisition; digital filters; mean square error methods; FIR filters; Nyquist frequency; Wiener filter; digital filtering; frequency domain; high accuracy waveform acquisition; mean square error filter; measurement time reduction; out-of-the-signal-band noise; quantitative assessment; realizable filters; signal-to-noise ratio; ultrasonic nondestructive evaluation; Accuracy; Chebyshev approximation; Finite impulse response filter; Noise; Wiener filter; averaging; digital filtering; high accuracy data acquisition; measurement time; ultrasonic NDE;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Intelligent Data Acquisition and Advanced Computing Systems (IDAACS), 2011 IEEE 6th International Conference on
Conference_Location :
Prague
Print_ISBN :
978-1-4577-1426-9
Type :
conf
DOI :
10.1109/IDAACS.2011.6072794
Filename :
6072794
Link To Document :
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