scholarly journals Application of adaptive wavelet thresholding to recovery geoacoustic signal pulse waveforms

2021 ◽  
Vol 254 ◽  
pp. 02004
Author(s):  
Olga Lukovenkova
Keyword(s):  
Background Noise ◽  
Computational Experiment ◽  
Weather Condition ◽  
Single Pulse ◽  
Signal Pulse ◽  
Wavelet Thresholding ◽  
Adaptive Wavelet ◽  
Geoacoustic Emission ◽  
Signal Characteristics ◽  
Over Time

Recorded geoacoustic signals often contain noise and interference. Their appearance is caused by various reasons, e.g. of propagation environment heterogeneity, weather condition influence, human activity, etc. So, geoacoustic emission signals contain a persistent background noise that changes in intensity over time. This noise significantly distorts the geoacoustic pulse waveforms and thus complicates analysis of the signal characteristics. The article presents results of estimating the geoacoustic signal background noise. On the basis of these estimates, a method of adaptive wavelet thresholding is proposed to remove noise from the signal and recovery the single pulse waveforms. In conclusion, the results of a computational experiment are presented. They confirm effectiveness of using the chosen method for the geoacoustic signal preprocessing. The work was carried out as part of the implementation of the state task AAAA-A21-121011290003-0.

scholarly journals Baseline Adaptive Wavelet Thresholding Technique for sEMG Denoising

2011 ◽  
Author(s):  
L. Bartolomeo ◽  
M. Zecca ◽  
S. Sessa ◽  
Z. Lin ◽  
Y. Mukaeda ◽  
...  
Keyword(s):  
Wavelet Thresholding ◽  
Adaptive Wavelet

Stimulus Parameter Considerations and Individual Differences in Cutaneous Sensitivity to Electropulse Stimulation

1966 ◽  
Vol 23 (3_suppl) ◽  
pp. 1215-1222 ◽  
Author(s):  
R. L. Brown ◽  
R. A. Spern ◽  
K. Schmitt ◽  
A. Solomon
Keyword(s):  
Pain Threshold ◽  
Optimal Parameter ◽  
Single Pulse ◽  
Pulse Number ◽  
Body Region ◽  
Stimulus Parameter ◽  
Msec Duration ◽  
Parameter Values ◽  
Significant Support ◽  
Over Time

The two experiments described were concerned with defining the optimal parameter values for an electropulse stimulus and the extent of S differences. In Exp. I, touch and pain threshold variations were established on 12 Ss as a function of pulse number (1, 4, 8) and pulse duration (0.5, 1.0 msec). Significant support was obtained for use of a single pulse of 0.5-msec. duration. In Exp. II, touch and pain thresholds were obtained on 20 Ss coincident with body region and session variation. The abdomen and chest appear to be ideal electrode sites. S differences over time were discussed.

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