SeismicWaveTool: Continuous and discrete wavelet analysis and filtering for multichannel seismic data

Galiana-Merino, Juan José; Rosa-Herranz, Julio; Rosa-Cintas, S.; Martinez-Espla, J.J.

doi:10.1016/j.cpc.2012.08.008

Cited by 21 publications

(16 citation statements)

References 23 publications

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“…According to these frequency characteristics, in this work we have applied a 5 th -order band-pass Butterworth filter between 30 and 40 kHz in order to enhance this secondary peak respecting to the main one and follow their evolution (in amplitude and frequency) along the subsequent load tests (Galiana-Merino et al, 2013).…”

Section: Ultrasonic Analysis In Frequency-domainmentioning

confidence: 99%

Ultrasonic and X-ray computed tomography characterization of progressive fracture damage in low-porous carbonate rocks

Martı́nez-Martı́nez

Fusi²,

Galiana-Merino

et al. 2016

Engineering Geology

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This paper studies the fracturing process in low-porous rocks during uniaxial compressive tests considering the original defects and the new mechanical cracks in the material. For this purpose, five different kind of rocks have been chosen with carbonate mineralogy and low porosity (lower than 2%). The characterization of the fracture damage is carried out using three different techniques: ultrasounds, mercury porosimetry and X-ray computed tomography. The proposed methodology allows quantifying the evolution of the porous system as well as studying the location of new cracks in the rock samples.Intercrystalline porosity (the smallest pores with pores radius < 1 µm) shows a limited development during loading, disappearing rapidly from the porosimetry curves and it is directly related to the initial plastic behaviour in the stress-strain patterns. However, the biggest pores (corresponding to the cracks) suffer a continuous enlargement until the unstable propagation of fractures. The measured crack initiation stress varies between 0.25· p and 0.50· p for marbles and between 0.50· p and 0.85· p for micrite limestone. The unstable propagation of cracks is assumed to occur very close to the peak strength. Crack propagation through the sample is completely independent of pre-existing defects (porous bands, stylolites, fractures and veins). A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT 2The ultrasonic response in the time-domain is less sensitive to the fracture damage than the frequency-domain. P-wave velocity increases during loading test until the beginning of the unstable crack propagation. This increase is higher for marbles (between 15% and 30% from initial vp values) and lower for micrite limestones (between 5% and 10%). When the mechanical cracks propagate unstably, the velocity stops to increase and decreases only when rock damage is very high. Frequency analysis of the ultrasonic signals shows clear changes during the loading process. The spectrum of treated waveforms shows two main frequency peaks centred at low ( 20 kHz) and high ( 35 kHz) values. When new fractures appear and grow the amplitude of the high-frequency peak decreases, while that of the low-frequency peak increases. Besides, a slight frequency shift is observed towards higher frequencies.

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Section: Ultrasonic Analysis In Frequency-domainmentioning

confidence: 99%

Ultrasonic and X-ray computed tomography characterization of progressive fracture damage in low-porous carbonate rocks

Martı́nez-Martı́nez

Fusi²,

Galiana-Merino

et al. 2016

Engineering Geology

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“…Discrete Wavelet and Multiwavelet transform given a good indication in applications of signal processing. Recent work on Multiwavelet have been studies the basic theory, methods of constructing new multifilters and the denoising and compression applications in of video and image [17,18,19,22].The computation methods of 1, 2 and 3D of DWT are shown in [17,20,22,23,24,25] also 1 and 2D of DMWTCS are shown [18,24,25] and 3D-DMWTCS shown below.…”

Section: Computation Methods Of 3d-dwt and 3d-dmwtcsmentioning

confidence: 99%

“…In term of security system, the concept of the residual of intelligibility while the quality of the recovered data are subjective quantity, thus the scramble and descramble process techniques are estimated on the results of expert listeners during the test [22,23]. The tests were made tighter by adopting the following steps: 1.…”

Section: Proposed Secure Wireless Transceiversmentioning

confidence: 99%

Secure GPRS Data Systems Based on 3D-Discrete Wavelet and Multiwavelet Transformations

Abdul-Rahaim¹

2015

AJESA

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This paper shows a new efficient data delivery method based on three dimensional discrete Multiwavelet transformations Critically Sampled (3D-DMWTCS). This method was been done by get the data from any data source then catted the stream data to a packets of A certain length then each of these packet will convert to a square matrix, and then collected these square matrices in three dimensional matrix form. The 3D-discrete Multiwavelet transforms Critically Sampled (3D-DMWTCS) will be applied to each three dimensional matrix form and the output of this procedure will be also in three dimensional matrix forms and contain 3D-DMWTCS coefficient as real numbers. After this stage, the 3D matrix will be converting to square matrix and then to serial data stream of samples, then will be sending through USB port to SIM908 GSM GPRS module that must secure a connection between two or more communication points. As well as this encryption method can be done using three dimensional discrete wavelet transformations (3D-DWT) and (2D-DMWTCS) and (2D-DWT). The purposed of these methods is to maintain the confidentiality of the information sent, whether it is written texts, or data, or talk speech, and it is done with a high data rate and excellent coding. It is impossible or difficult to decrypt these methods without knowing how these encryption systems are build. The decryption is done by extracting the encrypted data from the Multiwavelet decomposition vector using the algorithm of inverse of 3D-Discrete Multiwavelet Transformation. The encrypted messages that send to other points consists 3D-DMWTCS decomposition vector. The encryption key that used in this method is 3D-DMWTCS method so the decryption key will be 3D-IDMWTCS. Due to the GSM GPRS mobile communications systems mostly use OFDM technology, therefore these technology has been used in the designed of wireless communication transceivers system using MATLAB2014a to simulate GSM GPRS under multichannel types and run the simulations to determine the specifications of these cryptographic systems under various conditions. The simulation results proved that these methods are retrieving the security and improve the performance of the communications system.

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“…Especially in the case of strong noise, the traditional Fourier transform is difficult to deal with the weak signal in the background of strong noise under the premise of ensuring high fidelity. Recently, some scholars have proposed a non-linear method of wavelet threshold [ 1 , 2 ], but the wavelet basis function is fixed, thus it cannot match all real signals. To be precise, wavelet analysis does not have the characteristics of self-adaptation.…”

Section: Introductionmentioning

confidence: 99%

Weak Signal Enhance Based on the Neural Network Assisted Empirical Mode Decomposition

Chen

Xie

Wen

et al. 2020

Sensors

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In order to enhance weak signals in strong noise background, a weak signal enhancement method based on EMDNN (neural network-assisted empirical mode decomposition) is proposed. This method combines CEEMD (complementary ensemble empirical mode decomposition), GAN (generative adversarial networks) and LSTM (long short-term memory), it enhances the efficiency of selecting effective natural mode components in empirical mode decomposition, thus the SNR (signal-noise ratio) is improved. It can also reconstruct and enhance weak signals. The experimental results show that the SNR of this method is improved from 4.1 to 6.2, and the weak signal is clearly recovered.

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SeismicWaveTool: Continuous and discrete wavelet analysis and filtering for multichannel seismic data

Cited by 21 publications

References 23 publications

Ultrasonic and X-ray computed tomography characterization of progressive fracture damage in low-porous carbonate rocks

Ultrasonic and X-ray computed tomography characterization of progressive fracture damage in low-porous carbonate rocks

Secure GPRS Data Systems Based on 3D-Discrete Wavelet and Multiwavelet Transformations

Weak Signal Enhance Based on the Neural Network Assisted Empirical Mode Decomposition

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