Multichannel processing of vibrational measurements: A constrained subspace application

2019 ◽  
Vol 146 (4) ◽  
pp. 2350-2372 ◽  
Author(s):  
J. V. Candy ◽  
J. E. Case ◽  
K. A. Fisher ◽  
K. L. Eves ◽  
M. M. Foster ◽  
...  
Keyword(s):  
Multichannel Processing

Factors Ensuring Consistent Audibility in Pediatric Hearing Aid Fitting

2002 ◽  
Vol 13 (09) ◽  
pp. 503-520
Author(s):  
Francis Kuk ◽  
Andre Marcoux
Keyword(s):  
Hearing Loss ◽  
Hearing Aids ◽  
Hearing Aid ◽  
Precise Determination ◽  
Feedback Cancellation ◽  
Directional Microphones ◽  
Multichannel Processing ◽  
Important Objective ◽  
Fitting Hearing Aids

Ensuring consistent audibility is an important objective when fitting hearing aids to children. This article reviews the factors that could affect the audibility of the speech signals to children. These factors range from a precise determination of the child's hearing loss to an accurate specification of gain in the chosen hearing aids. In addition, hearing aid technology and features such as multichannel processing, directional microphones, and feedback cancellation that could affect the achievement of consistent audibility are reviewed.

THE POTENTIAL OF DIGITAL SEISMIC RECORDINGS FOR MULTICHANNEL PROCESSING

Geophysics ◽  
1970 ◽  
Vol 35 (3) ◽  
pp. 461-470 ◽  
Author(s):  
J. P. Lindsey
Keyword(s):  
Dynamic Range ◽  
Single Channel ◽  
Recording Equipment ◽  
Field Equipment ◽  
Reflection Data ◽  
Field Recording ◽  
Amplifier Gain ◽  
Multichannel Processing ◽  
New Processing ◽  
Processing Techniques

The availability of seismic digital field recording equipment has made possible new processing techniques which achieve significant reflection data enhancement. Typical of the processes that are now used routinely are deconvolution, autocorrelation and crosscorrelation, Fourier transformation, and spectral alteration. A recording fidelity that reduces errors to 1 part in 10,000 has provided the motive for developing and using these techniques. An additional capability of digital field equipment is the recording of amplifier gain information to a precision of 0.1 percent. This appears to provide a motive for developing multichannel processes which expand further our processing capabilities beyond the essentially single channel ones now in use. The present study evaluates the multichannel processing potential afforded by present day seismic digital field recording systems. The evaluation is based on measurement and computation of the effects of channel performance deviations. Each component of the field recording system (geophone, cable, amplifier, filters, sampling skew) separately, and the system as a whole, are evaluated in this context. Results of the study indicate that whereas any given channel possesses a dynamic range of 80 db, channel‐to‐channel variations establish a dynamic range of only 15 db. The 15 db range sets a serious limit on the performance of multichannel processes and points up the need for additional improvements in field hardware capabilities.

scholarly journals A New Concept of GPU-Accelerated On-Board Visual System for Aerial Vehicles

2020 ◽  
pp. 84-93
Author(s):  
Yevhenii (Eugene) A. SHKVAR ◽  
Zhechen Dai ◽  
Shi-ju E ◽  
Jian Cheng Cai
Keyword(s):  
Graphics Processing Unit ◽  
Intellectual Ability ◽  
Processing Unit ◽  
Multichannel System ◽  
Additional Element ◽  
Controlling System ◽  
Safety And Reliability ◽  
Multichannel Processing ◽  
Movement Parameters ◽  
Graphics Processing

As technology advances, the level of intellectual ability and autonomy of the electronic-mechanical control system of modern aircrafts and spacecrafts is constantly growing, which helps to reduce the crew load and accident rate. But these helpful controlling systems are not perfect, under some unfavorable circumstances they get stuck or start to function unpredictably when faced with a much more complicated real situation than the developers expected, sometimes even lead to crashes. The concept of visual multichannel processing support of aircraft/spacecraft launch and landing as an additional element of automatic control loop for flight safety and reliability improvement is proposed and its advantages, feasibility and expediency are discussed and evaluated. The visual analyzers are very typical for the overwhelming majority of highly organized organisms (humans, animals, insects) as the most informative source of control of movement parameters, so they potentially can effectively improve the reliability of the entire embedded vehicle controlling system and, at the same time, their principal structure, implementation and further functioning are very similar and universal for real flight operation of different vehicles, which opens up great prospects for their application in engineering based on modern revolutionary achievements in the field of methodology and computational technologies for pattern recognition. In particular, it was shown that the required for real vehicles accuracy and productivity can be reached in case of developing the visual multichannel system, as an additional source of flight state information, on the base of NVIDIA Jetson embedded portable low power consuming Graphics processing unit (GPU)-accelerated massively parallel computational platform, providing CUDA and Artificial Intelligence data processing in real-time mode.

Statistical multioffset phase analysis for surface-wave processing in laterally varying media

Geophysics ◽  
2011 ◽  
Vol 76 (2) ◽  
pp. U1-U11 ◽  
Author(s):  
Giulio Vignoli ◽  
Claudio Strobbia ◽  
Giorgio Cassiani ◽  
Peter Vermeer
Keyword(s):  
Data Quality ◽  
Phase Analysis ◽  
Dispersion Analysis ◽  
Lateral Resolution ◽  
Propagation Mode ◽  
Standard Procedures ◽  
Multichannel Processing ◽  
Lateral Variations ◽  
Selection Of

Standard procedures for dispersion analysis of surface waves use multichannel wavefield transforms. By using several receivers, such procedures integrate the information along the entire acquisition array. That approach improves data quality and robustness significantly, but its side effects are spatial averaging and loss of lateral resolution. Recently, a new approach was developed to address that issue and maximize lateral resolution. The new method uses multioffset phase analysis to detect and locate sharp lateral variations in velocity. By using the phase analysis approach, the number of usable channels can be maximized, thereby gaining data quality without compromising lateral resolution. In fact, such preliminary data analysis also allows selection of the appropriate traces on which to perform multichannel processing. Such multioffset phase analysis can be enhanced by f-k filtering, which assures the selection of only one wave-propagation mode, and by a statistical analysis that takes advantage of data redundancy of multishot data, usually collected, for example, in land refraction surveys. Moreover, this novel statistical method with f-k filtering can be used to retrieve a dispersion curve, in principle, for each receiver location. The quasi-continuous pseudoimage of shear-wave velocity as a function of offset and frequency allows a characterization of lateral variations in velocity, whether they are sharp or smooth.

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