scholarly journals Temporal Coding of Speech Information for Cochlear Implant Patients

1987 ◽  
Vol 96 (1_suppl) ◽  
pp. 62-64 ◽  
Author(s):  
J. B. Millar ◽  
L. F. A. Martin ◽  
Y. C. Tong ◽  
G. M. Clark
Keyword(s):  
Time Domain ◽  
Speech Processing ◽  
Excitation Frequency ◽  
Temporal Coding ◽  
Strongly Correlated ◽  
Initial Strategy ◽  
The Time Domain ◽  
Speech Information ◽  
Clinical Experiment

A modified speech-processing strategy incorporating the temporal coding of information strongly correlated with the first formant of speech was evaluated in a long-term clinical experiment with a single patient. The aim was to assess whether the patient could learn to extract information from the time domain in addition to the time domain cues for voice excitation frequency already received from the initial strategy. It was found that the patient gained no significant advantage from the modified strategy, but there was no disadvantage either, and the patient expressed a preference for the modified strategy for everyday use.

Long-Term Fatigue Analysis of Deepwater Risers in the Time Domain

2014 ◽  
Author(s):  
Yidan Gao ◽  
Ying Min Low
Keyword(s):  
Time Domain ◽  
Time Domain Analysis ◽  
Fatigue Analysis ◽  
Sea State ◽  
Need To Evaluate ◽  
Nature Of Time ◽  
The Time Domain ◽  
Computational Difficulty ◽  
Deepwater Risers

A floating production system is exposed to many different environmental conditions over its service life. Consequently, the long-term fatigue analysis of deepwater risers is computationally demanding due to the need to evaluate the fatigue damage from a multitude of sea states. Because of the nonlinearities in the system, the dynamic analysis is often performed in the time domain. This further compounds the computational difficulty owing to the time consuming nature of time domain analysis, as well as the need to simulate a sufficient duration for each sea state to minimize sampling variability. This paper presents a new and efficient simulation technique for long-term fatigue analysis. The results based on this new technique are compared against those obtained from the direct simulation of numerous sea states.

scholarly journals Spatial Characteristics of Wideband Channels Using Leaky Coaxial Cables in Tunnel Scenario

2019 ◽  
Vol 2019 ◽  
pp. 1-10
Author(s):  
Asad Saleem ◽  
Min Wang ◽  
Guoxin Zheng ◽  
Xiaoyu Yin
Keyword(s):  
Time Domain ◽  
Angular Spread ◽  
Multimode Waveguide ◽  
Propagation Characteristics ◽  
Angular Dispersion ◽  
Wideband Channels ◽  
Term Evolution ◽  
Power Azimuth Spectrum ◽  
The Time Domain

This paper presents the spatial domain and propagation characteristics of different wideband channels using leaky coaxial cables (LCXs) for underground environment at 1.8GHz corresponding to the Long Term Evolution for Metro (LTE-M) standards. Angular dispersion of the signal significantly affects the channel capacity, and it can be exactly predicted in both the near and far fields for underground environments by means of a multimode waveguide. A ray tracing phenomenon was exploited to visualize the wave propagation for different transmitter and receiver antenna distances by using the time domain approach for both the horizontally and vertically polarized LCXs. In order to achieve this goal, we characterized the power azimuth spectrum (PAS) and power angle profile (PAP) for different tunnel dimensions and found that the PAS can be demonstrated by a zero-mean Gaussian distribution whose angular spread (AS) is dependent on the transmitter-receiver distances and the tunnel dimensions. The results demonstrate that the horizontally polarized LCX has higher angular spread values than the vertically polarized one, and the correlation coefficient follows the decreasing function with the increment of angular spread.

scholarly journals The Future of the Time Domain with LSST

2011 ◽  
Vol 7 (S285) ◽  
pp. 158-158
Author(s):  
Lucianne M. Walkowicz
Keyword(s):  
Time Domain ◽  
Survey Design ◽  
Ancillary Data ◽  
Event Identification ◽  
Scientific Investigations ◽  
The Time Domain ◽  
First Time

SummaryIn the coming decade LSST's combination of all-sky coverage, consistent long-term monitoring and flexible criteria for event identification will revolutionize studies of a wide variety of astrophysical phenomena. Time-domain science with LSST encompasses objects both familiar and exotic, from classical variables within our Galaxy to explosive cosmological events. Increased sample sizes of known-but-rare observational phenomena will quantify their distributions for the first time, thus challenging existing theories. Perhaps most excitingly, LSST will provide the opportunity to sample previously untouched regions of parameter space. LSST will generate ‘alerts’ within 60 seconds of detecting a new transient, permitting the community to follow up unusual events in greater detail. However, follow-up will remain a challenge as the volume of transients will easily saturate available spectroscopic resources. Characterization of events and access to appropriate ancillary data (e.g. from prior observations, either in the optical or in other passbands) will be of the utmost importance in prioritizing follow-up observations. The incredible scientific opportunities and unique challenges afforded by LSST demand organization, forethought and creativity from the astronomical community. To learn more about the telescope specifics and survey design, as well as obtaining a overview of the variety of the scientific investigations that LSST will enable, readers are encouraged to look at the LSST Science Book: http://www.lsst.org/lsst/scibook. Organizational details of the LSST science collaborations and management may be found at http://www.lsstcorp.org.

Speech-Processing Strategies and Their Implementation

1987 ◽  
Vol 96 (1_suppl) ◽  
pp. 71-74 ◽  
Author(s):  
P. Seligman
Keyword(s):  
Cochlear Implant ◽  
Pulse Rate ◽  
Speech Processing ◽  
Temporal Coding ◽  
Electrode Position ◽  
Processing Strategy ◽  
Limited Information ◽  
Processing Strategies ◽  
Speech Information

Since 1979, the Australian speech-processing strategy has been based on the presentation of an estimate of F2 coded by electrode position and F0 coded by pulse rate. Although providing limited information, this strategy has produced good results with significant hearing-alone performance. This paper describes a number of strategies that provide further speech information in an attempt to increase hearing-alone performance to a level where the cochlear implant is able to operate in its own right rather than as an adjunct to lipreading. The strategies are all based on the addition of F1 to the existing strategy. Both electrode and temporal coding of F1 is described, and the performance and percepts produced are discussed. Amplitudes of the two formants must be carefully controlled to avoid masking. The implications of the strategies on the design of hardware are described.

scholarly journals Analysis of Longitudinal Guided Wave Propagation in a Liquid-Filled Pipe Embedded in Porous Medium

2021 ◽  
Vol 11 (5) ◽  
pp. 2281
Author(s):  
Nana Su ◽  
Qingbang Han ◽  
Yu Yang ◽  
Minglei Shan ◽  
Jian Jiang
Keyword(s):  
Porous Medium ◽  
Time Domain ◽  
Saturated Porous Medium ◽  
Guided Wave ◽  
Guided Wave Propagation ◽  
Partial Mode ◽  
The Media ◽  
The Time Domain ◽  
Good Agreement

To study the leakage situation of a liquid-filled pipe in long-term service, a model of a liquid-filled pipe embedded in an infinite porous medium as well as in a finite porous medium is designed. The principal motivation is to perform detailed quantitative analysis of the longitudinal guided wave propagating in a liquid-filled pipe embedded in a saturated porous medium. The problems of pipeline leakage and porosity as well as the media outside the pipe are solved to identify the characteristics of the guided wave in a more practical model. The characteristics of the guided wave are investigated theoretically and numerically, with special emphasis on the influence of porous medium parameters on the dispersion properties. Assuming the pipe is a cylindrical shell buried in an isotropic, homogeneous, and porous medium, the dispersion equations are established based on the elastic-dynamic equations and the modified Biot liquid-saturated porous theory. The characteristics of dispersion, time-domain waveform and attenuation curves varying with porous medium parameters, wrapping layer material, and thickness, are all analyzed. The increase in porosity decreases the partial mode phase velocity in the liquid-filled pipe embedded in the finite porous medium. The characteristics of attenuation are in good agreement with the dispersion curves and the time-domain waveform results.

scholarly journals Multi-Scale Group Transformer for Long Sequence Modeling in Speech Separation

2020 ◽  
Author(s):  
Yucheng Zhao ◽  
Chong Luo ◽  
Zheng-Jun Zha ◽  
Wenjun Zeng
Keyword(s):  
Time Domain ◽  
Single Channel ◽  
Sequence Length ◽  
Separation Performance ◽  
Speech Separation ◽  
Convolutional Network ◽  
Multi Scale ◽  
Sequence Modeling ◽  
The Time Domain

In this paper, we introduce Transformer to the time-domain methods for single-channel speech separation. Transformer has the potential to boost speech separation performance because of its strong sequence modeling capability. However, its computational complexity, which grows quadratically with the sequence length, has made it largely inapplicable to speech applications. To tackle this issue, we propose a novel variation of Transformer, named multi-scale group Transformer (MSGT). The key ideas are group self-attention, which significantly reduces the complexity, and multi-scale fusion, which retains Transform's ability to capture long-term dependency. We implement two versions of MSGT with different complexities, and apply them to a well-known time-domain speech separation method called Conv-TasNet. By simply replacing the original temporal convolutional network (TCN) with MSGT, our approach called MSGT-TasNet achieves a large gain over Conv-TasNet on both WSJ0-2mix and WHAM! benchmarks. Without bells and whistles, the performance of MSGT-TasNet is already on par with the SOTA methods.

THE MEASUREMENT OF SOIL WATER CONTENT USING A PORTABLE TDR HAND PROBE

1984 ◽  
Vol 64 (3) ◽  
pp. 313-321 ◽  
Author(s):  
G. C. TOPP ◽  
W. D. ZEBCHUK ◽  
J. L. DAVIS ◽  
W. G. BAILEY
Keyword(s):  
Water Content ◽  
Transmission Lines ◽  
Time Domain ◽  
Surface Soil ◽  
Time Domain Reflectometry ◽  
Volumetric Water Content ◽  
Separate Experiment ◽  
Parallel Transmission ◽  
The Time Domain

The time-domain reflectrometry (TDR) technique had previously been shown to measure the volumetric water content of soil accurately when applied to long-term installations of parallel transmission lines. In this study a hand probe was used with a portable TDR instrument to measure water content of soil down the wall of soils pits to a depth greater than 1 m. In a separate experiment the water content of the surface soil at two sites was measured repeatedly in increasing depth increments of 50 mm to 300 mm. The TDR measured values were compared with values obtained by a gravimetric determination on a sample of soil. The TDR gave values that were calculated at the time of measurement in the field. TDR measured values were as accurate and precise as those from gravimetric samples. Key words: Volumetric water content, soil, time domain reflectometry

scholarly journals Removing Ocular Movement Artefacts by a Joint Smoothened Subspace Estimator

2007 ◽  
Vol 2007 ◽  
pp. 1-13 ◽  
Author(s):  
Ronald Phlypo ◽  
Paul Boon ◽  
Yves D'Asseler ◽  
Ignace Lemahieu
Keyword(s):  
Time Domain ◽  
Lower Order ◽  
Statistical Models ◽  
Predictive Power ◽  
Simulated Data ◽  
Short Term ◽  
Ocular Movement ◽  
The Time Domain ◽  
Electroencephalogram Eeg

To cope with the severe masking of background cerebral activity in the electroencephalogram (EEG) by ocular movement artefacts, we present a method which combines lower-order, short-term and higher-order, long-term statistics. The joint smoothened subspace estimator (JSSE) calculates the joint information in both statistical models, subject to the constraint that the resulting estimated source should be sufficiently smooth in the time domain (i.e., has a large autocorrelation or self predictive power). It is shown that the JSSE is able to estimate a component from simulated data that is superior with respect to methodological artefact suppression to those of FastICA, SOBI, pSVD, or JADE/COM1 algorithms used for blind source separation (BSS). Interference and distortion suppression are of comparable order when compared with the above-mentioned methods. Results on patient data demonstrate that the method is able to suppress blinking and saccade artefacts in a fully automated way.

Apodisation in the time domain

1992 ◽  
Vol 2 (4) ◽  
pp. 615-620
Author(s):  
G. W. Series
Keyword(s):  
Time Domain ◽  
The Time Domain
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