Results 251 to 260 of about 1,968,691 (295)

Toward quantification of athetotic movements by frequency spectrum analysis

Journal of Biomechanics, 1985
The frequency spectrum of the elbow movements of one normal subject and six handicapped subjects were obtained in order to investigate the possibility of using this technique in quantifying athetosis. The frequency spectrum technique appears to be useful but data from more subjects must be obtained and specific details regarding scaling need to be ...
S, Niku, J M, Henderson
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Frequency- Wavenumber Spectrum Analysis of EEG Multielectrode Array Data

IEEE Transactions on Biomedical Engineering, 1974
Electroencephalographic (EEG) data consisting of visual evoked responses monitored via an array of electrodes from humans and penicillin-induced focal epileptic discharge data recorded from rat neocortex are analyzed. This procedure, previously applied to seismic array data, offers a method by which high-resolution vector velocity and, thus, direction ...
L J, Pinson, D G, Childers
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Observational Data: Analysis of the Frequency Spectrum

2017
This chapter is an analysis of the frequency-power spectrum. It first discusses the probabilistic methods for detecting signatures of individual modes in the spectrum, including schemes that incorporate a Bayesian framework for the analysis. The chapter then turns to the automated detection of the ensemble signatures of the oscillations.
Sarbani Basu, William J. Chaplin
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POWER-SPECTRUM ANALYSIS OVER LARGE RANGES OF FREQUENCY

Journal of Meteorology, 1956
Abstract It is shown that a spectrum covering a large range of frequencies can be found by superposing estimates of spectra of means over periods of different lengths. The method is illustrated by the power spectrum of temperature at University Park, Pennsylvania, covering periods from 2 to 7300 days.
H. L. Griffith, H. A. Panofsky, I. Van der Hoven   +2 more
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Frequency-wavenumber spectrum analysis using quadratic estimators

[1992] IEEE Sixth SP Workshop on Statistical Signal and Array Processing, 2003
A general representation for all non-negative, modulation invariant estimators of the frequency-wavenumber spectrum shows explicitly how the quadratic estimates are constructed from linear transformations of the array data. The windows associated with these transformations are those normally associated with 'classical' spectrum estimators.
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Spectrum analysis using frequency-domain adaptive windowing

ICASSP '78. IEEE International Conference on Acoustics, Speech, and Signal Processing, 2005
An adaptive spectral windowing algorithm has been developed to solve the leakage problem that occurs when the discrete Fourier transform is used to estimate spectra. In contrast to fixed windows presently employed in spectral analysis, the algorithm uses actual spectral data to yield an optimum window.
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Extended fractal analysis of sea clutter frequency spectrum

IET International Radar Conference 2013, 2013
Extended self-similar (ESS) process, as a generalized fractional Brownian motion (fBm) process, characterizes rough surfaces by a series of extended Hurst exponents instead of one single Hurst parameter that is used in the fBm process. So the ESS process is able to provide more clues about the local roughness of the surface at different scales. In this
null Wang Guo-Qing, null Liu Ning-Bo, null Bao Zhong-Hua, null Guan Jian   +3 more
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Comments on "High-resolution frequency-wavenumber spectrum analysis"

Proceedings of the IEEE, 1970
Capon has described an estimator that can be used to discriminate between wavefronts incident upon an array of sensors from different directions. It is shown here that for a received field consisting of a single "signal" wavefront and an uncorrelated "noise" component, Capon's estimator displays less angular resolution than the conventional estimator ...
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Singular Spectrum Analysis-Based Time Domain Frequency Filtering

2020
The SVD-based time and frequency domain Eigen image and Cadzow filters were compared and discussed in the previous chapter for random noise attenuation based on coherency of signal. The time domain frequency filtering of seismic traces using Singular Spectrum Analysis (SSA) method, a data adaptive time domain filtering mechanism, is presented in this ...
R. K. Tiwari, R. Rekapalli
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Audio frequency spectrum analysis using MOS memory elements

IEEE Transactions on Audio and Electroacoustics, 1970
The speed of present-day logic elements is such that it is possible to effect real-time spectrum analysis of audio frequency signals by means of digital hardware. This paper describes a structure that computes the discrete Fourier transform of a 400-point time sequence in 10 ms.
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