Results 111 to 120 of about 104,044 (167)
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PHASE INSTABILITIES OF DISTORTED HEXAGONAL PATTERNS
International Journal of Bifurcation and Chaos, 2001We present an analytical study on the stability of distorted hexagonal patterns. From a general amplitude equation we calculate the instabilities with respect to homogeneous and longwave perturbations. The latter lead to the phase equations that permit to determine the stability regions. Slightly squeezed hexagons are locally stable in a full range of
Peña, B., Pérez-García, C.
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Phase Distortion and Phase Distortion Correction
Bell System Technical Journal, 1928The importance of the rocle played by the steady state phase characteristics of long cable circuits has recently been emphasized in telephone and telegraph transmission. In this paper an analytical exposition of the theory of phase distortion is followed by a consideration of various methods of phase distortion correction with particular reference to ...
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Measurement of Phase Distortion*
Bell System Technical Journal, 1930This paper deals with the measurement of phase distortion or delay distortion and is particularly concerned with measurements on telephone circuits. For this purpose, use is made of a quantity defined as “envelope delay,” which is the first derivative of the phase shift with respect to frequency.
H. Nyquist, S. Brand
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Correcting phase distortion of phase shifting method
The 1st IEEE Global Conference on Consumer Electronics 2012, 2012We propose a method of correcting phase distortion which is caused when measuring any objects by phase shifting method with an ordinary projector. We have measured some objects with the projector which is commercially available [1]. In this paper, we try to improve the precision with the proposing method.
Tsukasa Kato +3 more
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Phase Distortion of Averaged Electroencepha
Archives of Otolaryngology - Head and Neck Surgery, 1974Analog filters employed in most averaged electroencephalic response (AER) recording systems impose some phase distortion on recorded AER. Phase distortion of the response results in a real time shift of peak latencies. The extent of this distortion, in general, is determined by the cutoff frequencies of the filter band in relation to the spectrum of ...
R. H. Lane +5 more
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Phase Distortion Study (Phase B)
1977Abstract : This is the Final Report of a 6 month study of duobinary digital data transmission over the DSCS. Analysis and computer simulations were developed for evaluating the degradation for duobinary SQPSK in the FDMA and TDMA modes, with emphasis on maximizing the bandwidth utilization capability of duobinary signalling. In a linear channel, single-
C. L. May, C. R. Cahn
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Composite pulses without phase distortion
Journal of Magnetic Resonance (1969), 1985Abstract Composite pulses for broadband spin excitation over large ranges of radiofrequency field amplitudes and resonance offsets are presented. They are derived according to a previously presented method based on the Magnus expansion in the manner of coherent averaging theory. It is shown theoretically and in simulations that these composite pulses
R Tycko, H.M Cho, E Schneider, A Pines
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Signal-dependent phase distortion in optical correlators
Applied Optics, 1987We examine the effect of phase distortion inherent in a spatial light modulator on the performance of an optical correlator. We examine such areas as input plane distortion, input and Fourier plane distortion, effect of phase mismatch between these planes, and the effect of additive white noise.
J L, Horner, P D, Gianino
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Distortion invariant pattern recognition with phase filters
Applied Optics, 1987A recently developed approach for pattern recognition using spatial filters with reduced tolerance requirements is employed for the generation of filters containing mainly phase information. As anticipated, the recognition levels were decreased, but they remain adequate for unambiguous identification together with appreciable amounts of distortion ...
J, Rosen, J, Shamir
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International Journal of Circuit Theory and Applications, 1986
AbstractMeasures exclusively reflecting phase distortion are examined and a new phase distortion ‘index’ is proposed. This index, based on the mean‐squared degradation in the impulse response of a filter, is shown to be equivalent to a phase distortion ‘spot‐measure’ using the variation in the peak value of the impulse response, due to phase distortion,
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AbstractMeasures exclusively reflecting phase distortion are examined and a new phase distortion ‘index’ is proposed. This index, based on the mean‐squared degradation in the impulse response of a filter, is shown to be equivalent to a phase distortion ‘spot‐measure’ using the variation in the peak value of the impulse response, due to phase distortion,
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