Results 221 to 230 of about 50,239 (261)

Distortion Reduction in Phase Modulation

IEEE Transactions on Aerospace and Electronic Systems, 1971
When a phase-modulated carrier of the form sin (wt+?) is multiplied by cos (wt), the recovered phase modulation is sin (?), which is a distorted version of . For small ?, the error is small, but is appreciable as A approaches unity or more. When ? is complicated (several subcarriers for example), the intermodulation can seriously degrade the system ...
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Distortion invariant pattern recognition with phase filters

Applied Optics, 1987
A 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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Phase Distortion in Telephone Apparatus*

Bell System Technical Journal, 1930
This paper shows that if, over its transmitting range, the phase shift, B, in radians, of a four-terminal network may be written B = a 0 + a 1 ω (ω = 2πx frequency in cycles per second), there is no phase distortion if a 0 = N, N being any integer. However, there is a delay, for any signal, given by dB/dω = a 1 (seconds).
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Signal-dependent phase distortion in optical correlators

Applied Optics, 1987
We 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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Phase distortion in operational amplifiers

Mathematics and Computers in Simulation, 1962
The stray capacities in the input and feedback paths of an operational amplifier, its finite bandwidth and d.c. gain effectively narrow the bandwidth of an amplifier causing amplitude and phase errors in the computer solutions. A given degree of accuracy consequently becomes more difficult to obtain with an amplifier when used in a high-speed ...
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Mechanisms for phase distortion in a traveling wave tube

Physical Review E, 2004
We present a view of the physics of phase distortion in a traveling wave tube (TWT) based on unique insights afforded by the MUSE models of a TWT [IEEE Trans. Plasma Sci. 30, 1063 (2002)]]. The conclusion, supported by analytic theory and simulations, is that prior to gain compression phase distortion is due to harmonic frequencies in the electron beam
John G, Wöhlbier, John H, Booske
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Comments on phase intercept distortion

Proceedings of the IEEE, 1968
This letter discusses phase intercept distortion as presented a previous letter. It also relates that presentation to another method which some readers may find more familiar.
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Tracking distortion as phase modulation

IEEE Transactions on Audio, 1963
In support of the urgency for establishing a standard for the vertical tracking angle in stereo disc recording, the phase perturbing character of tracking error distortion is shown, and used to calculate the phase and amplitude intermodulation distortion (PIM and AIM) and harmonic distortion arising from tracking errors. These results are compared with
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Measures and perception of phase distortion in electroacoustical systems

ICASSP '80. IEEE International Conference on Acoustics, Speech, and Signal Processing, 2005
Phase distortion and group delay distortion are defined. Examples are given indicating quantitative amounts of phase distortion produced by loudspeakers, anti-alias filters and analog magnetic recorders. A frequency-dependent tolerance on group delay distortion is developed based on numerous perceptual studies.
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Distorted Wave Approximation for Scattering Phase-Shifts

Nature, 1960
THE elastic scattering wave-function for a short-range potential function V(r) may be written in the form : where j l(x) and n l(x) are the spherical Bessel and Neumann functions respectively, δl is the scattering phase-shift, and g l(r) is a form factor measuring the distortion ...
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