Results 121 to 130 of about 104,044 (167)
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Phase series echography with prior waveform distortion for evaluating posterior waveform distortion
IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control, 2006We describe a pulse-echo ultrasound method for measuring nonlinear waveform distortion. First, two artificially distorted ultrasound pulses, one of which is transformed into the other by using a linear transform, are prepared prior to the measurement. The linear relationship does not hold for nonlinear propagation.
Ayumu, Matani, Takayuki, Shigeno
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Distortion Reduction in Phase Modulation
IEEE Transactions on Aerospace and Electronic Systems, 1971When 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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Phase Distortion in Telephone Apparatus*
Bell System Technical Journal, 1930This 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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Phase distortion in operational amplifiers
Mathematics and Computers in Simulation, 1962The 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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Composite Pulse NMR with Phase Distortion
Spectroscopy Letters, 1996Abstract A phase-distorting composite pulse NMR method is described. In the calculation, it only uses function Z22, representing the Wigner rotation matrix elements. The optimum composite pulse sequence parameters were obtained by minimizing the pulse angles and phase distortion effects, this new route could greatly save computing time and efforts ...
Xujie Yang +5 more
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Comments on phase intercept distortion
Proceedings of the IEEE, 1968This 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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Nonlinear Distortions in EO Phase Modulators
IEEE Photonics Technology Letters, 2012Nonlinear distortions induced by a voltage-dependent guided-mode field in electro-optical phase modulators are measured and quantified for the first time. Such distortions are shown to impact analog link performance under large-signal modulation.
Robert Tavlykaev +3 more
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Low-frequency phase distortion of speech recordings
The Journal of the Acoustical Society of America, 1975Low-frequency phase distortion introduced by good quality audio tape recorders causes large errors in the reproduced waveform. It is advocated that a low-frequency rectangular wave should always precede the speech on recordings intended for wide distribution, so that the correct phase relationships of spectrum components can be identified.
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Tracking distortion as phase modulation
IEEE Transactions on Audio, 1963In 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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Distorted Wave Approximation for Scattering Phase-Shifts
Nature, 1960THE 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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