jitter

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jitter

(jĭt'ĕr),
The random variability of the cycle-to-cycle duration of vocal fold vibration; contributes to the perception of a rough or harsh voice quality.
Farlex Partner Medical Dictionary © Farlex 2012
Imaging Low amplitude irregularities in echo location on an ultrasound display, attributed to electronic noise, mechanical disturbances, and other nonspecific variables
Physiology Muscle jitter The normal electric variability—‘chaos’—measured by single-fiber EMG—in the interval between 2 action potentials of successive discharges of the same single muscle fiber in the same motor unit; jitter is characterised as instability in subcomponents of motor unit action potentials, and is due to the variation in the synaptic delay at the branch points in the distal axon and at the neuromuscular junction; like fiber density, jitter is increased in neuropathic conditions (motor neuron diseases)—e.g., myasthenia gravis—is accompanied by denervation and reinnervation, and attributed to inefficient transmission of impulses in recent neural collaterals, or due to blocking—abnormal neuromuscular transmission; it is normal or near-normal in myopathic disease
Psychology See Jitters
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.

jitter

Imaging Low amplitude irregularities in echo location on an ultrasound display, attributed to electronic noise, mechanical disturbances, and other variables Neurophysiology Muscle jitter The normal electric variability–'chaos'–measured by single-fiber EMG–in the interval between 2 action potentials of successive discharges of the same single muscle fiber in the same motor unit; jitter is characterized as instability in subcomponents of motor unit action potentials, and is due to the variation in the synaptic delay at the branch points in the distal axon and at the neuromuscular junction; like fiber density, jitter is ↑ in neuropathic conditions–motor neuron diseases–eg, myasthenia gravis, is accompanied by denervation and reinnervation, and attributed to inefficient transmission of impulses in recent neural collaterals, or due to blocking–abnormal neuromuscular transmission; it is normal or near-normal in myopathic disease. See Fiber density, Single-fiber electromyography PsychologyJitters, see there.
McGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
The MEMS Oscillator has a stability of up to [+ or -]10 ppm and 500 fs of integrated RMS phase jitter.
One can see that if the phase jitter is kept the same (in radians) for different frequencies, the time jitter will scale linearly proportional to approximately 1/[F.sub.o].
SATO Healthcare will also collaborate with SATO Vicinity, another recent addition to the SATO family, and a pioneer in RFID technology, well-recognized for its unique PJM (Phase Jitter Modulation) radio frequency data transmission technology.
Other features include: support for multiple output load conditions (differential LV-PECL, LVDS, HCSL), thickness of 1.2 mm, output frequency range of 100 MHz to 700 MHz, supply voltage of 2.5 [+ or -]0.125 V/3.3 [+ or -]0.33 V, frequency tolerance of [+ or -]50 x [10.sup.-6], and phase jitter of 0.2 ps Max.
The question then arises as to how to manipulate the division ratio of the divider in order to reduce the low frequency phase jitter that it produces on its output.
Available in a frequency range from 40MHz to 200MHz, and designed for 2.5V or 3.3V supply, these oscillators offer femtosecond integrated phase jitter performance (200fs typical) with an ultra-low phase noise of
The SiT9102 also offers random rms phase jitter of < 1ps.
Phase jitter performance is better than [less than] 6 ps rms for frequencies greater than 12 MHz.