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 ?
Sidi, "Jitter buffer analysis," in Proceeding of the 17th International Conference on Computer Communications and Networks (ICCCN 08, pp.
The jitter buffer holds incoming packets, rearranges the arriving packets due to the time when the arriving packets are generated at the sending host, and releases them for decoding at a regulated speed (i.e., every 10 ms).
Sizing the CESoP inter-working function (IWF) jitter buffer to a value that is well fitted for the packet delay variation (PDV) on the packet network is also important.
VoIP requires packet processing beyond the network interface, where the jitter buffer resides.
To preserve natural interactivity, end-to-end transport latencies of less than 100 ms are required, considering all the other latencies already introduced by the codecs, jitter buffer, etc.
This is what we can assume to be the minimum time to access each local loop, and will therefore be the minimum jitter buffer needed.
In addition, WebRTC includes one of the best error/loss concealment engines (this was the original GIPS core technology), so it is relatively easy to eliminate the jitter buffers in both directions in the media servers.
* VoIP gateways with support for multiple telephone interfaces and a minimum of two ports (voice media gateways that support capabilities such as adaptive echo cancellation, forward error correction, bad frame interpolation and dynamic jitter buffers so that voice quality is enhanced).
To counter these negative effects, equipment vendors are designing telephone network interfaces that provide superior echo cancellation, noise filters, jitter buffers and caching to improve voice quality and deliver excellent speech recognition.
The BV7100 and BV7060 incorporate advanced jitter buffers, silence suppression, echo cancellation, VLAN tagging, DiffServ, ToS and NAT Traversal features.
Jitter is largely compensated for by adaptive jitter buffers, which, in general, turn the jitter problem into a delay and packet-loss problem, where excessively delayed packets are dropped (i.e., lost).
This variation in latency will lead to VoIP packet jitter, severely degrading voice quality, and requiring large playback buffers on VoIP equipment (termed jitter buffers).