noise

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noise

 [noiz]
1. unwanted variations in a signal that result from imperfections in transmission; see also signal-to-noise ratio.
2. any disturbance in a visual signal being recorded in radiography; see also mottle.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

noise

(noyz),
1. Unwanted sound, particularly a complex sound that lacks a musical quality because its various frequencies that comprise it are not whole-or-partial number multiples (harmonics) of each other. Compare: harmony.
2. Unwanted additions to a signal not arising at its source; for example, the 60-cycle frequency wave in an electrocardiogram; largely eliminated from machines after 1980 (includes visual noise on imaging studies).
3. Extraneous uncontrolled variables influencing the distibution of measurements in a set of data.
Farlex Partner Medical Dictionary © Farlex 2012

noise

Electronics
Random variation in signals of the electromagnetic spectrum that carries no useful information from the source.

Imaging
A term defined in MRI as an undesirable background signal interference or other disturbance, which affects image quality.

Occupational medicine
OSHA requires that anyone with occupational exposure to greater than 89 decibels should wear ear protection.
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.

noise

Electronics Random variation in signals of the electromagnetic spectrum that carries no useful information from the source. See Cymatics, Music therapy, Sound therapy Technology Poisson noise Fluctuation in the number of information carriers–photons, electrons, which appears as 'snow' in a cathode ray tube, a function of the statistical variation of the rays received by the detector and number of electrons produced by the photomultiplier. See White noise. Cf Chaos, Pink noise.
McGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.

noise

(noyz)
1. Unwanted sound, particularly complex sound that lacks a musical quality because the various frequencies of which it is composed are not whole or partial number multiples (harmonics) of each other.
2. Unwanted additions to a signal not arising at its source; includes visual noise on imaging studies.
See: signal:noise ratio
3. Extraneous uncontrolled variables influencing the distibution of measurements in a set of data.
[M.E., fr. O.Fr., fr. L.L. nausea, seasickness]
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

Patient discussion about noise

Q. what causes the sound of cracking noises in the head all the time it was said i had acute sinusitis but honestly i think it is more . I don't know why i have cracking noises in my head . I am very concerned about this also my neck is always stiff feeling and aching all the time. . My eyes are very tired and i see blue spots and they hurt behind the eye very badly . I have headaches very often

A. wow...that really sounds serious...i have chronic sinusitis and i can tell you i had horrible headaches but nothing like you describe now. i would strongly consider going to a hospital and checking it out...
tell us what was the result!

Q. Tinnitus (Ringing and Other Ear Noise) Anybody have this problem? Urrrrrrrrrrr, I think I want to shoot myself,you know what I mean. It is worst than the chinese torture. Someone, please send me a good tip how to stop it. I have this for 4 yrs and it is driving me crazy. You cannot enjoy total complete silence. They say silence is golden but not when you have this ringgi in your ears. It gets worst when there is no noise. The only remedy I have is eating hot spicy curry, it helps for 2-3 wks and then it comes back again and then eating spicy food again. Listening to classical music helps to. Oh well.....just have to suck it up.

A. I've read that lipoflavinoids can help.

Q. what can cause a migrane other than light, noise, andno sleep? Well its been 4 days n 3 nights that I have it n it dont go away it was bad at first but then my right ear hurted as well as my right upper wisdomteeth It seems to be in only the right side and its been movin down towards my neck... Please if u have any info on wha the fuck is goin on with me let me know asap...

A. A migraine attack can be triggered also by caffeine consumption, alcohol consumption, certain medications, allergic reactions, physical or emotional stress, smoking, skipping meals, menstrual cycle fluctuations, menopause, and certain food containing-
1) tyramine- red wine, aged cheese, smoked fish, chicken liver, figs and some beans.
2) nitrates - like hot dogs, bacon and salami.

More discussions about noise
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References in periodicals archive ?
This shows us that the algorithm has good noise immunity, which is mainly because the impact of different degree noise added to the contour curve is effectively reduced by integrating DCV of contour curves after evolution by means of Gaussian function to get comparatively smoother curves.
The results of simulation of modified synchronous phase detector showed the possibility of an increase of noise immunity of receiving signals with phase shift keying and the ability of the modified detector to detect OQPSK and 8PSK signals even when signal strength is less than the capacity of obstacles.
Since EFT noise is both common in a commercial environment and occupies the same frequency spectrum as the network signals, EFT testing provides a good indication of overall noise immunity of cabling systems.
For noise immunity it's just not practical to couple the traces (actually place the traces) so close together that any aggressor signal couples equally onto both signals.
The new, 8-pin, low-profile Power SOIC package for high-current power relays, provides input to output Isolation of 5000 Vrms, while optically coupled circuitry provides exceptional noise immunity. Switching of the efficient MOSFET switches is controlled by the photovoltaic die using the OptoMOS architecture while activation of the output is controlled by an efficient input LED.
Impulse noise immunity comes from extended symbol duration, since the impulse noise is usually of very short duration compared to symbol duration in parallel transmission.
With excellent QEF (Quasi Error Free) performance, improved echo cancellation capability and good phase noise immunity, the STV0279E enables manufacturers to produce lower cost STB solutions, with more robust performance, by using a lower cost tuner and other circuits.
The MW100 can withstand temperature extremes and high vibration and provides high levels of noise immunity and channel-to-channel input isolation.
A single, digital, fiber optic link eliminates up to 18 discrete wires per axis and prevents phasing and electrical noise immunity issues often associated with discrete wiring.
They require minimum length of shaft, have low inertia, no physical contact between shaft and housing, wide bandwidth, high resolution and accuracy, and excellent noise immunity.
"The new CRD8204 switch platform features Cicada's quad port SimpliPHY Series transceivers, and further strengthens our leading position of offering the highest performing Gigabit copper PHYs in volume production, in terms of noise immunity, interoperability and tolerance to cable plant variations."
Regardless of line codes or framing, the copper data stream is converted to optical signals for greater noise immunity and longer transmission.