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.

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.

noise

random signals or disturbances that interfere with the normal flow of data through pathways of computers and other electronic devices.

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.

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.

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]

noise

1. a loud, harsh and objectionable sound.
2. interference in an ecological or electronic system, but insufficient to stop the system.
3. in statistics when extraneous, uncontrolled variables cause errors in the distribution of data.

noise pollution
noise in the environment that adversely affects, in our context, the animal inhabitants. No such ill effects have been demonstrated.

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
References in classic literature ?
The noiseless door again turned on its hinges, and the Count of Monte Cristo reappeared.
Sometimes it steals along with a tranquil and noiseless course; at other times, for miles and miles, it dashes on in a thousand rapids, wild and beautiful to the eye, and lulling the ear with the soft tumult of plashing waters.
He did so, as noiseless as a ghost, and then I rang for the steward, and facing him boldly, directed him to tidy up my stateroom while I was having my bath--"and be quick about it.
Their steps were noiseless on the thick carpet of fir-needles, and the outward stillness seemed to heighten their inward consciousness, as Arthur took the key out of his pocket and placed it in Adam's hand, for him to open the door.
In fact, in the king's and queen's grand assemblies, while their majesties were speaking, and while every one present seemed to be listening in the midst of the most profound silence, some of these noiseless conversations took place, in which adulation was not the prevailing feature.
Then, abruptly, she buried her face on the cushioned arm of the sofa beside her chair, and broke into noiseless sobs.
Rays from the sunrise drew forth the buds and stretched them into long stalks, lifted up sap in noiseless streams, opened petals, and sucked out scents in invisible jets and breathings.
Cautiously I approached the recumbent figure, on noiseless feet.
Except for the clanking of accouterments and the occasional squeal of an angry thoat or the low guttural of a zitidar, the passage of the cavalcade was almost noiseless, for neither thoat nor zitidar is a hoofed animal, and the broad tires of the chariots are of an elastic composition, which gives forth no sound.
We are getting used to tidy, noiseless waiters, who glide hither and thither, and hover about your back and your elbows like butterflies, quick to comprehend orders, quick to fill them; thankful for a gratuity without regard to the amount; and always polite--never otherwise than polite.
Her great padded feet fell soft and noiseless on the narrow trail.
From the dim woods on either bank, Night's ghostly army, the grey shadows, creep out with noiseless tread to chase away the lingering rear- guard of the light, and pass, with noiseless, unseen feet, above the waving river-grass, and through the sighing rushes; and Night, upon her sombre throne, folds her black wings above the darkening world, and, from her phantom palace, lit by the pale stars, reigns in stillness.