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

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]

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 ?
Some of the walls were four feet thick, and there used to be queer noises inside them, as if there might be a little secret staircase.
While the hangman addressed them to this effect, in the tone and with the air of a pastor in familiar conversation with his flock, the noise had been in some degree subdued; for the rioters were busy in conveying the prisoners to the Sessions House, which was beyond the main walls of the prison, though connected with it, and the crowd were busy too, in passing them from thence along the street.
When this last task had been achieved, the shouts and cries grew fainter; the clank of fetters, which had resounded on all sides as the prisoners escaped, was heard no more; all the noises of the crowd subsided into a hoarse and sullen murmur as it passed into the distance; and when the human tide had rolled away, a melancholy heap of smoking ruins marked the spot where it had lately chafed and roared.
If, on the contrary, it is a prisoner, the noise I make will alarm him, he will cease, and not begin again until he thinks every one is asleep."
It was easy to call his jailer's attention to the noise, and watch his countenance as he listened; but might he not by this means destroy hopes far more important than the short-lived satisfaction of his own curiosity?
I could not help feeling that if he obtained some evidence for his senses by any sort of noise, voice, or movement, his madness would gain strength enough to burst the lock.
I suppose he had got up on the bench, and fumbling about amongst them must have brought one down, which, falling, had produced that rattling noise. But in any case to go to meet him would have been folly, because, after all, I might have been overpowered (even with bare hands) and then Dona Rita would have been left utterly defenceless.
It opened with difficulty, and then only on darkness; but as I turned back, the door behind me sank back and settled into its place with a noise as of innumerable bolts.
He was just about to resume his trudge in the twilight, telling himself it was no affair of his, but instinctively twisting and untwisting twenty theories about what the odd noises might mean.
"Those noises at night make the hair on my head bristle.
It was a relief to perceive at last from whence came some of these noises which had been roared into his ears.
He uttered little crooning noises, alternating with sharp cries akin to pain, half-ecstatic, half-petulant, as he drew a black clay pipe from a hole in his ear-lobe, and into the bowl of it, with trembling fingers, untwisted and crumbled the cheap leaf of spoiled Virginia crop.