noise

(redirected from Noise floor)
Also found in: Dictionary, Thesaurus, Legal, Financial, Encyclopedia, Wikipedia.

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 periodicals archive ?
the extent that it operates under the noise floor and creates no
In five of these seven ears, DPOAE amplitudes were significantly above the noise floor at 500 Hz, 750 Hz, and 1 kHz and below the noise floor at the higher frequencies.
Another worry suggests that the cumulative effect of wide scale proliferation of UWB devices would have a cumulative effect on the noise floor and raise it to an unacceptable level.
In order to establish whether DPOAEs were detectable in each perforation condition, we adopted a criterion threshold of 3 dB above the noise floor.
The noise floor in a 30-Hz to 15-kHz noise bandwidth should be at least 60 dB below 0 Vu with all equipment in the signal chain adjusted for normal operation.
With a noise floor of -170 dBc/Hz at 10 MHz, the SLC has the lowest phase noise of any synthesizer in a compact, low cost package.
The patented mounting design of the ILM system incorporates a rigid structure that provides the low noise floor needed to obtain nanometer resolution.
Each pulse, when applied through a Fourier Transform formula, can be shown to exist simultaneously across an extensive band of frequencies; however, the distributed energy of the pulse at any given frequency exists in the noise floor.
Test data is analyzed to determine loop length, cable balance, and noise floor (metallic noise).
Until now, available bit error rate testers have been unable to generate the requisite degree of impairments with a low enough jitter noise floor to perform these tasks effectively.
The OX-205 Ultra Low Noise OCXO achieves a -178dBc/Hz phase noise floor in 25.
Incorporating new ultra-low noise amplifiers with a 900nV input referred noise floor, the devices are the first ANC speaker drivers to produce no audible high-frequency hiss when paired with low-noise microphones.