Electrical or chemical interferences with the signal coming from the detector of an analytical instrument. The analyte must create a signal in the detector which sufficiently overcomes these interferences in order to be detected. In the case of dioxin/furan analysis, the signal to noise ratio must be greater than 2.5 for all monitored analyte signals.
In an amplifier or other device that draws current, there is always some noise output in addition to the desired signal
The noise level in a space, which is a composite of sound from HVAC, equipment, activity noises, etc., from both near and far, but excluding specific sources of interest such as a person talking in an adjacent space (which would be considered the signal).
You'll most often see this term when reading about noise-canceling microphones that filter out background noise. It refers to the everyday sounds that are all around you…people talking, papers shuffling, computer equipment buzzing, and so on. If your Mic transmitted all those sounds along with your voice it would probably be hard for the person on the other end to hear what you were saying.
In astronomy, a term applied to all sources of unwanted fluctuations in the output of a system that is producing, measuring or recording a signal. Natural background noise sources in radio astronomy include galactic noise (synchrotron radiation), thermal noise from receivers and the Earth's atmosphere, quantum noise, and the cosmic microwave background. Some of these are, of course, in the foreground of most astronomical objects
The extraneous signals caused by random signal sources within or exterior to the ultrasonic testing system, including the test material. Sometimes called grass or hash.
Extraneous noise contaminating sound measurements that cannot be separated from the desired signal
Extraneous signals that might be confused with the required measurement.
Humans send out signals into space every day, via television transmissions and radio broadcasts. Military radar is the strongest type of background noise, and the earliest military radar signals are approximated to be fifty light years away from earth.
The noise naturally present in an infrared detector, independent of the signal strength or ambient temperature. This is usually masked by software, but it may occasionally appear as image graininess in very bland scenes.
Background noise is the total noise from all sources other than the sound of interest.
In listening, it is any sound (normally unwanted) that is not part of the sound track being auditioned. In measurement, it is extraneous sound that, if too loud, can cause errors in the measured data.
Background noise is the noise present in an environment, other than the desired or foreground sound. Also referred to as Ambient Noise, it is the combination of all sounds generated both near and far.
Noise in a work environment at a level low enough not to interfere with the normal conduct of business and conversation.
The total noise floor from all sources of interference in a measurement system, independent of the presence of a data signal.
The sum total of all noise generated from all direct and reflected sound sources in a space that can represent an interface to good listening and speech intelligibility. (Hearing impaired persons are especially victimized by background noise).
as defined in BS4142, it is the A-weighted sound pressure level that is exceeded for 90% of a given time (LA90)
The sound level present in a room or space at any given time above which speech, music, desired signal, or sound must be raised in order to be heard or made intelligible.
The noise present in a sensor (detector) independent of the signal strength or ambient temperature. Normally caused by thermal, generant-recombinant characteristics or 1/f effects.
the sounds present at a relatively constant low level at a specific location
In communications, any unwanted signal that enters a line, channel, or circuit. ... more
The total system noise in the absence of information transmission.
In acoustics and specifically in acoustical engineering, background noise is any sound other than the sound being monitored. Background noise is a form of noise pollution or interference. Background noise is an important concept in setting noise regulations.