Background noise
It is an important consideration with the use of ultrasound (e.g. for medical diagnosis or imaging), sonar, and sound reproduction.In astronomy, background noise or cosmic background radiation is electromagnetic radiation from the sky with no discernible source.In physics and telecommunication, background signal noise can be detrimental or in some cases beneficial.The study of avoiding, reducing or using signal noise is information theory.In telephony, artificial comfort noise is used as a substitute for natural background noise, to fill in artificial silence created by discontinuous transmission systems using voice activity detection.
Ambient musicNoise musicnoise criteriaSpectrogramnoise pollutioninterferenceenvironmental noiseswater wavestraffic noisealarmsspeechbioacoustic noiserefrigeratorsair conditioningpower suppliesmotorsactive noise controlultrasoundmedical diagnosissound reproductionastronomycosmic background radiationelectromagnetic radiationinformation architecturephysicstelecommunicationsignal noiseinformation theorytelephonycomfort noisediscontinuous transmissionvoice activity detectionAmbient noise levelElectronic noiseThe HumColors of noiseSound maskingAcoustic quietingDistortionNoise cancellationNoise controlNoise measurementNoise powerNoise reductionNoise temperaturePhase distortionBuildingsElectronicsEnvironmentGovernment regulationHuman healthImagesTransportationAdditive white Gaussian noiseAtmospheric noiseBrownian noiseBurst noiseCosmic noiseFlicker noiseGaussian noiseGrey noiseInfrasoundJitterJohnson–Nyquist noisePink noiseQuantization errorShot noiseWhite noiseValue noiseGradient noiseWorley noiseChannel noise levelCircuit noise levelEffective input noise temperatureEquivalent noise resistanceEquivalent pulse code modulation noiseImpulse noise (audio)Noise figureNoise floorNoise shapingNoise spectral densityNoise, vibration, and harshnessPhase noisePseudorandom noiseStatistical noiseCarrier-to-noise ratioCarrier-to-receiver noise densityModulation error ratioSignal, noise and distortionSignal-to-interference ratioSignal-to-noise ratioSignal-to-noise ratio (imaging)Signal-to-interference-plus-noise ratioSignal-to-quantization-noise ratioContrast-to-noise ratioList of noise topicsAcousticsInterference (communication)Noise generatorSpectrum analyzerThermal radiationLow-pass filterMedian filterTotal variation denoisingGaussian blurAnisotropic diffusionBilateral filterNon-local meansBlock-matching and 3D filteringShrinkage FieldsDeep Image Prior