noise reduction rating

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noise reduction rating [′nȯiz ri‚dək·shən ‚rād·iŋ]

(acoustics)

A common method for expressing values of noise reduction or attenuation provided by different types of hearing protectors; values range from 0 to approximately 30, with higher values indicating greater amounts of noise reduction. Abbreviated NRR.

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No references found			With a noise reduction rating of 30 dB, these earplugs can be used not only in environments where noise is just a nuisance, but also even in environments with hazardous noise levels. Earplugs for women by Ear, Nose and Throat Journal When you use ear muffs or ear plugs, note the Noise Reduction Rating (NRR). High Pressure Sound Level by Poh Tiong Ho / Health, general community 95) and earplugs with a noise reduction rating of 35dB (pounds 2. Bed partners are suffering as well by Coventry Evening Telegraph (England)			noise criterion curves noise digit noise distortion noise equivalent temperature difference noise factor Noise Figure noise filter noise generator noise grade noise immission level Noise Immunity noise improvement factor noise insulation noise isolation class noise jammer noise killer noise level noise limiter noise margin noise measurement noise pollution noise radial noise rating number noise reduction noise reduction coefficient noise reduction rating noise shaping noise silencer noise source noise suicide circuit noise suppression noise suppressor Noise Temperature noise testing noise tube noise weighting Noise, Atmospheric Noise, Receiver Noise, Terrestrial noise-canceling microphone noise-metallic noise-modulated jamming noise-power measurement noise-reducing antenna system noise-type flowmeter noiseless channel noisy channel noisy data noisy digit noisy mode noisy text			Noise Pick-Up noise pollution noise pollution noise pollution noise pollution noise pollution Noise Pollution and Abatement Act of 1970 Noise Pollution Clearinghouse Noise power Noise Power Level Reduction Noise Power Ratio Noise Power Spectral Density Noise Power Spectrum Noise Predictive Belief Propagation Noise Predictive Viterbi Noise Preferential Routes noise protection Noise Quality Measure noise radial noise rating number Noise reduction Noise reduction Noise reduction Noise reduction Noise reduction Noise Reduction Circuit Noise Reduction Coefficient Noise Reduction Coefficient Noise Reduction Coefficient Noise Reduction Headphones noise reduction rating Noise rejection Noise Research Advisory Committee Noise Sensitive Area Noise Shaped Video Noise shaping noise silencer noise source Noise Spectral Estimator noise suicide circuit Noise suppression Noise Suppression Circuit Noise Suppression Technologies, Inc. noise suppressor Noise temperature noise testing Noise to Signal Ratio Noise Tolerance Threshhold Noise Tolerant Mining in Databases Noise trader Noise Trader Risk Noise Trader Risks Noise Traders Noise Transfer Function noise tube

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