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  2. Day-night average sound level - Wikipedia

    en.wikipedia.org/wiki/Day-Night_Average_Sound_Level

    There is a similar metric called day-evening-night average sound level (Lden or DENL) commonly used in other countries, or community noise exposure level (CNEL) used in California legislation; that is, the DNL with the addition of an evening period from 19:00 to 22:00 when noise level measurements are boosted 5 dB (or 4.77 dB in the case of ...

  3. Decibel - Wikipedia

    en.wikipedia.org/wiki/Decibel

    The decibel (symbol: dB) is a relative unit of measurement equal to one tenth of a bel (B). It expresses the ratio of two values of a power or root-power quantity on a logarithmic scale. Two signals whose levels differ by one decibel have a power ratio of 10 1/10 (approximately 1.26) or root-power ratio of 10 1/20 (approximately 1.12). [1] [2]

  4. Day–evening–night noise level - Wikipedia

    en.wikipedia.org/wiki/Day–evening–night_noise...

    The day–evening–night noise level or L den is a 2002 European standard to express noise level over an entire day. It imposes a penalty on sound levels during evening and night [1] and it is primarily used for noise assessments of airports, busy main roads, main railway lines and in cities over 100,000 residents.

  5. dBZ (meteorology) - Wikipedia

    en.wikipedia.org/wiki/DBZ_(meteorology)

    The scale of dBZ values can be seen along the bottom of the image. Decibel relative to Z, or dBZ, is a logarithmic dimensionless technical unit used in radar. It is mostly used in weather radar, to compare the equivalent reflectivity factor (Z) of a remote object (in mm 6 per m 3) to the return of a droplet of rain with a diameter of 1 mm (1 mm 6 per m 3). [1]

  6. Have Charlotte airport noise concerns? How to be heard at ...

    www.aol.com/news/charlotte-airport-noise...

    To determine noise levels, sounds are measured day and night and then averaged. If an area hits that 65 decibel level or higher, mitigation measures need to be taken.

  7. Dynamic range - Wikipedia

    en.wikipedia.org/wiki/Dynamic_range

    Vinyl microgroove phonograph records typically yield 55-65 dB, though the first play of the higher-fidelity outer rings can achieve a dynamic range of 70 dB. [25] German magnetic tape in 1941 was reported to have had a dynamic range of 60 dB, [26] though modern-day restoration experts of such tapes note 45-50 dB as the observed dynamic range. [27]

  8. Residents near Lantana Airport get the bad news: Noise is ...

    www.aol.com/residents-near-lantana-airport-bad...

    The report mapped what it called "a 65-decibel contour" to show what areas were under the 65 decibels and which were over. It showed the area over 65 decibels was located almost entirely within ...

  9. Signal-to-noise ratio - Wikipedia

    en.wikipedia.org/wiki/Signal-to-noise_ratio

    Substituting the definitions of SNR, signal, and noise in decibels into the above equation results in an important formula for calculating the signal to noise ratio in decibels, when the signal and noise are also in decibels: =,,.