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  2. Sound reduction index - Wikipedia

    en.wikipedia.org/wiki/Sound_Reduction_Index

    The Sound Reduction Index is expressed in decibels (dB). It is the weighted sound reduction index for a partition or single component only. This is a laboratory-only measurement, which uses knowledge of the relative sizes of the rooms in the test suite, and the reverberation time in the receiving room, and the known level of noise which can pass between the rooms in the suite by other routes ...

  3. Sound pressure - Wikipedia

    en.wikipedia.org/wiki/Sound_pressure

    B-weighted sound pressure level is written either as dB B or L B, and C-weighted sound pressure level is written either as dB C or L C. Unweighted sound pressure level is called "linear sound pressure level" and is often written as dB L or just L. Some sound measuring instruments use the letter "Z" as an indication of linear SPL. [13]

  4. Noise level - Wikipedia

    en.wikipedia.org/wiki/Noise_level

    Download as PDF; Printable version; In other projects ... The noise level is the level of noise. Specifically, it may refer to: Noise (electronics) Ambient noise ...

  5. A-weighting - Wikipedia

    en.wikipedia.org/wiki/A-weighting

    A graph of the A-, B-, C- and D-weightings across the frequency range 10 Hz – 20 kHz Video illustrating A-weighting by analyzing a sine sweep (contains audio). A-weighting is a form of frequency weighting and the most commonly used of a family of curves defined in the International standard IEC 61672:2003 and various national standards relating to the measurement of sound pressure level. [1]

  6. Maxine is usually so happy and smiley, so it's clear that the outfit dad put on her is what's making her so upset. I cracked up when he asked if she liked it, and she looked at him like he was ...

  7. Pamela Anderson 'Didn't Realize How Difficult' It Was for Her ...

    www.aol.com/pamela-anderson-didnt-realize...

    Pamela Anderson is reflecting on the "difficult" combination of her image as a Hollywood star and, simultaneously, a mother, earlier in her career. But when it comes to her sons Brandon, now 28 ...

  8. Ambient noise level - Wikipedia

    en.wikipedia.org/wiki/Ambient_noise_level

    Ambient noise level is measured with a sound level meter. [4] It is usually measured in dB relative to a reference pressure of 0.00002 Pa, i.e., 20 μPa (micropascals) in SI units. [5] This is because 20 μPa is the faintest sound the human ear can detect. [5] A pascal is a newton per square meter. The centimeter-gram-second system of units ...

  9. Here's the Christmas town where Santa’s elves answer ... - AOL

    www.aol.com/news/heres-christmas-town-where...

    Santa Claus, Indiana, is home to a beloved tradition in which volunteers, or "elves," respond to thousands of Christmas letters sent to Santa each year from children from all over.