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  2. 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]

  3. Sound intensity - Wikipedia

    en.wikipedia.org/wiki/Sound_intensity

    1 dB = ⁠ 1 / 20 ⁠ ln(10) is the decibel. The commonly used reference sound intensity in air is [5] = /. being approximately the lowest sound intensity hearable by an undamaged human ear under room conditions.

  4. dBm - Wikipedia

    en.wikipedia.org/wiki/DBm

    dBm or dB mW (decibel-milliwatts) is a unit of power level expressed using a logarithmic decibel (dB) scale respective to one milliwatt (mW). It is commonly used by radio, microwave and fiber-optical communication technicians & engineers to measure the power of system transmissions on a log scale , which can express both very large and very ...

  5. Audiogram - Wikipedia

    en.wikipedia.org/wiki/Audiogram

    Audiogram. An audiogram is a graph that shows the audible threshold for standardized frequencies as measured by an audiometer.The Y axis represents intensity measured in decibels (dB) and the X axis represents frequency measured in hertz (Hz). [1]

  6. Sound transmission class - Wikipedia

    en.wikipedia.org/wiki/Sound_transmission_class

    A 0.1% open area will reduce the transmission loss from 40 dB to 30 dB, which is typical of walls where caulking has not been applied effectively [26] Partitions that are inadequately sealed and contain back-to-back electrical boxes, untreated recessed lighting and unsealed pipes offer flanking paths for sound and significant leakage. [27]

  7. Public health experts are warning of a ‘quad-demic’ this ...

    www.aol.com/finance/public-health-experts...

    Public health experts are warning of a ‘quad-demic’ this winter. Here’s where flu, COVID, RSV, and norovirus are spreading

  8. 10 Old Tech Gadgets Worth a Pretty Penny Today

    www.aol.com/finance/10-old-tech-gadgets-worth...

    Hailing from Japan, these digital pets were all the craze in the ’90s. By enabling users to care for a virtual pet, the pocket-sized devices mimicked all the responsibilities of real pet ...

  9. Transmission loss - Wikipedia

    en.wikipedia.org/wiki/Transmission_loss

    Measurement of transmission loss can be in terms of decibels. Mathematically, transmission loss is measured in dB scale and in general it can be defined using the following formula: TL = 10 log 10 ⁡ | W i W t | {\displaystyle 10\log _{10}\left\vert {W_{i} \over W_{t}}\right\vert } dB