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2. 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]

3. Decibel - Wikipedia

   en.wikipedia.org/wiki/Decibel

   The decibel originates from methods used to quantify signal loss in telegraph and telephone circuits. Until the mid-1920s, the unit for loss was miles of standard cable (MSC). 1 MSC corresponded to the loss of power over one mile (approximately 1.6 km) of standard telephone cable at a frequency of 5000 radians per second (795.8 Hz), and matched closely the smallest attenuation detectable to a ...

4. Sound pressure - Wikipedia

   en.wikipedia.org/wiki/Sound_pressure

   While 1 atm (194 dB peak or 191 dB SPL) [11] [12] is the largest pressure variation an undistorted sound wave can have in Earth's atmosphere (i. e., if the thermodynamic properties of the air are disregarded; in reality, the sound waves become progressively non-linear starting over 150 dB), larger sound waves can be present in other atmospheres ...

5. Sound exposure - Wikipedia

   en.wikipedia.org/wiki/Sound_exposure

   Sound exposure level (SEL) is a logarithmic measure of the sound exposure of a sound relative to a reference value. Sound exposure level, denoted L E and measured in dB , is defined by [ 1 ]

6. Sound power - Wikipedia

   en.wikipedia.org/wiki/Sound_power

   Sound power or acoustic power is the rate at which sound energy is emitted, reflected, transmitted or received, per unit time. [1] It is defined [2] as "through a surface, the product of the sound pressure, and the component of the particle velocity, at a point on the surface in the direction normal to the surface, integrated over that surface."

7. Sound intensity - Wikipedia

   en.wikipedia.org/wiki/Sound_intensity

   I 0 is the reference sound intensity; 1 Np = 1 is the neper; 1 B = ⁠ 1 / 2 ⁠ ln(10) is the bel; 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.