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  2. NIOSH Power Tools Database - Wikipedia

    en.wikipedia.org/wiki/NIOSH_Power_Tools_Database

    The NIOSH Power Tools Database contains sound power levels, sound pressure levels, and vibrations data for a variety of common power tools that have been tested by researchers. Data are collected for both the unloaded and loaded use of power tools. The database was created by the National Institute for Occupational Safety and Health (NIOSH).

  3. Noise temperature - Wikipedia

    en.wikipedia.org/wiki/Noise_temperature

    The noise factor (a linear term) is more often expressed as the noise figure (in decibels) using the conversion: = ⁡ The noise figure can also be seen as the decrease in signal-to-noise ratio (SNR) caused by passing a signal through a system if the original signal had a noise temperature of 290 K. This is a common way of expressing the noise ...

  4. Sound power - Wikipedia

    en.wikipedia.org/wiki/Sound_power

    TL. v. t. e. 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 ...

  5. Quota Count system - Wikipedia

    en.wikipedia.org/wiki/Quota_Count_system

    The quota count doubles with each increase of 3 dB which corresponds to an approximate doubling of noise power. However, due to the logarithmic nature of human aural perception, this 3 dB change is perceived as only a small change in the noise level. Airports operating the system have a fixed quota for each of the summer and winter seasons.

  6. Sound reduction index - Wikipedia

    en.wikipedia.org/wiki/Sound_Reduction_Index

    Sound reduction index. The sound reduction index is used to measure the level of sound insulation provided by a structure such as a wall, window, door, or ventilator. It is defined in the series of international standards ISO 16283 (parts 1-3) and the older ISO 140 (parts 1-14), or the regional or national variants on these standards.

  7. Noise figure - Wikipedia

    en.wikipedia.org/wiki/Noise_figure

    The noise figure is the difference in decibel (dB) between the noise output of the actual receiver to the noise output of an "ideal" receiver with the same overall gain and bandwidth when the receivers are connected to matched sources at the standard noise temperature T0 (usually 290 K).

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