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  2. Noise calculation - Wikipedia

    en.wikipedia.org/wiki/Noise_calculation

    The method or process of determining the resulting immission level is called noise calculation, its graphical representation is called noise map. Noise calculation is done for the following reasons: to calculate a current situation based on existing physics, mostly when a physical measurement at a location is impractical

  3. Signal-to-noise ratio - Wikipedia

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

    The concepts of signal-to-noise ratio and dynamic range are closely related. Dynamic range measures the ratio between the strongest un-distorted signal on a channel and the minimum discernible signal, which for most purposes is the noise level. SNR measures the ratio between an arbitrary signal level (not necessarily the most powerful signal ...

  4. Noise measurement - Wikipedia

    en.wikipedia.org/wiki/Noise_measurement

    When sound levels reach a high enough intensity, the sound, whether it is wanted or unwanted, may be damaging to hearing. [3] Environmental noise monitoring is the measurement of noise in an outdoor environment caused by transport (e.g. motor vehicles, aircraft, and trains), industry (e.g. machines) and recreational activities (e.g. music).

  5. Friis formulas for noise - Wikipedia

    en.wikipedia.org/wiki/Friis_formulas_for_noise

    Friis's formula is used to calculate the total noise factor of a cascade of stages, each with its own noise factor and power gain (assuming that the impedances are matched at each stage). The total noise factor can then be used to calculate the total noise figure. The total noise factor is given as

  6. Stokes's law of sound attenuation - Wikipedia

    en.wikipedia.org/wiki/Stokes's_law_of_sound...

    In acoustics, Stokes's law of sound attenuation is a formula for the attenuation of sound in a Newtonian fluid, such as water or air, due to the fluid's viscosity.It states that the amplitude of a plane wave decreases exponentially with distance traveled, at a rate α given by = where η is the dynamic viscosity coefficient of the fluid, ω is the sound's angular frequency, ρ is the fluid ...

  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.

  8. Noise map - Wikipedia

    en.wikipedia.org/wiki/Noise_map

    Using either approach, a grid of receivers must be defined in order to measure or calculate noise levels. When results are obtained, using GIS tools, spatial interpolation must be applied in order to give a continuous graphical representation of sound levels. According to the END five dBA ranges are used for this contour (isoline) representation.

  9. Signal-to-interference-plus-noise ratio - Wikipedia

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

    In information theory and telecommunication engineering, the signal-to-interference-plus-noise ratio (SINR [1]) (also known as the signal-to-noise-plus-interference ratio (SNIR) [2]) is a quantity used to give theoretical upper bounds on channel capacity (or the rate of information transfer) in wireless communication systems such as networks.

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