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  2. Sound pressure - Wikipedia

    en.wikipedia.org/wiki/Sound_pressure

    EPA-identified maximum to protect against hearing loss and other disruptive effects from noise, such as sleep disturbance, stress, learning detriment, etc. [29] Ambient 0.06 70 TV (set at home level) 1 m 0.02 60 Normal conversation 1 m 2×10 −3 –0.02 40–60 Passenger car (electric) [30] 10 m 0.02–0.20 38-48 Very calm room Ambient 2.00× ...

  3. Signal-to-noise ratio - Wikipedia

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

    If the noise has expected value of zero, as is common, the denominator is its variance, the square of its standard deviation σ N. The signal and the noise must be measured the same way, for example as voltages across the same impedance. Their root mean squares can alternatively be used according to:

  4. Noise figure - Wikipedia

    en.wikipedia.org/wiki/Noise_figure

    The noise power from a simple load is equal to kTB, where k is the Boltzmann constant, T is the absolute temperature of the load (for example a resistor), and B is the measurement bandwidth. This makes the noise figure a useful figure of merit for terrestrial systems, where the antenna effective temperature is usually near the standard 290 K ...

  5. Noise curve - Wikipedia

    en.wikipedia.org/wiki/Noise_curve

    Noise curves are a common way to characterise background noise in unoccupied buildings and spaces. [1] Their purpose is to produce a single-value representation of a complete sound spectrum. International standards organizations ( ISO , [ 2 ] ANSI [ 3 ] and ASA ) recognize the need to objectify judgements on the amount of ambient noise in ...

  6. Sound level meter - Wikipedia

    en.wikipedia.org/wiki/Sound_level_meter

    A noise dosimeter (American) or noise dosemeter (British) is a specialized sound level meter intended specifically to measure the noise exposure of a person integrated over a period of time; usually to comply with Health and Safety regulations such as the Occupational Safety and Health (OSHA) 29 CFR 1910.95 Occupational Noise Exposure Standard ...

  7. Signal-to-noise ratio (imaging) - Wikipedia

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

    SNR is sometimes quantified in decibels (dB) of signal power relative to noise power, though in the imaging field the concept of "power" is sometimes taken to be the power of a voltage signal proportional to optical power; so a 20 dB SNR may mean either 10:1 or 100:1 optical power, depending on which definition is in use.

  8. Eb/N0 - Wikipedia

    en.wikipedia.org/wiki/Eb/N0

    / can be seen as a normalized measure of the energy per symbol to noise power spectral density (/): = where is the energy per symbol in joules and ρ is the ...

  9. Balanced audio - Wikipedia

    en.wikipedia.org/wiki/Balanced_audio

    As long as the impedances are balanced, noise will couple equally into the two wires (and be rejected by a differential amplifier), regardless of the signal that is present on them. [ 1 ] [ 2 ] A simple method of driving a balanced line is to inject the signal into the "hot" wire through a known source impedance , and connect the "cold" wire to ...

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