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2. Noise pollution - Wikipedia

   en.wikipedia.org/wiki/Noise_pollution

   Noise pollution, or sound pollution, is the propagation of noise or sound with ranging impacts on the activity of human or animal life, most of which are harmful to a degree. The source of outdoor noise worldwide is mainly caused by machines, transport and propagation systems.

3. Health effects from noise - Wikipedia

   en.wikipedia.org/wiki/Health_effects_from_noise

   Noise health effects are the physical and psychological health consequences of regular exposure to consistent elevated sound levels. Noise from traffic, in particular, is considered by the World Health Organization to be one of the worst environmental stressors for humans, second only to air pollution. [2]

4. Throat microphone - Wikipedia

   en.wikipedia.org/wiki/Throat_microphone

   Charles Edmond Prince led the development of throat microphones for the British during World War I for use in the noisy and windy environment of aircraft cockpits. Over a 3 year period from 1915-1918 they went through a series of prototype and production handheld "airplane telephones" before arriving at a hands free throat mic incorporated into a leather flying helmet.

5. 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.

6. 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:

7. Johnson–Nyquist noise - Wikipedia

   en.wikipedia.org/wiki/Johnson–Nyquist_noise

   Johnson–Nyquist noise (thermal noise, Johnson noise, or Nyquist noise) is the electronic noise generated by the thermal agitation of the charge carriers (usually the electrons) inside an electrical conductor at equilibrium, which happens regardless of any applied voltage.