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  2. Headphones - Wikipedia

    en.wikipedia.org/wiki/Headphones

    Some headphones are wireless, using Bluetooth connectivity to receive the audio signal by radio waves from source devices like cellphones and digital players. [5] As a result of the Walkman effect, beginning in the 1980s, headphones started to be used in public places such as sidewalks, grocery stores, and public transit. [6]

  3. Radio noise - Wikipedia

    en.wikipedia.org/wiki/Radio_noise

    Radio noise near in frequency to a received radio signal (in the receiver's passband) interferes (RFI) with the operation of the receiver's circuitry.The level of noise determines the maximum sensitivity and reception range of a radio receiver; if no noise were picked up with radio signals, even weak transmissions could be received at virtually any distance by making a radio receiver that had ...

  4. Smartphone - Wikipedia

    en.wikipedia.org/wiki/Smartphone

    A wide range of accessories are sold for smartphones, including cases, memory cards, screen protectors, chargers, wireless power stations, USB On-The-Go adapters (for connecting USB drives and or, in some cases, a HDMI cable to an external monitor), MHL adapters, add-on batteries, power banks, headphones, combined headphone-microphones (which ...

  5. Photon noise - Wikipedia

    en.wikipedia.org/wiki/Photon_noise

    Photon noise is the randomness [citation needed] in signal associated with photons arriving at a detector. For a simple black body emitting on an absorber, the noise-equivalent power is given by N E P 2 = 2 h 2 ν 2 Δ ν ( n η + n 2 ) {\displaystyle \mathrm {NEP} ^{2}=2h^{2}\nu ^{2}\Delta \nu \left({\frac {n}{\eta }}+n^{2}\right)}