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  2. Electrical network frequency analysis - Wikipedia

    en.wikipedia.org/wiki/Electrical_network...

    Based on this result, researchers demonstrated that visual track from still video taken in indoor lighting environments also contain ENF traces that can be extracted by estimating the frequency at which ENF will appear in a video as low sampling frequency of video (25–30 Hz) cause significant aliasing. [7]

  3. The Hum - Wikipedia

    en.wikipedia.org/wiki/The_Hum

    The first was a 36 Hz tone from a cooling tower at the local DaimlerChrysler casting plant and the second was a 10 Hz tone from an air compressor intake at the Haynes International plant. [21] After those devices were corrected, however, reports of the hum persisted. [22] Three hums have been linked to mechanical sources.

  4. Zellweger off-peak - Wikipedia

    en.wikipedia.org/wiki/Zellweger_off-peak

    Example capture: The bright line at 50 Hz is the power frequency, followed by odd harmonics at 150 Hz, 250 Hz and so on. The ripple being turned on and off is clearly visible at 1050 Hz. Originally time-clocks were used; however, they can easily lose accurate time and are not easily adjusted for daylight saving time. Before the amalgamation of ...

  5. Mains hum - Wikipedia

    en.wikipedia.org/wiki/Mains_hum

    Mains hum, electric hum, cycle hum, or power line hum is a sound associated with alternating current which is twice the frequency of the mains electricity.The fundamental frequency of this sound is usually double that of fundamental 50/60 Hz, i.e., 100/120 Hz, depending on the local power-line frequency.

  6. Crystal oscillator frequencies - Wikipedia

    en.wikipedia.org/wiki/Crystal_oscillator_frequencies

    10.000 10 7 allows decade division to 1 Hz and 1 kHz. Common standard frequency. Commonly available as TCXO, the most common OCXO and GPS-disciplined oscillator available. Common stratum 3 Network Time Protocol frequency. [13] Common general microcontroller frequency. Common as cheap ceramic resonators where frequency stability is less concern ...

  7. Noise (electronics) - Wikipedia

    en.wikipedia.org/wiki/Noise_(electronics)

    Different types of noise are generated by different devices and different processes. Thermal noise is unavoidable at non-zero temperature (see fluctuation-dissipation theorem), while other types depend mostly on device type (such as shot noise, [1] [3] which needs a steep potential barrier) or manufacturing quality and semiconductor defects, such as conductance fluctuations, including 1/f noise.

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