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2. Crystal oscillator frequencies - Wikipedia

   en.wikipedia.org/wiki/Crystal_oscillator_frequencies

   Crystal oscillators can be manufactured for oscillation over a wide range of frequencies, from a few kilohertz up to several hundred megahertz.Many applications call for a crystal oscillator frequency conveniently related to some other desired frequency, so hundreds of standard crystal frequencies are made in large quantities and stocked by electronics distributors.

3. Utility frequency - Wikipedia

   en.wikipedia.org/wiki/Utility_frequency

   The waveform of 230 V and 50 Hz compared with 120 V and 60 Hz. The utility frequency, (power) line frequency (American English) or mains frequency (British English) is the nominal frequency of the oscillations of alternating current (AC) in a wide area synchronous grid transmitted from a power station to the end-user.

4. Sampling (signal processing) - Wikipedia

   en.wikipedia.org/wiki/Sampling_(signal_processing)

   The image sampling frequency is the repetition rate of the sensor integration period. Since the integration period may be significantly shorter than the time between repetitions, the sampling frequency can be different from the inverse of the sample time: 50 Hz – PAL video; 60 / 1.001 Hz ~= 59.94 Hz – NTSC video

5. Frequency changer - Wikipedia

   en.wikipedia.org/wiki/Frequency_changer

   Often airplanes use 400 Hz power so a 50 Hz or 60 Hz to 400 Hz frequency converter is needed for use in the ground power unit used to power the airplane while it is on the ground. Airlines might also utilize the converters to provide in-air wall current to passengers for use with laptops and the like.

6. Nyquist rate - Wikipedia

   en.wikipedia.org/wiki/Nyquist_rate

   In signal processing, the Nyquist rate, named after Harry Nyquist, is a value equal to twice the highest frequency (bandwidth) of a given function or signal. It has units of samples per unit time, conventionally expressed as samples per second, or hertz (Hz). [1] When the signal is sampled at a higher sample rate (see § Critical frequency ...

7. Mains electricity by country - Wikipedia

   en.wikipedia.org/wiki/Mains_electricity_by_country

   50 Hz Guam: A, B 110 V 190 V 60 Hz Guatemala: A, B 120 V 208 V 60 Hz Guernsey: G 230 V 400 V 50 Hz Guinea: C, F, K 220 V 380 V 50 Hz Guinea-Bissau: C, E, F 220 V 380 V 50 Hz Guyana: A, B, D, G 110 V 220 V [32] 190 V 60 Hz 50 Hz [32] Conversion of 50 Hz distribution to 60 Hz is ongoing. [33] Haiti: A, B 110 V 220/380 V 110/220 V

8. Sample-rate conversion - Wikipedia

   en.wikipedia.org/wiki/Sample-rate_conversion

   Sample-rate conversion, sampling-frequency conversion or resampling is the process of changing the sampling rate or sampling frequency of a discrete signal to obtain a new discrete representation of the underlying continuous signal. [1] Application areas include image scaling [2] and audio/visual systems, where different sampling rates may be ...

9. Band-stop filter - Wikipedia

   en.wikipedia.org/wiki/Band-stop_filter

   middle frequency: 60 Hz, high frequency: 61 Hz. This means that the filter passes all frequencies, except for the range of 59–61 Hz. This would be used to filter out the mains hum from the 60 Hz power line, though its higher harmonics could still be present. For countries where power transmission is at 50 Hz, the filter would have a 49–51 ...