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  2. Orders of magnitude (frequency) - Wikipedia

    en.wikipedia.org/wiki/Orders_of_magnitude...

    1 hertz (Hz) 1 to 1.66 Hz: Approximate frequency of an adult human's resting heart beat: 1 Hz: 60 bpm, common tempo in music 2 Hz: 120 bpm, common tempo in music ~7.83 Hz: Fundamental frequency of the Schumann resonances: 10 1: 10 hertz 10 Hz: Cyclic rate of a typical automobile engine at idle (equivalent to 600 rpm) 12 Hz

  3. Piano key frequencies - Wikipedia

    en.wikipedia.org/wiki/Piano_key_frequencies

    This is a list of the fundamental frequencies in hertz (cycles per second) of the keys of a modern 88-key standard or 108-key extended piano in twelve-tone equal temperament, with the 49th key, the fifth A (called A 4), tuned to 440 Hz (referred to as A440). [1] [2] Every octave is made of twelve steps called semitones.

  4. Refresh rate - Wikipedia

    en.wikipedia.org/wiki/Refresh_rate

    However, the lower refresh rate of 50 Hz introduces more flicker, so sets that use digital technology to double the refresh rate to 100 Hz are now very popular. (see Broadcast television systems ) Another difference between 50 Hz and 60 Hz standards is the way motion pictures (film sources as opposed to video camera sources) are transferred or ...

  5. Pythagorean tuning - Wikipedia

    en.wikipedia.org/wiki/Pythagorean_tuning

    The purpose of this adjustment is to move the 12 notes within a smaller range of frequency, namely within the interval between the base note D and the D above it (a note with twice its frequency). This interval is typically called the basic octave (on a piano keyboard, an octave has only 12 keys).

  6. Keyboard technology - Wikipedia

    en.wikipedia.org/wiki/Keyboard_technology

    The technology of computer keyboards includes many elements. Many different keyboard technologies have been developed for consumer demands and optimized for industrial applications. The standard full-size (100%) computer alphanumeric keyboard typically uses 101 to 105 keys; keyboards integrated in laptop computers are typically less comprehensive.

  7. Piano tuning - Wikipedia

    en.wikipedia.org/wiki/Piano_tuning

    In all systems of tuning, every pitch may be derived from its relationship to a chosen fixed pitch, which is usually A440 (440 Hz), the note A above middle C. For a classical piano and musical theory, the middle C is usually labelled as C 4 (as in scientific pitch notation ); However, in the MIDI standard definition this middle C (261.626 Hz ...

  8. Microsoft is adding an AI button to PC keyboards, their first ...

    www.aol.com/finance/microsoft-adding-ai-button...

    The first update to the Windows PC keyboard in almost 30 years, the Copilot key will be available on laptops and desktop keyboards from Microsoft’s OEM partners beginning in February.

  9. Frame rate - Wikipedia

    en.wikipedia.org/wiki/Frame_rate

    Computer monitors marketed to competitive PC gamers can hit 360 Hz, 500 Hz, or more. [21] High frame rates make action scenes look less blurry, such as sprinting through the wilderness in an open world game, spinning rapidly to face an opponent in a first-person shooter , or keeping track of details during an intense fight in a multiplayer ...

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