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  2. 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.

  3. Piano acoustics - Wikipedia

    en.wikipedia.org/wiki/Piano_acoustics

    The Railsback curve shows how a piano tuned to compensate for inharmonicity deviates from theoretically correct equal-tempered tuning. The Railsback curve, first measured in the 1930s by O.L. Railsback, a US college physics teacher, expresses the difference between inharmonicity-aware stretched piano tuning, and theoretically correct equal-tempered tuning in which the frequencies of successive ...

  4. Extremely high frequency - Wikipedia

    en.wikipedia.org/wiki/Extremely_high_frequency

    This type of treatment may be called millimeter wave therapy or extremely high frequency therapy. [27] This treatment is associated with eastern European nations (e.g., former USSR nations). [25] The Russian Journal Millimeter waves in biology and medicine studies the scientific basis and clinical applications of millimeter wave therapy. [28]

  5. FreeWave Technologies - Wikipedia

    en.wikipedia.org/wiki/FreeWave_Technologies

    Free Wave Technologies, Inc. designs and manufactures secure machine-to-machine wireless networking, communications, and computing systems. Their radios can capture and transmit data from devices such as sensors, gauges, valves, robots, drones, and unmanned vehicles over long distances (60+ miles / 96+ kilometers) in clear line-of-sight environments and harsh environments.

  6. Amplitude-shift keying - Wikipedia

    en.wikipedia.org/wiki/Amplitude-shift_keying

    Amplitude-shift keying (ASK) is a form of amplitude modulation that represents digital data as variations in the amplitude of a carrier wave. [1] In an ASK system, a symbol, representing one or more bits, is sent by transmitting a fixed-amplitude carrier wave at a fixed frequency for a specific time duration.

  7. Frequency-shift keying - Wikipedia

    en.wikipedia.org/wiki/Frequency-shift_keying

    Some early Continuous Wave (CW) transmitters employed an arc converter that could not be conveniently keyed. Instead of turning the arc on and off, the key slightly changed the transmitter frequency in a technique known as the compensation-wave method. [13] The compensation-wave was not used at the receiver.

  8. Your February Love Horoscope Is Full of Unexpected Romances ...

    www.aol.com/february-love-horoscope-full...

    This brings a wave of clarity to your personal life, specifically regarding your one-on-one partnerships — release what no longer fulfills you. Pisces (Feb. 18-March 20)

  9. Remote keyless system - Wikipedia

    en.wikipedia.org/wiki/Remote_keyless_system

    The functions of a remote keyless entry system are contained on a key fob or built into the ignition key handle itself. Buttons are dedicated to locking or unlocking the doors and opening the trunk or tailgate. On some minivans, the power sliding doors can be opened/closed remotely.

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