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  2. Keyboard expression - Wikipedia

    en.wikipedia.org/wiki/Keyboard_expression

    Keyboard expression is the ability of a keyboard musical instrument to change tone or other qualities of the sound in response to velocity, pressure or other variations in how the performer depresses the keys of the musical keyboard. Expression types include: Velocity sensitivity—how fast the key is pressed

  3. Keyboard matrix circuit - Wikipedia

    en.wikipedia.org/wiki/Keyboard_matrix_circuit

    This is drawn schematically as a matrix of 8 columns and 8 rows of wires, with a switch at every intersection. The keyboard controller scans the columns. If a key has been pressed, the controller scans the rows, determines the row-column combination at which a key has been pressed, and generates the code corresponding to that key.

  4. Musical keyboard - Wikipedia

    en.wikipedia.org/wiki/Musical_keyboard

    Because these keys receive less wear, they are often made of black colored wood and called the black notes or black keys. Black keys form a pentatonic scale. The entire pattern repeats at the interval of an octave. The arrangement of longer keys for C major with intervening, shorter keys for the intermediate semitones date to the 15th century.

  5. Keyboard technology - Wikipedia

    en.wikipedia.org/wiki/Keyboard_technology

    When the key is pressed, the foil tightly clings to the surface of the PCB, forming a daisy chain of two capacitors between contact pads and itself separated with a thin soldermask, and thus "shorting" the contact pads with an easily detectable drop of capacitive reactance between them. Usually, this permits a pulse or pulse train to be sensed.

  6. Keypad - Wikipedia

    en.wikipedia.org/wiki/Keypad

    A 16-key keypad uses a 4 × 4 array of 4 I/O lines as outputs and 4 as inputs. A circuit is completed between an output and an input when a key is pressed. Each individual keypress creates a unique signal for the host. If required, and if the processor allows, two keys can be pressed at the same time without ambiguity.

  7. Sticky keys - Wikipedia

    en.wikipedia.org/wiki/Sticky_keys

    Sticky keys is an accessibility feature of some graphical user interfaces which assists users who have physical disabilities or helps users reduce repetitive strain injury. It serializes keystrokes; instead of being required to press multiple keys at a time, the user can press and release a modifier key , such as ⇧ Shift , Ctrl , Alt , or the ...

  8. Keyboard instrument - Wikipedia

    en.wikipedia.org/wiki/Keyboard_instrument

    The earliest known keyboard instrument was the Ancient Greek hydraulis, a type of pipe organ invented in the third century BC. [2] The keys were likely balanced and could be played with a light touch, as is clear from the reference in a Latin poem by Claudian (late 4th century), who says magna levi detrudens murmura tactu . . . intonet, that is "let him thunder forth as he presses out mighty ...

  9. Electronic keyboard - Wikipedia

    en.wikipedia.org/wiki/Electronic_keyboard

    Semi-weighted keys is a term applied to keyboards with spring action like a non-weighted keyboard but that have extra weight added to the keys to give them more resistance and responsive feel. Hammer action keys use some kind of mechanism to replicate the action of a mechanical piano. This is often achieved with some kind of lever mechanism ...