China
Africa
Explore chapters and articles related to this topic
MIDI: connecting instruments together
Published in Kirk Ross, Hunt Andy, Digital Sound Processing for Music and Multimedia, 2013
When polyphonic synthesisers became available in the late 1970s this method of linking keyboards would no longer work. A polyphonic keyboard allows several notes to be played at once and therefore cannot have a single control voltage to denote ‘which single key is pressed’. Instead there is a microprocessor inside the keyboard that scans the keys, and produces an electronic key-code representing each key that is currently pressed. Manufacturers used this facility to produce the first sequencers. Sequencers were able to store the key-codes played by the musician, then play them back at varying speeds and with assorted transpositions. However the codes were held secret by each company, so there was no chance of competitors' products being connected to them.
K
Published in Philip A. Laplante, Comprehensive Dictionary of Electrical Engineering, 2018
Kilby, Jack St. Clair (2) in an access control system, a value held by a process to permit it to make access to certain objects within the system. key point detection a technique usually employed in specialized linear or morphological filters designed for measuring gray-level changes in several directions. A key point is an isolated image point corresponding to a peculiar physical or geometrical phenomenon in the scene from which the image arises; it can be for example a corner, a line termination, a junction, a bright or dark spot, etc. Key points are distinguished from edges by two properties: they are sparse and display strong graylevel variations in two or more directions (while edge points are grouped into lines, and have graylevel variations essentially in the direction normal to that line). See edge, detection, salient feature. key punch a device with a keyboard used for storing data in paper cards or paper tapes by punching holes. The pattern of holes punched across these cards or tapes represent the data keyed in. Now obsolete. keyboard an input device with a set of buttons (or keys) through which characters are input to a computer. In addition to the keys for inputing characters, a keyboard may also have function keys and special keys, such as power-on or print-screen. keyboard controller the device controller that processes keyboard input. Because of its importance, I/O from the keyboard controller is often handled differently from other I/O processes, with its own direct connection to the CPU. keystone distortion a distortion that presents an image in the shape of a trapezoidal. For projection television displays, off-axis projections of the red and blue tubes can cause keystone distortion. For direct view television displays, unequal deflection sensitivities for the two sections of the deflection yoke can result in keystone distortion. A horizontal trapezoid is the result of the vertical yoke deflection sensitivities. Similarly, a vertical trapezoid is the result of the horizontal yoke deflection sensitivities. KGD See known good die.
Change Is Hard!
Published in Randy K. Kesterson, The Intersection of Change Management and Lean Six Sigma, 2017
Do you have a QWERTY keypad on your computer? No, QWERTY is not a slang term used by one of your friends in Great Britain. QWERTY describes the standard layout on English-language typewriters and keyboards, having Q, W, E, R, T, and Y as the first keys from the left on the top row of letters (see Figure 3.1).
A Usability Study of the Central-Bantu Multilingual Keyboards
Published in International Journal of Human–Computer Interaction, 2021
Thokozani Chimkono, Eunice Mphako-Banda, Amelia Taylor, Pascal Kishindo
A keyboard is a primary device for text-entry in a data-processing equipment. It is important to have a keyboard-usability study as an integral part of keyboard design, as reported by Sloan (2014). Keyboard usability is defined as the ease-of-use and of learning a new keyboard (Hornbundefinedk, 2006; Kiripolskỳ, 2014). Usability is a performance indicator of a new keyboard. The design of new keyboards is guided by the type of letter-frequencies of the text language. Keyboard optimization involves repositioning high-frequency letters into proximity to each other. This facilitates keyboard usability by improving text-entry rate and learn-ability, while minimizing typing errors and physical strain. Since keyboard usability is an important property for a keyboard, keyboard optimization projects employ usability testing at different levels, such as simulation, short-term or long-term experiments. Bi et al. (2012) and Romano et al. (2014) discuss this in detail.
Hybrid estimation of distribution algorithms for solving a keyboard layout problem
Published in Journal of Industrial and Production Engineering, 2018
T.G. Pradeepmon, Vinay V. Panicker, R. Sridharan
A keyboard is a typewriter-like device, which is used to enter data to an electronic device using an arrangement of buttons or keys. A keyboard has characters inscribed or printed on the keys and each key press corresponds to a single written symbol. However, some symbols require pressing or holding of several keys all together or in specific sequence. Most of the keys on the keyboard produce characters, but other keys or simultaneous key presses may produce actions or execute computer commands. Even though there are a number of other input devices, such as mouse, touch screen, pen devices, character recognition and voice recognition, the keyboard remains the most commonly used device for the direct input of alphanumeric data into computers.