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Electromagnetic devices are another technique for tracking tongue and lip movements. [4] The detection of speech movements by electromyography of speech articulator muscles and the larynx is another technique. [5] [6] Another source of information is the vocal tract resonance signals that get transmitted through bone conduction called non ...
Direct access methods involve physical contact with the system, by using a keyboard or a touch screen. Users accessing SGDs indirectly and through specialized devices must manipulate an object in order to access the system, such as maneuvering a joystick, head mouse, optical head pointer, light pointer, infrared pointer, or switch access ...
[1] [2] The absolute threshold is not a discrete point and is therefore classed as the point at which a sound elicits a response a specified percentage of the time. [ 1 ] The threshold of hearing is generally reported in reference to the RMS sound pressure of 20 micropascals , i.e. 0 dB SPL, corresponding to a sound intensity of 0.98 pW/m 2 at ...
For simple software, when the mouse starts to move, the software will count the number of "counts" or "mickeys" received from the mouse and will move the cursor across the screen by that number of pixels (or multiplied by a rate factor, typically less than 1). The cursor will move slowly on the screen, with good precision.
A trackball is a pointing device consisting of a ball housed in a socket containing sensors to detect rotation of the ball about two axis, similar to an upside-down mouse: as the user rolls the ball with a thumb, fingers, or palm the pointer on the screen will also move. Tracker balls are commonly used on CAD workstations for ease of use, where ...
A voice command device is a device controlled with a voice user interface. Voice user interfaces have been added to automobiles , home automation systems, computer operating systems , home appliances like washing machines and microwave ovens , and television remote controls .
The mouse emits a faint clicking sound when the scroll ball is rolled or the side squeeze sensors are depressed, but this is not directly caused by the ball moving or side buttons being pressed; the sound is actually produced by a tiny speaker inside the mouse. [6]
Context sensitivity is ubiquitous in current graphical user interfaces, often in context menus. A user-interface may also provide context sensitive feedback, such as changing the appearance of the mouse pointer or cursor, changing the menu color, or with auditory or tactile feedback.