Audio Definition

Audio/Video & Graphics Definitions Rev 1.2


Audio technology is the application of technologies in the areas of music, sound design and diffusion, acoustics, sound synthesis, digital signal processing, and psychoacoustics. In human-computer interaction, computers use Audio technology to notify, signal, alert, or interact with humans in programmatic fashion.


The term video (from the Latin for "I see") commonly refers to several storage formats for moving pictures: digital video formats, including DVD, and MPEG-4; and analog videotapes, including VHS and Betamax. Video can be recorded and transmitted in various physical media: in magnetic tape when recorded as PAL or NTSC electric signals by video cameras, or in MPEG-4 or DV digital media when recorded by digital cameras. A computer display or computer monitor is an output device that is part of a computer's display system. A cable connects the monitor to a video adapter (video card) that is installed in an expansion slot on the computers motherboard. This system converts signals into text and pictures and displays them on a TV-like screen (the monitor).


Graphics are visual presentations on some surface such as a wall, canvas, computer screen, paper, or stone to brand, inform, illustrate, or entertain. Examples are photographs, drawings, Line Art, graphs, diagrams, typography, numbers, symbols, geometric designs, maps, engineering drawings, or other images. A Graphics Processing Unit or GPU is a dedicated graphics rendering device for a personal computer, workstation, or game console. Modern GPUs are very efficient at manipulating and displaying computer graphics, and their highly parallel structure makes them more effective than typical CPUs for a range of complex algorithms. The most powerful class of GPUs typically interface with the motherboard by means of an expansion slot such as PCI Express Graphics or Accelerated Graphics Port and can usually be replaced or upgraded with relative ease.


A display device, also known as an information display is a device for visual or tactile presentation of images (including text) acquired, stored, or transmitted in various forms. While most common displays are designed to present information dynamically in a visual medium, tactile displays, usually intended for the blind or visually impaired, use mechanical parts to dynamically update a tactile image (usually of text) so that the image may be felt by the fingers.

Human Input

In human-computer interaction, input is the information produced by the user with the purpose of controlling the computer program. The user interface determines what kinds of input the program accepts (for example, control strings or text typed with keyboard and mouse clicks). Human Input interacts with programs running a computer, taking input from a broad range of human emotion, which now includes sight, touch, taste, hearing, and smell.

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