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An input device is any peripheral (piece of computer hardware equipment) used to provide data and control signals to an information processing system (such as a computer). Input and output devices make up the hardware interface between a computer as a scanner or 6DOF controller.
History of computer devices
absolute (e.g. on a touch screen) or relative (e.g. with a mouse that can be lifted and repositioned)
Note that direct input is almost necessarily absolute, but indirect input may be either absolute or relative. For example, digitizing Graphics tablets that do not have an embedded screen involve indirect input, and sense absolute positions and are often run in an absolute input mode, but they may also be setup to simulate a relative input mode where the stylus or puck can be lifted and repositioned.
1 Early devices
3 Pointing devices
4 High-degree of freedom input devices
5 Composite devices
6 Imaging and Video input devices
7 Audio input devices
 Early devices
Unit record equipment
Main article: Computer keyboard
A keyboard is a human interface device which is represented as a layout of buttons. Each button, or key, can be used to either input a linguistic character to a computer, or to call upon a particular function of the computer. Traditional keyboards use spring-based buttons, though newer variations employ virtual keys, or even projected keyboards.
Examples of types of keyboards include:
 Pointing devices
Main article: Pointing device
A computer mouseA pointing device is any human interface device that allows a user to input spatial data to a computer. In the case of mice and touch screens, this is usually achieved by detecting movement across a physical surface. Analog devices, such as 3D mice, joysticks, or pointing sticks, function by reporting their angle of deflection. Movements of the pointing device are echoed on the screen by movements of the cursor, creating a simple, intuitive way to navigate a computer’s GUI.
 High-degree of freedom input devices
Some devices allow many continuous degrees of freedom as input. These can be used as pointing devices, but are generally used in ways that don’t involve pointing to a location in space, such as the control of a camera angle while in 3D applications. These kinds of devices are typically used in CAVEs, where input that registers 6DOF is
 Composite devices
 Imaging and Video input devices
Video input devices are used to digitize images or video from the outside world into the computer. The information can be stored in a multitude of formats depending on the user’s requirement.
Magnetic resonance imaging
Positron emission tomography
 Audio input devices
In the fashion of video devices, audio devices are used to either capture or create sound. In some cases, an audio output device can be used as an input device, in order to capture produced sound.
then you can play it back
MIDI keyboard or other digital musical instrument
Instrument to Computer cords, such as the Stealth Plug for the guitar