Input and output devices
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Input devices allow users to input data and control a computer. Common input devices include keyboards, pointing devices like computer mice, microphones, touch pads, and high-degree of freedom devices used in virtual reality. Output devices allow computers to output data to users, such as audio through speakers or headphones, visual display through monitors or projectors, and printed output through printers. Projectors are also output devices that project images onto surfaces.
![MONITOR
A monitor or a display is an electronic visual
display for computers. The monitor comprises
the display device, circuitry and an enclosure.
The display device in modern monitors is
typically a thin film transistor liquid crystal
display (TFT-LCD) thin panel, while older
monitors used a cathode ray tube (CRT) about as deep as the screen
size
PRINTER
In computing, a printer is a peripheral which
makes a persistent human readable
representation of graphics or text on paper or
similar physical media.[1]
The two most
common printer mechanisms are black and
white laser printers used for common
documents, and color inkjet printers which
can produce high quality photograph quality
output.
PROJECTOR
A projector or image projector is an optical device that projects an
image (or moving images) onto a surface,
commonly a projection screen.
Most projectors create an image by shining a
light through a small transparent lens, but
some newer types of projectors can project
the image directly, by using lasers.](https://image.slidesharecdn.com/inputandoutputdevices-150703074056-lva1-app6891/85/Input-and-output-devices-4-320.jpg)
Input and output devices
- 1. A component or peripheral device (such as a barcode reader, graphic tablet, keyboard, magnetic-stripe reader, modem, mouse, scanner, or stylus) that feeds data or instruction into a computer for display, processing, storage, or outputting or transmission. Input devices convert the user's actions and analog data into digital electronic signals that can be processed by a computer does not require any conversion and is input direct into a computer. It is through input devices that a user exercises control over a computer, its operations, and outputs. KEYBOARDS 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. They act as the main text entry interface for most users. Traditional keyboards use spring-based buttons, though newer variations employ virtual keys, or even projected keyboards. It is typewriter like device composed of a matrix of switches. POINTING DEVICES A COMPUTER MOUSE Pointing devices are the most commonly used input devices today. A pointing device is any human interface device that allows a user to input spatial data to a computer. In the case of mice and touchpads, this is usually achieved by detecting movement across a physical surface. INPUT DEVICES
- 2. MICROPHONE An instrument that converts sound waves into an electric current, usually fed into an amplifier, a recorder, or a broadcast transmitter. TOUCH PAD A touchpad /ˈtʌtʃpæd/ or trackpad /ˈtrækpæd/ is a pointing device featuring a tactile sensor, a specialized surface that can translate the motion and position of a user's fingers to a relative position on the operating system that is outputted to the screen 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 virtual reality systems (CAVEs), where input that registers six degrees of freedom is required.
- 3. An output device is any device used to send data from a computer to another device or user. Most computer data output that is meant for humans is in the form of audio or video. Thus, most output devices used by humans are in these categories. Examples include monitors, projectors, speakers, headphones and printers SPEAKER Computer speakers, or multimedia speakers, are speakers external to a computer, that disable the lower fidelity built-in speaker. They often have a low- power internal amplifier. The standard audio connection is a 3.5 mm (approximately 1/8 inch) stereo phone connector often color-coded lime green (following the PC 99 standard) for computer sound cards HEADPHONES Headphones (or "head-phones" in the early days of telephony and radio) are a pair of small loudspeakers that are designed to be held in place close to a user's ears. OUPUT DEVICES
- 4. MONITOR A monitor or a display is an electronic visual display for computers. The monitor comprises the display device, circuitry and an enclosure. The display device in modern monitors is typically a thin film transistor liquid crystal display (TFT-LCD) thin panel, while older monitors used a cathode ray tube (CRT) about as deep as the screen size PRINTER In computing, a printer is a peripheral which makes a persistent human readable representation of graphics or text on paper or similar physical media.[1] The two most common printer mechanisms are black and white laser printers used for common documents, and color inkjet printers which can produce high quality photograph quality output. PROJECTOR A projector or image projector is an optical device that projects an image (or moving images) onto a surface, commonly a projection screen. Most projectors create an image by shining a light through a small transparent lens, but some newer types of projectors can project the image directly, by using lasers.