Describe
the types of output
What is Input ?
In computing, 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 or other information appliance Input and output devices make up the hardware interface between a computer and a scanner or 6DOF controller.
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 set up to simulate a relative input mode where the stylus
or puck can be lifted and repositioned.
EXAMPLE:
Keyboards
A 'keyboard' is a human interface device
which is represented as a layout of buttons. Ears 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 keybords.
Pointing devices
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 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 pointer, creating a simple, intuitive way to navigate a computer's GUI.
Composite devices
Input devices, such as buttons and joysticks, can be combined on a
single physical device that could be thought of as a composite device.
Many gaming
devices have controllers like this. Technically mice are composite
devices, as they both track movement and provide buttons for clicking,
but composite devices are generally considered to have more than two
different forms of input.
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.
(Image scanner)
What is Output ?
An output device is any piece of computer hardware equipment used to communicate the results of data processing carried out by an information processing system (such as a computer) to the outside world.
In computing, input/output, or I/O, refers to the communication between an information processing system (such as a computer),
and the outside world. Inputs are the signals or data sent to the
system, and outputs are the signals or data sent by the system to the
outside.
Examples of output devices:
- Speakers
- Headphones
- Screen (monitor)
- Printer
Computer 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 jack plug often color-coded lime green (following the PC 99 standard) for computer sound cards. A plug and socket for a two-wire (signal and ground) coaxial cable is widely used to connect analog
audio and video components. Rows of RCA sockets are found on the backs
of stereo amplifier and numerous A/V products. The prong is 1/8" thick
by 5/16" long. A few use an RCA connector for input. There are also USB speakers which are powered from the 5 volts at 500 milliamps provided by the USB port, allowing about 2.5 watts of output power.
Headphones
Headphones are a pair of small loudspeakers which are designed to be held in place close to a user's ears. Headphones have wires which allow them to be connected to a signal source such as an audio amplifier, radio, CD players, or portable media player. They are also known as stereophones or, colloquially, cans. The in-ear versions are known as earphones or earbuds. In the context of telecommunication, the term headset is used to describe a combination of headphone and microphone used for 20th century.
Computer monitor
A monitor or display (also called screen or visual display unit) 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 use a cathode ray tube about as deep as the screen size.
Printer (computing)
In computing, a printer is a peripheral which produces a text or graphics of documents stored in electronic
form, usually on physical print media such as paper or transparencies.
Many printers are primarily used as local peripherals, and are attached
by a printer cable or, in most new printers, a USB cable to a computer which serves as a document source. Some printers, commonly known as network printers, have built-in network interfaces, typically wireless or Ethernet
based, and can serve as a hard copy device for any user on the network.
Individual printers are often designed to support both local and
network connected users at the same time. In addition, a few modern
printers can directly interface to electronic media such as memory cards, or to image capture devices such as digital cameras and scanners; some printers are combined with scanners or fax machines in a single unit, and can function as photocopies.
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