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Lecture 3: Input and Output Devices. Computer Literacy Bishop Alemany High School Summer Session. Input Devices. input –The first stage of in formation processing; consists of data and programs that are fed into the computer system

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lecture 3 input and output devices

Lecture 3: Input and Output Devices

Computer Literacy

Bishop Alemany High School

Summer Session

input devices
Input Devices
  • input –The first stage of information processing; consists of data and programs that are fed into the computer system
  • input devices –hardware components that capture, collect, and transmit data and programs in a way that the computer can understand
input devices1
Input Devices

keyboard

  • GUI (graphical user interface)
  • Mouse
  • Joysticks
  • Touch screens
  • Scanner
  • Voice Input
  • Video Capture
output devices
Output Devices
  • Output – processed data; usually text, graphics, or sound that can be immediately used by people or stored by the computer for later use.
  • Two types of output

1. Hard copy – recorded on a tangible medium (paper)

2. Soft copy – temporary version

(monitor screen)

printers
Printers
  • 2 types of Printers:

1. Impact printers – creates text and graphics by physically striking the paper; inkjet

2. Non–Impact printers – melts toner powder onto paper like a copy machine;laser printers

monitors
Monitors
  • The clarity of images displayed on the monitor is directly related to pixel density and screen resolution
  • Pixel Density – is measured by the number of pixels across the screen and the number of pixels down the screen
    • the higher the pixel density, the better looking the image since there are more pixels!
  • Screen Resolution - common sizes:

640 x 480, 1024 x 728, 1280 x 1024

monitors continued
Monitors – (continued)
  • CRT = Cathode Ray Tube – glass casing, vacuum tube
  • LCD = Liquid Crystal Display – each pixel is illuminated by three separate LCD glass panels (red, blue, green)
  • DLP = each pixel is illuminated by a DLP chip which contains a reflective surface made up of thousands of tiny mirrors;
  • PLASMA = each pixel is illuminated by tiny fluorescent lights (red, green and blue) to form an image
high vs standard definition
High vs. Standard Definition
  • All screens “refresh” the picture in one of two ways:

1. Interlaced – an analog signal; lines are refreshed in two fields, “odds” and “evens”, one after the other

2. Progressive – a digital signal; all lines are refreshed at the same time resulting in a clearer picture

  • Standard Definition = 480i (interlaced)
  • Hi Definition = 480p, 720p, 1080i, 1080p (progressive)
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