Objectives:
- List several examples of input devices and explain how they can make it easier to get different types of information into the computer.
- List several examples of output devices and the explain how they make computers more useful.
- Explain why a typical computer has different types of storage devices.
Diagram how the components of a computer system fit together.
Input: From Person to Processor
- Keyboard
>The most familiar input device
- Used to enter letters, numbers and special characters
- Standard keyboard
- Ergonomic keyboards
>To address possible medical problems
- Wireless keyboard
- Folding keyboards
>Used with palm-sized computers
- One-handed keyboards
- Keyboards printed on membranes
Pointing Devices
>Mouse
>Touchpad
>Pointing stick
>Trackball
>Joystick
>Graphics tablet
>Touch screen
>Stylus
Reading Tools
- Read marks representing codes specifically designed for computer input
>Magnetic-ink character readers
>Optical-mark readers
>Bar-code readers
>Pen scanners
>Tablet PC
>Smart whiteboard
>Radio Frequency Identification Readers (RFID)
Scanners capture and digitize printed images.
- Flatbed
- Slide
- Drum
- Sheet-fed
Digital camera
- Snapshots captured as digital images
- Digital images stored as bit patterns on disks or other digital storage media
Video digitizer
- Capture input from a:
>Video camera
>Video cassette recorder or television
- Convert it to a digital signal
>Stored in memory and displayed on computer screens
- Videoconferencing
>People in diverse locations can see and hear each other
>Used to conduct long-distance meetings
>Video images transmitted through networks
Audio digitizers
- Digitize sounds from
>Microphones
>Other input devices
- Digital signals can be
>Stored
>Further processed with specialized software
A digital signal processing chip
compresses the stream of bits before
it is transmitted to the CPU
Speech recognition software
- Converts voice data into words that can be edited and printed
Sensors
- Designed to monitor physical conditions
>Temperature, humidity, pressure
- Provide data used in:
>Robotics
>Environmental climate control
>Weather forecasting
>Medical monitoring
>Biofeedback
>Scientific research
