Chapter 5 (sec. 5.1 and 5.2) Intro to Computing f
Terms
undefined, object
copy deck
- consists of devices that translate data into a form the computer can process
- Input hardware
- consists of devices that translate info processed by the computer into a form that humans can understand
- Output hardware
- a device that converts letters, numbers, and other characters into electrical signals that can be read by the computer's processor
- keyboard
- also called a "video display terminal (VDT)", has a display screen and a keyboard and can input and output but cannot process data
- dumb terminal
- has its own memory and processor, as well as a display screen and a keyboard
- intelligent terminal
- provides access to the internet
- internet terminal
- unfolds, then once driver is installed, you can simply clip a PDA onto it, which runs off the PDA's power, thus requiring no external power source
- PDA keyboard
- control the position of the cursor or pointer on the screen and allow the user to select options displayed on the screen
- Pointing devices
- a movable ball, mounted on top of a stationary device, that can be rotated using your fingers or palm
- trackball
- a small, flat surface over which you slide your finger, using the same movements as you would with a mouse
- touchpad
- looks like a pencil eraser protruding from the keyboard between the G, H, and B keys. When you move it with your finger, the screen pointer moves accordingly.
- pointing stick
- a light-sensitive penlike device that uses a wired connection to a computer terminal
- light pen
- uses an electronic pen or a mouselike copying device called a "puck" that can convert drawings and photos to digital data
- digitizer
- create machine-readable data on magnetic media or paper or feed it directly into the computer's processor
- source data-entry devices
- use light-sensing (optical) equipment to translate images of text, drawings, photos, and the like into digital form
- scanners
- works much like a photocopier-- the image being scanned is placed on a glass surface, where it remains stationary, and the scanning beam moves across it
- flatbed scanner
- are photoelectric (optical) scanners that translate the symbols in the bar code into digital code
- bar-code readers
- a character-recoginition system that uses magnetizable ink and special characters
- MICR (magnetic-ink character recognition)
- uses a special scanner that reads "bubble" marks and converts them into computer-usable form
- OMR (optical mark recognition)
- software converts scanned text from images (pictures of the text) to an editable text format (usually ASCII) that can be imported into a word processing application and manipulated
- OCR (optical character recognition)
- scans an image and sends it as electronic signals over telephone lines to a receiving one of these, which prints out the image on paper
- fax machine
- specialized devices that do nothing except send and receive fax documents
- dedicated fax machines
- installed as a circuit board inside the computer's system cabinet; enables you to send signals directly from your computer to someone else's fax machine or computer _______
- fax modem
- records analog sound and translates it for digital storage and processing
- audio-input device
- an add-on circuit board in a computer that converts analog sound to digital sound and stores it for further processing and/or playes it back, providing output directly to speakers or an external amplifier
- sound board
- uses a standard for the interchange of musical info between musical instruments, synthesizers, and computers
- MIDI board (Musical Instrument Digital Interface)
- a video camera attached to a computer to record live moving images that can then be posted on a website in real time
- webcam
- can capture and digitize only a single frame at a time
- frame-grabber video card
- can convert analog to digital signals at rates up to 30 frames per sec., giving the effect of a continously flowing motion picture
- full-motion video card
- uses a light-sensitve processor chip to capture photographic images in digital form and store them on a small diskette inserted into the camera or on a flash memory cards
- digital camera
- can also be used for web surfing, playing games, and downloading music, enabling you to visually share your vacation experiences in real time
- camera phones
- using a microphone (or a telephone) as an input device, converts a person's speech into digital signals by comparing the electrical patterns procuced by the speaker's voice with a set of prerecorded patterns stored in the computer
- speech-recognition system
- are based on an identifying tag bearing a microchip that contains specific code numbers. These code numbers are read by the radio waves of a scanner linked to a database.
- RFID (radio-frequency identification)