fundamentals of computers slide 1 input input is any data entered into the computer’s memory....
TRANSCRIPT
Fundamentals of
Computers
Slide 1
Input
Input is any data entered into the computer’s memory.
Types of input include:Data – Unorganized information (words, numbers, images, or sounds) that the computer converts to meaningful information
1.Software – Programs transferred from storage devices to the computer’s memoryCommands – Instructions that tell the computer what to doResponses – Prompts requiring user feedback
Slide 3
Input Devices: Giving Commands
Keyboard
Mouse
Other Pointing Devices
Slide 10
Audio Input
Computers can accept input from a microphone.An expansion card called a sound card records and
plays back sound files. Sound files contain digitized sound data.Popular sound file formats include:
Windows WAVMoving Pictures Expert Group (MPEG)MP2 and MP3Musical Instrument Digital Interface (MIDI)
Slide 11
Audio Input: Speech Recognition
Speech recognition is a type of input in which the computer recognizes words spoken into a microphone.
Special software and a microphone are required.
Latest technology uses continuous speech recognition where the user does not have to pause between words.
Slide 12
Digital Cameras Digital Video
Click on the picture to play the video.
Digital Input: Digital Cameras and Digital Video
Slide 13
ScannersFlatbed
Fax Machines
Alternative Input Devices
Barcode reader
Slide 16
Output Devices: Engaging our Senses
Output devices are peripheral devices that enable us to view or hear the computer’s processed data. Visual output – Text, graphics, and video
Audio output – Sounds, music, and synthesized speech
Slide 17
Monitors
A monitor is a peripheral device which displays computer output on a screen.
Screen output is referred to as soft copy.
Types of monitors: Cathode-ray tube (CRT)
Liquid Crystal Display (LCD or flat-panel)
CRT LCD
Slide 20
Monitor Specifications
Screen size – The diagonal measurement of the screen surface in inches (15, 17, 19, 21)
Resolution – The sharpness of the image determined by the number of horizontal and vertical dots (pixels) that the screen can display (800 x 600, 1024 x 768, 1600 x 1200)
Refresh rate – The speed at which the screen is redrawn (refreshed) and measured in Hertz (Hz) (60Hz, 75Hz)
Slide 21
Printers
A printer is a peripheral device that produces a physical copy or hard copy of the computer’s output.
Slide 22
Inkjet Laser
Types of Printers
Inkjet printer, also called a bubble-jet, makes characters by inserting dots of ink onto paper
Letter-quality printouts Cost of printer is inexpensive
but ink is costly
Laser printer works like a copier
Quality determined by dots per inch (dpi) produced
Color printers available Expensive initial costs but
cheaper to operate per page
Slide 23
Plotter
A plotter is a printer that uses a pen that moves over a large revolving sheet of paper.
It is used in engineering, drafting, map making, and seismology.
Slide 24
WMA MIDI MP3 WAV
Beethoven 1:15 min
Rocky 2:56 min
Hornsby 48 sec
Cheers 15 sec
Click an icon to play music.
Click the icon again to stop playing.
Try clicking on Cheers while playing music.
Audio Output: Sound Cards and Speakers
Audio output is the ability of the computer to output sound.
Two components are needed:
Sound card – Plays contents of digitized recordings
Speakers – Attach to sound card