7. Input-Output Devices Flashcards
What allows a user to connect a single keyboard, video display device, and mouse to multiple computers
a keyboard, video, mouse (KVM) switch
Which scanner reads data based on the reflection of white spaces between black bars
barcode scanner
What is the purpose of a capture card
It allows you to send a video or TV signal to your computer
Biometric device
A device that allows access to a computer or device by identifying a person through one of their unique physical characteristics
Camcorder
A hand-held device used to record live-action video and audio
Digital Camera
A hand-held device that records still images digitally instead of on photographic film
Input Device
A device that accepts information from the user and passes it to the computer for processing
Joystick
A device that controls the movement of the cursor on the screen
KVM switch
Keyboard, Video, Mouse switch
Keyboard, Video, Mouse (KVM) switch
A switch that allows a user to use one keyboard, mouse, and display device for multiple computers
speaker
a device which convers an electrical audio signal into a corresponding sound
Touch Screen
A display device that senses touch on its surface, then translates that touch to user input data
Touchpad
An input device where users move their fingers over a touch-sensitive surface to move the pointer around the screen
barcode reader
a handheld scanner used to read the group of thick and think lines (called a barcode) printed on various products
digitizer
used to convert hand-drawn pictures into digital images that can be manipulated user computer software. You draw on the digitzer’s screen and what you draw is digitally rendered into the computer
Signature pad
Used to digitize handwritted signatures, for example, to accept credit card signatures at the point of sale terminals
gamepad
a hand-held device used to play video games
microphomne
a device used to input audio into a comptuer
motion sensor
an electronic senor that detects physical motion in an envrionment.
scanner
- captures printed photos and images for editing on a computer
scanner types
- hand held
- flatbed
- automatic document feeder (ADF)
NFC reader
reads contactless paymet cards of inventory trackign tags using near filed communications technologies
webcam
a video camera that transmits live video over the internet
Three main computer output devices
- Display
- Printer
- Speakers
Important combined I/O devices include
- Audio headsets
- KVM switches
- Set top boxes
- Smart TVs
- touchscreen displays
- MIDI instruments
KVMP
Keyboard video mouse, peripheral
STB
set top box
STU
set top unit
set top unit (STU)
alternative name for set top box
Set top box
received digital audio and video singals then send those signals to a display (such as TV or computer display)
touch screen types
- Resistive
- capactive
- surface acoustic wave
resistive touchscreen
- uses two layers, a layer of glass and a conductive and resistive meyal layer with an electical current running between them. When you touch the screen, pressure on the screen makes the layers touch and there is a change in electical current in that spot
- only register touch in one spot at a time
- easiest and cheapest to manufacture
- require frequent calibration
- common in older device, but less frequent in modern devices
capactive touchscreen
- dual layer
- the layer with the electical charge is placed directly on the glass panel.
- when you touch the creen, some of the charge is transferred to you, causing a decress in electical charge at that location on the screen.
- the coordinates of the change in charge are sent to the os and the software translates this info into the correct user input
- capactive touchscreens work well with multi-touch
- require little calibration
- dominant modenr touchscreen tech
surface acoustic wave technologu
- uses a glass panel with a receiving and sending tranducer mounted along the sides of the panel
- touch the glass panel istrubs the wave allowing the receiving transducer to identify the touch event.
- can use almost any object for input
- best for displaying detailed graphics because it has not metal layer allong for 100% throughput from the display
- doesn’t support multitouch
- more expensive than other touch screen tech
