Computer Chapter 7 Test

bar code reader

"care code scanner"; uses laser beams to read bar code.

graphics tablet

"digitizer"; electronic plastic board that detects and converts movements made with stylus or digital pen.

motion input

"gesture recognition"; users guide elements using air gestures; although intended for gaming, also used for other things. ex: military, medical field.

all-in-1 printers

"multifunction printers"; prints, scans, copies, faxes.

voice recognition

"speech recognition"; computer's capability to distinguish spoken words.

what is speed in printers measured by?

# of papers it can print per minute

how can visually impaired individuals use computer? (not blind)

-change screen settings to increase text size or change color.

what are some things RFID can do?

-track locations -track times ran in marathons -check lift tickets of skiers -manage inventory -check out lib books -provide access to room/building -open gates to communities

how can users with limited hand mobility use a keyboard?

-use an on-screen one -bigger keys -head-mounted pointer to control stuff

how can BLIND people use computers?

-use voice output -braille printer

POSTNET

US postal service

PictBridge

allows you to print pictures directly from camera.

display port

alternative to DVI that also supports HDMI.

input

any data/instructions entered into the memory of a computer.

speaker

attaches to computer, game consul, and mobile devices to generate high quality sound.

what are the 4 types of output data

audio, video, graphics, text.

how can hearing impaired individuals use computer?

can display words instead of sound.

video input

captures full-motion image and stores them in devices storage medium.

OCR software

converts scanned item into text file so it can be read/edited by word.

large format printer

creates photo-realistic quality color prints.

output

data that has processed into useful form.

barcode

data that identifies manufacturer and item.

contrast ratio

difference in light intensity between brightest white and darkest black that can be produced. *ranges from 500:1 to 2000:1 *higher= better color.

DVI

digital video interface; enables digital signals to transmit directly to monitor.

monitor

display that is packaged as a separate peripheral device.

nonimpact printer

forms characters and graphics on paper w/out actually contacting the paper.

thermal printers

generates image by pushing heated pins against paper.

HDMI

high definition media interface; port combines DVI and HD tv and video.

keyboard

input device that contains keys users press to enter data/instructions into the computer/device. (toggle keys, directional keys, function keys & arrows, tying area)

scanner

light sensing device that reads printed text/graphics and translates the results into a form the computer can read.

black light

light source that uses CCFL (cold cathode fluorescent lamp) and LED (light emitting diode) technology.

LCD

liquid crystal display; liquid sandwiched between 2 sheets of material that presents sharp, flicker-free images on screen when illuminated.

MICR

magnetic ink character recognition; reads text printed w/ ink and converts characters to something computers can read. ex: banking checks

DV

means "digital video"; it records video as digital signals; you can transfer this directly to device.

brightness

measured in nits (unit of visible light intensity); ranges from 250-550 nits. (higher number means brighter)

video conference

meeting between 2 people over internet with geographic distance between them.

touch mouse

mouse that recognizes touch gestures, in addition to detecting movement & traditional click and scroll options.

laser mouse

mouse that uses laser sensors to emit and sense light to detect mouse movements.

optical mouse

mouse that uses optical sensors to emit and sense light to detect mouse movements.

ergonomic mouse

mouse that will help reduce chance of RDI's or reduce other pain/discomfort associated with repetitive stress injuries.

data collection device

obtains data directly at location where transaction or event takes place; used with wired or wireless connections. ex: smart phones

OCR

optical character recognition; reads and converts text documents to electronic files w/out the need to rekey them. ex: if you print out 8 pages but you cant find them on computer, you use OCR.

OMR

optical mark recognition; reads hand-drawn marks. ex: "bubble sheets" graded by OMR.

dot pitch

pixel pitch; distance in millimeters between pixels on display. *smaller dot pitch= easier to read *average dot pitch= .30 mm or lower *lower=sharper

mouse

pointing device that fits into the palm of your hand comfortably.

voice/audio input

process of entering any sound into computer such as speech, music, sound effects.

plotters

produces high quality drawings

printer

produces text and graphics on a physical piece of paper.

QR code

quick response code; 2D bar code, stores info in both horizontal and vertical direction; info can be web address or electronic business card. *read with app*

RFID

radio frequency identification; uses radio signals to communicate w/ a tag placed in/attached to an object, animal, or person. tags contain memory chips.

magstripe readers

read magstripe on back of card. ex: NW or faculty ID

what does the quality of display depend on?

resolution and # of horizontal/vertical pixels.

UPC barcode

retail/grocery stores

pointing stick

shaped like a pencil eraser; located between G and H on keyboard.

flatbed

similar to copy machine; but copies file of the document in memory instead of copy paper.

digital pen

slightly larger than stylus, captures and converts users handwriting or drawing into digital format.

pointing devices

small symbol on screen that changes shape when user moves it; can select text, graphics, or other buttons.

mobile printer

small, lightweight, battery operated; prints from mobile device.

audio input

speaking into microphone that is built into computer

ink-jet printer

sprays drops of liquid ink on paper

different keyboards and their info (5):

standard: found on desktop computers compact: built in laptop keyboards; doesn't include numeric keypad. clip on: used by tablet/mobile device. on-screen: used by slate tablets/smart phones. ergonomic: designed to reduce the chance of strain injuries.

trackball

stationary device with ball on top or side.

impact printer

strikes mechanism against inked ribbon that physically contacts paper; ideal for printing multi-part forms b/c you can go through many sheets.

data projector

takes text/image from computer and displays on larger screen.

response time

time it takes to turn pixel on/off; ranges from 2-16 milliseconds. (lower the number the faster the response time)

touch screen

touch sensitive display device; found on smart phones/mobile devices/laptops.

interactive whiteboard

touch-sensitive device, resembles dry-erase board, displays image on connect computer screen.

pen input

touching stylus or digital pen on flat surface to write/draw/make selections.

webcam

type of DV camera; enables user to capture video/still images, send email messages with video attachment, add live images to IM, broadcast live images, make video calls, and conduct video conference.

photo printer

uses ink-jet technology, produces lab quality pics

optical reader

uses light source to read characters, marks, and codes and converts to digital data.