Topic 4- Selection And Use Of Input Drvised And Input Media: Simple Devices

Question 0

Input devices

Answer 0

• voice recognition
• mouse
• keyboard
• scanners
• webcams
• joystick

Question 1

Keyboard entry disadvantages and advantages

Answer 1

• slow
• costly (someone has to be paid to enter the data)
• prone to errors(Easy to make mistakes)
• health problems (rsi)
• cheap from a purchase point of view
• universal use (most people know how to use a keyboard)

Question 2

Mouse

Answer 2

I put device because it allows you to make selections as well as draw lines and size graphic objects

Question 3

Scanning

Answer 3

Input devices that can be used to capture an image and are useful for digesting old non-digital photographs, paper documents or pictures in books

Question 4

Speech/voice recognition

Adv&disadv

Answer 4

-allow you to enter data via a microphone directly into a computer. Only microphone and voice recognition software needed
Adv:
-faster than typing
-99% accuracy
-cheap (many computers come with a microphone)
Dis’adv:
-takes a while to get used to
- not accurate at first (may need to train system about your voice)
-errors due to background noise(can’t be used in offices unless people have their own office)

Question 5

The data encoded in the magnetic strip of a credit or debit card includes

Answer 5

• the account number
• the expiry date of the card
• other security information

Question 6

Touch screens definition

What it is used for

Advantages

Answer 6

1. Allow A person to make selections by simply touching the screen
2. -used as input devices for purchasing train tickets or used as information points in tourist information offices, art galleries and museums
   - also be used to provide information on services provided by banks and building societies
3. -it is simple and capable of being used by almost anyone

Question 7

Advantages of magnetic strip input include

Answer 7

• fewer errors- there are fewer errors made because there is no keying in of data
• adding security- because there are security details encoded in the card which do not appear on the card, making it harder to commit fraud.
• very quick- the card is read quickly
• Data cannot be read without a properly programmed machine

Question 8

Bar code recognition
What does it do
What does it read

Answer 8

Bar code recognition involves using a series of light and dark bars of differing widths to enter a code which is usually printed underneath the bar code
-using the code, system can determine from a product database the country of origin, manufacturer, name of product, price, parcel tracking syste,

Question 9

Advantages of bar code Input

Answer 9

• Faster-scanners are sophisticated and can read bar codes at different angles
• more accurate- compared to typing in long codes manually
• low printing costs- can be printed on labels. You can buy special software which allows an ordinary printer to print bar codes

Question 10

Disadvantage of bar code input

Answer 10

• can only be used for the input of number

- expensive- the laser scanners in supermarkets are expensive, although hand-held scanners are relatively cheap

Question 11

POS terminals

Input devices used with POS terminals

Answer 11

Point of sale terminals are placed in stores where customers pay for goods

• touch screen displays
• keyboard
• magnetic strip readers (for reading credit/debit cards)
• barcode reader

Question 12

Hand-held input devices

Used by _________ to take

Answer 12

Used by meter readers to take readings of gas, electricity and water meters In homes
Meter reader takes the reading and then inputs the informations into a hand-held device which uses wireless communication to send the data to the main computer system

Question 13

Input media

Answer 13

Is the material on which the data I seconded so that it can be read by an input device and digitised so that it can be input, processed and turned into information by the ict system

Question 14

Examples of input media

Answer 14

• forms with marks on them capable of being read by an optical mark reader
• a bar code
• a magnetic on a credit/ debit card, loyalty or member card
• CD-ROM used to supply the printer driver for a new printer
• a picture card used by a digital camera

Question 15

Optical mark recognition ( OMR)

Answer 15

• paper-based forms or cards with marks on the are read automatically
• can read 3000 sheets per hour
• ideal method for marking multiple choice question answer sheets for examinations and tests

Question 16

Advantages of optical mark recognition

Answer 16

• easy to use only need one computer and optical mark reader
• cheap-cheap compared to other input devices
• fairly accurate
• fast (important for large amounts of data needs to be input and processed in a short space of time e.g exams and tests)

Question 17

Disadvantages of optical mark recognition (OMR)

Answer 17

• only suitable for capturing certain data- data needs to be in a form where there are tick style questions
• reject rate can be high- if instructions aren’t precise users may fill in the forms incorrectly which will lead to high rejection rates
• if the form is creased or folded it may be rejected or jam the machine

Question 18

Applications for optical mark recognition

Answer 18

• voting forms
• lottery tickets
• tests/assessments
• time sheets (used to record the time you started and finished each day to work out wages)
• school/college attendance register

Question 19

Optical character recognition (OCR)

Answer 19

• uses a scanner as the input device and special software which looks at the shape of each character so that it can be recognised separately
• the software can then convert the image of each letter to text, which can be passed to another software package e.g word processor or database so it can be processed

Question 20

Magnetic ink character recognition(MICR)

Answer 20

Number are printed onto the cheque which can be read by the magnetic ink character reader

Question 21

Advantages of MICR

Answer 21

• accuracy: documents (usually cheques are read with 100% accuracy
• difficult to forge because of the sophisticated magnetic ink technology used
• can be read easily. Cheques are often crumpled up

Question 22

Advantages of MICR

Answer 22

• accuracy: documents (usually cheques are read with 100% accuracy)
• difficult to forge because of the sophisticated magnetic ink technology used
• can be read easily. Cheques are often folded&crumpled. OMR or OCR wouldn’t work with this however MICR uses a magnetic pattern>unaffected
• Documents can be read at very high speeds (important for clearing of cheques)