2.1 Data

Question 1

Analogue Data

Answer 1

Data that is represented in a physical way - eg: grooves in a record

Question 2

Digital Data

Answer 2

Pattern of binary numbers that can be interpreted by various technologies - shown as 1 and 0

Question 3

Analogue Devices

Answer 3

• interpret analogue data is a set way (record player)
• Digital devices are generally able to interpret a wide variety of digital data, edit it and transform it

Question 4

Digital Devices

Answer 4

• less precise and have a lower quality than analogue data
• take up less physical space
• subject to deterioration
• uses a continuous range of values to represent information where digital data uses discontinuous values

Question 5

Analogue Values

Answer 5

To use them with a digital data device the data must be converted using a converter - ADC or DAC

Question 6

Converting Analogue to Digital

Answer 6

First the data is sampled, the a numeric value is assigned and then sorted as binary

Question 7

Sound

Answer 7

• Digital Representation is achieved by sampling (signal processing)
• sample quality can be affected by the sample fair and sample frequency
• the higher the sample rate + frequency, the larger the resultant sample
• the size of the storage requirement will depend on the sample rate, resolution and sound length

Question 8

Light

Answer 8

Easter graphics are dot matrix data structures representing a gird of pixels and cannot scale up without loss of apparent quality - tend to be large in terms of memory required to store them

Question 9

Bitmap Images

Answer 9

Type of raster image and are composed of many tiny parts called pixels, which are often many different colours - high quality = high number of pixels

Question 10

Flash Drive

Answer 10

A memory stick that has a 2FP-2 capacity and is very durable but is expensive

Question 11

External Hard Drive

Answer 11

A hard disk that isn’t very durable but is speedy and cheap

Question 12

Magnetic Tape

Answer 12

Very durable and cheap but slow - disk/tape

Question 13

CD/DVD/Blu-ray

Answer 13

A DVD that comes in a range of capacities and is very cheap but it is slow

Question 14

Pixels

Answer 14

Small individual dots that are displayed on a computer. An image is made up of multiple pixels. The quality of the image depends on number of pixels per inch

Question 15

Resolution

Answer 15

Number of pixels per unit of measurement, the image quality and an image that has a high resolution allows clear and sharp, realistic images to be stored and viewed
High resolution images = large file size = more time to download

Question 16

Vector Graphs

Answer 16

Geometric primitive such as points, lines, curves, shapes or polygons based on mathematical expressions to represent images. Vector graphs can be scaled without loss of quality

Question 17

Moving Images

Answer 17

• can be streamed from websites and this allows files to be processed and viewed before the file has been downloaded
• streaming allows video to download in background while something is playing
• buffer is temporary storage area used to hold downloaded sections of video

Question 18

Data Represented

Answer 18

In 1 or 0

Question 19

Bit

Answer 19

1 or 0

Question 20

Nybble

Answer 20

4 bits (1/2 bytes)

Question 21

Byte

Answer 21

8 bits

Question 22

Kilobyte

Answer 22

1024 bytes

Question 23

Megabyte

Answer 23

1024 KB

Question 24

Gigabyte

Answer 24

1024 MB

Question 25

Terabyte

Answer 25

1024 GB

Question 26

Petabyte

Answer 26

1024 TB

Question 27

Optical Storage

Answer 27

CD/DVD/Blu-ray

Question 28

Cloud Storage

Answer 28

Storing data on the cloud

Question 29

Solid State Storage

Answer 29

Flash/SD