Chapter 1 Digital Data

Question 1

What is Data?

Answer 1

Raw, unorganized facts with no context or meaning.

Question 2

What is information?

Answer 2

Data that had been processed, organized and has context or meaning.

Question 3

What is Sample Rate?

Answer 3

How many samples or measurements of audio recording are taken per second. The more samples taken the higher the quality.

Question 4

What is the Bit Rate

Answer 4

Tells you how many bits can be processed per second. Measured in Kilobits per second. (kbps)

Question 5

What does ADC stand for and what does it do?

Answer 5

Analogue to Digital Converter

Converts sound waves to digital waves that are easier for a computer to read. Measured in Hertz. (Hz)

Question 6

What is Streaming? Give one advantage and one disadvantage.

Answer 6

Listening to music or watching a movie in ‘real time’, instead of downloading a file and watching/Listening to it later.

Advantage: Accessible + doesn’t take up storage.
Disadvantage: Costly, Needs internet connection

Question 7

What is Buffering?

Answer 7

Preloading data into a reserved area of memory called ‘The Buffer’.

Question 8

What is a pixel?

Answer 8

The smallest unit of a digital image that can be displayed on a computer screen.

Question 9

What does Image Resolution do?

Answer 9

Tells us the quality of an image the more pixels the higher the quality and sharpness of the picture.

Question 10

What is a Bitmap?

Answer 10

An image made up of individual bits where each bit represents one pixel.

Question 11

What is a Vector?

Answer 11

An image that is completely described using mathematical definitions.

Question 12

JPEG

Answer 12

Joint Photographic Experts Group

compressed image file.

Question 13

TIFF

Answer 13

Tagged Image File Format

Larger than JPEGs
Can be used between Apple and Microsoft

Question 14

PNG

Answer 14

Portable Network Graphics

Sharing graphics over the internet maintaining the quality.

Question 15

GIF

Answer 15

Graphics Interchange Format

Usually small in size
sometimes animated

Question 16

TXT

Answer 16

Text file

Plain document with no formatting
Can be opened by any word processor

Question 17

CSV

Answer 17

Comma Separated Value

Used by data bases

Question 18

RTF

Answer 18

Rich Text File

Basic formatting
Scanners store in this type

Question 19

What does MP3 do?

Answer 19

Compresses audio but keeps quality

Question 20

What does MP4 do?

Answer 20

Compresses sound and video
Allows streaming over the internet

Question 21

MIDI

Answer 21

Musical Instrument Digital Interface

Allows sound samples to be interchanged between digital musical instruments.

Question 22

MPEG

Answer 22

Moving Pictures Expert Group

Digital video files

Question 23

AVI

Answer 23

Audio Video Interleaved

Question 24

PDF

Answer 24

Portable Document Format

Documents that are read only and small

Question 25

WAV

Answer 25

Windows Audio waVeform Audios for PC

Question 26

WMA

Answer 26

Windows Media Audio Used for windows media player audio files

Question 27

Why do we need Compression?

Answer 27

Data needs to be compressed to make files easier to send or store.

Question 28

What is Lossy Compression?

Answer 28

Reduces the file size by removing data such as taking colours out of photo