Unit1-multimedia

Question 1

Sampling rate

Answer 1

The amount of samples taken per second

Sound sampling done @ 44 kHz

Question 2

Bit depth

Answer 2

The amount of bits that make up the smallest units in a picture/sound file

Question 3

Define lossy compression

Answer 3

When unnecessary data is PERMANENTLY deleted, e.g. JPEG and MP3 files

Question 4

Sampling resolution

Answer 4

The amount of bits used in the audio file (bigger value=more accurate) PER SAMPLE !!!!

Question 5

Define frame rate

Answer 5

The number of of frames recorded on a video per second

General compression method

Question 6

Define compression

Answer 6

Way of reducing a file to save storage/ reduce transfer time

Question 7

Define quality

Answer 7

Combo of resolution, colour depth and bit depth

Question 8

Define Analogue to Digital Converter (ADC)

Answer 8

Converts analogue data like sound to digital (binary) values

Question 9

Define lossless compression

Answer 9

When the original file is re-organised when you open it back up

Question 10

Run Length Encoding (RLE)

Answer 10

Lossy compression that reduces similar data items, especially with text and photo files

Question 11

Define character set

Answer 11

Characters defined by hard/software to be used in a given code, e.g. the character set of ASCII and extended ASCII

Question 12

Define clipping

Answer 12

When the sound values are cut off at the maximum values-makes a ‘clipping’ sound

Question 13

Define colour depth

Answer 13

The possible amounts of colours a pixel can have (256 for an 8-bit code)

Question 14

Pixel density

Answer 14

The number of pixels per square inch

Question 15

Define amplitude

Answer 15

Loudness

Question 16

Define metadata

Answer 16

Data about data in the file header
File size/type
Image resolution 
Bit depth
Data on data compression

Question 17

What’s the difference between ASCII and extended ASCII?

Answer 17

ASCII uses 7 bits

Extended ASCII uses 8

Question 18

What’s the storage difference between ASCII and Unicode?

Answer 18

ASCII uses 1 byte per character

Unicode uses 4 bytes per character

Question 19

What’s image resolution?

Answer 19

Size of image pixels

Height x width

Question 20

What’s screen resolution?

Answer 20

Size of screen pixel

Height x width

Question 21

What’s sampling?

Answer 21

Recording analogous media files, I.e. amplitude of sound waves @ regular points in time