Multimedia Systems

Question 1

Amplitude

Answer 1

Relates to the energy or strength of a sound wave and is thus a measure of the loudness of sound. Sampling size affects the amount of information stored about the amplitude of the sound wave.

Question 2

Animation

Answer 2

A series of images, or frames, are placed on the screen in quick succession. Based on the principle of persistence of vision of the human eye.

Question 3

Application software

Answer 3

Used to generate specific content such as sound, images, text. Eg Word, Keynote

Question 4

Audio

Answer 4

Reproduction of sound, soted in either analog or digital format. Egs, MIDI, MP3, Waveform(.wav) and AIFF.

Question 5

Authoring software

Answer 5

Allows the generation and design of a complete multimedia solution in a single package, utilises external media elements, eg Adobe Captivate, Articulate 360

Question 6

Bit depth

Answer 6

Refers to the number of bits describing each pixel. A 16-bit image would produce 65,536 (216 )colours.

Question 7

Bit mapping

Answer 7

The relationship between an image on screen and the image in RAM

Question 8

Bitmap image

Answer 8

An image created from rows of different coloured pixels that together form an image. Also called raster images.

Question 9

Codec

Answer 9

An algorithm used to compress data by removing redundant or repetitive elements from a file. Eg JPEG, PKZIP, MP3, GIF

Question 10

Data integrity

Answer 10

Means the data is reliable- accurate, consistent and up-to-date

Question 11

Digital convergence

Answer 11

Social issue: the increasing trend to merge technologies such as radio, TV, phone, etc into one.

Question 12

Decompression

Answer 12

The process of reconstructing the initial data from a compressed data

Question 13

Digitising

Answer 13

The process of converting an analog signal into a digital form stored as binary data

Question 14

Frequency

Answer 14

The number of cycles of a periodic motion, such as a sound wave, that pass in a given time. It is measured in Hertz, or a cycle per second.

Question 15

Hypertext

Answer 15

Text, when clicked, navigates user to another section of a multimedia system

Question 16

Hypermedia

Answer 16

The linking of data types. Any media object which can, when clicked, navigate the user to another section or component of the system, eg click on a thumbnail image and navigate to a larger version of the image.

Question 17

Huffman compression

Answer 17

Lossless data compression that assigns codes to characters such that the length of the code depends on the relative frequency or weight of the corresponding character

Question 18

MIDI (musical instrument digital information interface)

Answer 18

Used to input or output analog musical information from electronic musical instruments in digital format ready for use by a computer. Results in much smaller file size than .wav files.

Question 19

Morphing

Answer 19

The smooth transition from one image to another.

Question 20

Multimedia

Answer 20

Presentation of information in a variety of forms and different media types, eg images, graphics, sound, text

Question 21

Palette

Answer 21

The number of available colours for an image: determined by bit depth

Question 22

Resolution

Answer 22

Describes the image quality or number of pixels in an image

Question 23

Sampling rate

Answer 23

The number of samples or slices taken of an analog sound wave per second.CD audio quality uses a sample rate of 44.1KHz

Question 24

Sample size

Answer 24

The number of bits used to store each sample size from the analog wave, eg an 8-bit sample can describe 256 (28 ) levels.

Question 25

Speakers

Answer 25

Convert binary data into audible sound through a vibrating cone in the speaker

Question 26

Storyboard

Answer 26

Series of sketches and notes that represent the important parts of a presentation. Forms include hierarchical, linear and non-linear.

Question 27

Touch screen

Answer 27

Display device that has a matrix of infra-red beams, ultrasonic waves or electrically charged panels measure the location of each touch event.

Question 28

Tweening

Answer 28

The in-between frames of an animation performed by the software program

Question 29

Vector graphics

Answer 29

Use mathematical formulae to draw lines and curves that can be combined to create an image

Question 30

Video

Answer 30

An animation sequence and its associated sound.

Question 31

Virual world

Answer 31

An imaginary or parallel world where users can play the part of a character far removed from their own.

Question 32

Web browsers and editors

Answer 32

Used to display and/or generate multimedia-based content. Browser examples include Safari, Chrome, Explorer. Editors include Dreamweaver, Brackets, Notepad

Question 33

LED (Light Emitting Diode) screen

Answer 33

Backlit LEDs have a full array of LED’s behind the screen, and the backlight creates the light that passes through liquid crystals. Edge-lit screens have the LED’s at the edges of the screen.

Question 34

LCD (Liquid Crystal Display) screen

Answer 34

Large fluorescent lamps behind the screen shone through a matrix of coloured LCD cells. An older technology now, hence why it is cheaper, then the newer LED and OLED technologies.

Question 35

OLED (Organic Light Emitting Diode)

Answer 35

Newer screen technology that produces light and colour from a single diode when they are fed electricity. They don’t need a separate backlight. Each pixel is a self-contained source of colour and light.