Multimedia Systems Flashcards
Amplitude
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.
Animation
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.
Application software
Used to generate specific content such as sound, images, text. Eg Word, Keynote
Audio
Reproduction of sound, soted in either analog or digital format. Egs, MIDI, MP3, Waveform(.wav) and AIFF.
Authoring software
Allows the generation and design of a complete multimedia solution in a single package, utilises external media elements, eg Adobe Captivate, Articulate 360
Bit depth
Refers to the number of bits describing each pixel. A 16-bit image would produce 65,536 (216 )colours.
Bit mapping
The relationship between an image on screen and the image in RAM
Bitmap image
An image created from rows of different coloured pixels that together form an image. Also called raster images.
Codec
An algorithm used to compress data by removing redundant or repetitive elements from a file. Eg JPEG, PKZIP, MP3, GIF
Data integrity
Means the data is reliable- accurate, consistent and up-to-date
Digital convergence
Social issue: the increasing trend to merge technologies such as radio, TV, phone, etc into one.
Decompression
The process of reconstructing the initial data from a compressed data
Digitising
The process of converting an analog signal into a digital form stored as binary data
Frequency
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.
Hypertext
Text, when clicked, navigates user to another section of a multimedia system
Hypermedia
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.
Huffman compression
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
MIDI (musical instrument digital information interface)
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.
Morphing
The smooth transition from one image to another.
Multimedia
Presentation of information in a variety of forms and different media types, eg images, graphics, sound, text
Palette
The number of available colours for an image: determined by bit depth
Resolution
Describes the image quality or number of pixels in an image
Sampling rate
The number of samples or slices taken of an analog sound wave per second.CD audio quality uses a sample rate of 44.1KHz
Sample size
The number of bits used to store each sample size from the analog wave, eg an 8-bit sample can describe 256 (28 ) levels.
Speakers
Convert binary data into audible sound through a vibrating cone in the speaker
Storyboard
Series of sketches and notes that represent the important parts of a presentation. Forms include hierarchical, linear and non-linear.
Touch screen
Display device that has a matrix of infra-red beams, ultrasonic waves or electrically charged panels measure the location of each touch event.
Tweening
The in-between frames of an animation performed by the software program
Vector graphics
Use mathematical formulae to draw lines and curves that can be combined to create an image
Video
An animation sequence and its associated sound.
Virual world
An imaginary or parallel world where users can play the part of a character far removed from their own.
Web browsers and editors
Used to display and/or generate multimedia-based content. Browser examples include Safari, Chrome, Explorer. Editors include Dreamweaver, Brackets, Notepad
LED (Light Emitting Diode) screen
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.
LCD (Liquid Crystal Display) screen
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.
OLED (Organic Light Emitting Diode)
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.
