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Multimedia D to Z
Multimedia terms and meanings D to Z
Terms in this set (50)
patterns of on's/high-voltage (1's) and off's/low voltage (0's) that can be processed by a computer.
process of converting video or audio signals normally in waveform (analog), into 1's and 0's.
a camera used to take digital images of documents/transparencies to be projected on a screen using a data projector. This technology serves the purpose of, and will eventually replace, standard overhead projectors.
fiber optic cable
type of cable used to connect devices on a network. Made of plastic or glass fibers covered with an opaque sheath. Digital signals are sent via code pulses of light. These cables are fast, reliable, and have extremely wide bandwidth.
(IEEE-1394) serial interface technology that allows connection of devices at speeds up to 50 Mbytes/s. Used for devices such as video cameras so that they can feed real time video to a computer.
frames per second the number of picture images displayed per second, giving digital video the illusion of motion. Full-motion video, with no dropped frames, is considered 30 fps.
a single picture in a computerized "movie"/digital video.
number of images per second displayed in a stream of video.
full screen video
digital video filling the entire screen.
Graphic Interchange Format is a CompuServe's Graphics Interchange Format the industry standard for Web pages. GIF files support only 8-bit, or 256 colors.
High Definition Television. Large picture size (16-by-9 display ratio for HDTV versus 4-by-3 for regular TV) and more horizontal picture lines, HDTV will have a higher quality display than conventional TV. Also, HDTV has cd-quality sound and involves digital transmission instead of analog.
video conferencing using IP networking.
JPEG (Joint Photographic Experts Group) compressed, still-image graphics files. There are two major types of JPEG progressive, where a fuzzy images emerges into 100% decompression/clarity, and baseline or standard, where a clear image is revealed, part-wise, top-down. Progressive, or interleaved, decompression looks better over networks.
A signal level between -10dBu and +30dBu. CD players, VCRs, surround processors, and most recording devices are connected to a system at line level (before power amplification).
real-time continuous broadcast.
a colour's brightness.
The typical level of a microphone signal. Usually lower than -40 dBu.
(Motion Picture Experts Group) a developing standard for digital video compression used to send movie files for viewing on the World Wide Web. The MPEG file name extension is either .mpeg or .mpg.
the combined use of several media, such as high-quality graphics, animations, and sound.
videoconference allowing three or more participants to sit in a virtual conference room and communicate as if they were sitting right next to each other.
on demand feed
playback of a previously recorded session during which the viewer/listener can fast-forward, back up, or pause.
PICture ELements = Pixel. The tiny dots comprising a picture.
point to point videoconferencing
videoconference between two participants.
presentation graphics program
allow end-users to put together multimedia shows for presentations.
(MOV) A Cross-Platform real-time video and multimedia data format developed by Apple Computer. QuickTime files can include text, sound and video.
Also called "phono plug" or "RCA phono," cable connector for home audio as well as video components. Standard connection for direct audio/video inputs/outputs.
the clarity of the displayed/printed image. The more pixels/dots per square inch (dpi), the finer the detail (higher resolution).
an adapter card used to convert a computer digital signal to the analog signal needed as input in a TV. Used to display the computer image on a standard television set.
An add-in circuit board that once installed, enables the computer to accept audio input from a microphone, edit/trim/mix recordings, play sound files stored on disks or CD-ROM's, and produce audio output through speakers or earphones.
capability to begin playing media on the client side before it has fully downloaded from the server side
a phone meeting where callers can both see and hear each other.
(Tagged Image File Format) general purpose file for bitmapped graphics; developed by Aldus Corporation; in general it can handle any type image. Usually the .TIF documents are 24-bit graphics images.
Images composed of sets of graphical objects (lines, rectangles, ellipses, arcs, curves, etc.) stored by software as numerical coordinates and mathematical formulas specifying their shape and position in an image.
(video graphics array) VGA systems provide a resolution of 720 by 400 pixels. In graphics mode, the resolution is either 640 by 480 (with 16 colors) or 320 by 200 (with 256 colors). The total palette of colors is 262,144.
video capture card
adapter card which allows recording and digitalization of pictures for use with a computer. The pictures may be still-images or movies. Once captured, the picture data is compressed using a CODEC, with playback requiring CODEC-decompression.
single-signal video, used in VHS. Inferior to component video.
Used in Hi8 and SuperVHS cameras, component video splits the single composite video signal into colors (RGB) and improves the quality by adding a luminance or brightness (Y) channel and a color/chroma intensity (C) channel. Superior to composite video.
Digitized video, i.e. video converted/compressed to file format. Formats: .AVI (Video for Windows) and .MOV (QuickTime cross-platform for both Macintosh and Windows).
transporting real-time voice and video over telecommunications services.
WAVE file. The most common file format for Windows sounds.
using the Web to deliver live or delayed versions of sound or video broadcasts.
run length encoding compression is lossless compression. It is used for repeating patterns within binary data. Pattern occurs once and is reused in process of compression
looks for the most commonly occurring bit patterns with the data and replaces these with shorter symbols. This helps compress the file.
there are two factors that impact the accuracy and quality of audio samples - number of samples per second and number of bits used to represent each sample
vector images represent each portion of the image mathematically. there are no bits.
enhanced metafile format is a vector file format
liquid crystal display or flat panel display. Replaced RCT based monitors.
plasma screen uses ionised gas. composed of two dimensional grids of cells sandwiched between two sheets of glass. the grid includes alternating rows of red, green and blue cells. Each cell forms a pixel. each cell contains neon gas and is coated in coloured phosphors.
virtual reality headsets
add sensors to monitor the postion of the users head. this allows the images to move fluidly as the user looks around.
including a file within another. A source file is embedded so that it becomes part of the destination file.
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