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corporate
training video, digital, marketing, promotional, training video
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Analogue
The representation of numerical values by physical variables
such as voltage, current, etc.
Analogue-to-digital converter
An electronic device that converts analogue signals to digital
form
Aspect ratio
The measurement of a film or television viewing area in terms
of relative height and width.
Backward compatibility
The ability of a new coding standard to be handled by existing
decoders
Bandwidth
The range of signal frequencies that a piece of audio or video
equipment can encode or deco
Bitrate
The rate at which a storage medium delivers a compressed bitstream
to a decoder's input (see bitrate)
Broadcast quality
In the US, a standard of 525 lines of video picture information
at a rate of 60 Hz. See NTSC format. In the UK, a standard of
625 lines, of video picture information at a rate of 50 Hz
Compression ratio
The size of the original image divided by the size of the compressed
image, measuring the degree to which a compression routine can
reduce the size of a file.
D/A (digital to analogue)
The conversion of digital signals to analogue form.
D/A converter (DAC)
Device that converts digital signals to analogue form
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Decoding
A process that converts an input coded bitstream into pictures
or audio samples
Encryption
A procedure for encoding data that makes it difficult to decode
the data without proprietary software of hardware. This procedure
protects data or software from unauthorized access or use.
Digital video
A video represented by computer-readable binary numbers that
describe a finite set of colors and luminance levels. See analogue
video
Forward compatibility
The ability of a coding standard that works with existing decoders
to work with new decoders
Frame
A single, complete picture in a video or film recording.
Frame rate
The speed at which video frames are scanned or displayed --
30 frames a second for NTSC, 25 frames per second for PAL/SECAM.
Hertz (Hz)
The standard unit of frequency. One Hz equals one cycle (or
vibration) per second. One kilohertz (KHz) equals 1,000 cycles
per second, and one megahertz (MHz) equals 1,000,000 cycles
per second. This standard unit is named after German physicist
Heinrich Hertz (1857-1894).
MPEG (Motion Picture Experts Group)
A working committee which, under the auspices of the International
Standards Organization, has defined standards for the digital
compression and decompression of motion video/audio for use
in computer systems. (see About MPEGs)
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NAB
National Association of Broadcasters
NTSC
National Television Systems Committee of the Electronics Industries
Association (EAI) which prepared the NTSC format specifications
approved by the Federal Communications Commission, in December
1953, for US commercial color broadcasting
NTSC format
A color television format having 525 scan lines, a field frequency
of 60 Hz, a broadcast bandwidth of 4 MHz, line frequency of
15.75 KHz, frame frequency of 1/30 of a second, and a color
subcarrier frequency of 3.58 MHz.
PAL format
Phase Alternation Line; the European standard color television
system, except for France. PAL's image format is 4:3, 625 lines,
50 Hz and 4-MHz video bandwidth with a total 8 MHz of video
channel width.
Parameter
A variable that may take one of many values
Post-production
The stage in the preparation of a film or video program after
the original footage has been shot.
Pre-production
All design tasks (flow-charting, story-boarding, script-writing,
software design, etc.) that lead up to the actual shooting of
material on video or film, or up to the authoring of multimedia
software.
Production
In video terms, the period when video or film footage is actually
shot. See also pre-production, post-production.
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Real time
The actual time in which a program or event takes place. In
computing, real time refers to an operating mode under which
data is received and processed and the results returned so quickly
that the process appears instantaneous to the user
Video
A system of recording and transmitting primarily visual information
by translating moving or still images into electrical signal
Video CD
A full-motion digital video format using MPEG video compression
and incorporating a variety of VCR-like control capabilities
Video sequence
A series of one or more pictures.
White Book
A standard specification developed by Philips and JVC in 1993
for storing MPEG standard video on CD.
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