332 Pinnacle Studio 9
GOP: In MPEG compression the data stream is
first divided into “Groups Of Pictures” – sections of
several frames each. Each GOP contains three types of
frames: I-Frames, P-Frames (pictures) and B-Frames.
GOP size: The GOP size defines, how many I-Frames,
B-Frames and P-Frames are included in one GOP.
For example, current GOP sizes are 9 or 12.
Hardware codec: Compression method that uses
special hardware to create and play back compressed
digital video sequences. A hardware codec may offer
better encoding speed and image quality than a codec
implemented completely in software. Codec,
Software codec
Hi8: Improved version of Video8 using S-Video
recorded on metal particle or metal evaporated tape.
Because of higher luminance resolution and wider
bandwidth, the result is sharper pictures than Video8.
HiColor: For images, this normally means a 16-bit
(5-6-5) data type that can contain up to 65,536 colors.
TGA file formats support images of this type. Other
file formats require prior conversion of a HiColor
image into TrueColor. For displays, HiColor
normally refers to 15-bit (5-5-5) display adapters that
can display up to 32,768 colors. Bit
Huffman coding: Technique used in JPEG and
other data compression methods in which seldom
occurring values receive a long code, while frequently-
occurring values receive a short code.
IDE: “Integrated Device Electronics” – a hard-drive
interface that combines all drive control electronics on
the drive itself, rather than on the adapter connecting
the drive to the expansion bus.
