
1-14
Introduction
Final Rev F
Copyright 1996 by LSI Logic Corporation. All rights reserved.
Codec. Coder/decoder.
Composite Signal. Single signal that encodes the luminance and
chrominance signals.
Component Signal. Signal which contains either the luminance or the
chrominance component.
DCT. Discrete Cosine Transform. A DCT converts data from the time
(spatial) into the frequency domain.
DIS. Draft International Standard.
DPCM. Differential Pulse Code Modulation. This type of modulation
transmits only the differences between two values.
DVI. Digital Video Interactive.
Entropy Coding. An efcient coding method that encodes frequent
events with fewer bits than it does with infrequent events.
FDCT. Forward DCT, the usual form of DCT.
Field. A eld is the complete set of the even or the odd scan lines. In
television, a single frame consists of two elds containing the odd and
even scan lines, respectively.
fps. Frames per second.
Frame. In motion video, a single image. Frames can be presented at 25
frames per second (PAL standard) or at 30 frames per second (NTSC
standard).
Genlocking. Synchronizing signals to an external video source.
HDTV. High Denition TV (for example, 1125 or 1250 lines).
Huffman Coding. A static set of minimum redundancy, integral-length bit
strings. Huffman coding is a type of entropy coding that uses predeter-
mined variable-length codewords.
IDCT. Inverse DCT. An IDCT converts data from the frequency domain
into the time (spatial) domain.
IEC. International Electrotechnical Commission.