AYRE DX-5DSD - Manual (Page 119)

Aspect Ratio The ratio of the video display’s width to its height.
The two common aspect ratios used for video
displays are 16:9 (1.78:1), also known as
“widescreen”, and 4:3 (1.33:1), also known as
“standard”.
ATSC The Advanced Television Systems Committee was
established in the USA to oversee the transition
from the original analog broadcast system to the
current digital high-definition broadcast system.
AVC AVC (Advanced Video Coding) is a video
compression algorithm used in the some Blu-ray
discs.
CRT The Cathode Ray Tube is the original analog
technology used in video displays. It is rarely used
today.
Composite An Interlaced analog video signal that combines
brightness (black-and-white) information together
with color information. Performance is reduced
compared to other transmission formats, as the two
video signals cannot be perfectly separated again as
required by the display device.
Compressed Audio To allow storage of more video information on a
DVD, the digital audio surround soundtrack is
typically compressed to take up less room. The
original PCM digital audio data is compressed by
discarding data that is deemed to be of less
importance. Various companies have developed
proprietary schemes for reducing the quantity of
audio data while attempting to minimize the
impact on sound quality. See also Dolby Digital,
DTS, and MPEG Audio
117