DVD glossary
3-2 Pulldown
The process of transferring 24 frames-per-second (fps) film to 30 fps video.
Every other film frame is held for 3 video fields resulting in a sequence of 3
fields, 2 fields, 3 fields, 2 fields, etc.
4:2:2
Ratio
The sampling ratio used in the D1 (CCIR 601) digital video signal. For every 4
samples of luminance there are 2 samples each of R-Y (Red minus Luminance) and
B-Y (Blue minus luminance).
5.1
Channel Surround Sound
Term used to describe a discrete six-channel surround sound, where the "5"
corresponds to the five full-frequency (20Hz - 20kHz) channels (left, right,
center, left surround, right surround) and the "1" refers to the Low-Frequency
Effects (LFE) channel. Also 5.1 is a shorthand notation for a movie that has
six-channel surround sound track. The number to the left of the dot is the
number of full range channels and the number to the right of the dot signifies
the presence of the dedicated subwoofer channel. A movie in 5.0 sound has five
full range channels and no subwoofer track; a movie in 2.0 sound can be
encoded in Dolby Surround or can just be stereo.
6.1
Channel Surround Sound
Dolby Digital & DTS Surround EX. Extension of 5.1 format. One more channel was
added - Rear Center or Back Surround.
7.1
Channel Surround Sound
Dolby Digital & DTS THX Surround EX. Further extension of 5.1 surround sound
format. Added in 6.1 Surround Rear Center channel was split into two channels
- Back/Rear Left and Right to improve precision of surround sound.
- 8-to-16
