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User’s Guide CineMaster 43
Appendix C
Glossary
AC-3 (Dolby Digital) –
A Dolby Laboratories specification for digital audio.
An AC-3 stream contains 5.1 channels of digital audio (full 44.1 kHz, 16-bit
digital channels for left, right, center, left surround, right surround, and an
additional low bit rate channel for subwoofer information). AC-3 data is
normally transferred digitally from a coaxial or optical S/PDIF output
connector to an AC-3 decoder or amplifier for playback.
Angle Control –
Angle control allows the user playing a DVD title to select
which scene is displayed when the DVD content contains multiple angles. This
multiple angle content is unique to DVD because previous compression
standards did not support the simultaneous compression of more than one
video sequence. Multiple angles are a result of filming the original production
with more than one camera, and they can be used to assemble “different”
versions of the same movie, such as a “Director’s Cut.”
Aspect Ratio –
The relationship between the width and height of a video frame
(or of a pixel making up a video frame).
4:3
is the standard for NTSC (and
therefore televisions in the U.S., which are only somewhat wider than they are
high).
16:9
, also called “letterbox” is the format used in movie theaters, where
the screen is 16-ninths (178%) wider than it is high. Many non-U.S.
televisions are built to display this format.