Dolby Digital
Dolby Digital provides multichannel surround sound in
cinemas from 35 mm film and in the home from laser discs,
DVDs, and digital broadcast television, cable, and satellite
systems. It enables the transmission and storage of up to
five full-range audio channels, plus a low-frequency effects
channel(LFE), thus 5.1 channels, in less space than is
required for just one linear PCM-coded channel on a
compact disc.
Dolby Pro Logic
Audio signal processing technology developed by Dolby
Laboratories for surround sound.
Dolby Pro Logic process outputs four channel(front left/right,
center, surround) signals.
The surround channel is monaural.
Manufactured under license from Dolby Laboratories.
“Dolby”, “Pro Logic”, and the double-D symbol are
trademarks of Dolby Laboratories.
DTS (Digital Theater Systems)
DTS is a newly-developed surround system which can
handle more amount of data, providing better audio quality.
Though the number of audio channels is 5.1 which is same
as Dolby Digital, discs bearing the provides fat
sound and better signal-to-noise ratio, thanks to the lower
audio compression ratio format. It also provides wide
dynamic range and better separation, resulting in
magnificent sound.
“DTS” and “DTS Digital Surround” are registered
trademarks of Digital Theater Systems, Inc.
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Interlaced scan
In the conventional video system, a picture is shown on the
screen in two halves. The interlaced scanning system places
lines of the second half of the picture in-between lines of the
first half of the picture.
Progressive scan
Progressive scanning displays all the horizontal lines of a
picture at one time, as a single frame.
Composite video
A single video signal commonly used in most consumer
video products that contains all luminance, color, and
synchronization information.
S-video
A video signal which improves picture quality over the
standard composite video signal.
Component video
Video signals with three channels of separate information
that makes up the picture. There are some types of
component video, such as Y/CB(Pb)/CR(Pr) and R/G/B.
Bitstream
The digital signal form of multichannel audio data (e.g., 5.1
channel) before it is decoded into its various channels.
Linear PCM
PCM stands for Pulse Code Modulation. Linear PCM is the
usual digital method without compression, used for audio
playback of audio CDs, DVD Videos, etc.