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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
Dolby Pro Logic decodes program material encoded in
Dolby Surround, and is built into virtually every home
theater audio system. Dolby Pro Logic reconstructs the
original four channels - left, center, right, and surround -
that were encoded onto the program material’s stereo
soundtracks.
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 than Dolby Digital, 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 2.0+Digital Out” are trademarks of Digital
Theater Systems, Inc.
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)/C
R(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.