HOLOPHONE H4 SuperMINI User Manual - page 11
H4-SuperMINI User Guide
Rising Sun Productions Ltd.
page 7
Dolby Surround, Dolby ProLogic: 4-2-4
Dolby Surround and Dolby ProLogic are home cinema versions of
Dolby Stereo. For television home video, the four signals are
compressed into two conventional stereo tracks, and then
decompressed into four if the home equipment supports surround
sound. This compression is referred to as 4-2-4.
Dolby Digital: 5.1 configuration
Today, surround sound in theaters is delivered most commonly by
Dolby Digital systems, including Dolby Digital 5.1, Dolby AC-3
and Dolby SR-D (Spectral Recording Digital). Dolby Digital
employs six sound sources, as follows:
•
Center
•
Left
•
Right
•
Left surround
•
Right surround
•
LFE (or Low Frequency Effects)
This configuration is known as 5.1, with the “.1” referring to the
LFE source (also known as a subwoofer). Dolby Surround Digital
is the home video version, available on digital video disks
(DVDs).
Other 5.1 Systems
A competing system called DTS (Digital Theater Systems),
introduced with Jurassic Park, also uses the 5.1 configuration.
Circle Surround analog decoding system also supports 5.1.
All models of the Holophone (H2-PRO, H3-D, H4 SuperMINI)
support 5.1 surround systems.
Dolby ProLogic II: Encoded 5.1
Dolby ProLogic II is an advanced implementation of Dolby Pro
Logic that processes any high quality stereo signal into 5.1
surround sound. (It can also decode 5.1 channels from 4-channel
Dolby Surround.)
The Holophone H4 SuperMINI takes advantage of Dolby
ProLogic II encoding (or any other stereo media) to create stereo
signals that can be stored on a video camera, and decoded later
for 5.1 stereo sound. (The H4 SuperMINI can also deliver 5.1
channels without encoding, to be stored or delivered directly.)
5.1 configuration