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DSP presets
38
Logic DSP presets
The digital surround processor provides six DSP presets
specifically designed for reproducing stereo film soundtracks.
PLII Movie and PLII THX use the new Dolby Pro Logic II DSP
processing mode, and are the recommended choices for Dolby
Surround encoded material. Most films, and many TV
programmes and series, are encoded using Dolby Surround,
and it is increasingly being used to encode music.
Pro Logic, THX Cinema, and TV Logic are based on the original
Dolby Pro Logic DSP processing mode, and are also designed
for Dolby Surround encoded material.
The remaining Logic preset, Mono is designed for films with
mono soundtracks.
Pro Logic II
Dolby Pro Logic II is a new decoding mode designed for any
two-channel source, whether or not it is encoded for Dolby
Surround. It can also be used for two-channel Dolby Digital
sources
It re-creates 5.1-channel movie surround from the two-channel
source, using improved decoding techniques that preserve the
directness of the sound field, resulting in enhanced image
stability compared with standard Pro Logic decoding.
Meridians implementation of Pro Logic II was the first in the
world to receive Dolby approval, and uses proprietary code
based on 48-bit precision to give outstanding clarity.
PLII THX
The PLII THX DSP preset provides Pro Logic II decoding,
followed by additional signal processing refinements developed
by Lucasfilm Ltd. These are designed to provide a better match
between the sound of the movie theatre and a home cinema in
the following ways:
The front channels are re-equalised to correct for the higher
treble often found in film soundtracks.
The surround channels are frequency-corrected using a
timbre-matching process so that sounds moving frontback
are more convincing.
The surround channels are decorrelated to break up any
artificial localisation of the rear signals due to the speakers
being nearby. In the 568.2 Digital Surround Processor this
decorrelation is optimised to give spacious surround sound
that has no artefacts disturbing to music or other sensitive
sounds in the mix.
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