D i g i t a l
s u r r o u n d
p r o c e s s i n g
3 9
DSP presets
Music on CD or radio
The following DSP presets add a surround dimension to stereo
recordings, such as on audio CDs or FM radio.
Music extracts the mono and surround components of the original
recording for the centre and surround speakers to give a spacious
open sound field.
Trifield* is similar to Music but generates a centre-front signal
that is completely integrated with the front stereo image, for a
more stable, accurate, and focused stereo image. The image width
is also adjustable.
Super produces a very good surround effect with many live
recordings.
PLIIx Music and Music Logic are recommended for use with
studio produced music, and provide different options for adjusting
the sound field.
Multichannel movie soundtracks on DVD
The following presets are designed for use with multichannel movie
soundtracks encoded using Dolby Digital, DTS, or AAC (on some
models). Typically these are labelled 5.1 because they provide five
full-range channels (three front and two rear) and one LFE (bass
effects) channel.
Cinema* and THX decode the soundtrack to render the original
six channels to your speaker layout. THX adds some additional
signal processing to match the sound to typical home listening
conditions.
PLIIx Mov6, PLIIx Mus6, THX Surround EX, THX Ultra2, and
THX Music create an additional pair of surround channels from
the 5.1 channel soundtrack and are available if you have four
surround speakers in your system. Use PLIIx Mus6 or THX Music
for music.
Multichannel music recordings on DVD-Audio
The following presets are recommended for music recordings
containing more than two channels:
Discrete* renders the source channels to your speaker layout with
the ultimate precision and transparency.
Ambisonics is especially designed for multichannel recordings on
DVD-Audio discs that use Ambisonic encoding.
Special presets for two-channel materials
Direct uses only the left and right speakers; compare this with the
effect of surround processing using the other modes. Stereo* will
use a subwoofer if it is present.
Ambisonics is specially designed for two-channel materials
that are UHJ Ambisonically encoded, such as certain audio CDs.
The encoded surround information is recovered and played back
using all the loudspeakers in your system. In addition it will give
impressive results with other two-channel material.
Two-channel movie soundtracks on DVD, video, and TV
Many movie soundtracks are Dolby Surround Encoded onto a two-
channel stereo soundtrack.
The following DSP presets re-create the surround components from
this type of material:
PLIIx Movie* is Dolby’s recommended choice for Dolby Surround
Encoded material, and PLIIx THX provides a variant of this better
suited to home listening.
TV Logic uses the same processing techniques as PLIIx Movie
but with adjustable steering to give better results with TV material.
* The G91, when directly driving a surround system, includes
Trifield, Discrete, Cinema, Stereo, and PLII Movie presets.
