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APPENDIX A
SP3 SURROUND MODES
Pressing the SURROUND left () and right ()arrow
buttons button will allow you to sequentially select
one of the many available decoding modes for expand
almost any 2 channel music source signals. The custom
SP3 Surround Modes use a set of DSP algorithms to cre-
ate a set of simulated surround sound signals from the
original left and right 2 channel data.
CLUB: This Sound Field Mode is intended to simu-
late being fairly close, around 10 feet away, in a small
intimate club setting with a moderate amount of rever-
beration that does not destroy clarity. The result is a bit
colored for speech due to the small room size, but it is
quite suitable for jazz groups, cabaret, small-venue rock
'n roll, and a small disco venue where dance music is
played. This mode can also be used for classical cham-
ber music and solo instrumental music of most kinds.
NATURAL: PL
Natural mode enhances the basic
II
stereo reproduction by using the inherent acoustics
recorded within the source material. If the source mate-
rial was surround encoded or recorded in an acousti-
cally oriented manner (such as a lot of classical music
and many live recordings) this mode can provide truly
spectacular effects and an enhanced sense of the space
in which the music was being performed.
PARTY: The Party (Seven-Channel Mono) Mode con-
verts stereo input to a mono signal which is then distrib-
uted to the five satellite channels.
STEREO7: The Stereo7 (Seven-Channel Stereo) Mode
converts stereo input to surround sound. The stereo
signal is distributed to the 7 satellite channels, creating
a giant stereo image in your
listening space.
PRO LOGIC: Dolby Surround/Pro Logic is based on
basic matrix technology. When a Dolby Surround
soundtrack is created, four channels of sound are
matrix-encoded into an ordinary stereo (two channel)
sound track. The centre channel is encoded by plac-
ing it equally in the left and right channels; the rear
channel is encoded using phase shift techniques. A
Pro Logic decoder/processor "unfolds" the sound into
the original 4.0 surround—left and right, centre, and
a single limited frequency-range mono rear channel
using 'Steering Logic', which drives amplifiers, to raise
or lower the output volume of each channel based on
the current dominant sound direction. In addition the
surround channel is slightly delayed, so that any front
channel sounds that leak into the surround channel
arrive at the listener after the front channels, providing
an illusion of greater separation.
MUSIC: This mode can enhance normal stereo
PL
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music recordings, offering a wider soundstage and
enhanced spatial effects. This offers user control over:
MOVIE: This is the preferred decoding method
PL
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for watching movies with matrix surround encoding.
The centre width and dimension variables are set and
optimized for this application, and cannot be adjusted.
No filters are present on the surround channels, and
auto-balance is operational.
NEO:6 MUSIC: Neo:6 derives a centre channel from
two-channel material. Neo:6 music mode to expands
stereo non-matrix recordings into the five- or six-chan-
nel layout, in a way which does not diminish the subtlety
and integrity of the original stereo recording.
In music mode, the intent in the front channels is less
one of steering and more one of stabilizing the front
image by augmenting it with a centre channel, while
preserving the original perspective of the stereo mix.
Therefore the derived centre is never fully subtracted
from the left and right channels.
NEO:6 CINEMA: In cinema mode, for Left/Right film
soundtracks, sounds steered to the centre are subtract-
ed from the left and right channels. Neo 6 provides
up to six full-band channels of matrix decoding from
stereo matrix material. Users with 6.1 and 5.1 systems
will derive six and five separate channels respectively,
corresponding to the standard home-theater speaker
layouts. (The ".1" subwoofer channel is generated by
bass management in the preamp or receiver.)
(Please note that the apparent effect of the Surround Modes can
be adjusted by altering the delay parameters and channel volume
of the centre, surrounds and back channel(s), using the appropri-
ate menus).
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