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Operation
Selection of a surround mode is based on
personal taste, as well as the type of pro-
gram source material being used. For
example, motion pictures or TV programs
bearing the logo of one of the major sur-
round encoding processes, such as Dolby
Surround, DTS
Stereo or UltraStereo
may be played in either the Dolby Digital,
Dolby Pro Logic or Movie Surround
depending on the source material.
23
MODE
DOLBY DIGITAL
DOLBY PRO LOGIC
DOLBY 3 STEREO
THEATER
HALL 1 and HALL 2
STEREO
FEATURES
This mode is available only when the source material is encoded with Dolby Digital
(AC-3) data. It provides up to five separate main audio channels and a special dedi-
cated Low-Frequency Effects channel.
Dolby Pro Logic is the standard mode for analog surround sound decoding. It uses
information encoded in a two-channel stereo recording to produce four distinct
channels: Left, Center, Right and Surround. Use this mode for accurate reproduction
of programs bearing the Dolby Surround, DTS Stereo, UltraStereo or other
“Surround” logos. Surround encoded programs include videocassette, DVD and LD
movies, TV and cable programs, radio programs and audio CDs. Dolby Pro Logic
processing may also be used to provide a pleasing surround effect with some
stereophonic source material that does not carry surround encoding.
Dolby 3 Stereo uses the information contained in a surround encoded or two-channel
stereo program to create center channel information. In addition, the information
that is normally sent to the rear channel surround speakers is carefully mixed in with
the front left and right channels for increased realism. Use this mode when you have a
center channel speaker, but no surround speakers.
Theater Surround processing uses matrix surround decoding to simulate a standard
movie or stage theater.
These modes are designed for use with stereo recordings. They provide a sound-field
effect that simulates the complex combination of direct and reflected sounds that
create the rich reverberant atmosphere of a medium-sized concert hall (Hall 1) or a
larger concert hall (Hall 2).
This mode turns off all surround processing and presents the pure left and right
channel presentation of two channel stereo programs.
DELAY TIME RANGE
Center: 0 ms –5 ms
Surround: 0 ms –15 ms
15 ms – 30 ms
Initial Setting = 20 ms
No Surround Channels
27.3 ms
Hall 1 – 41.6 ms
Hall 2 – 67.4 ms
No Surround Channels
Surround Mode Chart
NOTE: Once a program has been
encoded with surround information, it
retains the surround matrix as long as
the program is broadcast in stereo. Thus,
movies with surround sound will carry
surround information when they are
broadcast via conventional TV stations,
cable, pay TV and satellite transmission.
In addition, a growing number of made-
for-television programs, sports broad-
casts, radio dramas and music CDs are
also recorded in surround sound. You
may obtain a list of these programs and
discs from the Dolby Laboratories web
site at www.dolby.com
When a program is not listed as carrying
intentional surround information, you
may find that Pro Logic or Dolby 3-Stereo
modes often deliver enveloping surround
presentations through the use of the
natural information present in all stereo
recordings. However, for stereo, but non-
surround programs, we suggest that you
try the Hall 1, Hall 2 or Theater modes.
AVR45 om (G).Eng,Fr 4/16/99 11:41 AM Page 23
26


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