Chapter 6: Dolby Pro Logic Surround; What Is Dolby Pro Logic Surround - Sony LBT-D670AV Operating Instructions Manual

Chapter 6:
Dolby Pro
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What is Dolby Pro Logic
Surround
Connecting Optional Video
Equipment
Enjoying Dolby Pro Logic
Surround Effects
What is Dolby Pro
Logic Surround
New Dolby Surround standard
Dolby Surround is basically a home theater
audio system. Dolby Pro Logic Surround is
a new standard from Dolby Laboratories
Licensing Corporation. It improves sound
image by using four separate channels: off-
screen audio effects, on-screen dialogue,
left-to right panning, and music.
As a result, sound imaging has greatly
improved directional accuracy, especially in
the case of movie sound effects. You can
feel as if you were in the scene. The Dolby
Pro Logic Surround can be set to one of
three modes depending on the arrangement
of your speaker system: NORMAL,
PHANTOM, and 3CH LOGIC. The low
bass sound will come out from the left and
right front speakers.
We thank Dolby Laboratories Licensing
Corporation for its unique directionality
emphasis circuitry.
Before enjoying Dolby Pro Logic Surround
effect, you need to connect video
equipment (VCR, TV, etc.) to your stereo
system.
What is Pro Logic
Pro Logic is a form of playback system. It
uses professional decoder technology for
movie creators to recreate the sound field of
a two-channel Dolby Surround signal.
Dolby Pro Logic Surround
Modes
You can select one of the following three
modes, depending on the arrangement of
your speaker system.
After deciding the Pro Logic mode, select
the same one in "Adjusting the Sound
Level."
NORMAL mode
Select this mode when using rear speakers
and a small center speaker such as those
provided with this system.
Since a small speaker cannot reproduce a
full bass sound, the low bass sound on the
center channel is output through the left
and right front speakers.
Center
Front Front
speaker
speaker (L) speaker (R)
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Rear Rear
speaker (L) speaker (R)
PHANTOM mode
Select this mode when you are not using a
center speaker. The sound for the center
channel is output from the left and right
front speakers.
Front Front
speaker (L) speaker (R)
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Rear Rear
speaker (L) speaker (R)
3CH (channel) LOGIC mode
Select this mode when using only front and
center speakers. The sound for the rear
channel is output through the left and right
front speakers. You may want to use this
mode when listening to non-Dolby
Surround sources (such as a synthesized
TV "stereo" or music recordings with vocal
solos) even if you have rear speakers.
Front sellin Front
speaker (L) SPE4KET speaker (R)
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Chapter 6: Dolby Pro Logic Surround 23