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Additional Information
Glossary
Surround sound
Sound that consists of three elements:
direct sound, early reflected sound
(early reflections) and reverberative
sound (reverberation). The acoustics
of the surrounding space affect the
way these three sound elements are
heard. Surround sound combines
these sound elements in such a way
that you actually can sense the size of
the venue, as well as its type.
• Types of sound
• Transition of sound from rear speakers
Dolby Pro Logic Surround
As one method of decoding Dolby
Surround, Dolby Pro Logic Surround
produces four channels from two-
channel sound. Compared with the
former Dolby Surround system,
Dolby Pro Logic Surround reproduces
left-to-right panning more naturally
and localizes sounds more precisely.
To take full advantage of Dolby Pro
Logic Surround, you should have one
pair of rear speakers and a center
speaker. The rear speakers output
monaural sound.
Dolby Digital (AC-3)
This sound format for movie theaters
is more advanced than Dolby Pro
Logic Surround. In this format, the
rear speakers output stereo sound
with an expanded frequency range
and a subwoofer channel for deep
bass is independently provided. This
format is also called “5.1” because the
subwoofer channel is counted as 0.1
channel (since it functions only when
a deep bass effect is needed). All six
channels in this format are recorded
separately to realize superior channel
separation. Furthermore, since all the
signals are processed digitally, less
signal degradation occurs. The name
“AC-3” comes from the fact that it is
the third audio coding method to be
developed by the Dolby Laboratories
Licensing Corporation.
Digital Cinema Sound
This is the generic name of the
surround sound produced by digital
signal processing technology
developed by Sony. Unlike previous
surround sound fields mainly
directed at the reproduction of music,
Digital Cinema Sound is designed
specifically for the enjoyment of
movies.
Reverberation
Direct sound
Early
reflections
Reverberation
Early reflection time
Early reflections
Direct sound
Time
Level